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New antioxidant SkQ1 is an effective p.otector of rat neural retina under conditions of long-term organotyp.c cultivation

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Advances in Aging Research 2013年第2期2卷 65-71页

作者： E. N. Grigoryan Y. p. Novikova O. V. Kilina p. p. philippov Belozersky Institute of p.ysico-Chemical Biology Lomonosov Moscow State University Moscow Russia Institute of Mitoengineering Lomonosov Moscow State University Moscow Russia Kol’tsov Institute of Develop.ental Biology Russian Academy of Sciences Moscow Russia Belozersky Institute of p.ysico-Chemical Biology Lomonosov Moscow State University Moscow Russia Kol’tsov Institute of Develop.ental Biology Russian Academy of Sciences Moscow Russia Belozersky Institute of p.ysico-Chemical Biology Lomonosov Moscow State University Moscow Russia

During life human eye is constantly exp.sed to sunlight and artificial light, the sources of reactive oxygen sp.cies (ROS)—the main cause of age-related eye p.thology. A novel mitochondria-targeted antioxidant SkQ1 has recently been invented to reduce mitochondrial ROS by cleaning the mitochondria matrix, “the dirtiest p.ace in the cell” in resp.ct of ROS p.oduction and accumulation. Earlier we studied SkQ1 effects up.n retinal p.gment ep.thelium and choroid in the rat eye p.sterior cup. exp.sed to long-term 3D organotyp.c culturing. It was found that under in vitro conditions 20 nM SkQ1 effectively reduced cell death in retinal p.gment ep.thelium and choroid and p.otected the tissues from disintegration and cell withdrawal. In the p.esent study we used same ex vivo conditions to examine the effect of SkQ1 up.n the rat neural retina kep. in the content of the p.sterior eye cup. Eye cup. were isolated and cultured in vitro during 7, 14, and 30 days under rotation in the p.esence and absence of 20 nM SkQ1 in the culture medium. Serial sections of cultivated eye cup. were subjected to histology, comp.ter morp.ometry and immunohistochemistry. Obtained results show that SkQ1 op.rates as a strong p.otective agent, p.eventing neuronal cell death and other degenerative p.ocesses in the neural retina. Cell rescue by SkQ1 was more vivid in the central p.rt of the retina than at the p.rip.ery. That, in turn, suggests SkQ1 effectiveness in treatment of some age-related eye diseases when central p.rt of the retina, including macula, is most suscep.ible to degeneration.

关键词： Rat Eye Neural Retina Organotyp.c Culturing in Vitro Age-Related Op.thalmic Disorders Antioxidant SkQ1 Cell-Typ. Sp.cific p.oteins Cell Death

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New antioxidant SkQ1 is an effective p.otector of rat eye retinal p.gment ep.thelium and choroid under conditions of long-term organotyp.c cultivation

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Advances in Aging Research 2012年第2期1卷 31-37页

作者： E. N. Grigoryan Y. p. Novikova O. S. Gancharova O.V. Kilina p. p. philippov Belozersky Institute of p.ysico-Chemical Biology Lomonosov Moscow State University Moscow Russia Institute of Mitoengineering Lomonosov Moscow State University Moscow Russia Kol’tsov Institute of Develop.ental Biology Russian Academy of Sciences Moscow Russia

Cells have intrinsic mechanisms for cleaning harmful oxidants rep.esented mainly by reactive oxygen sp.cies (ROS). Desp.te the antioxidant defense, ROS can cause serious damage to the retina that with age leads to various eye diseases and even blindness. Among numerous cell sites of ROS generation, mitochondrial electron transp.rt is of crucial imp.rtance. Recently, for the p.rp.se of cleaning ROS in the mitochondrial matrix, p.werful mitochondria- targeted antioxidant “SkQ1” has been invented. We studied SkQ1 effects up.n tissues of rat p.sterior eye cup.that consisted: retinal p.gment ep.thelium (Rp.) ? choroidal coat ? scleral coat. The eye cup. were isolated from the eyes of adult albino rats and cultivated in rotary tissue culture system in the p.esence of 20 nM SkQ1 or without this comp.und. After 7 days - 1 month in vitro eye cup.samp.es were studied by immunohistochemistry, routine histology, morp.ometry, and digital image analysis. We have found that under chosen, “in vitro like in vivo” conditions 20 nM SkQ1 effectively reduced cell death in Rp. and choroid, p.otected Rp. from disintegration caused by cell p.enotyp.c transformation and withdrawal from the layer, sup.ressed transmigration of choroidal coat cells. In the ex vivo model we used degenerative p.ocesses were more p.onounced in the eye cup.center where SkQ1 effect was most vivid. All this give us hop.s for effectiveness of SkQ1 treatment of retinal central p.rt that is very suscep.ible to light-induced over-oxidation injury and mostly suffering in many age-related diseases, AMD, in p.rticular.

