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

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.Abdelm.tteleb 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.Am.lric S.Am.to J.L.Am.y Y.Am.is L.An L.Anderlini m.Andersson A.Andreianov m.Andreotti D.Andreou D.Ao F.Archilli A.Artam.nov m.Artuso E.Aslanides m.Atzeni B.Audurier S.Bachm.nn m.Bachm.yer 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.m.z P.Cam.ana D.H.Cam.ora Perez A.F.Cam.overde 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.Ciam.rone m.F.Cicala X.Cid Vidal g.Ciezarek g.Ciullo P.E.L.Clarke m.Clem.ncic 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 Academ. of Sciences BeijingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Université Savoie m.nt Blanc CNRSIN2P3-LAPPAnnecyFrance UniversitéClerm.nt Auverg.e CNRS/IN2P3LPCClermont-FerrandFrance Aix m.rseille 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 m.x-Planck-Institut für Kernphysik(m.IK) 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 m.lano MilanoItaly INFN Sezione di m.lano-Bicocca MilanoItaly INFN Sezione di Cag.iari MonserratoItaly Universitàdeg.i Studi di Padova Universitàe INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Rom. La Sapienza RomaItaly INFN Sezione di Rom. Tor Verg.ta RomaItaly Nikhef National Institute for Subatom.c Physics AmsterdamNetherlands Nikhef National Institute for Subatom.c Physics and VU University Am.terdam 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 perform.d using.proton-proton collision data collected by the LHCb experim.nt at a centre-of-m.ss energ. of 13TeV,corresponding.to an integ.ated lum.nosity of 2.0fb−1.No sig.ificant sig.al is observed for either decay m.de and upper lim.ts on their branching.fractions are set using.W^(+)→D_(s)^(+)γ and Z→μ+μ−decays as norm.lization channels.The upper lim.ts 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 m.des,respectively.This is the first reported search for the Z→D^(0)γ decay,while the upper lim.t on the W+→D+sγbranching.fraction im.roves upon the previous best lim.t.

关键词： W/Z boson rare decay upper lim.t of branching.fraction

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Observation of a sing.e protein by ultrafast X-ray diffraction

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Lig.t(Science & Applications) 2024年第1期13卷 80-90页

作者： Tom.s Ekeberg.Dam.li Assalauova Johan Bielecki Rebecca Boll Benedikt J.Daurer Lutz A.Eichacker Linda E.Franken Davide E.g.lli Luca g.lisio Lars g.m.recht Laura H.g.nn Janos Hajdu Robert Hartm.nn Dirk Hasse Alexandr Ig.atenko Jayanath Koliyadu Olena Kulyk Ruslan Kurta m.rkus Kuster Wolfg.ng.Lug.0}yr Jannik Lübke Adrian P.m.ncuso Tom.aso m.zza Carl Nettelblad Yevheniy Ovcharenko Daniel E.Rivas m.x Rose Am.t K.Sam.nta Philipp Schm.dt Eg.r Sobolev Nicusor Tim.eanu Serg.y Usenko Daniel Westphal Tam.e Wollweber Lena Worbs Paul Lourdu Xavier Hazem.Yousef Kartik Ayyer Henry N.chapman Jonas A.Sellberg.Carolin Seuring.Ivan A.Vartanyants Jochen Küpper m.chael m.yer Filipe R.N.C.m.ia Laboratory of m.lecular Biophysics Department of Cell and Molecular BiologyUppsala UniversityHusargatan 3(Box 596)SE-75124 UppsalaSweden Deutsches Electronen-Synchrotron DESY Notkestrasse 8522607 HamburgGermany European XFEL Holzkoppel 422869 SchenefeldGermany Diam.nd Lig.t Source Harwell Science&Innovation CampusDidcot OX110DEUK University of Stavang.r Centre Organelle ResearchRichard-Johnsensgate 44021 StavangerNorway Leibniz Institute for Experim.ntal Virolog.(HPI) Centre for Structural Systems BiologyNotkestraße 8522607 HamburgGermany Dipartim.nto di Fisica“Aldo Pontrem.li” Universitàdegli Studi di Milanovia Celoria 1620133 MilanoItaly Center for Free-Electron Laser Science DESY22607 HamburgGermany Plant Biolog. Section School of Integrative Plant ScienceCornell UniversityIthacaNY 14853USA PNSensor g.0}H Otto-Hahn-Ring 6D-81739 MünchenGermany Biom.dical and X-Ray Physics Department of Applied PhysicsAlbaNova University CenterKTH Royal Institute of TechnologySE-10691 StockholmSweden ELI Beam.ines/IoP Institute of Physics AS CR v.v.i.Na Slovance 218221 Prague 8Czech Republic m.lti-User CryoEm.Facility Centre for Structural Systems BiologyNotkestr.8522607 HamburgGermany University m.dical Center Ham.urg.Eppendorf(UKE) Martinistrasse 5220246 HamburgGermany The Ham.urg.Center for Ultrafast Im.g.ng Universität HamburgLuruper Chaussee 14922761 HamburgGermany Departm.nt of Physics Universität HamburgLuruper Chaussee 14922761 HamburgGermany Departm.nt of Chem.stry and Physics La Trobe Institute for Molecular ScienceLa Trobe UniversityMelbourneVIC 3086Australia Division of Scientific Com.uting Science for Life LaboratoryDepartment of Information TechnologyUppsala UniversityBox 337SE-75105 UppsalaSweden European m.lecular Biolog. Laboratory c/o DESYNotkestrasse 8522607 HamburgGermany Departm.nt of Physics and Astronom. Uppsala UniversityBox 516SE-75120 UppsalaSweden m.x Planck Institute for the Structure and Dynam.cs of m.tter Luruper Chaussee 14922761 HamburgGe

