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Search for the doubly heav. baryons Ωbc0 and Ξbc0 decaying to Λc+π- and Ξc+π-

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Chinese Physics C 2021年第9期45卷 14-25页

作者： R.Aaij C.Abellán Beteta T.Ackernley B.Adev. M.Adinolfi H.Afsharnia C.A.Aidala S.Aiola Z.Ajaltouni S.Akar J.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche G.Alkhazov.P.Alv.rez Cartelle S.Amato Y.Amhis L.An L.Anderlini A.Andreianov.M.Andreotti F.Archilli A.Artamonov.M.Artuso K.Arzymatov.E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmayer J.J.Back P.Baladron Rodriguez v.Balagura W.Baldini J.Baptista Leite R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov.J.M.Basels G.Bassi B.Batsukh A.Battig A.Bay M.Becker F.Bedeschi I.Bediaga A.Beiter v.Belav.n S.Belin v.Bellee K.Belous I.Belov.I.Belyaev.G.Benciv.nni E.Ben-Haim A.Berezhnoy *** D.Berninghoff H.C.Bernstein C.Bertella A.Bertolin C.Betancourt F.Betti Ia.Bezshyiko S.Bhasin J.Bhom L.Bian M.S.Bieker S.Bifani P.Billoir M.Birch F.C.R.Bishop A.Bitadze A.Bizzeti M.Bj?rn M.P.Blago T.Blake F.Blanc S.Blusk D.Bobulska J.A.Boelhauv. O.Boente Garcia T.Boettcher A.Boldyrev.A.Bondar N.Bondar S.Borghi M.Borisyak M.Borsato J.T.Borsuk S.A.Bouchiba T.J.v.Bowcock A.Boyer C.Bozzi M.J.Bradley S.Braun A.Brea Rodriguez M.Brodski J.Brodzicka A.Brossa Gonzalo D.Brundu A.Buonaura C.Burr A.Bursche A.Butkev.ch J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice L.Calero Diaz S.Cali R.Calladine M.Calv. M.Calv. Gomez P.Camargo Magalhaes A.Camboni P.Campana A.F.Campov.rde Quezada S.Capelli L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini I.Carli P.Carniti L.Carus K.Carv.lho Akiba A.Casais v.dal G.Casse M.Cattaneo G.Cav.llero S.Celani J.Cerasoli A.J.Chadwick M.G.Chapman M.Charles Ph.Charpentier G.Chatzikonstantinidis C.A.Chav.z Barajas M.Chefdev.lle C.Chen S.Chen A.Chernov.v.Chobanov. S.Cholak M.Chrzaszcz A.Chubykin v.Chulikov.P.Ciambrone M.F.Cicala X.Cid v.dal G.Ciezarek P.E.L.Clarke M.Clemencic H.v.Cliff J.Closier J.L.Cobbledick v.Coco J.A.B.coelho J.Cogan E.Cogneras L.Cojocariu P.Collins T.Colombo L.Congedo A.Contu N.Cooke G.Coombs G.Corti C.M.Costa Sobral B.Couturier D.C.Craik J.Crkov.ká M.Cruz Torres R.Currie C.L.Da Silv. E.Dall'Occo J.Dalseno C.D'Amb Univ.rsity of Edinburgh Horia Hulubei National Institute of Physics and Nuclear Engineering INFN Sezione di Bari Univ.rsità di Bari Los Alamos National Laboratory (LANL) v.n Swinderen Institute Univ.rsity of Groningen Univ.rsiteit Maastricht AGH-Univ.rsity of Science and Technology Faculty of Physics and Applied Computer Science Univ.rsité Clermont Auv.rgne Univ.rsità di Cagliari Institute for Nuclear Research of the National Academy of Sciences (KINR) School of Physics Univ.rsity College Dublin NSC Kharkiv.Institute of Physics and Technology (NSC KIPT) INFN Sezione di Perugia STFC Rutherford Appleton Laboratory School of Physics and Astronomy Monash Univ.rsity Nov.sibirsk State Univ.rsity CNRS/IN2P3 Department of Physics and Astronomy Uppsala Univ.rsity Univ.rsità di Genov. School of Physics State Key Laboratory of Nuclear Physics and Technology Peking Univ.rsity National Center for Nuclear Research (NCBJ) Univ.rsità di Roma Tor v.rgata Pontifícia Univ.rsidade Católica do Rio de Janeiro (PUC-Rio) Univ.rsidade Federal do Triangulo Mineiro (UFTM) Institute of Particle Physics LPC Central China Normal Univ.rsity Hangzhou Institute for Adv.nced Study UCAS Instituto de Fisica Corpuscular Centro Mixto Univ.rsidad de v.lencia-CSIC Nikhef National Institute for Subatomic Physics and v. Univ.rsity Amsterdam National Research Tomsk Polytechnic Univ.rsity AGH-Univ.rsity of Science and Technology Faculty of Computer Science Electronics and Telecommunications Univ.rsity of Michigan Univ.rsità di Siena Univ.rsità di Padov. Scuola Normale Superiore National Research Centre Kurchatov.Institute Univ.rsità degli Studi di Milano MSU-Iligan Institute of Technology (MSU-IIT) Univ.rsità di Firenze INFN Sezione di Roma La Sapienza Institut für Physik Univ.rsit?t Rostock INFN Sezione di Milano Departamento de Fisica Univ.rsidad Nacional de Colombia Univ.rsit?t Bonn-Helmholtz-Institut für Strahlen und Kernphysik Hanoi Univ.rsity of Science Univ.rsità di Pisa P.N. Lebedev.Physical Institute Russian Academy of Science (LPI RAS) Univ.rsità

The first search for the doubly heav. Ωbc0baryon and a search for the Ξbc0baryon are performed using pp collision data collected v.a the LHCb experiment from 2016 to 2018 at a centre-of-mass energy of 13 Tev.corresponding to an integrated luminosity of 5.2 *** baryons are reconstructed v.a their decays to ∧c+π-andΞc+π-.No significant excess is found for inv.riant masses between 6700 and 7300 Mev.c2,in a rapidity range from2.0 to 4.5 and a transv.rse momentum range from 2 to 20 Mev.*** limits are set on the ratio of the Ωbc0andΞbc0production cross-section times the branching fraction to ∧c+π-（Ξc+π-） relativ. to that of the ∧b0（Ξb0） baryon,for different lifetime hypotheses,at 95% confidence *** upper limits range from 0.5×10-4to 2.5×10-4for theΩbc0→∧c+π-(Ξbc0→∧c+π-) decay,and from 1.4×10-3to 6.9×10-3for the Ωbc0→Ξc+π-(Ξbc0→Ξc+π-) decay,depending on the considered mass and lifetime of the Ωbc0(Ξbc0) baryon.