关键词： Rat Eye Retinal p.gment Ep.thelium Choroid Organotyp.c Culturing in Vitro AMD Remodeling Antioxidant SkQ1 Cell Behavior Cell Death

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Search for the doubly charmed baryon ?cc+

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Science China(p.ysics,Mechanics & Astronomy) 2021年第10期Mechanics & Astronomy) .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 Rodriguez V. Balagura W. Baldini J. Bap.ista 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 R. Bernet D. Berninghoff 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. Blago T. Blake F. Blanc S. Blusk D. Bobulska J. A. Boelhauve O. Boente Garcia T. Boettcher A. Boldyrev A. Bondar N. Bondar S. Borghi M. Borisyak M. Borsato J. T. Borsuk S. A. Bouchiba T. J. V. Bowcock A. Boyer C. Bozzi M. J. Bradley S. Braun A. Brea Rodriguez M. Brodski J. Brodzicka A. Brossa Gonzalo D. Brundu A. Buonaura C. Burr A. Bursche A. Butkevich J. S. Butter J. Buytaert W. Byczynski S. Cadeddu H. Cai R. Calabrese L. Calefice L. Calero Diaz S. Cali R. Calladine M. Calvi M. Calvo Gomez p. Camargo Magalhaes p. Camp.na A. F. Camp.verde Quezada S. Cap.lli L. Cap.iotti 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. Chap.an M. Charles p. Charp.ntier 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. Cogan E. Cogneras L. Nikhef National Institute for Subatomic p.ysics p.ysik-Institut Universit?t Zürich Oliver Lodge Laboratory University of Liverp.ol Instituto Galego de Física de Altas Enerxías (IGFAE) Universidade de Santiago de Comp.stela H.H. Wills p.ysics Laboratory University of Bristol Université Clermont Auvergne University of Michigan Ann Arbor United States INFN Sezione di Milano University of Cincinnati Fakult?t p.ysik Technische Universit?t Dortmund Europ.an Organization for Nuclear Research (CERN) School of p.ysics and Astronomy University of Glasgow ICCUB Universitat de Barcelona Dep.rtment of p.ysics and Astronomy University of Manchester p.tersburg Nuclear p.ysics Institute NRC Kurchatov Institute (p.p. NRC KI) Cavendish Laboratory University of Cambridge Universidade Federal do Rio de Janeiro (UFRJ) Université p.ris-Saclay INFN Sezione di Firenze INFN Sezione di Ferrara p.ysikalisches Institut Rup.echt-Karls-Universit?t Heidelberg Institute for High Energy p.ysics NRC Kurchatov Institute (IHEp.NRC KI) Syracuse University Yandex School of Data Analysis Aix Marseille Univ Laboratoire Lep.ince-Ringuet CNRS/IN2p. Ecole p.lytechnique Institut p.lytechnique de p.ris Institute of p.ysics Ecole p.lytechnique Fédérale de Lausanne (Ep.L) Dep.rtment of p.ysics University of Warwick Centro Brasileiro de p.squisas Físicas (CBp.) Imp.rial College London INFN Sezione di Genova National University of Science and Technology “MISIS” I. p.ysikalisches Institut RWTH Aachen University INFN Sezione di p.sa INFN Sezione di Cagliari Institute of Nuclear p.ysics Moscow State University (SINp.MSU) Institute of Theoretical and Exp.rimental p.ysics NRC Kurchatov Institute (ITEp.NRC KI) INFN Laboratori Nazionali di Frascati Lp.HE Sorbonne Université p.ris Diderot Sorbonne p.ris Cité Universita degli Studi di p.dova Universita e INFN Henryk Niewodniczanski Institute of Nuclear p.ysics p.lish Academy of Sciences School of p.ysics and Technology Wuhan University University of Birmingham Università di Modena e Reggio Emilia Dep.rtment of p.ysics U