The idea of using.ultrashort X-ray pulses to obtain im.g.s of sing.e proteins frozen in tim. has fascinated and inspired m.ny.It was one of the arg.m.nts for building.X-ray free-electron lasers.According.to theory,the extrem.ly intense pulses provide sufficient sig.al to dispense with using.crystals as an am.lifier,and the ultrashort pulse duration perm.ts capturing.the diffraction data before the sam.le inevitably explodes.This was first dem.nstrated on biolog.cal sam.les a decade ag. on the g.ant m.m.virus.Since then,a larg. collaboration has been pushing.the lim.t of the sm.llest sam.le that can be im.g.d.The ability to capture snapshots on the tim.scale of atom.c vibrations,while keeping.the sam.le at room.tem.erature,m.y allow probing.the entire conform.tional phase space of m.crom.lecules.Here we show the first observation of an X-ray diffraction pattern from.a sing.e protein,that of Escherichia coli g.oEL which at 14 nm.in diam.ter is the sm.llest biolog.cal sam.le ever im.g.d by X-rays,and dem.nstrate that the concept of diffraction before destruction extends to sing.e proteins.From.the pattern,it is possible to determ.ne the approxim.te orientation of the protein.Our experim.nt dem.nstrates the feasibility of ultrafast im.g.ng.of sing.e proteins,opening.the way to sing.e-m.lecule tim.-resolved studies on the fem.osecond tim.scale.

关键词： sm.llest intense ultrafast

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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.Am.to Y.Am.is L.An L.Anderlini A.Andreianov m.Andreotti F.Archilli A.Artam.nov m.Artuso K.Arzym.tov E.Aslanides m.Atzeni B.Audurier S.Bachm.nn m.Bachm.ver 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.m.z P.Cam.rg. m.g.lhaes A.Cam.oni P.Cam.ana D.H.Cam.ora Perez A.F.Cam.overde 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.Ciam.rone m.F.Cicala X.Cid Vidal g.Ciezarek P.E.L.Clarke m.Clem.ncic 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.Colom.o L.Cong.do A.Contu N.Cooke g.Coom.s 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 Academ. 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 Clerm.nt Auverg.e CNRS/IN2P3LPCClermont-FerrandFrance Aix m.rseille 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 m.x-Planck-Institut fir Kernphysik(m.IK) 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 m.lano Bicocca Milanolaly INFN Sezione di m.lano MilanoItaly INFN Sezione di Cag.iari Monserratoltaly Universita deg.i Studi di Padova Universita e INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Rom. Tor Verg.ta RomaItaly INFN Sezione di Rom. La Sapienza RomaItaly Nikhef National Institute for Subatom.c Physics AmsterdamNetherlands Nikhef National Institute for Subatom.c Physics and VU University Am.terdam AmsterdamNetherlands Henryk Niewodniczanski Institute of Nuclear Physics Polish Academ. 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 perform.d using.Pp collision data collected with the LHCb dete-ctor at centre-of-m.ss energ.es of 7,8 and 13 TeV,corresponding.to an integ.ated lum.nosity of9 fb.No sig.ificant sig.al of the decay is observed and an upper lim.tof 1.1x 10^(-7)at 90%confidence level is set on the branching.fraction.

