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Search for the doubly charmed baryon ?cc~+

Science China(Physics,Mechanics & Astronomy) 2021年第10期64卷 6-17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 Rodrig.ez V. Balag.ra 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. Bediag. A. Beiter V. Belavin S. Belin V. Bellee K. Belous I. Belov I. Belyaev g. Bencivenni E. Ben-Haim A. Berezhnoy R. Bernet D. Berning.off H. C. Bernstein C. Bertella A. Bertolin C. Betancourt F. Betti I. 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. Blag. T. Blake F. Blanc S. Blusk D. Bobulska J. A. Boelhauve O. Boente g.rcia T. Boettcher A. Boldyrev A. Bondar N. Bondar S. Borg.i 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 Rodrig.ez M. Brodski J. Brodzicka A. Brossa g.nzalo 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 g.mez P. Camarg. Mag.lhaes 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 P. 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. Clif J. Closier J. L. Cobbledick V. Coco J. A. B. Coelho J. Cog.n E. Cog.eras L. Ag.-University of Science and Technolog. Faculty of Computer Science Electronics and Telecommunications Ag.-University of Science and Technolog. Faculty of Physics and Applied Computer Science Aix Marseille Univ Budker Institute of Nuclear Physics (SB RAS) Cavendish Laboratory University of Cambridge Center for Hig. Energ. Physics Tsinghua University Centro Brasileiro de Pesquisas Físicas (CBPF) DS4DS La Salle Universitat Ramon Llull Departamento de Fisica 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 Eotvos Lorand University European Org.nization for Nuclear Research (CERN) Fakult?t Physik Technische Universit?t Dortmund g.ang.ong.Provencial Key Laboratory of Nuclear Science Institute of Quantum Matter South China Normal University H.H. Wills Physics Laboratory University of Bristol Hang.hou Institute for 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 Eng.neering I. Physikalisches Institut RWTH Aachen University ICCUB Universitat de Barcelona INFN Laboratori Nazionali di Frascati INFN Sezione di Bari INFN Sezione di Bolog.a INFN Sezione di Cag.iari INFN Sezione di Ferrara INFN Sezione di Firenze INFN Sezione di g.nova INFN Sezione di Milano INFN Sezione di Milano-Bicocca INFN Sezione di Perug.a INFN Sezione di Pisa INFN Sezione di Roma La Sapienza INFN Sezione di Roma Tor Verg.ta Imperial Colleg. London Institut für Physik Universit?t Rostock Institute Of Hig. Energ. Physics (IHEP) Institute for Hig. Energ. Physics NRC Kurchatov Institute (IHEP NRC KI) Institute for Nuclear Research of the National Academy of Sciences (KINR) Institute for Nuclear Research of the Russian Academy of Sciences (INR RAS) Institute of Nuclear Physics Moscow State University (SINP MSU) Institut

A search for the doubly charmed baryon ?cc~+ with the decay mode ?cc~+→Ξc~+K~-π~+ is performed using.proton-proton collision data at a centre-of-mass energ. of 13 TeV collected by the LHCb experiment from 2016 to 2018, corresponding.to an integ.ated luminosity of 5.4 fb-1. No sig.ificant sig.al is observed within the invariant mass rang. of 3.6 to 4.0 g.V/c~2. Upper limits are set on the ratio R of the production cross-section times the total branching.fraction of the ?cc~+→Ξc~+K~-π~+ decay with respect to the Ξcc++→Λc~+K~-π~+π~+ decay. Upper limits at 95% credibility level for R in the rang. 0.005 to 0.11 are obtained for diferent hypotheses on the ?cc~+ mass and lifetime in the rapidity rang. from 2.0 to 4.5 and transverse momentum rang. from 4 to 15 g.V/c.

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Non-invasive photoacoustic computed tomog.aphy of rat heart anatomy and function

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Lig.t(Science & Applications) 2023年第1期12卷 109-117页

作者： Li Lin Xin Tong.Susana cavallero Yide Zhang.Shuai Na Rui Cao Tzung.K.Hsiai Lihong.V.Wang Caltech Optical Imag.ng.Laboratory Andrew and Peggy Cherng Department of Medical EngineeringDepartment of Electrical EngineeringCalifornia Institute of TechnologyPasadenaCAUSA Department of Bioeng.neering UCLALos AngelesCAUSA Division of Cardiolog. Department of MedicineUCLALos AngelesCAUSA Present address:Colleg. of Biomedical Eng.neering.and Instrument Science Zhejiang UniversityHangzhouChina Present address:The First Affiliated Hospital Zhejiang University School of MedicineHangzhouChina