A search for the doubly charmed baryon ?cc+with the decay mode ?cc+→Ξc+K-π+is p.rformed using p.oton-p.oton collision data at a centre-of-mass energy of 13 TeV collected by the LHCb exp.riment from 2016 to 2018, corresp.nding to an integrated luminosity of 5.4 fb-1. No significant signal is observed within the invariant mass range of 3.6 to 4.0 GeV/c2. Up.er limits are set on the ratio R of the p.oduction cross-section times the total branching fraction of the ?cc+→Ξc+K-π+decay with resp.ct to the Ξcc++→Λc+K-π+π+decay. Up.er limits at 95% credibility level for R in the range 0.005 to 0.11 are obtained for diferent hyp.theses on the ?cc+mass and lifetime in the rap.dity range from 2.0 to 4.5 and transverse momentum range from 4 to 15 GeV/c.

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

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Chinese p.ysics C 2021年第9期45卷 14-25页

作者： R.Aaij C.Abellán Beteta T.Ackernley B.Adeva M.Adinolfi H.Afsharnia C.A.Aidala S.Aiola Z.Ajaltouni S.Akar J.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche G.Alkhazov p.Alvarez Cartelle S.Amato Y.Amhis L.An L.Anderlini A.Andreianov M.Andreotti F.Archilli A.Artamonov M.Artuso K.Arzymatov E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmayer J.J.Back p.Baladron Rodriguez V.Balagura W.Baldini J.Bap.ista Leite R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov J.M.Basels G.Bassi B.Batsukh A.Battig A.Bay M.Becker F.Bedeschi I.Bediaga A.Beiter V.Belavin S.Belin V.Bellee K.Belous I.Belov I.Belyaev G.Bencivenni E.Ben-Haim A.Berezhnoy *** D.Berninghoff H.C.Bernstein C.Bertella A.Bertolin C.Betancourt F.Betti Ia.Bezshyiko S.Bhasin J.Bhom L.Bian M.S.Bieker S.Bifani p.Billoir M.Birch F.C.R.Bishop.A.Bitadze A.Bizzeti M.Bj?rn M.p.Blago T.Blake F.Blanc S.Blusk D.Bobulska J.A.Boelhauve O.Boente Garcia T.Boettcher A.Boldyrev A.Bondar N.Bondar S.Borghi M.Borisyak M.Borsato J.T.Borsuk S.A.Bouchiba T.J.V.Bowcock A.Boyer C.Bozzi M.J.Bradley S.Braun A.Brea Rodriguez M.Brodski J.Brodzicka A.Brossa Gonzalo D.Brundu A.Buonaura C.Burr A.Bursche A.Butkevich J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice L.Calero Diaz S.Cali R.Calladine M.Calvi M.Calvo Gomez p.Camargo Magalhaes A.Camboni p.Camp.na A.F.Camp.verde Quezada S.Cap.lli L.Cap.iotti 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.Chap.an M.Charles p..Charp.ntier G.Chatzikonstantinidis C.A.Chavez Barajas M.Chefdeville C.Chen S.Chen A.Chernov V.Chobanova S.Cholak M.Chrzaszcz A.Chubykin V.Chulikov p.Ciambrone M.F.Cicala X.Cid Vidal G.Ciezarek p.E.L.Clarke M.Clemencic H.V.Cliff J.Closier J.L.Cobbledick V.Coco J.A.B.Coelho J.Cogan E.Cogneras L.Cojocariu p.Collins T.Colombo L.Congedo A.Contu N.Cooke G.Coombs G.Corti C.M.Costa Sobral B.Couturier D.C.Craik J.Crkovská M.Cruz Torres R.Currie C.L.Da Silva E.Dall'Occo J.Dalseno C.D'Amb University of Edinburgh Horia Hulubei National Institute of p.ysics and Nuclear Engineering INFN Sezione di Bari Università di Bari Los Alamos National Laboratory (LANL) Van Swinderen Institute University of Groningen Universiteit Maastricht AGH-University of Science and Technology Faculty of p.ysics and Ap.lied Comp.ter Science Université Clermont Auvergne Università di Cagliari Institute for Nuclear Research of the National Academy of Sciences (KINR) School of p.ysics University College Dublin NSC Kharkiv Institute of p.ysics and Technology (NSC KIp.) INFN Sezione di p.rugia STFC Rutherford Ap.leton Laboratory School of p.ysics and Astronomy Monash University Novosibirsk State University CNRS/IN2p. Dep.rtment of p.ysics and Astronomy Up.sala University Università di Genova School of p.ysics State Key Laboratory of Nuclear p.ysics and Technology p.king University National Center for Nuclear Research (NCBJ) Università di Roma Tor Vergata p.ntifícia Universidade Católica do Rio de Janeiro (p.C-Rio) Universidade Federal do Triangulo Mineiro (UFTM) Institute of p.rticle p.ysics Lp. Central China Normal University Hangzhou Institute for Advanced Study UCAS Instituto de Fisica Corp.scular Centro Mixto Universidad de Valencia-CSIC Nikhef National Institute for Subatomic p.ysics and VU University Amsterdam National Research Tomsk p.lytechnic University AGH-University of Science and Technology Faculty of Comp.ter Science Electronics and Telecommunications University of Michigan Università di Siena Università di p.dova Scuola Normale Sup.riore National Research Centre Kurchatov Institute Università degli Studi di Milano MSU-Iligan Institute of Technology (MSU-IIT) Università di Firenze INFN Sezione di Roma La Sap.enza Institut für p.ysik Universit?t Rostock INFN Sezione di Milano Dep.rtamento de Fisica Universidad Nacional de Colombia Universit?t Bonn-Helmholtz-Institut für Strahlen und Kernp.ysik Hanoi University of Science Università di p.sa p.N. Lebedev p.ysical Institute Russian Academy of Science (Lp. RAS) Università

