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■^(−)_(b)→J/ψΛK^(−)衰变中一个J/ψΛ结构的迹象与■^(−)激发态的发现

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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.Adeva M.Adinolf. H.Af.harnia C.A.Aidala S.Aiola Z.Ajaltouni S.Akar J.Albrecht f.Alessio M.Alexander A.Alf.nso 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 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.Belavin S.Belin V.Bellee K.Belous I.Belov I.Belyaev G.Bencivenni E.Ben-Haim A.Berezhnoy *** D.Berninghof. 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.Bif.ni 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.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.Calef.ce 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.Chef.eville 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.Clif. 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’ Centro Brasileiro de Pesquisas f.sicas(CBPf. Rio de JaneiroBrazil Universidade f.deral do Rio de Janeiro(Uf.J) Rio de JaneiroBrazil Center f.r 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 UniversitéClermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance UniversitéParis-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprince-ringuet(llr) PalaiseauFrance LPNHE Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.Physikalisches Institut RWTH Aachen UniversityAachenGermany f.kultät Physik Technische Universität DortmundDortmundGermany Max-Planck-Institut f.r Kernphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universität HeidelbergHeidelbergGermany School of.Physics University College DublinDublinIreland INf. Sezione di Bari BariItaly INf. Sezione di Bologna BolognaItaly INf. Sezione di f.rrara FerraraItaly INf. Sezione di f.renze FirenzeItaly INf. Laboratori Nazionali di f.ascati FrascatiItaly INf. Sezione di Genova GenovaItaly INf. Sezione di Milano-Bicocca MilanoItaly INf. Sezione di Milano MilanoItaly INf. Sezione di Cagliari MonserratoItaly Universita degli Studi di Padova Universita e INFNPadovaPadovaItaly INf. Sezione di Pisa PisaItaly INf. Sezione di Roma Tor Vergata RomaItaly INf. Sezione di Roma La Sapienza RomaItaly Nikhef.National Institute f.r Subatomic Physics AmsterdamNetherlands Nikhef.National Institute f.r Subatomic Physics and VU University Amsterdam AmsterdamNetherlands Henryk Niewodniczanski Institute of.Nuclear Physics Polish Academy of.Sciences KrakówPoland AGH-University of.Science and Techno

夸克和胶子组成的粒子统称强子,其中包含4个或以上组分夸克的强子被称为奇异强子.目前实验上发现的奇异强子最多包含5个夸克,称为五夸克态.对五夸克态的深入研究可以检验对强相互作用的理解.利用质心能量为7、8和13 TeV,总积分亮度9 f.^... 详细信息

夸克和胶子组成的粒子统称强子,其中包含4个或以上组分夸克的强子被称为奇异强子.目前实验上发现的奇异强子最多包含5个夸克,称为五夸克态.对五夸克态的深入研究可以检验对强相互作用的理解.利用质心能量为7、8和13 TeV,总积分亮度9 f.^(−1)的质子-质子对撞数据,大型强子对撞机底夸克实验(LHCb)采用全谱分析的方法,研究了■^(−)_(b)→J/ψΛK^(−)衰变过程中的共振态结构.实验发现J/ψΛ系统中存在质量约为4.46 MeV/c^(2)的共振结构存在的迹象,其显著程度为3.1倍标准偏差,性质与五夸克态相符.这是实验上首次观测到包含奇异夸克的五夸克态的存在证据,为五夸克态的理论研究和后续的实验探索提供了重要的依据.除此之外,实验还精细测量了ΛK−系统中部分共振态的共振参数,精度远高于当前世界平均值,这对加深传统重子谱学的认识有着重要的意义.

