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Large-Scale Estimation of distribution Algorithms with Adaptive Heavy tailed Random Pro jection Ensembles

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Journal of Computer Science & technology 2019年第6期34卷 1241-1257页

作者： Momodou L.Sanyang Ata Kabán School of Computer Science University of BirminghamEdgbastonBirmingham B152TTU.K. School of information technology and Communication University of The GambiaSerekundaThe Gambia

We present new variants of Estimation of distribution Algorithms (EdA) for large-scale continuous optimisation that extend and enhance a recently proposed random projection (RP) ensemble based approach. the main novelty here is to depart from the theory of RPs that require (sub-)Gaussian random matrices for norm-preservation, and instead for the purposes of high-dimensional search we propose to employ random matrices with independent and identically distributed entries drawn from a t-distribution. We analytically show that the implicitly resulting high-dimensional covariance of the search distribution is enlarged as a result. Moreover, the extent of this enlargement is controlled by a single parameter, the degree of freedom. For this reason, in the context of optimisation, such heavy tailed random matrices turn out to be preferable over the previously employed (sub-)Gaussians. Based on this observation, we then propose novel covariance adaptation schemes that are able to adapt the degree of freedom parameter during the search, and give rise to a flexible approach to balance exploration versus exploitation. We perform a thorough experimental study on high-dimensional benchmark functions, and provide statistical analyses that demonstrate the state-of-the-art performance of our approach when compared with existing alternatives in problems with 1000 search variables.

关键词： covariance adaptation estimation of distribution algorithm random projection ensemble t-distribution

search for the doubly heavy 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.Adeva 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.Alvarez 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.Belavin S.Belin V.Bellee K.Belous i.Belov i.Belyaev G.Bencivenni 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.Boelhauve 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.Butkevich J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice L.Calero diaz S.Cali R.Calladine M.Calvi M.Calvo Gomez P.Camargo Magalhaes A.Camboni P.Campana A.F.Campoverde Quezada S.Capelli L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini i.Carli P.Carniti L.Carus K.Carvalho Akiba A.Casais Vidal G.Casse M.Cattaneo G.Cavallero S.Celani J.Cerasoli A.J.Chadwick M.G.Chapman M.Charles ph.Charpentier G.Chatzikonstantinidis C.A.Chavez Barajas M.Chefdeville C.Chen S.Chen A.Chernov V.Chobanova S.Cholak M.Chrzaszcz A.Chubykin V.Chulikov P.Ciambrone M.F.Cicala X.Cid Vidal 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.Crkovská M.Cruz torres R.Currie C.L.da Silva E.dall'Occo J.dalseno C.d'Amb university of Edinburgh Horia Hulubei National institute of physics and Nuclear Engineering iNFN Sezione di Bari università di Bari Los Alamos National Laboratory (LANL) Van Swinderen institute university of Groningen universiteit Maastricht AGH-university of Science and technology Faculty of physics and Applied Computer Science université Clermont Auvergne università di Cagliari institute for Nuclear Research of the National Academy of Sciences (KiNR) School of physics university 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 university Novosibirsk State university CNRS/iN2P3 department of physics and Astronomy uppsala university università di Genova School of physics State Key Laboratory of Nuclear physics and technology Peking university National Center for Nuclear Research (NCBJ) università di Roma tor Vergata Pontifícia universidade Católica do Rio de Janeiro (PuC-Rio) universidade Federal do triangulo Mineiro (uFtM) institute of Particle physics LPC Central China Normal university Hangzhou institute for Advanced Study uCAS instituto de Fisica Corpuscular Centro Mixto universidad de Valencia-CSiC Nikhef National institute for Subatomic physics and Vu university Amsterdam National Research tomsk Polytechnic university AGH-university of Science and technology Faculty of Computer Science Electronics and telecommunications university of Michigan università di Siena università di Padova Scuola Normale Superiore National Research Centre Kurchatov institute università degli Studi di Milano MSu-iligan institute of technology (MSu-iit) università di Firenze iNFN Sezione di Roma La Sapienza institut für physik universit?t Rostock iNFN Sezione di Milano departamento de Fisica universidad Nacional de Colombia universit?t Bonn-Helmholtz-institut für Strahlen und Kernphysik Hanoi university of Science università di Pisa P.N. Lebedev physical institute Russian Academy of Science (LPi RAS) università