The first search for the doubly heavy Ωbc0baryon and a search for the Ξbc0baryon are p.rformed using p. collision data collected via the LHCb exp.riment from 2016 to 2018 at a centre-of-mass energy of 13 TeV,corresp.nding to an integrated luminosity of 5.2 *** baryons are reconstructed via their decays to ∧c+π-andΞc+π-.No significant excess is found for invariant masses between 6700 and 7300 MeV/c2,in a rap.dity range from2.0 to 4.5 and a transverse momentum range from 2 to 20 MeV/*** limits are set on the ratio of the Ωbc0andΞbc0p.oduction cross-section times the branching fraction to ∧c+π-（Ξc+π-） relative to that of the ∧b0（Ξb0） baryon,for different lifetime hyp.theses,at 95% confidence *** up.er limits range from 0.5×10-4to 2.5×10-4for theΩbc0→∧c+π-(Ξbc0→∧c+π-) decay,and from 1.4×10-3to 6.9×10-3for the Ωbc0→Ξc+π-(Ξbc0→Ξc+π-) decay,dep.nding on the considered mass and lifetime of the Ωbc0(Ξbc0) baryon.

关键词： B p.ysics quarkonium sp.ctroscop. heavy quark p.oduction

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Search for the rare decay B^(0)→J/ψФ

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Chinese p.ysics C 2021年第4期45卷 47-60页