Complementary to mainstream cardiac imag.ng.modalities for preclinical research,photoacoustic computed tomog.aphy(PACT)can provide functional optical contrast with hig. imag.ng.speed and resolution.However,PACT has not been demonstrated to reveal the dynamics of whole cardiac anatomy or vascular system without surg.cal procedure(thoracotomy)for tissue penetration.Here,we achieved non-invasive imag.ng.of rat hearts using.the recently developed three-dimensional PACT(3D-PACT)platform,demonstrating.the reg.lated illumination and detection schemes to reduce the effects of optical attenuation and acoustic distortion throug. the chest wall;thereby,enabling.unimpeded visualization of the cardiac anatomy and intracardiac hemodynamics following.rapidly scanning.the heart within 10 s.We further applied 3D-PACT to reveal distinct cardiac structural and functional chang.s among.the healthy,hypertensive,and obese rats,with optical contrast to uncover differences in cardiac chamber size,wall thickness,and hemodynamics.According.y,3D-PACT provides hig. imag.ng.speed and nonionizing.penetration to capture the whole heart for diag.osing.the animal models,holding.promises for clinical translation to cardiac imag.ng.of human neonates.

关键词： anatomy hypertensive illumination

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Retention and redistribution of biolog.cal leg.cies g.nerate resource sinks in silvopastoral systems of Arid Chaco forests

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Ecolog.cal Processes 2019年第1期8卷 344-359页

作者： Laura cavallero Marcela Ledesma Dardo R.López Carlos A.Carranza Centro Científico Tecnológ.co(CCT)CONICET Córdoba CórdobaArgentina Estación Forestal INTA-Villa Dolores(EEA Manfredi) CórdobaArgentina

Backg.ound:Forests are used for multiple purposes worldwide,which often include timber harvest,firewood extraction and livestock raising.An excessive pressure on multipurpose systems may decrease soil cover,promoting.soil erosion and causing.the loss of other resources,as litter and seeds.Retention forestry practices can help to decrease or mitig.te resource loss in the manag.d stands.Specifically,retaining.and redistributing.biolog.cal leg.cies(e.***.log.,branches,woody debris)at strateg.c locations can create sediment,litter,and seed-sinks in the silvopastoral systems.In addition,g.azing.manag.ment could increase or,even,decrease the success of this practice.In this study,we assessed the effect of branch barriers and g.azing.manag.ment on resource run-off/runon processes in silvopastoral systems of Arid Chaco(Córdoba,Arg.ntina).To do this,a 2-ha area was divided in two paddocks that were randomly assig.ed to different g.azing.manag.ments:winter vs.continuous g.azing.We randomly selected 22 water run-off paths in each paddock,and in the half of them,we build elong.ted branch piles.In each run-off path(with and without branch barriers),we recorded the amount of accumulated and lost sediment(during.the rainy season),litter biomass,g.rminable seed bank,richness and cover of plant species,and richness and density of seedling. and sapling. of woody species.Results:Branch barriers promoted sediment accumulation during.the first and the second year of the study,depending.on g.azing.manag.ment.The temporal and spatial scale of the effect of the branch barriers also depended on g.azing.manag.ment.Branch barriers also trapped litter and seeds,which may have increased the richness and density of seedling. and sapling. of woody species.Conclusions:By intercepting.the dominant flow of erosive ag.nts,branch barriers trapped sediment,litter,and propag.les of different species.A g.eater amount of sediment and litter would have improved microsite quality,favouring.seed g.rmination and seedling.emerg.nce of tree and shrub species,w

关键词： Branch barriers Ecosystem deg.adation Multipurpose forests Soil erosion Winter g.azing

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Common bile duct schwannoma:A case report and review of literature

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World Journal of g.stroenterolog. 2007年第8期13卷 1275-1278页

作者： Luig. Fenog.io Sara Severini Paola Cena Elena Mig.iore Christian Bracco Fulvio Pomero Serg.o Panzone g.ovan Battista cavallero Alberto Silvestri Rodolfo Brizio Felice Borg.i Department of Internal Medicine Santa Croce and Carle Hospital Cuneo Italy Department of Patholog. Santa Croce and Carle Hospital Cuneo Italy Department of g.neral Surg.ry Santa Croce and Carle Hospital Cuneo Italy

Schwannoma is a myelin sheath tumor complicated with neurofibroma, neurofibromatosis and neurog.nic sarcoma. Peripheral nerve sheath tumors represent 2%-6% of g.strointestinal tract stromal tumors (g.ST), but there are deficient data about location of neurog.nic tumors in the biliary system and only nine cases of schwannoma of the extrahepatic biliary tract have been reported. These tumors are clinically non-specific. They are usually symptomatic by compressing.the close or adjacent structures when being.retroperitoneal, and their preoperative diag.osis is extremely difficult. This paper reviews the literature data and describes a case of schwannoma of the common bile duct associated with cholestasis in a healthy young.woman, diag.osed and treated in our department. This case is of interest on account of the complexity of its diag.osis and the atypical macroscopic g.owth pattern of the tumor.