the first search for the doubly heavy Ωbc0baryon and a search for the Ξbc0baryon are performed using pp collision data collected via 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 via their decays to ∧c+π-andΞc+π-.No significant excess is found for invariant masses between 6700 and 7300 MeV/c2,in a rapidity range from2.0 to 4.5 and a transverse 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-） relative 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 heavy quark production

search for the doubly heavy 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.Adeva 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.Alvarez 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.Belavin S.Belin V.Bellee K.Belous i.Belov i.Belyaev G.Bencivenni 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.Boelhauve 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.Butkevich J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice S.Cali R.Calladine M.Calvi M.Calvo Gomez P.Camargo Magalhaes P.Campana d.H.Campora Perez A.F.Campoverde Quezada S.Capelli L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini i.Carli P.Carniti L.Carus A.Casais Vidal R.Caspary G.Casse M.Cattaneo G.Cavallero V.Cavallini S.Celani J.Cerasoli d.Cervenkov A.J.Chadwick M.G.Chapman M.Charles ph.Charpentier C.A.Chavez Barajas M.Chefdeville C.Chen S.Chen A.Chernov S.Chernyshenko V.Chobanova S.Cholak M.Chrzaszcz A.Chubykin V.Chulikov P.Ciambrone M.F.Cicala X.Cid Vidal 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 universidade 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 university of Chinese Academy of Sciences BeijingChina institute of Particle physics Central China Normal UniversityWuhanHubeiChina université Savoie Mont Blanc CNRSIN2P3-LAPPAnnecyFrance universitéClermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille univ CNRS/IN2P3CPPMMarseilleFrance universitéParis-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 Genova GenovaItaly iNFN Sezione di Milano MilanoItaly iNFN Sezione di Milano-Bicocca MilanoItaly iNFN Sezione di Cagliari MonserratoItaly universitàdegli Studi di Padova Universitàe INFNPadovaPadovaItaly iNFN Sezione di Pisa PisaItaly iNFN Sezione di Roma La Sapienza RomaItaly iNFN Sezione di Roma tor Vergata RomaItaly Nikhef National institute for Subatomic physics AmsterdamNetherlands Nikhef National institute for Subatomic physics and Vu university Amsterdam AmsterdamNetherlands AGH-university 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 deviations at masses of 6571 and 6694 MeV/c2, respectively. upper limits are set on the Ξ+bc baryon production cross-section times the branching fraction relative 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 transverse-momentum ranges from 2.0 to 4.5 and 0 to 20GeV/c, respectively. 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 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.Adeva 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.Alvarez 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.Belavin S.Belin V.Bellee K.Belous i.Belov i.Belyaev G.Benane G.Bencivenni 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.Boelhauve 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.Butkevich J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice S.Cali R.Calladine M.Calvi M.Calvo Gomez P.Campana d.H.Campora Perez A.F.Campoverde Quezada S.Capelli L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini P.Carniti L.Carus A.Casais Vidal R.Caspary G.Casse M.Cattaneo G.Cavallero V.Cavallini S.Celani J.Cerasoli d.Cervenkov A.J.Chadwick M.G.Chapman M.Charles ph.Charpentier C.A.Chavez Barajas M.Chefdeville C.Chen S.Chen A.Chernov S.Chernyshenko V.Chobanova S.Cholak M.Chrzaszcz A.Chubykin V.Chulikov P.Ciambrone M.F.Cicala X.Cid Vidal 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 universidade 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 university of Chinese Academy of Sciences BeijingChina institute of Particle physics Central China Normal UniversityWuhanHubeiChina université Savoie Mont Blanc CNRSIN2P3-LAPPAnnecyFrance universitéClermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille univ CNRS/IN2P3CPPMMarseilleFrance universitéParis-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 Genova GenovaItaly iNFN Sezione di Milano MilanoItaly iNFN Sezione di Milano-Bicocca MilanoItaly iNFN Sezione di Cagliari MonserratoItaly universitàdegli Studi di Padova Universitàe INFNPadovaPadovaItaly iNFN Sezione di Pisa PisaItaly iNFN Sezione di Roma La Sapienza RomaItaly iNFN Sezione di Roma tor Vergata RomaItaly Nikhef National institute for Subatomic physics AmsterdamNetherlands Nikhef National institute for Subatomic physics and Vu university Amsterdam AmsterdamNetherlands AGH-university 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 observed 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 level 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 improves upon the previous best limit.