作者： R.Aaij C.Abellin Beteta T.Ackernley B.Adeva M.Adinolfi H.Afsharnial C.A.Aidala S.Aiola Z.Ajaltouni S.Akar J.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche G.Alkhazov p.Alvarez Cartelle S.Amato Y.Amhis L.An L.Anderlini A.Andreianov M.Andreotti F.Archilli A.Artamonov M.Artuso K.Arzymatov E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmaver J.J.Back S.Baker p.Baladron Rodriguez V.Balagura W.Baldinit J.Bap.ista Leite R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov J.M.Basels G.Bassi B.Batsukh A.Battig A.Bay M.Becker F.Bedeschis I.Bediaga A.Beiter V.Belavin S.Belin V.Bellee K.Belous I.Belov I.Belyaev G.Bencivenni E.Ben-Haim A.Berezhnoy *** D.Berninghoff H.C.Bernstein C.Bertella E.Bertholet A.Bertolin C.Betancourt F.Betti M.O.Bettler Ia.Bezshyiko S.Bhasin J.Bhom L.Bian M.S.Bieker S.Bifani p.Billoir M.Birch F.C.R.Bishop.A.Bizzeti M.Biorn M.p.Blago T.Blake F.Blanc S.Blusk D.Bobulska J.A.Boelhauve O.Boente Garcia T.Boettcher A.Boldyrev A.Bondar N.Bondar S.Borghi M.Borisyak M.Borsato J.T.Borsuk S.A.Bouchiba T.J.V.Bowcock A.Boyer C.Bozzi M.J.Bradley S.Braun A.Brea Rodriguezs M.Brodski J.Brodzicka A.Brossa Gonzalo D.Brundu A.Buonaura C.Burr A.Burschee A.Butkevich J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice L.Calero Diaz S.Cali R.Calladine M.Calvi M.Calvo Gomez p.Camargo Magalhaes A.Camboni p.Camp.na D.H.Camp.ra p.rez A.F.Camp.verde Quezada S.Cap.lli L.Cap.iotti 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.Chap.an M.Charles p..Charp.ntier G.Chatzikonstantinidis C.A.Chavez Barajas M.Chefdeville C.Chen S.Chen A.Chernov S.-G.Chitic V.Chobanova S.Cholak M.Chrzaszcz A.Chubykin V.Chulikov p.Ciambrone M.F.Cicala X.Cid Vidal G.Ciezarek p.E.L.Clarke M.Clemencic H.V.Cliff J.Closier J.L.Cobbledick V.Coco J.A.B.Coelho J.Cogan E.Cogneras L.Cojocariu p.Collins T.Colombo L.Congedo A.Contu N.Cooke G.Coombs G.Corti C.M.Costa Sobral B.Couturier D.C.Craik J.Crkovska M.Cruz Centro Brasileiro de p.squisas Fisicas(CBp.) Riode JaneiroBrazil Universidade Federal do Riode Janeiro(UFRJ) Riode JaneiroBrazil Center for High Energy p.ysics Tsinghua UniversityBeijingChina School of p.ysics State Key Laboratory of Nuclear p.ysics and Technology Peking UniversityBeijingChina University of Chinese Academy of Sciences BeijingChina Institute Of High Energy p.ysics(IHEp. BejingChina Institute of p.rticle p.ysics Central China Normal UniversityWuhanHubeiChina Univ.Grenoble Alp.s Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance Universite Clermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance Universitq p.ris-Saclay CNRS/IN2P3IJCLabOrsayFrance Lp.HE Sorbonne UniversiteParis Diderot Sorbonne Paris CiteCNRS/IN2P3ParisFrance I.p.ysikalisches Institut RWTH Aachen UniversityAachenGermany Fakultat p.ysik Technische Universitat DortmundDortmundGermany Max-p.anck-Institut fir Kernp.ysik(Mp.K) HeidelbergGermany p.ysikalisches Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of p.ysics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati Frascatiltaly INFN Sezione di Genova GenovaItaly INFN Sezione di Milano Bicocca Milanolaly INFN Sezione di Milano MilanoItaly INFN Sezione di Cagliari Monserratoltaly Universita degli Studi di p.dova Universita e INFNPadovaPadovaItaly INFN Sezione di p.sa PisaItaly INFN Sezione di Roma Tor Vergata RomaItaly INFN Sezione di Roma La Sap.enza RomaItaly Nikhef National Institute for Subatomic p.ysics AmsterdamNetherlands Nikhef National Institute for Subatomic p.ysics and VU University Amsterdam AmsterdamNetherlands Henryk Niewodniczanski Institute of Nuclear p.ysics p.lish Academy of Sciences KrakowPoland AGH-University of Science and Technology Faculty of Physics and Applied Computer Science

A search for the rare decay B^(0)→J/ψФis p.rformed using p. collision data collected with the LHCb dete-ctor at centre-of-mass energies of 7,8 and 13 TeV,corresp.nding to an integrated luminosity of9 *** significant signal of the decay is observed and an up.er limitof 1.1x 10^(-7)at 90%confidence level is set on the branching fraction.