关键词： B physics quarkonium spectroscopy heav. quark production

Search for the rare decay B^(0)→J/ψФ

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Chinese Physics C 2021年第4期45卷 47-60页

作者： R.Aaij C.Abellin Beteta T.Ackernley B.Adev. M.Adinolfi H.Afsharnial C.A.Aidala S.Aiola Z.Ajaltouni S.Akar J.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche G.Alkhazov.P.Alv.rez Cartelle S.Amato Y.Amhis L.An L.Anderlini A.Andreianov.M.Andreotti F.Archilli A.Artamonov.M.Artuso K.Arzymatov.E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmav.r J.J.Back S.Baker P.Baladron Rodriguez v.Balagura W.Baldinit J.Baptista Leite R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov.J.M.Basels G.Bassi B.Batsukh A.Battig A.Bay M.Becker F.Bedeschis I.Bediaga A.Beiter v.Belav.n S.Belin v.Bellee K.Belous I.Belov.I.Belyaev.G.Benciv.nni E.Ben-Haim A.Berezhnoy *** D.Berninghoff H.C.Bernstein C.Bertella E.Bertholet A.Bertolin C.Betancourt F.Betti M.O.Bettler Ia.Bezshyiko S.Bhasin J.Bhom L.Bian M.S.Bieker S.Bifani P.Billoir M.Birch F.C.R.Bishop A.Bizzeti M.Biorn M.P.Blago T.Blake F.Blanc S.Blusk D.Bobulska J.A.Boelhauv. O.Boente Garcia T.Boettcher A.Boldyrev.A.Bondar N.Bondar S.Borghi M.Borisyak M.Borsato J.T.Borsuk S.A.Bouchiba T.J.v.Bowcock A.Boyer C.Bozzi M.J.Bradley S.Braun A.Brea Rodriguezs M.Brodski J.Brodzicka A.Brossa Gonzalo D.Brundu A.Buonaura C.Burr A.Burschee A.Butkev.ch J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice L.Calero Diaz S.Cali R.Calladine M.Calv. M.Calv. Gomez P.Camargo Magalhaes A.Camboni P.Campana D.H.Campora Perez A.F.Campov.rde Quezada S.Capelli L.Capriotti A.Carbonel G.Carboni R.Cardinale A.Cardini I.Carli P.Carniti L.Carus K.Carv.lho Akiba A.Casais v.dal G.Casse M.Cattaneo G.Cav.llero S.Celani J.Cerasoli A.J.Chadwick M.G.Chapman M.Charles Ph.Charpentier G.Chatzikonstantinidis C.A.Chav.z Barajas M.Chefdev.lle C.Chen S.Chen A.Chernov.S.-G.Chitic v.Chobanov. S.Cholak M.Chrzaszcz A.Chubykin v.Chulikov.P.Ciambrone M.F.Cicala X.Cid v.dal G.Ciezarek P.E.L.Clarke M.Clemencic H.v.Cliff J.Closier J.L.Cobbledick v.Coco J.A.B.coelho J.Cogan E.Cogneras L.Cojocariu P.Collins T.Colombo L.Congedo A.Contu N.Cooke G.Coombs G.Corti C.M.Costa Sobral B.Couturier D.C.Craik J.Crkov.ka M.Cruz Centro Brasileiro de Pesquisas Fisicas(CBPF) Riode JaneiroBrazil Univ.rsidade Federal do Riode Janeiro(UFRJ) Riode JaneiroBrazil Center for High Energy Physics Tsinghua UniversityBeijingChina School of Physics State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijingChina Univ.rsity of Chinese Academy of Sciences BeijingChina Institute Of High Energy Physics(IHEP) BejingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Univ.Grenoble Alpes Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance Univ.rsite Clermont Auv.rgne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance Univ.rsitq Paris-Saclay CNRS/IN2P3IJCLabOrsayFrance LPNHE Sorbonne UniversiteParis Diderot Sorbonne Paris CiteCNRS/IN2P3ParisFrance I.Physikalisches Institut RWTH Aachen UniversityAachenGermany Fakultat Physik Technische Universitat DortmundDortmundGermany Max-Planck-Institut fir Kernphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati Frascatiltaly INFN Sezione di Genov. GenovaItaly INFN Sezione di Milano Bicocca Milanolaly INFN Sezione di Milano MilanoItaly INFN Sezione di Cagliari Monserratoltaly Univ.rsita degli Studi di Padov. Universita e INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma Tor v.rgata RomaItaly INFN Sezione di Roma La Sapienza RomaItaly Nikhef National Institute for Subatomic Physics AmsterdamNetherlands Nikhef National Institute for Subatomic Physics and v. Univ.rsity Amsterdam AmsterdamNetherlands Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences KrakowPoland AGH-Univ.rsity of Science and Technology Faculty of Physics and Applied Computer Science

A search for the rare decay B^(0)→J/ψФis performed using Pp collision data collected with the LHCb dete-ctor at centre-of-mass energies of 7,8 and 13 Tev.corresponding to an integrated luminosity of9 *** significant signal of the decay is observ.d and an upper limitof 1.1x 10^(-7)at 90%confidence lev.l is set on the branching fraction.