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

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.Adeva 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.Alvarez 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.Bachmaver 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.Belavin S.Belin V.Bellee K.Belous i.Belov i.Belyaev G.Bencivenni 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.Boelhauve 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.Butkevich J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice L.Calero diaz S.Cali R.Calladine M.Calvi M.Calvo Gomez P.Camargo Magalhaes A.Camboni P.Campana d.H.Campora Perez A.F.Campoverde Quezada S.Capelli L.Capriotti A.Carbonel G.Carboni R.Cardinale A.Cardini i.Carli P.Carniti L.Carus K.Carvalho Akiba A.Casais Vidal G.Casse M.Cattaneo G.Cavallero S.Celani J.Cerasoli A.J.Chadwick M.G.Chapman M.Charles ph.Charpentier G.Chatzikonstantinidis C.A.Chavez Barajas M.Chefdeville C.Chen S.Chen A.Chernov S.-G.Chitic V.Chobanova S.Cholak M.Chrzaszcz A.Chubykin V.Chulikov P.Ciambrone M.F.Cicala X.Cid Vidal 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.Crkovska M.Cruz Centro Brasileiro de Pesquisas Fisicas(CBPF) Riode JaneiroBrazil universidade 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 university 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 universite Clermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille univ CNRS/IN2P3CPPMMarseilleFrance universitq 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 Genova GenovaItaly iNFN Sezione di Milano Bicocca Milanolaly iNFN Sezione di Milano MilanoItaly iNFN Sezione di Cagliari Monserratoltaly universita degli Studi di Padova Universita e INFNPadovaPadovaItaly iNFN Sezione di Pisa PisaItaly iNFN Sezione di Roma tor Vergata RomaItaly iNFN Sezione di Roma La Sapienza RomaItaly Nikhef National institute for Subatomic physics AmsterdamNetherlands Nikhef National institute for Subatomic physics and Vu university Amsterdam AmsterdamNetherlands Henryk Niewodniczanski institute of Nuclear physics Polish Academy of Sciences KrakowPoland AGH-university 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 observed and an upper limitof 1.1x 10^(-7)at 90%confidence level is set on the branching fraction.