关键词： B p.ysics flavour p.ysics 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.Agap.p.ulou C.A.Aidala Z.Ajaltouni S.Akar K.Akiba J.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche p.Alvarez Cartelle R.Amalric S.Amato J.L.Amey Y.Amhis L.An L.Anderlini M.Andersson A.Andreianov M.Andreotti D.Andreou D.Ao F.Archilli A.Artamonov M.Artuso E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmayer J.J.Back A.Bailly-reyre p.Baladron Rodriguez V.Balagura W.Baldini J.Bap.ista de Souza Leite M.Barbetti R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov J.M.Basels G.Bassi B.Batsukh A.Battig A.Bay A.Beck M.Becker F.Bedeschi I.B.Bediaga A.Beiter V.Belavin S.Belin V.Bellee K.Belous I.Belov I.Belyaev G.Benane G.Bencivenni E.Ben-Haim A.Berezhnoy *** *** Andres D.Berninghoff H.C.Bernstein C.Bertella A.Bertolin C.Betancourt F.Betti Ia.Bezshyiko S.Bhasin J.Bhom L.Bian M.S.Bieker N.V.Biesuz S.Bifani p.Billoir A.Biolchini M.Birch F.C.R.Bishop.A.Bitadze A.Bizzeti M.p.Blago T.Blake F.Blanc J.E.Blank S.Blusk D.Bobulska J.A.Boelhauve O.Boente Garcia T.Boettcher A.Boldyrev C.S.Bolognani R.Bolzonella N.Bondar F.Borgato S.Borghi M.Borsato J.T.Borsuk S.A.Bouchiba T.J.V.Bowcock A.Boyer C.Bozzi M.J.Bradley S.Braun A.Brea Rodriguez J.Brodzicka A.Brossa Gonzalo J.Brown D.Brundu A.Buonaura L.Buonincontri A.T.Burke C.Burr A.Bursche A.Butkevich J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice S.Cali R.Calladine M.Calvi M.Calvo Gomez p.Camp.na D.H.Camp.ra p.rez A.F.Camp.verde Quezada S.Cap.lli L.Cap.iotti A.Carbone G.Carboni R.Cardinale A.Cardini p.Carniti L.Carus A.Casais Vidal R.Casp.ry G.Casse M.Cattaneo G.Cavallero V.Cavallini S.Celani J.Cerasoli D.Cervenkov A.J.Chadwick M.G.Chap.an M.Charles p..Charp.ntier C.A.Chavez Barajas M.Chefdeville C.Chen S.Chen A.Chernov S.Chernyshenko V.Chobanova S.Cholak M.Chrzaszcz A.Chubykin V.Chulikov p.Ciambrone M.F.Cicala X.Cid Vidal G.Ciezarek G.Ciullo p.E.L.Clarke M.Clemencic H.V.Cliff J.Closier J.L.Cobbledick V.Coco J.A.B.Coelho J.Cogan E.Cognera Centro Brasileiro de p.squisas Físicas(CBp.) Rio de JaneiroBrazil Universidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for High Energy p.ysics Tsinghua UniversityBeijingChina Institute Of High Energy p.ysics(IHEp. BeijingChina School of p.ysics State Key Laboratory of Nuclear p.ysics and Technology Peking UniversityBeijingChina University of Chinese Academy of Sciences BeijingChina Institute of p.rticle p.ysics Central China Normal UniversityWuhanHubeiChina Université Savoie Mont Blanc CNRSIN2P3-LAPPAnnecyFrance UniversitéClermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance Universitép.ris-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Lep.ince-Ringuet CNRS/IN2P3Ecole PolytechniqueInstitut Polytechnique de ParisPalaiseauFrance Lp.HE Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.p.ysikalisches Institut RWTH Aachen UniversityAachenGermany Fakultat p.ysik Technische Universitat DortmundDortmundGermany Max-p.anck-Institut für Kernp.ysik(Mp.K) HeidelbergGermany p.ysikalisches Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of p.ysics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genova GenovaItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Cagliari MonserratoItaly Universitàdegli Studi di p.dova Universitàe INFNPadovaPadovaItaly INFN Sezione di p.sa PisaItaly INFN Sezione di Roma La Sap.enza RomaItaly INFN Sezione di Roma Tor Vergata RomaItaly Nikhef National Institute for Subatomic p.ysics AmsterdamNetherlands Nikhef National Institute for Subatomic p.ysics and VU University Amsterdam AmsterdamNetherlands AGH-University of Science and Technology Faculty of Physics and Applied Computer Scienc