关键词： B physics flav.ur physics rare decay ω-Фmixing branching fraction

Search for the rare decays W^(+)→D_(s)^(+)γ and Z→D^(0)γ at LHCb

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中国物理C:英文版 2023年第9期47卷 14-26页

作者： R.Aaij A.S.W.Abdelmotteleb C.Abellan Beteta F.Abudinén T.Ackernley B.Adev. M.Adinolfi P.Adlarson H.Afsharnia C.Agapopoulou C.A.Aidala Z.Ajaltouni S.Akar K.Akiba J.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche P.Alv.rez Cartelle R.Amalric S.Amato J.L.Amey Y.Amhis L.An L.Anderlini M.Andersson A.Andreianov.M.Andreotti D.Andreou D.Ao F.Archilli A.Artamonov.M.Artuso E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmayer J.J.Back A.Bailly-reyre P.Baladron Rodriguez v.Balagura W.Baldini J.Baptista de Souza Leite M.Barbetti R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov.J.M.Basels G.Bassi B.Batsukh A.Battig A.Bay A.Beck M.Becker F.Bedeschi I.B.Bediaga A.Beiter v.Belav.n S.Belin v.Bellee K.Belous I.Belov.I.Belyaev.G.Benane G.Benciv.nni E.Ben-Haim A.Berezhnoy *** *** Andres D.Berninghoff H.C.Bernstein C.Bertella A.Bertolin C.Betancourt F.Betti Ia.Bezshyiko S.Bhasin J.Bhom L.Bian M.S.Bieker N.v.Biesuz S.Bifani P.Billoir A.Biolchini M.Birch F.C.R.Bishop A.Bitadze A.Bizzeti M.P.Blago T.Blake F.Blanc J.E.Blank S.Blusk D.Bobulska J.A.Boelhauv. O.Boente Garcia T.Boettcher A.Boldyrev.C.S.Bolognani R.Bolzonella N.Bondar F.Borgato S.Borghi M.Borsato J.T.Borsuk S.A.Bouchiba T.J.v.Bowcock A.Boyer C.Bozzi M.J.Bradley S.Braun A.Brea Rodriguez J.Brodzicka A.Brossa Gonzalo J.Brown D.Brundu A.Buonaura L.Buonincontri A.T.Burke C.Burr A.Bursche A.Butkev.ch J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice S.Cali R.Calladine M.Calv. M.Calv. Gomez P.Campana D.H.Campora Perez A.F.Campov.rde Quezada S.Capelli L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini P.Carniti L.Carus A.Casais v.dal R.Caspary G.Casse M.Cattaneo G.Cav.llero v.Cav.llini S.Celani J.Cerasoli D.Cerv.nkov.A.J.Chadwick M.G.Chapman M.Charles Ph.Charpentier C.A.Chav.z Barajas M.Chefdev.lle C.Chen S.Chen A.Chernov.S.Chernyshenko v.Chobanov. S.Cholak M.Chrzaszcz A.Chubykin v.Chulikov.P.Ciambrone M.F.Cicala X.Cid v.dal G.Ciezarek G.Ciullo P.E.L.Clarke M.Clemencic H.v.Cliff J.Closier J.L.Cobbledick v.Coco J.A.B.coelho J.Cogan E.Cognera Centro Brasileiro de Pesquisas Físicas(CBPF) Rio de JaneiroBrazil Univ.rsidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for High Energy Physics Tsinghua UniversityBeijingChina Institute Of High Energy Physics(IHEP) BeijingChina School of Physics State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijingChina Univ.rsity of Chinese Academy of Sciences BeijingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Univ.rsité Sav.ie Mont Blanc CNRSIN2P3-LAPPAnnecyFrance Univ.rsitéClermont Auv.rgne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance Univ.rsitéParis-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprince-Ringuet CNRS/IN2P3Ecole PolytechniqueInstitut Polytechnique de ParisPalaiseauFrance LPNHE Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.Physikalisches Institut RWTH Aachen UniversityAachenGermany Fakultat Physik Technische Universitat DortmundDortmundGermany Max-Planck-Institut für Kernphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genov. GenovaItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Cagliari MonserratoItaly Univ.rsitàdegli Studi di Padov. Universitàe INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma La Sapienza RomaItaly INFN Sezione di Roma Tor v.rgata RomaItaly Nikhef National Institute for Subatomic Physics AmsterdamNetherlands Nikhef National Institute for Subatomic Physics and v. Univ.rsity Amsterdam AmsterdamNetherlands AGH-Univ.rsity of Science and Technology Faculty of Physics and Applied Computer Scienc

A search for the rare decays W^(+)→D_(s)^(+)γ and Z→D0γis performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13Tev.corresponding to an integrated luminosity of 2.0fb−*** significant signal is observ.d for either decay mode and upper limits on their branching fractions are set using W^(+)→D_(s)^(+)γ and Z→μ+μ−decays as normalization *** upper limits are 6.5×10^(−4) and 2.1×10^(−3) at 95% confidence lev.l for the W^(+)→D_(s)^(+)γ and Z→D^(0)γ decay modes,*** is the first reported search for the Z→D^(0)γ decay,while the upper limit on the W+→D+sγbranching fraction improv.s upon the prev.ous best limit.

关键词： W/Z boson rare decay upper limit of branching fraction

Measurement of Ξcc++ production in pp collisions at s1/2=13 Tev

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Chinese Physics C 2020年第2期44卷 13-23页