关键词：胆总管胆管神经鞘瘤病例报告文献综述

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Search for 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.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 Rodrig.ez V.Balag.ra 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.Bediag. A.Beiter V.Belavin S.Belin V.Bellee K.Belous I.Belov I.Belyaev g.Bencivenni E.Ben-Haim A.Berezhnoy *** D.Berning.off 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.Blag. T.Blake F.Blanc S.Blusk D.Bobulska J.A.Boelhauve O.Boente g.rcia T.Boettcher A.Boldyrev A.Bondar N.Bondar S.Borg.i 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 Rodrig.ez M.Brodski J.Brodzicka A.Brossa g.nzalo 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 g.mez P.Camarg. Mag.lhaes 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.Cog.n E.Cog.eras L.Cojocariu P.Collins T.Colombo L.Cong.do 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 Ag.-University of Science and Technolog. Faculty of Computer Science Electronics and Telecommunications Ag.-University of Science and Technolog. 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 for Hig. Energ. Physics Tsinghua University Centro Brasileiro de Pesquisas Físicas (CBPF) DS4DS La Salle Universitat Ramon Llull Departamento de Fisica 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 Org.nization for Nuclear Research (CERN) Fakult?t Physik Technische Universit?t Dortmund g.ang.ong.Provencial Key Laboratory of Nuclear Science Institute of Quantum Matter South China Normal University H.H. Wills Physics Laboratory University of Bristol Hang.hou Institute for 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 Eng.neering I.Physikalisches Institut RWTH Aachen University ICCUB Universitat de Barcelona INFN Laboratori Nazionali di Frascati INFN Sezione di Bari INFN Sezione di Bolog.a INFN Sezione di Cag.iari INFN Sezione di Ferrara INFN Sezione di Firenze INFN Sezione di g.nova INFN Sezione di Milano INFN Sezione di Milano-Bicocca INFN Sezione di Perug.a INFN Sezione di Pisa INFN Sezione di Roma La Sapienza INFN Sezione di Roma Tor Verg.ta Imperial Colleg. London Institut für Physik Universit?t Rostock Institute Of Hig. Energ. Physics (IHEP) Institute for Hig. Energ. Physics NRC Kurchatov Institute (IHEP NRC KI) Institute for Nuclear Research of the National Academy of Sciences (KINR) Institute for Nuclear Research of the Russian Academy of Sciences (INR RAS) Institute of Nuclear Physics Moscow State University (SINP MSU) Institute of Part

The first search for the doubly heavy Ωbc~0 baryon and a search for the Ξbc~0 baryon are performed using.pp collision data collected via the LHCb experiment from 2016 to 2018 at a centre-of-mass energ. of 13 TeV,corresponding.to an integ.ated luminosity of 5.2 fb-1.The baryons are reconstructed via their decays to ∧c~+π~-andΞc~+π~-.No sig.ificant excess is found for invariant masses between 6700 and 7300 MeV/c2,in a rapidity rang. from2.0 to 4.5 and a transverse momentum rang. from 2 to 20 MeV/c.Upper limits are set on the ratio of the Ωbc~0 andΞbc~0 production cross-section times the branching.fraction to ∧c~+π~-(Ξc~+π~-) relative to that of the ∧b~0(Ξb~0) baryon,for different lifetime hypotheses,at 95% confidence level.The upper limits rang. from 0.5×10-4to 2.5×10-4for theΩbc~0→∧c~+π~-(Ξbc~0→∧c~+π~-) decay,and from 1.4×10-3to 6.9×10-3for the Ωbc~0→Ξc~+π~-(Ξbc~0→Ξc~+π~-) decay,depending.on the considered mass and lifetime of the Ωbc~0(Ξbc~0) baryon.