关键词：大型强子对撞机强相互作用五夸克态共振结构奇异夸克强子组分夸克重子谱

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Search f.r 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.Adinolf. P.Adlarson H.Af.harnia C.Agapopoulou C.A.Aidala Z.Ajaltouni S.Akar K.Akiba J.Albrecht f.Alessio M.Alexander A.Alf.nso 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.Berninghof. 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.Bif.ni 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.Calef.ce 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.Chef.eville 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.Clif. J.Closier J.L.Cobbledick V.Coco J.A.B.Coelho J.Cogan E.Cognera Centro Brasileiro de Pesquisas f.sicas(CBPf. Rio de JaneiroBrazil Universidade f.deral do Rio de Janeiro(Uf.J) Rio de JaneiroBrazil Center f.r 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 f.kultat Physik Technische Universitat DortmundDortmundGermany Max-Planck-Institut f.r Kernphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of.Physics University College DublinDublinIreland INf. Sezione di Bari BariItaly INf. Sezione di Bologna BolognaItaly INf. Sezione di f.rrara FerraraItaly INf. Sezione di f.renze FirenzeItaly INf. Laboratori Nazionali di f.ascati FrascatiItaly INf. Sezione di Genova GenovaItaly INf. Sezione di Milano MilanoItaly INf. Sezione di Milano-Bicocca MilanoItaly INf. Sezione di Cagliari MonserratoItaly Universitàdegli Studi di Padova Universitàe INFNPadovaPadovaItaly INf. Sezione di Pisa PisaItaly INf. Sezione di Roma La Sapienza RomaItaly INf. Sezione di Roma Tor Vergata RomaItaly Nikhef.National Institute f.r Subatomic Physics AmsterdamNetherlands Nikhef.National Institute f.r Subatomic Physics and VU University Amsterdam AmsterdamNetherlands AGH-University of.Science and Technology Faculty of Physics and Applied Computer Scienc

A search f.r the rare decays W^(+)→D_(s)^(+)γ and Z→D0γis perf.rmed using proton-proton collision data collected by the LHCb experiment at a centre-of.mass energy of.13TeV,corresponding to an integrated luminosity of.2.0f.−1.No signif.cant signal is observed f.r either decay mode and upper limits on their branching f.actions are set using W^(+)→D_(s)^(+)γ and Z→μ+μ−decays as normalization channels.The upper limits are 6.5×10^(−4) and 2.1×10^(−3) at 95% conf.dence level f.r the W^(+)→D_(s)^(+)γ and Z→D^(0)γ decay modes,respectively.This is the f.rst reported search f.r the Z→D^(0)γ decay,while the upper limit on the W+→D+sγbranching f.action improves upon the previous best limit.

关键词： W/Z boson rare decay upper limit of.branching f.action

Search f.r the doubly heavy baryons Ωbc~0 and Ξbc~0 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.Adinolf. H.Af.harnia C.A.Aidala S.Aiola Z.Ajaltouni S.Akar J.Albrecht f.Alessio M.Alexander A.Alf.nso 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.Berninghof. H.C.Bernstein C.Bertella A.Bertolin C.Betancourt f.Betti Ia.Bezshyiko S.Bhasin J.Bhom L.Bian M.S.Bieker S.Bif.ni 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.Calef.ce 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.Chef.eville 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.Clif. 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 AGH-University of.Science and Technology Faculty of Computer Science Electronics and Telecommunications AGH-University of.Science and Technology Faculty of Physics and Applied Computer Science Aix Marseille Univ CNRS/IN2P3 CPPM Budker Institute of.Nuclear Physics (SB RAS) Cavendish Laboratory University of Cambridge Center f.r High Energy Physics Tsinghua University Centro Brasileiro de Pesquisas f.sicas (CBPf. DS4DS La Salle Universitat Ramon Llull Departamento de f.sica Universidad Nacional de Colombia Department of.Physics and Astronomy University of Manchester Department of.Physics and Astronomy Uppsala University Department of.Physics University of Oxford Department of.Physics University of Warwick European Organization f.r Nuclear Research (CERN) f.kult?t Physik Technische Universit?t Dortmund Guangdong Provencial Key Laboratory of.Nuclear Science Institute of Quantum Matter South China Normal University H.H. Wills Physics Laboratory University of Bristol Hangzhou Institute f.r Advanced Study UCAS Hanoi University of.Science Henryk Niewodniczanski Institute of.Nuclear Physics Polish Academy of.Sciences Horia Hulubei National Institute of.Physics and Nuclear Engineering I.Physikalisches Institut RWTH Aachen University ICCUB Universitat de Barcelona INf. Laboratori Nazionali di f.ascati INf. Sezione di Bari INf. Sezione di Bologna INf. Sezione di Cagliari INf. Sezione di f.rrara INf. Sezione di f.renze INf. Sezione di Genova INf. Sezione di Milano INf. Sezione di Milano-Bicocca INf. Sezione di Perugia INf. Sezione di Pisa INf. Sezione di Roma La Sapienza INf. Sezione di Roma Tor Vergata Imperial College London Institut f.r Physik Universit?t Rostock Institute Of.High Energy Physics (IHEP) Institute f.r High Energy Physics NRC Kurchatov Institute (IHEP NRC KI) Institute f.r Nuclear Research of.the National Academy of.Sciences (KINR) Institute f.r Nuclear Research of.the Russian Academy of.Sciences (INR RAS) Institute of.Nuclear Physics Moscow State University (SINP MSU) Institute of.Part