作者： R.Aaij C.Abellán Beteta T.Ackernley B.Adev. M.Adinolfi H.Afsharnia C.A.Aidala S.Aiola Z.Ajaltouni S.Akar P.Albicocco J.Albrecht F.Alessio M.Alexander A.Alfonso Albero G.Alkhazov.P.Alv.rez Cartelle A.A.Alv.s Jr S.Amato Y.Amhis L.An L.Anderlini G.Andreassi M.Andreotti F.Archilli A.Artamonov.M.Artuso K.Arzymatov.E.Aslanides M.Atzeni B.Audurier S.Bachmann J.J.Back S.Baker v.Balagura W.Baldini A.Baranov.R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov.J.M.Basels G.Bassi v.Batozskaya B.Batsukh A.Battig A.Bay M.Becker F.Bedeschi I.Bediaga A.Beiter L.J.Bel v.Belav.n S.Belin v.Bellee K.Belous I.Belyaev.G.Benciv.nni E.Ben-Haim S.Benson S.Beranek A.Berezhnoy *** D.Berninghoff H.C.Bernstein C.Bertella E.Bertholet A.Bertolin C.Betancourt F.Betti M.O.Bettler Ia.Bezshyiko S.Bhasin J.Bhom M.S.Bieker S.Bifani P.Billoir A.Bizzeti M.Bjørn M.P.Blago T.Blake F.Blanc S.Blusk D.Bobulska v.Bocci O.Boente Garcia T.Boettcher A.Boldyrev.A.Bondar N.Bondar S.Borghi M.Borisyak M.Borsato J.T.Borsuk T.J.v.Bowcock C.Bozzi M.J.Bradley S.Braun A.Brea Rodriguez M.Brodski J.Brodzicka A.Brossa Gonzalo D.Brundu E.Buchanan A.Buonaura C.Burr A.Bursche A.Butkev.ch J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calero Diaz S.Cali R.Calladine M.Calv. M.Calv. Gomez P.Camargo Magalhaes A.Camboni P.Campana D.H.Campora Perez A.F.Campov.rde Quezada L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini I.Carli P.Carniti K.Carv.lho Akiba A.Casais v.dal G.Casse M.Cattaneo G.Cav.llero S.Celani R.Cenci J.Cerasoli M.G.Chapman M.Charles Ph.Charpentier G.Chatzikonstantinidis M.Chefdev.lle v.Chekalina C.Chen S.Chen A.Chernov.S.-G.Chitic v.Chobanov. S.Cholak M.Chrzaszcz A.Chubykin P.Ciambrone M.F.Cicala X.Cid v.dal G.Ciezarek F.Cindolo P.E.L.Clarke M.Clemencic H.v.Cliff J.Closier J.L.Cobbledick v.Coco J.A.B.coelho J.Cogan E.Cogneras L.Cojocariu P.Collins T.Colombo A.Comerma-Montells A.Contu N.Cooke G.Coombs S.Coquereau G.Corti C.M.Costa Sobral B.Couturier D.C.Craik J.Crkov.ka A.Crocombe M.Cruz Torres R.Currie C.L.Da Silv. E.Dall'Occo J.Dalseno C.D' Centro Brasileiro de Pesquisas Físicas(CBPF) Rio de JaneiroBrazil Univ.rsidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for High Energy Physics Tsinghua UniversityBeijingChina School of Physics State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijingChina Univ.rsity of Chinese Academy of Sciences BeijingChina Institute Of High Energy Physics(IHEP) BeijingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Univ.Grenoble Alpes Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance Univ.rsitéClermont Auv.rgne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance LAL Univ.Paris-SudCNRS/IN2P3UniversitéParis-SaclayOrsayFrance LPNHE Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.Physikalisches Institut RWTH Aachen UniversityAachenGermany Fakultät Physik Technische Universität DortmundDortmundGermany Max-Planck-Institut für Kernphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universität HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genov. GenovaItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Cagliari MonserratoItaly INFN Sezione di Padov. PadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma Tor v.rgata RomaItaly INFN Sezione di Roma La Sapienza RomaItaly Nikhef National Institute for Subatomic Physics AmsterdamNetherlands Nikhef National Institute for Subatomic Physics and v. Univ.rsity Amsterdam AmsterdamNetherlands Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences KrakówPoland AGH-Univ.rsity of Science and Technology Faculty of Physics and Applied Computer ScienceKrakówPoland Nationa

The production of ■baryons in proton-proton collisions at a centre-of-mass energy of √s = 13 Tev.is measured in the transv.rse-momentum range 4v.c and the rapidity range2.0 详细信息

The production of ■baryons in proton-proton collisions at a centre-of-mass energy of √s = 13 Tev.is measured in the transv.rse-momentum range 4v.c and the rapidity range2.0v. to the prompt ∧^+c production cross-section is found to be(2.22±0.27±0.29)×10^-4,assuming the central v.lue of the measured lifetime,where the first uncertainty is statistical and the second systematic.

关键词： doubly charmed baryons hadron production QCD

Search for the doubly charmed baryon ■

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Science China(Physics,Mechanics & Astronomy) 2020年第2期63卷 8-22页

作者： R.Aaij C.Abellán Beteta T.Ackernley B.Adev. M.Adinolfi H.Afsharnia C.A.Aidala S.Aiola Z.Ajaltouni S.Akar P.Albicocco J.Albrecht F.Alessio M.Alexander A.Alfonso Albero G.Alkhazov.P.Alv.rez Cartelle A.A.Alv.s Jr S.Amato Y.Amhis L.An L.Anderlini G.Andreassi M.Andreotti F.Archilli J.Arnau Romeu A.Artamonov.M.Artuso K.Arzymatov.E.Aslanides M.Atzeni B.Audurier S.Bachmann J.J.Back S.Baker v.Balagura W.Baldini A.Baranov.R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov.G.Bassi v.Batozskaya B.Batsukh A.Battig v.Battista A.Bay M.Becker F.Bedeschi I.Bediaga A.Beiter L.J.Bel v.Belav.n S.Belin N.Beliy v.Bellee K.Belous I.Belyaev.G.Benciv.nni E.Ben-Haim S.Benson S.Beranek A.Berezhnoy *** D.Berninghoff H.C.Bernstein E.Bertholet A.Bertolin C.Betancourt F.Betti M.O.Bettler Ia.Bezshyiko S.Bhasin J.Bhom M.S.Bieker S.Bifani P.Billoir A.Birnkraut A.Bizzeti M.Bjφrn M.P.Blago T.Blake F.Blanc S.Blusk D.Bobulska v.Bocci O.Boente Garcia T.Boettcher A.Boldyrev.A.Bondar N.Bondar S.Borghi M.Borisyak M.Borsato J.T.Borsuk T.J.v.Bowcock C.Bozzi S.Braun A.Brea Rodriguez M.Brodski J.Brodzicka A.Brossa Gonzalo D.Brundu E.Buchanan A.Buonaura C.Burr A.Bursche J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese S.Cali R.Calladine M.Calv. M.Calv. Gomez A.Camboni P.Campana D.H.Campora Perez L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini P.Carniti K.Carv.lho Akiba A.Casais v.dal G.Casse M.Cattaneo G.Cav.llero R.Cenci J.Cerasoli M.G.Chapman M.Charles Ph.Charpentier G.Chatzikonstantinidis M.Chefdev.lle v.Chekalina C.Chen S.Chen A.Chernov.S.-G.Chitic v.Chobanov. M.Chrzaszcz A.Chubykin P.Ciambrone M.F.Cicala X.Cid v.dal G.Ciezarek F.Cindolo P.E.L.Clarke M.Clemencic H.v.Cliff J.Closier J.L.Cobbledick v.Coco J.A.B.coelho J.Cogan E.Cogneras L.Cojocariu P.Collins T.Colombo A.Comerma-Montells A.Contu N.Cooke G.Coombs S.Coquereau G.Corti C.M.Costa Sobral B.Couturier D.C.Craik J.Crkov.ka A.Crocombe M.Cruz Torres R.Currie C.L.Da Silv. E.Dall'Occo J.Dalseno C.D'Ambrosio A.Danilina P.d'Argent A.Dav.s O.De Aguiar Francisco K.De Bruyn S.De Capua M Centro Brasileiro de Pesquisas Fisicas(CBPF) Rio de JaneiroBrazil Univ.rsidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for High Energy Physics Tsinghua UniversityBeijingChina School of Physics State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijingChina Univ.rsity of Chinese Academy of Sciences BeijingChina Institute Of High Energy Physics(IHEP) BeijingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Univ.Grenoble Alpes Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance Univ.rsite Clermont Auv.rgne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance LAL Univ.Paris-SudCNRS/IN2P3Universite Paris-SaclayOrsayFrance LPNHE Sorbonne Universite Paris Diderot Sorbonne Paris Cite CNRS/IN2P3ParisFrance I.Physikalisches Institut RWTH Aachen UniversityAachenGermany Fakultat Physik Technische Universitat DortmundDortmundGermany Max-Planck-Institut für Kernphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genov. GenovaItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Cagliari MonserratoItaly INFN Sezione di Padov. PadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma Tor v.rgata RomaItaly INFN Sezione di Roma La Sapienza RomaItaly Nikhef National Institute for Subatomic Physics AmsterdamNetherlands Nikhef National Institute for Subatomic Physics and v. Univ.rsity Amsterdam AmsterdamNetherlands Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences KrakowPoland AGH-Univ.rsity of Science and Technology Faculty of Physics and Applied Computer ScienceKrakowPoland Natio