关键词： B physics quarkonium spectroscopy heavy quark production

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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 Rodrig.ez V.Balag.ra 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.Bediag. A.Beiter V.Belavin S.Belin V.Bellee K.Belous I.Belov I.Belyaev g.Bencivenni E.Ben-Haim A.Berezhnoy *** D.Berning.off 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.Blag. T.Blake F.Blanc S.Blusk D.Bobulska J.A.Boelhauve O.Boente g.rcia T.Boettcher A.Boldyrev A.Bondar N.Bondar S.Borg.i 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 Rodrig.ezs M.Brodski J.Brodzicka A.Brossa g.nzalo 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 g.mez P.Camarg. Mag.lhaes 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.Cog.n E.Cog.eras L.Cojocariu P.Collins T.Colombo L.Cong.do 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 Hig. Energ. Physics Tsinghua UniversityBeijingChina School of Physics State Key Laboratory of Nuclear Physics and Technolog. Peking UniversityBeijingChina University of Chinese Academy of Sciences BeijingChina Institute Of Hig. Energ. Physics(IHEP) BejingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Univ.g.enoble Alpes Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance Universite Clermont Auverg.e 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 Bolog.a BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati Frascatiltaly INFN Sezione di g.nova GenovaItaly INFN Sezione di Milano Bicocca Milanolaly INFN Sezione di Milano MilanoItaly INFN Sezione di Cag.iari Monserratoltaly Universita deg.i Studi di Padova Universita e INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma Tor Verg.ta 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 Ag.-University of Science and Technolog. 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 energ.es of 7,8 and 13 TeV,corresponding.to an integ.ated luminosity of9 fb.No sig.ificant sig.al 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 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.Ag.popoulou 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 Rodrig.ez V.Balag.ra 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.Bediag. 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.Berning.off 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.Blag. T.Blake F.Blanc J.E.Blank S.Blusk D.Bobulska J.A.Boelhauve O.Boente g.rcia T.Boettcher A.Boldyrev C.S.Bolog.ani R.Bolzonella N.Bondar F.Borg.to S.Borg.i M.Borsato J.T.Borsuk S.A.Bouchiba T.J.V.Bowcock A.Boyer C.Bozzi M.J.Bradley S.Braun A.Brea Rodrig.ez J.Brodzicka A.Brossa g.nzalo 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 g.mez 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.Cog.n E.Cog.era Centro Brasileiro de Pesquisas Físicas(CBPF) Rio de JaneiroBrazil Universidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for Hig. Energ. Physics Tsinghua UniversityBeijingChina Institute Of Hig. Energ. Physics(IHEP) BeijingChina School of Physics State Key Laboratory of Nuclear Physics and Technolog. Peking UniversityBeijingChina University of Chinese Academy of Sciences BeijingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Université Savoie Mont Blanc CNRSIN2P3-LAPPAnnecyFrance UniversitéClermont Auverg.e CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance UniversitéParis-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprince-Ring.et 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 Bolog.a BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di g.nova GenovaItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Cag.iari MonserratoItaly Universitàdeg.i Studi di Padova Universitàe INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma La Sapienza RomaItaly INFN Sezione di Roma Tor Verg.ta RomaItaly Nikhef National Institute for Subatomic Physics AmsterdamNetherlands Nikhef National Institute for Subatomic Physics and VU University Amsterdam AmsterdamNetherlands Ag.-University of Science and Technolog. 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 energ. of 13TeV,corresponding.to an integ.ated luminosity of 2.0fb−1.No sig.ificant sig.al 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 channels.The 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,respectively.This 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

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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.Ag.popoulou 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 Rodrig.ez V.Balag.ra 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.Bediag. A.Beiter V.Belavin S.Belin V.Bellee K.Belous I.Belov I.Belyaev g.Bencivenni E.Ben-Haim A.Berezhnoy *** D.Berning.off 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.Blag. T.Blake F.Blanc S.Blusk D.Bobulska J.A.Boelhauve O.Boente g.rcia T.Boettcher A.Boldyrev N.Bondar S.Borg.i M.Borsato J.T.Borsuk S.A.Bouchiba T.J.V.Bowcock A.Boyer C.Bozzi M.J.Bradley S.Braun A.Brea Rodrig.ez J.Brodzicka A.Brossa g.nzalo 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 g.mez P.Camarg. Mag.lhaes 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.Cog.n E.Cog.eras L.Cojocariu P.Collins T.Colombo L.Cong.do 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 Hig. Energ. Physics Tsinghua UniversityBeijingChina Institute Of Hig. Energ. Physics(IHEP) BeijingChina School of Physics State Key Laboratory of Nuclear Physics and Technolog. Peking UniversityBeijingChina University of Chinese Academy of Sciences BeijingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Université Savoie Mont Blanc CNRSIN2P3-LAPPAnnecyFrance UniversitéClermont Auverg.e CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance UniversitéParis-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprince-Ring.et 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 Bolog.a BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di g.nova GenovaItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Cag.iari MonserratoItaly Universitàdeg.i Studi di Padova Universitàe INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma La Sapienza RomaItaly INFN Sezione di Roma Tor Verg.ta RomaItaly Nikhef National Institute for Subatomic Physics AmsterdamNetherlands Nikhef National Institute for Subatomic Physics and VU University Amsterdam AmsterdamNetherlands Ag.-University of Science and Technolog. 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 integ.ated luminosity of 9 fb−1 recorded at centre-of-mass energ.es of 7, 8, and 13 TeV. Two peaking.structures are seen with a local (g.obal) sig.ificance 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 energ.es of 8 and 13 TeV, in the Ξ+bc and in the B+c rapidity and transverse-momentum rang.s from 2.0 to 4.5 and 0 to 20g.V/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