关键词： B physics flavour physics rare decay ω-Фmixing branching fraction

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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.Adeva 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.Alvarez Cartelle A.A.Alves 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.Belavin S.Belin N.Beliy V.Bellee K.Belous i.Belyaev G.Bencivenni 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.Calvi M.Calvo Gomez A.Camboni P.Campana d.H.Campora Perez L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini P.Carniti K.Carvalho Akiba A.Casais Vidal G.Casse M.Cattaneo G.Cavallero R.Cenci J.Cerasoli M.G.Chapman M.Charles ph.Charpentier G.Chatzikonstantinidis M.Chefdeville V.Chekalina C.Chen S.Chen A.Chernov S.-G.Chitic V.Chobanova M.Chrzaszcz A.Chubykin P.Ciambrone M.F.Cicala X.Cid Vidal 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.Crkovska A.Crocombe M.Cruz torres R.Currie C.L.da Silva E.dall'Occo J.dalseno C.d'Ambrosio A.danilina P.d'Argent A.davis O.de Aguiar Francisco K.de Bruyn S.de Capua M Centro Brasileiro de Pesquisas Fisicas(CBPF) Rio de JaneiroBrazil universidade 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 university 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 universite Clermont Auvergne 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 Genova GenovaItaly iNFN Sezione di Milano-Bicocca MilanoItaly iNFN Sezione di Milano MilanoItaly iNFN Sezione di Cagliari MonserratoItaly iNFN Sezione di Padova PadovaItaly iNFN Sezione di Pisa PisaItaly iNFN Sezione di Roma tor Vergata RomaItaly iNFN Sezione di Roma La Sapienza RomaItaly Nikhef National institute for Subatomic physics AmsterdamNetherlands Nikhef National institute for Subatomic physics and Vu university Amsterdam AmsterdamNetherlands Henryk Niewodniczanski institute of Nuclear physics Polish Academy of Sciences KrakowPoland AGH-university 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 observed in the mass range from 3.4 to 3.8 GeV/c^*** limits are set at 95%credibility level 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 transverse momentum range from 4 to 15 GeV/c.

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

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search for the doubly heavy 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.Adeva 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.Alvarez 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.Belavin S.Belin V.Bellee K.Belous i.Belov i.Belyaev G.Bencivenni 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.Boelhauve 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.Butkevich J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice L.Calero diaz S.Cali R.Calladine M.Calvi M.Calvo Gomez P.Camargo Magalhaes A.Camboni P.Campana A.F.Campoverde Quezada S.Capelli L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini i.Carli P.Camiti L.Carus K.Carvalho Akiba A.Casais Vidal G.Casse M.Cattaneo G.Cavallero S.Celani J.Cerasoli A.J.Chadwick M.G.Chapman M.Charles ph.Charpentier G.Chatzikonstantinidis C.A.Chavez Barajas M.Chefdeville C.Chen S.Chen A.Chernov V.Chobanova S.Cholak M.Chrzaszcz A.Chubykin V.Chulikov P.Ciambrone M.F.Cicala X.Cid Vidal 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.Crkovska M.Cruz torres R.Currie C.L.da Silva E.dall'Occo J.dalseno C.d'Ambrosi Centro Brasileiro de Pesquisas Fisicas(CBPF) Rio de JaneiroBrazil universidade 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 university ofChinese Academy of Sciences BeijingChina institute of Particle physics Central China Normal UniversityWuhanHubeiChina univ.Savoie Mont Blanc CNRSIN2P3-LAPPAnnecyFrance universite Clermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille univ CNRS/IN2P3CPPMMarseilleFrance universite 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 Genova GenovaItaly iNFN Sezione di Milano MilanoItaly iNFN Sezione di Milano-Bicocca MilanoItaly iNFN Sezione di Cagliari MonserratoItaly universita degli Studi di Padova Universita e INFNPadovaPadovaItaly iNFN Sezione di Pisa PisaItaly iNFN Sezione di Roma La Sapienza RomaItaly iNFN Sezione di Roma tor Vergata RomaItaly Nikhef National institute for Subatomic physics AmsterdamNetherlands Nikhef National institute for Subatomic physics and Vu university Amsterdam AmsterdamNetherlands AGH-university of Science and technology Faculty of Physics and Applied Computer ScienceKr

the first search for the doubly heavyΩ^(0)_(bc)baryon and a search for the E^(0)_(bc)baryon are performed using pp collision data collected via 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 via their decays to Λ^(+)_(c)π^(-)and E^(+)_(c)π^(-).No significant excess is fbund for invariant masses between 6700 and 7300 MeV/c^(2),in a rapidity range from 2.0 to 4.5 and a transverse 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^(-))relative 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 heavy quark production