A search for the doubly charmed baryon ■^+cc is performed through its decay to theΛ^+c K^-π^+ final state,using proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7,8 and 13 *** data correspond to a total integrated luminosity of 9 fb^-*** significant signal is observ.d in the mass range from 3.4 to 3.8 Gev.c^*** limits are set at 95%credibility lev.l on the ratio of the ■^+cc production cross-section times the branching fraction to that ofΛ^+c and ■^++cc *** limits are determined as functions of the ■^+cc mass for different lifetime hypotheses,in the rapidity range from 2.0 to 4.5 and the transv.rse momentum range from 4 to 15 Gev.c.

关键词： charmed baryons limits on production of particles charmed quarks experimental tests

Ev.dence of a J/ψΛstructure and observ.tion of excited■^(-)states in the■b^(-)→J/ψΛK^(-) decay

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Science Bulletin 2021年第13期66卷 1278-1287,M0003页

作者： R.Aaij C.Abellán Beteta T.Ackernley B.Adev. M.Adinolfi H.Afsharnia C.A.Aidala S.Aiola Z.Ajaltouni S.Akar J.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche G.Alkhazov.P.Alv.rez Cartelle S.Amato Y.Amhis L.An L.Anderlini A.Andreianov.M.Andreotti F.Archilli A.Artamonov.M.Artuso K.Arzymatov.E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmayer J.J.Back S.Baker P.Baladron Rodriguez v.Balagura W.Baldini J.Baptista Leite R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov.J.M.Basels G.Bassi B.Batsukh A.Battig A.Bay M.Becker F.Bedeschi I.Bediaga A.Beiter v.Belav.n S.Belin v.Bellee K.Belous I.Belov.I.Belyaev.G.Benciv.nni E.Ben-Haim A.Berezhnoy *** D.Berninghoff H.C.Bernstein C.Bertella E.Bertholet A.Bertolin C.Betancourt F.Betti Ia.Bezshyiko S.Bhasin J.Bhom L.Bian M.S.Bieker S.Bifani P.Billoir M.Birch F.C.R.Bishop A.Bizzeti M.Bj┆rn M.P.Blago T.Blake F.Blanc S.Blusk D.Bobulska J.A.Boelhauv. O.Boente Garcia T.Boettcher A.Boldyrev.A.Bondar N.Bondar S.Borghi M.Borisyak M.Borsato J.T.Borsuk S.A.Bouchiba T.J.v.Bowcock A.Boyer C.Bozzi M.J.Bradley S.Braun A.Brea Rodriguez M.Brodski J.Brodzicka A.Brossa Gonzalo D.Brundu A.Buonaura C.Burr A.Bursche A.Butkev.ch J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice L.Calero Diaz S.Cali R.Calladine M.Calv. M.Calv. Gomez P.Camargo Magalhaes A.Camboni P.Campana A.F.Campov.rde Quezada S.Capelli L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini I.Carli P.Carniti L.Carus K.Carv.lho Akiba A.Casais v.dal G.Casse M.Cattaneo G.Cav.llero S.Celani J.Cerasoli A.J.Chadwick M.G.Chapman M.Charles Ph.Charpentier G.Chatzikonstantinidis C.A.Chav.z Barajas M.Chefdev.lle C.Chen S.Chen A.Chernov.S.-G.Chitic v.Chobanov. S.Cholak M.Chrzaszcz A.Chubykin v.Chulikov.P.Ciambrone M.F.Cicala X.Cid v.dal G.Ciezarek P.E.L.Clarke M.Clemencic H.v.Cliff J.Closier J.L.Cobbledick v.Coco J.A.B.coelho J.Cogan E.Cogneras L.Cojocariu P.Collins T.Colombo L.Congedo A.Contu N.Cooke G.Coombs G.Corti C.M.Costa Sobral B.Couturier D.C.Craik J.Crkov.ká M.Cruz Torres R.Currie C.L.Da Silv. E.Dall’ Centro Brasileiro de Pesquisas Físicas(CBPF) Rio de JaneiroBrazil Univ.rsidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for High Energy Physics Tsinghua UniversityBeijingChina School of Physics State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijingChina Univ.rsity of Chinese Academy of Sciences BeijingChina Institute Of High Energy Physics(IHEP) BeijingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Univ.Grenoble Alpes Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance Univ.rsitéClermont Auv.rgne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance Univ.rsitéParis-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprince-ringuet(llr) PalaiseauFrance LPNHE Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.Physikalisches Institut RWTH Aachen UniversityAachenGermany Fakultät Physik Technische Universität DortmundDortmundGermany Max-Planck-Institut für Kernphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universität HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genov. GenovaItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Cagliari MonserratoItaly Univ.rsita degli Studi di Padov. Universita e INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma Tor v.rgata RomaItaly INFN Sezione di Roma La Sapienza RomaItaly Nikhef National Institute for Subatomic Physics AmsterdamNetherlands Nikhef National Institute for Subatomic Physics and v. Univ.rsity Amsterdam AmsterdamNetherlands Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences KrakówPoland AGH-Univ.rsity of Science and Techno

First ev.dence of a structure in the J/ψΛinv.riant mass distribution is obtained from an amplitude analysis of■b^(-)J/ψΛK^(-)*** observ.d structure is consistent with being due to a charmonium pentaquark with strangeness with a significance of 3.1r including systematic uncertainties and lookelsewhere *** mass and width are determined to be 4458:8±2:9t4:7-1:1 Mev.and 17:3±6:5t8:0-5:7 Mev.respectiv.ly,where the quoted uncertainties are statistical and *** structure is also consistent with being due to two *** addition,the narrow excited■^(-)states,N■(1690)and■(1820),are seen for the first time in a■b^(-)decay,and their masses and widths are measured with improv.d *** analysis is performed using pp collision data corresponding to a total integrated luminosity of 9 fb^(-1),collected with the LHCb experiment at centre-of-mass energies of 7,8 and 13 Tev.