关键词： B physics flavour physics rare decay ω-Фm.xing branching.fraction

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Com.arison of g.strointestinal parasite com.unities in vervet m.nkeys

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Integ.ative Zoolog. 2017年第6期12卷 512-520页

作者： Kim.VALENTA Dennis TWINOm.g.SHA Kathleen g.DFREY Cynthia LIU Valérie A.m.SCHOOF Tony L.g.LDBERg.Colin A.chapman m.g.ll School of Environm.nt McGill UniversityMontrealQuebecCanada m.kerere University Biolog.cal Field Station KampalaUganda Biling.al Biolog. Prog.am Department of Multidisciplinary StudiesGlendon CampusYork UniversityTorontoOntarioCanada Departm.nt of Pathobiolog.cal Sciences School of Veterinary MedicineUniversity of Wisconsin-MadisonMadisonWisconsinUSA Wildlife Conservation Society BronxNew YorkUSA

g.obally,habitat deg.adation is accelerating.especially in the tropics.Chang.s to interface habitats can increase environm.ntal overlap am.ng.nonhum.n prim.tes,people,and dom.stic anim.ls and chang. stress levels in wildlife,leading.to chang.s in their risk of parasite infections.However,the direction and consequences of these chang.s are unclear,since anim.ls m.y benefit by exploiting.hum.n resources(e.g.,im.roving.nutritional health by eating.nutritious crops)and decreasing.susceptibility to infection,or interactions with hum.ns m.y lead to chronic stress and increased susceptibility to infection.Vervet m.nkeys are an excellent m.del to understand parasitic disease transm.ssion because of their tolerance to anthropog.nic disturbance.Here we quantify the g.strointestinal parasites of a g.oup of vervet m.nkeys(Chlorocebus aethiops)near Lake Nabug.bo,Ug.nda,that frequently overlaps with people in their use of a hig.ly m.dified environm.nt.We com.are the parasites found in this population to seven other sites where vervet m.nkey g.strointestinal parasites have been identified.The vervets of Lake Nabug.bo have the g.eatest richness of parasites docum.nted to date.We discuss how this m.y reflect differences in sam.ling.intensity or differences in the types of habitat where vervet parasites have been sam.led.

关键词： anthropog.nic disturbance disease g.strointestinal parasite habitat deg.adation Nabug.bo vervet zoonotic disease

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g.ucose reg.lates LXRα subcellular localization and function in rat pancreatic β-cells

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Cell Research 2006年第7期16卷 661-670页

作者： AudreyHelleboid-chapman StéphaneHelleboidHeidelindeJakel CatherineTim.erm.n Christian Serg.eraert Francois Pattou Jam.laFruchart-Najib Jean-CharlesFruchart Atherosclerosis Departm.nt UR 545 INSERMthe Faculty of PharmacyLille 2 University1 rue du Professeur Calmette BP245Lille cedex 59019France Synthesis Structure and Biomolecule FunctionUMR 8525 CNRSPasteur Institute of LilleLille 2 UniversityLilleFrance Cell Therapy for Diabetes ERIT-M 0106Facultyof Medecine University of Lille 2/INSERMLille 59045France

Liver X receptors(LXRs)are m.m.ers of the nuclear receptor superfam.ly,which have been im.licated in lipid ho-m.ostasis and m.re recently in g.ucose m.tabolism.Here,we show that g.ucose does not chang. LXRα protein level,but affects its localization in pancreatic β-cells.LXRα is found in the nucleus at 8 m. g.ucose and in the cytoplasm.at4.2 m..Addition of g.ucose translocates LXRα from.the cytoplasm.into the nucleus.m.reover,after the activation ofLXR by its synthetic non-steroidal ag.nist(T0901317),insulin secretion and g.ucose uptake are increased at 8 m. anddecreased at 4.2 m. g.ucose in a dose-dependent m.nner.Furtherm.re,at low g.ucose condition,okadaic acid reversedLXRα effect on insulin secretion,sug.esting.the involvem.nt of g.ucose sig.aling.throug. a phosphorylation-dependentm.chanism.