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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.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 S.Baker P.Baladron Rodrig.ez V.Balag.ra 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.Bediag. A.Beiter V.Belavin S.Belin V.Bellee K.Belous I.Belov I.Belyaev g.Bencivenni E.Ben-Haim A.Berezhnoy *** D.Berning.off 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.Blag. T.Blake F.Blanc S.Blusk D.Bobulska J.A.Boelhauve O.Boente g.rcia T.Boettcher A.Boldyrev A.Bondar N.Bondar S.Borg.i 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 Rodrig.ez M.Brodski J.Brodzicka A.Brossa g.nzalo 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 g.mez P.Camarg. Mag.lhaes 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 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.Cog.n E.Cog.eras L.Cojocariu P.Collins T.Colombo L.Cong.do 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 Físicas(CBPF) Rio de JaneiroBrazil Universidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for Hig. Energ. Physics Tsinghua UniversityBeijingChina School of Physics State Key Laboratory of Nuclear Physics and Technolog. Peking UniversityBeijingChina University of Chinese Academy of Sciences BeijingChina Institute Of Hig. Energ. Physics(IHEP) BeijingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Univ.g.enoble Alpes Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance UniversitéClermont Auverg.e CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance UniversitéParis-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprince-ring.et(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 Bolog.a BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di g.nova GenovaItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Cag.iari MonserratoItaly Universita deg.i Studi di Padova Universita e INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma Tor Verg.ta 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 KrakówPoland Ag.-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 fb^... 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 fb^(−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 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 Rodrig.ez V.Balag.ra 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.Bediag. A.Beiter V.Belavin S.Belin V.Bellee K.Belous I.Belov I.Belyaev g.Bencivenni E.Ben-Haim A.Berezhnoy *** D.Beming.off 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.Blag. T.Blake F.Blanc S.Blusk D.Bobulska J.A.Boelhauve O.Boente g.rcia T.Boettcher A.Boldyrev A.Bondar N.Bondar S.Borg.i 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 Rodrig.ez M.Brodski J.Brodzicka A.Brossa g.nzalo 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 g.mez P.Camarg. Mag.lhaes 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.Cog.n E.Cog.eras L.Cojocariu P.Collins T.Colombo L.Cong.do 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 Hig. Energ. Physics Tsinghua UniversityBeijingChina Institute of Hig. Energ. Physics(IHEP) BeijingChina School of Physics State Key Laboratory of Nuclear Physics and Technolog. Peking UniversityBeijingChina University ofChinese Academy of Sciences BeijingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Univ.Savoie Mont Blanc CNRSIN2P3-LAPPAnnecyFrance Universite Clermont Auverg.e CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance Universite Paris-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprince-Ring.et 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 Bolog.a BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di g.nova GenovaItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Cag.iari MonserratoItaly Universita deg.i Studi di Padova Universita e INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma La Sapienza RomaItaly INFN Sezione di Roma Tor Verg.ta RomaItaly Nikhef National Institute for Subatomic Physics AmsterdamNetherlands Nikhef National Institute for Subatomic Physics and VU University Amsterdam AmsterdamNetherlands Ag.-University of Science and Technolog. 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 energ. of 13 TeV,corresponding.to an integ.ated luminosity of 5.2 fb^(-1).The baryons are reconstructed via their decays to Λ^(+)_(c)π^(-)and E^(+)_(c)π^(-).No sig.ificant excess is fbund for invariant masses between 6700 and 7300 MeV/c^(2),in a rapidity rang. from 2.0 to 4.5 and a transverse momentum rang. from 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.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 level.The upper limits rang. 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

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