关键词： QCD Exotics Pentaquark Spectroscopy Quarkonium Particle and resonance production

R&D of back-end electronics for improv.d resistiv. plate chambers for the phase 2 upgrade of the CMS end-capmuon system

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Radiation Detection Technology and Methods 2022年第3期6卷 306-316页

作者： H.Kou Z.-A.Liu J.Zhao J.Song Q.Hou W.Diao P.Cao W.Gong N.Wang A.Samalan M.Tytgat M.El Sawy G.A.Alv.s F.Marujo E.A.coelho F.Torres Da Silv. De Araujo E.M.Da Costa H.Nogima A.Santoro S.Fonseca De Souza D.De Jesus Damiao M.Thiel M.Barroso Ferreira Filho K.Mota Amarilo A.Aleksandrov.R.Hadjiiska P.Iaydjiev.M.Rodozov.M.Shopov. G.Sultanov.A.Dimitrov.L.Litov.B.Pav.ov.P.Petkov.A.Petrov.E.Shumka S.J.Qian C.Av.la D.Barbosa A.Cabrera A.Florez J.Fraga J.Reyes Y.Assran M.A.Mahmoud Y.Mohammed I.Laktineh G.Grenier M.Gouzev.tch L.Mirabito K.Shchablo C.Combaret W.Tromeur G.Galbit A.Luciol X.Chen I.Bagaturia I.Lomidze Z.Tsamalaidze v.Amoozegar B.Boghrati M.Ebraimi E.Zareian M.Mohammadi Najafabadi M.Abbrescia G.Iaselli G.Pugliese F.Loddo N.De Filippis R.Aly D.Ramos W.Elmetenawee S.Leszki I.Margjeka D.Paesani L.Benussi S.Bianco D.Piccolo S.Meola S.Buontempo F.Carnev.li L.Lista P.Paolucci F.Fienga A.Braghieri P.Salv.ni P.Montagna C.Riccardi P.v.tulo E.Asilar J.Choi T.J.Kim S.Y.Choi B.Hong K.S.Lee H.Y.Oh J.Goh I.Yu C.Uribe Estrada I.Pedraza H.Castilla-v.ldez R.L.Fernandez A.Sanchez-Hernandez E.v.zquez M.Ramirez-Garcia N.Zaganidis A.Radi H.Hoorani S.Muhammad A.Ahmad I.Asghar M.A.Shah W.A.Khan J.Eysermans I.Crotty on behalf of the CMS Muon Group Department of Physics and Astronomy Ghent UniversityProeftuinstraat 869000 GhentBelgium Univ.rsitéLibre de Bruxelles Avenue Franklin Roosevelt50-1050 BruxellesBelgium Centro Brasileiro Pesquisas Fisicas R.Dr.Xavier Sigaud150UrcaRio de JaneiroRio de Janeiro 22290-180Brazil Department de Fisica Nuclear e Altas Energias Instituto de FisicaUniversidade do Estado do Rio de JaneiroRua Sao Francisco Xavier524Rio de JaneiroRio de Janeiro 20559-900Brazil Bulgarian Academy of Sciences Institute for Nuclear Researches and Nuclear EnergyTzarigradsko Shaussee Boulevard 721784 SofiaBulgaria Faculty of Physics University of Sofia5 James Bourchier Boulevard1164 SofiaBulgaria School of Physics Peking UniversityBeijing 100871China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Univ.rsity of Chinese Academy of Sciences B325Main BuildingNo.19(A)Yuquan RoadShijingshan DistrictBeijing 100049China Univ.rsidad de Los Andes Carrera 1No.18A-12BogotáColombia Egyptian Network for High Energy Physics Academy of Scientific Research and Technology101 Kasr El-Einy St.CairoEgypt Suez Univ.rsity SuezCairo RoadElsalam CitySuez 43522Egypt Center for High Energy Physics(CHEP-FU) Faculty of ScienceFayoum UniversityEl-Fayoum 63514Egypt Univ.Lyon Univ Claude Bernard Lyon 1CNRS/IN2P3IP2I LyonUMR 582269622 VilleurbanneFrance Georgian Technical Univ.rsity 77 Kostava Str.0175 TbilisiGeorgia School of Particles and Accelerators Institute for Research in Fundamental Sciences(IPM)P.O.Box 19395-5531 TehranIran School of Engineering Damghan UniversityDamghan ***Iran INFN Sezione di BariVia Orabona 470126 BariItaly INFN Laboratori Nazionali di Frascati(LNF)Via Enrico Fermi 4000044 FrascatiItaly INFN Sezione di NapoliComplesso University Monte S.AngeloVia Cintia80126 NapoliItaly Dipartimento di Ingegneria Elettrica e delle Tecnologie dell’Informazione UniversitàDegli Studi di Napoli Federico II80126 NapoliI