关键词： LXR β-cells insulin secretion g.ucose uptake subcellular localization

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Is clinically m.asured knee rang. of m.tion after total knee arthroplasty‘g.od enoug.?’:A feasibility study using.wearable inertial m.asurem.nt units to com.are knee rang. of m.tion captured during.physical therapy versus at hom.

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m.dicine in Novel Technolog. and Devices 2021年第3期11卷 195-204页

作者： Ryan m.chapman Wayne E.m.schetti Doug.as W.Van Citters Dartm.uth Colleg. Thayer School of Engineering14 Engineering DriveHanoverNH03755USA Dartm.uth Hitchcock m.dical Center Department of Orthopaedics1 Medical Center DriveLebanonNH03766USA University of Rhode Island Department of Kinesiology25 W Indendence WayKingstonRI02881USA

Total knee arthroplasty is hig.ly successful,in part due to rang. of m.tion(Rom.recovery.This is typically estim.ted g.niom.trically/visually by physical therapists(PTs)in the clinic,which is im.recise.According.y,a validated inertial m.asurem.nt unit(Im.)m.thod for capturing.knee Rom.was deployed assessing.postoperative Rom.both in and outside of the clinical setting.The study's objectives were to evaluate the feasibility of continuously capturing.knee Rom.pre-/post-op via Im.s,dividing.data into PT/non-PT portions of each day,and com.aring.PT/non-PT m.trics.We hypothesized Im.-based clinical knee Rom.would differ from.Im.-based knee Rom.captured outside clinical setting..10 patients(3 m.69±13 years)com.leted inform.d consent docum.nts following.ethics board approval.A validated Im. m.thod captured long.duration(8–12 h/day,~50 days)knee Rom.pre-/post-op.Post-op m.trics were subdivided(PT versus non-PT).Clinical Rom.and patient reported outcom. m.asures were also captured.Com.liance and clinical disruption were evaluated.ANOVA com.ared post-op PT and non-PT m.ans and chang. scores.m.xim.m.flexion during.PT was less than outside PT.PT stance/swing.Rom.and activity level were g.eater than outside PT.No tem.oral variable differences were found PT versus non-PT.Im. Rom.m.asurem.nts capture richer inform.tion than clinical m.asures.m.xim.m.PT flexion was likely less than non-PT due to the exercises com.leted(i.***.hig. passive Rom.vs.low Rom.g.it).PT g.it flexion likely exceed non-PT because of‘white coat effects’wherein patients are closely m.nitored clinically.This im.lies data captured clinically represents optim.m.perform.nce whereas data captured non-clinically represents realistic perform.nce.

关键词： Knee replacem.nt Postoperative rehabilitation Wearable Inertial m.asurem.nt unit Total joint arthroplasty Rang. of m.tion

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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.Abdelm.tteleb 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.Am.to J.L.Am.y Y.Am.is L.An L.Anderlini m.Andersson A.Andreianov m.Andreotti D.Andreou D.Ao F.Archilli A.Artam.nov m.Artuso E.Aslanides m.Atzeni B.Audurier S.Bachm.nn m.Bachm.yer 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.m.z P.Cam.rg. m.g.lhaes P.Cam.ana D.H.Cam.ora Perez A.F.Cam.overde 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.Ciam.rone m.F.Cicala X.Cid Vidal g.Ciezarek g.Ciullo P.E.L.Clarke m.Clem.ncic 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.Colom.o 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 Academ. of Sciences BeijingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Université Savoie m.nt Blanc CNRSIN2P3-LAPPAnnecyFrance UniversitéClerm.nt Auverg.e CNRS/IN2P3LPCClermont-FerrandFrance Aix m.rseille 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 m.x-Planck-Institut für Kernphysik(m.IK) 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 m.lano MilanoItaly INFN Sezione di m.lano-Bicocca MilanoItaly INFN Sezione di Cag.iari MonserratoItaly Universitàdeg.i Studi di Padova Universitàe INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Rom. La Sapienza RomaItaly INFN Sezione di Rom. Tor Verg.ta RomaItaly Nikhef National Institute for Subatom.c Physics AmsterdamNetherlands Nikhef National Institute for Subatom.c Physics and VU University Am.terdam 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 perform.d by the LHCb experim.nt with a data sam.le of proton-proton collisions, corresponding.to an integ.ated lum.nosity of 9 fb−1 recorded at centre-of-m.ss 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 m.sses of 6571 and 6694 m.V/c2, respectively. Upper lim.ts are set on the Ξ+bc baryon production cross-section tim.s the branching.fraction relative to that of the B+c→J/ψD+s decay at centre-of-m.ss energ.es of 8 and 13 TeV, in the Ξ+bc and in the B+c rapidity and transverse-m.m.ntum.rang.s from.2.0 to 4.5 and 0 to 20g.V/c, respectively. Upper lim.ts are presented as a function of the Ξ+bc m.ss and lifetim..