The f.rst search f.r the doubly heavy Ωbc~0 baryon and a search f.r the Ξbc~0 baryon are perf.rmed using pp collision data collected via the LHCb experiment f.om 2016 to 2018 at a centre-of.mass energy of.13 TeV,corresponding to an integrated luminosity of.5.2 f.-1.The baryons are reconstructed via their decays to ∧c~+π~-andΞc~+π~-.No signif.cant excess is f.und f.r invariant masses between 6700 and 7300 MeV/c2,in a rapidity range f.om2.0 to 4.5 and a transverse momentum range f.om 2 to 20 MeV/c.Upper limits are set on the ratio of.the Ωbc~0 andΞbc~0 production cross-section times the branching f.action to ∧c~+π~-(Ξc~+π~-) relative to that of.the ∧b~0(Ξb~0) baryon,f.r dif.erent lif.time hypotheses,at 95% conf.dence level.The upper limits range f.om 0.5×10-4to 2.5×10-4f.r theΩbc~0→∧c~+π~-(Ξbc~0→∧c~+π~-) decay,and f.om 1.4×10-3to 6.9×10-3f.r the Ωbc~0→Ξc~+π~-(Ξbc~0→Ξc~+π~-) decay,depending on the considered mass and lif.time of.the Ωbc~0(Ξbc~0) baryon.

关键词： B physics quarkonium spectroscopy heavy quark production

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.Adeva M.Adinolf. H.Af.harnia C.A.Aidala S.Aiola Z.Ajaltouni S.Akar P.Albicocco J.Albrecht f.Alessio M.Alexander A.Alf.nso Albero G.Alkhazov P.Alvarez Cartelle A.A.Alves 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.Belavin S.Belin V.Bellee K.Belous I.Belyaev G.Bencivenni E.Ben-Haim S.Benson S.Beranek A.Berezhnoy *** D.Berninghof. 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.Bif.ni 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.Butkevich J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese 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 L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini I.Carli P.Carniti K.Carvalho Akiba A.Casais Vidal G.Casse M.Cattaneo G.Cavallero S.Celani R.Cenci J.Cerasoli M.G.Chapman M.Charles Ph.Charpentier G.Chatzikonstantinidis M.Chef.eville V.Chekalina C.Chen S.Chen A.Chernov S.-G.Chitic V.Chobanova S.Cholak M.Chrzaszcz A.Chubykin P.Ciambrone M.f.Cicala X.Cid Vidal G.Ciezarek f.Cindolo P.E.L.Clarke M.Clemencic H.V.Clif. 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' Centro Brasileiro de Pesquisas f.sicas(CBPf. Rio de JaneiroBrazil Universidade f.deral do Rio de Janeiro(Uf.J) Rio de JaneiroBrazil Center f.r 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 UniversitéClermont Auvergne 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 f.kultät Physik Technische Universität DortmundDortmundGermany Max-Planck-Institut f.r Kernphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universität HeidelbergHeidelbergGermany School of.Physics University College DublinDublinIreland INf. Sezione di Bari BariItaly INf. Sezione di Bologna BolognaItaly INf. Sezione di f.rrara FerraraItaly INf. Sezione di f.renze FirenzeItaly INf. Laboratori Nazionali di f.ascati FrascatiItaly INf. Sezione di Genova GenovaItaly INf. Sezione di Milano-Bicocca MilanoItaly INf. Sezione di Milano MilanoItaly INf. Sezione di Cagliari MonserratoItaly INf. Sezione di Padova PadovaItaly INf. Sezione di Pisa PisaItaly INf. Sezione di Roma Tor Vergata RomaItaly INf. Sezione di Roma La Sapienza RomaItaly Nikhef.National Institute f.r Subatomic Physics AmsterdamNetherlands Nikhef.National Institute f.r Subatomic Physics and VU University Amsterdam AmsterdamNetherlands Henryk Niewodniczanski Institute of.Nuclear Physics Polish Academy of.Sciences KrakówPoland AGH-University 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 transverse-momentum range 4 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 transverse-momentum range 4f.1.7f.^-1,recorded by the LHCb experiment during 2016.The ratio of.the ■ production cross-section times the branching f.action of.the■→∧^+cK^-π^+ π^+decay relative to the prompt ∧^+c production cross-section is f.und to be(2.22±0.27±0.29)×10^-4,assuming the central value of.the measured lif.time,where the f.rst uncertainty is statistical and the second systematic.