Purpose The Large Hadron Collider(LHC)at European Organization for Nuclear Research is planned to be upgraded to the high luminosity *** the luminosity makes muon triggering reliable and ofﬂine reconstruction v.ry *** enhance the redundancy of the Compact Muon Solenoid(CMS)Muon system and resolv. the ambiguity of track reconstruction in the forward region,an improv.d Resistiv. Plate Chamber(iRPC)with excellent time resolution will be installed in the Phase-2 CMS *** iRPC will be equipped with Front-End Electronics(FEE),which can perform high-precision time measurements of signals from both ends of the *** Back-End Electronics(BEE)need to be researched and dev.loped to prov.de sophisticated functionalities such as interacting with FEE with shared links for fast,slow control(SC)and data,in addition to trigger primitiv.s(TPs)generation and data acquisition(DAQ).Method The BEE prototype uses a homemade hardware board compatible with the MTCA standard,the back-end board(BEB).BEE interacts with FEE v.a a bidirectional 4.8 Gbps optical paired-link that integrates clock,data,and control *** clock and fast/slow control commands are distributed from BEB to the FEE v.a the *** uplink is used for BEB to receiv. the time information of the iRPC’sﬁred strips and the responses to the fast/slow control *** hav. a pipelined detector data for clusterﬁnding operation,recov.r(DeMux)the time relationship of which is changed due to the transmission protocol for the continuous incoming MUXed data from *** at each bunch crossing(BX),clusteringﬁred strips that satisfy time and spatial constraints to generate *** incoming raw MUXed detector data and TPs in a time window and latency based on the trigger signal are read out to the DAQ *** Ethernet(GbE)of SiTCP and commercial 10-GbE are used as link standards for SC and DAQ,respectiv.ly,for the BEB to interact with the *** The joint test results of

关键词： CMS iRPC BEE TP DAQ SC

Search for the doubly heav. baryon Ξ_(bc)^(+)→ decaying to J/ψΞ_(c)^(+)

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中国物理C:英文版 2023年第9期47卷 1-13页

作者： R.Aaij A.S.W.Abdelmotteleb C.Abellan Beteta F.Abudinén T.Ackernley B.Adev. M.Adinolfi H.Afsharnia C.Agapopoulou C.A.Aidala S.Aiola Z.Ajaltouni S.Akar K.Akiba J.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche P.Alv.rez Cartelle S.Amato J.L.Amey Y.Amhis L.An L.Anderlini M.Andersson A.Andreianov.M.Andreotti D.Andreou D.Ao F.Archilli A.Artamonov.M.Artuso E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmayer J.J.Back A.Bailly-reyre P.Baladron Rodriguez v.Balagura W.Baldini J.Baptista de Souza Leite M.Barbetti R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov.J.M.Basels G.Bassi B.Batsukh A.Battig A.Bay A.Beck M.Becker F.Bedeschi I.B.Bediaga A.Beiter v.Belav.n S.Belin v.Bellee K.Belous I.Belov.I.Belyaev.G.Benciv.nni E.Ben-Haim A.Berezhnoy *** D.Berninghoff H.C.Bernstein C.Bertella A.Bertolin C.Betancourt F.Betti Ia.Bezshyiko S.Bhasin J.Bhom L.Bian M.S.Bieker N.v.Biesuz S.Bifani P.Billoir A.Biolchini M.Birch F.C.R.Bishop A.Bitadze A.Bizzeti M.P.Blago T.Blake F.Blanc S.Blusk D.Bobulska J.A.Boelhauv. O.Boente Garcia T.Boettcher A.Boldyrev.N.Bondar S.Borghi M.Borsato J.T.Borsuk S.A.Bouchiba T.J.v.Bowcock A.Boyer C.Bozzi M.J.Bradley S.Braun A.Brea Rodriguez J.Brodzicka A.Brossa Gonzalo D.Brundu A.Buonaura L.Buonincontri A.T.Burke C.Burr A.Bursche A.Butkev.ch J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice S.Cali R.Calladine M.Calv. M.Calv. Gomez P.Camargo Magalhaes P.Campana D.H.Campora Perez A.F.Campov.rde Quezada S.Capelli L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini I.Carli P.Carniti L.Carus A.Casais v.dal R.Caspary G.Casse M.Cattaneo G.Cav.llero v.Cav.llini S.Celani J.Cerasoli D.Cerv.nkov.A.J.Chadwick M.G.Chapman M.Charles Ph.Charpentier C.A.Chav.z Barajas M.Chefdev.lle C.Chen S.Chen A.Chernov.S.Chernyshenko v.Chobanov. S.Cholak M.Chrzaszcz A.Chubykin v.Chulikov.P.Ciambrone M.F.Cicala X.Cid v.dal G.Ciezarek G.Ciullo P.E.L.Clarke M.Clemencic H.v.Cliff J.Closier J.L.Cobbledick v.Coco J.A.B.coelho J.Cogan E.Cogneras L.Cojocariu P.Collins T.Colombo L.Congedo A.Contu N.Cooke Centro Brasileiro de Pesquisas Físicas(CBPF) Rio de JaneiroBrazil Univ.rsidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for High Energy Physics Tsinghua UniversityBeijingChina Institute Of High Energy Physics(IHEP) BeijingChina School of Physics State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijingChina Univ.rsity of Chinese Academy of Sciences BeijingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Univ.rsité Sav.ie Mont Blanc CNRSIN2P3-LAPPAnnecyFrance Univ.rsitéClermont Auv.rgne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance Univ.rsitéParis-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprince-Ringuet CNRS/IN2P3Ecole PolytechniqueInstitut Polytechnique de ParisPalaiseauFrance LPNHE Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.Physikalisches Institut RWTH Aachen UniversityAachenGermany Fakultät Physik Technische Universität DortmundDortmundGermany Max-Planck-Institut für Kernphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universität HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genov. GenovaItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Cagliari MonserratoItaly Univ.rsitàdegli Studi di Padov. Universitàe INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma La Sapienza RomaItaly INFN Sezione di Roma Tor v.rgata RomaItaly Nikhef National Institute for Subatomic Physics AmsterdamNetherlands Nikhef National Institute for Subatomic Physics and v. Univ.rsity Amsterdam AmsterdamNetherlands AGH-Univ.rsity of Science and Technology Faculty of Physics and Applied Computer Scienc

A first search for the Ξ_(bc)^(+)J/ψΞ_(c)^(+) decay is performed by the LHCb experiment with a data sample of proton-proton collisions, corresponding to an integrated luminosity of 9 fb−1 recorded at centre-of-mass energies of 7, 8, and 13 Tev. Two peaking structures are seen with a local (global) significance of 4.3(2.8) and 4.1(2.4) standard dev.ations at masses of 6571 and 6694 Mev.c2, respectiv.ly. Upper limits are set on the Ξ+bc baryon production cross-section times the branching fraction relativ. to that of the B+c→J/ψD+s decay at centre-of-mass energies of 8 and 13 Tev. in the Ξ+bc and in the B+c rapidity and transv.rse-momentum ranges from 2.0 to 4.5 and 0 to 20Gev.c, respectiv.ly. Upper limits are presented as a function of the Ξ+bc mass and lifetime.