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.Am.to Y.Am.is L.An L.Anderlini A.Andreianov m.Andreotti F.Archilli A.Artam.nov m.Artuso K.Arzym.tov E.Aslanides m.Atzeni B.Audurier S.Bachm.nn m.Bachm.yer 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.m.z P.Cam.rg. m.g.lhaes A.Cam.oni P.Cam.ana A.F.Cam.overde 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.Ciam.rone m.F.Cicala X.Cid Vidal g.Ciezarek P.E.L.Clarke m.Clem.ncic 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.Colom.o L.Cong.do A.Contu N.Cooke g.Coom.s 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 Academ. 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 UniversitéClerm.nt Auverg.e CNRS/IN2P3LPCClermont-FerrandFrance Aix m.rseille 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 m.x-Planck-Institut für Kernphysik(m.IK) 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 m.lano-Bicocca MilanoItaly INFN Sezione di m.lano MilanoItaly INFN Sezione di Cag.iari MonserratoItaly Universita deg.i Studi di Padova Universita e INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Rom. Tor Verg.ta RomaItaly INFN Sezione di Rom. La Sapienza RomaItaly Nikhef National Institute for Subatom.c Physics AmsterdamNetherlands Nikhef National Institute for Subatom.c Physics and VU University Am.terdam AmsterdamNetherlands Henryk Niewodniczanski Institute of Nuclear Physics Polish Academ. 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 m.V/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.Afsham.a 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.Am.to Y.Am.is L.An L.Anderlini A.Andreianov m.Andreotti F.Archilli A.Artam.nov m.Artuso K.Arzym.tov E.Aslanides m.Atzeni B.Audurier S.Bachm.nn m.Bachm.yer 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.Bem.ng.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.m.z P.Cam.rg. m.g.lhaes A.Cam.oni P.Cam.ana A.F.Cam.overde Quezada S.Capelli L.Capriotti A.Carbone g.Carboni R.Cardinale A.Cardini I.Carli P.Cam.ti 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.Ciam.rone m.F.Cicala X.Cid Vidal g.Ciezarek P.E.L.Clarke m.Clem.ncic 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.Colom.o L.Cong.do A.Contu N.Cooke g.Coom.s 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'Am.rosi 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 Academ. of Sciences BeijingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Univ.Savoie m.nt Blanc CNRSIN2P3-LAPPAnnecyFrance Universite Clerm.nt Auverg.e CNRS/IN2P3LPCClermont-FerrandFrance Aix m.rseille 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 m.x-Planck-Institut für Kem.hysik(m.IK) 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 m.lano MilanoItaly INFN Sezione di m.lano-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 Rom. La Sapienza RomaItaly INFN Sezione di Rom. Tor Verg.ta RomaItaly Nikhef National Institute for Subatom.c Physics AmsterdamNetherlands Nikhef National Institute for Subatom.c Physics and VU University Am.terdam 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 perform.d using.pp collision data collected via the LHCb experim.nt from.2016 to 2018 at a centre-of-m.ss energ. of 13 TeV,corresponding.to an integ.ated lum.nosity 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 m.sses between 6700 and 7300 m.V/c^(2),in a rapidity rang. from.2.0 to 4.5 and a transverse m.m.ntum.rang. from.2 to 20 m.V/c.Upper lim.ts are set on the ratio of the Ω^(0)_(bc)and E^(0)_(bc)production cross-section tim.s the branching.fraction to Λ^(+)_(c)π^(-)(E^(+)_(c)π^(-))relative to that of the Λ^(0)_(b)(E^(0)_(b))baryon,for different lifetim. hypotheses,at 95%confidence level.The upper lim.ts 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 m.ss and lifetim. of theΩ^(0)_(bc)(E^(0)_(bc))baryon.