关键词： doubly charmed baryons hadron production QCD

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Search f.r 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.Adinolf. H.Af.harnia C.Agapopoulou C.A.Aidala S.Aiola Z.Ajaltouni S.Akar K.Akiba J.Albrecht f.Alessio M.Alexander A.Alf.nso 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.Berninghof. 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.Bif.ni 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.Calef.ce 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.Chef.eville 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.Clif. 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 f.sicas(CBPf. Rio de JaneiroBrazil Universidade f.deral do Rio de Janeiro(Uf.J) Rio de JaneiroBrazil Center f.r 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 f.kultät Physik Technische Universität DortmundDortmundGermany Max-Planck-Institut f.r Kernphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universität HeidelbergHeidelbergGermany School of.Physics University College DublinDublinIreland INf. Sezione di Bari BariItaly INf. Sezione di Bologna BolognaItaly INf. Sezione di f.rrara FerraraItaly INf. Sezione di f.renze FirenzeItaly INf. Laboratori Nazionali di f.ascati FrascatiItaly INf. Sezione di Genova GenovaItaly INf. Sezione di Milano MilanoItaly INf. Sezione di Milano-Bicocca MilanoItaly INf. Sezione di Cagliari MonserratoItaly Universitàdegli Studi di Padova Universitàe INFNPadovaPadovaItaly INf. Sezione di Pisa PisaItaly INf. Sezione di Roma La Sapienza RomaItaly INf. Sezione di Roma Tor Vergata RomaItaly Nikhef.National Institute f.r Subatomic Physics AmsterdamNetherlands Nikhef.National Institute f.r Subatomic Physics and VU University Amsterdam AmsterdamNetherlands AGH-University of.Science and Technology Faculty of Physics and Applied Computer Scienc

A f.rst search f.r the Ξ_(bc)^(+)J/ψΞ_(c)^(+) decay is perf.rmed by the LHCb experiment with a data sample of.proton-proton collisions, corresponding to an integrated luminosity of.9 f.−1 recorded at centre-of.mass energies of.7, 8, and 13 TeV. Two peaking structures are seen with a local (global) signif.cance 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 f.action 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 f.om 2.0 to 4.5 and 0 to 20GeV/c, respectively. Upper limits are presented as a f.nction of.the Ξ+bc mass and lif.time.

关键词： QCD B physics charm physics spectroscopy

Search f.r 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.Adinolf. H.Af.hamia C.A.Aidala S.Aiola Z.Ajaltouni S.Aka J.Albrecht f.Alessio M.Alexander A.Alf.nso 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.Beminghof. H.C.Bernstein C.Bertella A.Bertolin C.Betancourt f.Betti Ia.Bezshyiko S.Bhasin J.Bhom L.Bian M.S.Bieker S.Bif.ni 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.Calef.ce 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.Chef.eville 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.Clif. 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 f.sicas(CBPf. Rio de JaneiroBrazil Universidade f.deral do Rio de Janeiro(Uf.J) Rio de JaneiroBrazil Center f.r 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.hinese 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 f.kultat Physik Technische Universitat DortmundDortmundGermany Max-Planck-Institut f.r Kemphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of.Physics University College DublinDublinIreland INf. Sezione di Bari BariItaly INf. Sezione di Bologna BolognaItaly INf. Sezione di f.rrara FerraraItaly INf. Sezione di f.renze FirenzeItaly INf. Laboratori Nazionali di f.ascati FrascatiItaly INf. Sezione di Genova GenovaItaly INf. Sezione di Milano MilanoItaly INf. Sezione di Milano-Bicocca MilanoItaly INf. Sezione di Cagliari MonserratoItaly Universita degli Studi di Padova Universita e INFNPadovaPadovaItaly INf. Sezione di Pisa PisaItaly INf. Sezione di Roma La Sapienza RomaItaly INf. Sezione di Roma Tor Vergata RomaItaly Nikhef.National Institute f.r Subatomic Physics AmsterdamNetherlands Nikhef.National Institute f.r Subatomic Physics and VU University Amsterdam AmsterdamNetherlands AGH-University of.Science and Technology Faculty of Physics and Applied Computer ScienceKr