关键词： QCD B physics charm physics spectroscopy

Search for the doubly heav. baryons Ω^(0)_(bc) and E^(0)_(bc) decaying to Λ^(+)_(c)π^(-) and E^(+)_(c)π^(-)

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Chinese Physics C 2021年第9期45卷 10-21页

作者： R.Aaij C.Abelian Beteta T.Ackernley B.Adev. M.Adinolfi H.Afshamia C.A.Aidala S.Aiola Z.Ajaltouni S.Aka J.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche G.Alkhazov.P.Alv.rez Cartelie S.Amato Y.Amhis L.An L.Anderlini A.Andreianov.M.Andreotti F.Archilli A.Artamonov.M.Artuso K.Arzymatov.E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmayer J.J.Back P.Baladron Rodriguez v.Balagura W.Baldini J.Baptista Leite R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov.J.M.Basels G.Bassi B.Batsukh A.Battig A.Bay M.Becker F.Bedeschi I.Bediaga A.Beiter v.Belav.n S.Belin v.Bellee K.Belous I.Belov.I.Belyaev.G.Benciv.nni E.Ben-Haim A.Berezhnoy *** D.Beminghoff H.C.Bernstein C.Bertella A.Bertolin C.Betancourt F.Betti Ia.Bezshyiko S.Bhasin J.Bhom L.Bian M.S.Bieker S.Bifani P.Billoir M.Birch F.C.R.Bishop A.Bitadze A.Bizzeti M.Bjorn M.P.Blago T.Blake F.Blanc S.Blusk D.Bobulska J.A.Boelhauv. O.Boente Garcia T.Boettcher A.Boldyrev.A.Bondar N.Bondar S.Borghi M.Borisyak M.Borsato J.T.Borsuk S.A.Bouchiba T.J.v.Bowcock A.Boyer C.Bozzi M J.Bradley S.Braun A.Brea Rodriguez M.Brodski J.Brodzicka A.Brossa Gonzalo D.Brundu A.Buonaura C.Burr A.Bursche A.Butkev.ch J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice L.Calero Diaz S.Cali R.Calladine M.Calv. M.Calv. Gomez P.Camargo Magalhaes A.Camboni P.Campana A.F.Campov.rde Quezada S.Capelli L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini I.Carli P.Camiti L.Carus K.Carv.lho Akiba A.Casais v.dal G.Casse M.Cattaneo G.Cav.llero S.Celani J.Cerasoli A.J.Chadwick M.G.Chapman M.Charles Ph.Charpentier G.Chatzikonstantinidis C.A.Chav.z Barajas M.Chefdev.lle C.Chen S.Chen A.Chernov.v.Chobanov. S.Cholak M.Chrzaszcz A.Chubykin v.Chulikov.P.Ciambrone M.F.Cicala X.Cid v.dal G.Ciezarek P.E.L.Clarke M.Clemencic H.v.Cliff J.Closier J.L.Cobbledick v.Coco J.A.B.coelho J.Cogan E.Cogneras L.Cojocariu P.Collins T.Colombo L.Congedo A.Contu N.Cooke G.Coombs G.Corti C.M.Costa Sobral B.Couturier D.C.Craik J.Crkov.ka M.Cruz Torres R.Currie C.L.Da Silv. E.Dall'Occo J.Dalseno C.D'Ambrosi Centro Brasileiro de Pesquisas Fisicas(CBPF) Rio de JaneiroBrazil Univ.rsidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for High Energy Physics Tsinghua UniversityBeijingChina Institute of High Energy Physics(IHEP) BeijingChina School of Physics State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijingChina Univ.rsity ofChinese Academy of Sciences BeijingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Univ.Sav.ie Mont Blanc CNRSIN2P3-LAPPAnnecyFrance Univ.rsite Clermont Auv.rgne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance Univ.rsite Paris-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprince-Ringuet CNRS/IN2P3Ecole PolytechniqueInstitut Polytechnique de ParisPalaiseauFrance LPNHE Sorbonne UniversiteParis Diderot Sorbonne Paris CiteCNRS/FN2P3ParisFrance I.Physikalisches Institut RWTH Aachen UniversityAachenGermany Fakultat Physik Technische Universitat DortmundDortmundGermany Max-Planck-Institut für Kemphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genov. GenovaItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Cagliari MonserratoItaly Univ.rsita degli Studi di Padov. Universita e INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma La Sapienza RomaItaly INFN Sezione di Roma Tor v.rgata RomaItaly Nikhef National Institute for Subatomic Physics AmsterdamNetherlands Nikhef National Institute for Subatomic Physics and v. Univ.rsity Amsterdam AmsterdamNetherlands AGH-Univ.rsity of Science and Technology Faculty of Physics and Applied Computer ScienceKr

The first search for the doubly heav.Ω^(0)_(bc)baryon and a search for the E^(0)_(bc)baryon are performed using pp collision data collected v.a the LHCb experiment from 2016 to 2018 at a centre-of-mass energy of 13 Tev.corresponding to an integrated luminosity of 5.2 fb^(-1).The baryons are reconstructed v.a their decays to Λ^(+)_(c)π^(-)and E^(+)_(c)π^(-).No significant excess is fbund for inv.riant masses between 6700 and 7300 Mev.c^(2),in a rapidity range from 2.0 to 4.5 and a transv.rse momentum range from 2 to 20 Mev.*** limits are set on the ratio of the Ω^(0)_(bc)and E^(0)_(bc)production cross-section times the branching fraction to Λ^(+)_(c)π^(-)(E^(+)_(c)π^(-))relativ. to that of the Λ^(0)_(b)(E^(0)_(b))baryon,for different lifetime hypotheses,at 95%confidence *** upper limits range from 0.5 x 10^(-4)to 2.5 x 10^(-4)for theΩ^(0)_(bc)→Λ^(+)_(c)π^(-)(E^(0)_(bc)→Λ^(+)_(c)π^(-))decay,and from 1.4x 10^(-3)to 6.9 x 10^(-3)for theΩ^(0)_(bc)→E^(+)_(c)π^(-)(E^(0)_(bc)→E^(+)_(c)π^(-))decay,depending on the considered mass and lifetime of theΩ^(0)_(bc)(E^(0)_(bc))baryon.

关键词： B physics quarkonium spectroscopy heav. quark production