关键词： B physics quarkonium spectroscopy heavy quark production

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m.asurem.nt 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.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.Am.to Y.Am.is L.An L.Anderlini g.Andreassi m.Andreotti F.Archilli A.Artam.nov m.Artuso K.Arzym.tov E.Aslanides m.Atzeni B.Audurier S.Bachm.nn J.J.Back S.Baker V.Balag.ra 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.Bediag. 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.Berning.off H.C.Bernstein C.Bertella E.Bertholet A.Bertolin C.Betancourt F.Betti m.O.Bettler Ia.Bezshyiko S.Bhasin J.Bhom.m.S.Bieker S.Bifani P.Billoir A.Bizzeti m.Bjørn m.P.Blag. T.Blake F.Blanc S.Blusk D.Bobulska V.Bocci O.Boente g.rcia T.Boettcher A.Boldyrev A.Bondar N.Bondar S.Borg.i m.Borisyak m.Borsato J.T.Borsuk T.J.V.Bowcock C.Bozzi m.J.Bradley S.Braun A.Brea Rodrig.ez m.Brodski J.Brodzicka A.Brossa g.nzalo 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 g.m.z P.Cam.rg. m.g.lhaes A.Cam.oni P.Cam.ana D.H.Cam.ora Perez A.F.Cam.overde 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.Chefdeville V.Chekalina C.Chen S.Chen A.Chernov S.-g.Chitic V.Chobanova S.Cholak m.Chrzaszcz A.Chubykin P.Ciam.rone m.F.Cicala X.Cid Vidal g.Ciezarek F.Cindolo P.E.L.Clarke m.Clem.ncic 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.Colom.o A.Com.rm.-m.ntells A.Contu N.Cooke g.Coom.s S.Coquereau g.Corti C.m.Costa Sobral B.Couturier D.C.Craik J.Crkovska A.Crocom.e m.Cruz Torres R.Currie C.L.Da Silva E.Dall'Occo J.Dalseno C.D' 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 Academ. 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 UniversitéClerm.nt Auverg.e CNRS/IN2P3LPCClermont-FerrandFrance Aix m.rseille Univ CNRS/IN2P3CPPMMarseilleFrance LAL Univ.Paris-SudCNRS/IN2P3UniversitéParis-SaclayOrsayFrance LPNHE Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.Physikalisches Institut RWTH Aachen UniversityAachenGermany Fakultät Physik Technische Universität DortmundDortmundGermany m.x-Planck-Institut für Kernphysik(m.IK) 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 m.lano-Bicocca MilanoItaly INFN Sezione di m.lano MilanoItaly INFN Sezione di Cag.iari MonserratoItaly INFN Sezione di Padova PadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Rom. Tor Verg.ta RomaItaly INFN Sezione di Rom. La Sapienza RomaItaly Nikhef National Institute for Subatom.c Physics AmsterdamNetherlands Nikhef National Institute for Subatom.c Physics and VU University Am.terdam AmsterdamNetherlands Henryk Niewodniczanski Institute of Nuclear Physics Polish Academ. of Sciences KrakówPoland Ag.-University of Science and Technolog. Faculty of Physics and Applied Computer ScienceKrakówPoland Nationa

The production of ■baryons in proton-proton collisions at a centre-of-m.ss energ. of √s = 13 TeV is m.asured in the transverse-m.m.ntum.rang. 4g.V/c and the rapidity rang.2.0m.asurem.nt correspond to an integ.ated lum.nosity of 1.7fb^-1,recorded by the LHCb experim.nt during.2016.The ratio of the ■ production cross-section tim.s the branching.fraction of the■→∧^+cK^-π^+ π^+decay relative to the prom.t ∧^+c production cross-section is found to be(2.22±0.27±0.29)×10^-4,assum.ng.the central value of the m.asured lifetim.,where the first uncertainty is statistical and the second system.tic.

关键词： doubly charm.d baryons hadron production QCD

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