The f.rst search f.r the doubly heavyΩ^(0)_(bc)baryon and a search f.r the E^(0)_(bc)baryon are perf.rmed using pp collision data collected via the LHCb experiment f.om 2016 to 2018 at a centre-of.mass energy of.13 TeV,corresponding to an integrated luminosity of.5.2 f.^(-1).The baryons are reconstructed via their decays to Λ^(+)_(c)π^(-)and E^(+)_(c)π^(-).No signif.cant excess is f.und f.r invariant masses between 6700 and 7300 MeV/c^(2),in a rapidity range f.om 2.0 to 4.5 and a transverse momentum range f.om 2 to 20 MeV/c.Upper limits are set on the ratio of.the Ω^(0)_(bc)and E^(0)_(bc)production cross-section times the branching f.action to Λ^(+)_(c)π^(-)(E^(+)_(c)π^(-))relative to that of.the Λ^(0)_(b)(E^(0)_(b))baryon,f.r dif.erent lif.time hypotheses,at 95%conf.dence level.The upper limits range f.om 0.5 x 10^(-4)to 2.5 x 10^(-4)f.r theΩ^(0)_(bc)→Λ^(+)_(c)π^(-)(E^(0)_(bc)→Λ^(+)_(c)π^(-))decay,and f.om 1.4x 10^(-3)to 6.9 x 10^(-3)f.r theΩ^(0)_(bc)→E^(+)_(c)π^(-)(E^(0)_(bc)→E^(+)_(c)π^(-))decay,depending on the considered mass and lif.time of.theΩ^(0)_(bc)(E^(0)_(bc))baryon.

关键词： B physics quarkonium spectroscopy heavy quark production

Search f.r 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.Adinolf. H.Af.harnia C.A.Aidala S.Aiola Z.Ajaltouni S.Akar P.Albicocco J.Albrecht f.Alessio M.Alexander A.Alf.nso 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.Berninghof. H.C.Bernstein E.Bertholet A.Bertolin C.Betancourt f.Betti M.O.Bettler Ia.Bezshyiko S.Bhasin J.Bhom M.S.Bieker S.Bif.ni 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.Chef.eville 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.Clif. 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 f.ancisco K.De Bruyn S.De Capua M Centro Brasileiro de Pesquisas f.sicas(CBPf. Rio de JaneiroBrazil Universidade f.deral do Rio de Janeiro(Uf.J) Rio de JaneiroBrazil Center f.r 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 f.kultat Physik Technische Universitat DortmundDortmundGermany Max-Planck-Institut f.r Kernphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of.Physics University College DublinDublinIreland INf. Sezione di Bari BariItaly INf. Sezione di Bologna BolognaItaly INf. Sezione di f.rrara FerraraItaly INf. Sezione di f.renze FirenzeItaly INf. Laboratori Nazionali di f.ascati FrascatiItaly INf. Sezione di Genova GenovaItaly INf. Sezione di Milano-Bicocca MilanoItaly INf. Sezione di Milano MilanoItaly INf. Sezione di Cagliari MonserratoItaly INf. Sezione di Padova PadovaItaly INf. Sezione di Pisa PisaItaly INf. Sezione di Roma Tor Vergata RomaItaly INf. Sezione di Roma La Sapienza RomaItaly Nikhef.National Institute f.r Subatomic Physics AmsterdamNetherlands Nikhef.National Institute f.r 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 f.r the doubly charmed baryon ■^+cc is perf.rmed through its decay to theΛ^+c K^-π^+ f.nal state,using proton-proton collision data collected with the LHCb detector at centre-of.mass energies of.7,8 and 13 TeV.The data correspond to a total integrated luminosity of.9 f.^-1.No signif.cant signal is observed in the mass range f.om 3.4 to 3.8 GeV/c^2.Upper limits are set at 95%credibility level on the ratio of.the ■^+cc production cross-section times the branching f.action to that of.^+c and ■^++cc baryons.The limits are determined as f.nctions of.the ■^+cc mass f.r dif.erent lif.time hypotheses,in the rapidity range f.om 2.0 to 4.5 and the transverse momentum range f.om 4 to 15 GeV/c.

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

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