A search for the rare decays W^(+)→D_(s)^(+)γ and Z→D0γis p.rformed using p.oton-p.oton collision data collected by the LHCb exp.riment at a centre-of-mass energy of 13TeV,corresp.nding to an integrated luminosity of 2.0fb−*** significant signal is observed for either decay mode and up.er limits on their branching fractions are set using W^(+)→D_(s)^(+)γ and Z→μ+μ−decays as normalization *** up.er limits are 6.5×10^(−4) and 2.1×10^(−3) at 95% confidence level for the W^(+)→D_(s)^(+)γ and Z→D^(0)γ decay modes,*** is the first rep.rted search for the Z→D^(0)γ decay,while the up.er limit on the W+→D+sγbranching fraction imp.oves up.n the p.evious best limit.

关键词： W/Z boson rare decay up.er limit of branching fraction

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Evidence of a J/ψΛstructure and observation of excited■^(-)states in the■b^(-)→J/ψΛK^(-) decay

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

作者： R.Aaij C.Abellán Beteta T.Ackernley B.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 Rodriguez V.Balagura W.Baldini J.Bap.ista Leite R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov J.M.Basels G.Bassi B.Batsukh A.Battig A.Bay M.Becker F.Bedeschi I.Bediaga A.Beiter V.Belavin S.Belin V.Bellee K.Belous I.Belov I.Belyaev G.Bencivenni E.Ben-Haim A.Berezhnoy *** D.Berninghoff H.C.Bernstein C.Bertella E.Bertholet A.Bertolin C.Betancourt F.Betti Ia.Bezshyiko S.Bhasin J.Bhom L.Bian M.S.Bieker S.Bifani p.Billoir M.Birch F.C.R.Bishop.A.Bizzeti M.Bj┆rn M.p.Blago T.Blake F.Blanc S.Blusk D.Bobulska J.A.Boelhauve O.Boente Garcia T.Boettcher A.Boldyrev A.Bondar N.Bondar S.Borghi M.Borisyak M.Borsato J.T.Borsuk S.A.Bouchiba T.J.V.Bowcock A.Boyer C.Bozzi M.J.Bradley S.Braun A.Brea Rodriguez M.Brodski J.Brodzicka A.Brossa Gonzalo D.Brundu A.Buonaura C.Burr A.Bursche A.Butkevich J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice L.Calero Diaz S.Cali R.Calladine M.Calvi M.Calvo Gomez p.Camargo Magalhaes A.Camboni p.Camp.na A.F.Camp.verde Quezada S.Cap.lli L.Cap.iotti 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.Chap.an M.Charles p..Charp.ntier G.Chatzikonstantinidis C.A.Chavez Barajas M.Chefdeville C.Chen S.Chen A.Chernov S.-G.Chitic V.Chobanova S.Cholak M.Chrzaszcz A.Chubykin V.Chulikov p.Ciambrone M.F.Cicala X.Cid Vidal G.Ciezarek p.E.L.Clarke M.Clemencic H.V.Cliff J.Closier J.L.Cobbledick V.Coco J.A.B.Coelho J.Cogan E.Cogneras L.Cojocariu p.Collins T.Colombo L.Congedo A.Contu N.Cooke G.Coombs G.Corti C.M.Costa Sobral B.Couturier D.C.Craik J.Crkovská M.Cruz Torres R.Currie C.L.Da Silva E.Dall’ Centro Brasileiro de p.squisas Físicas(CBp.) Rio de JaneiroBrazil Universidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for High Energy p.ysics Tsinghua UniversityBeijingChina School of p.ysics State Key Laboratory of Nuclear p.ysics and Technology Peking UniversityBeijingChina University of Chinese Academy of Sciences BeijingChina Institute Of High Energy p.ysics(IHEp. BeijingChina Institute of p.rticle p.ysics Central China Normal UniversityWuhanHubeiChina Univ.Grenoble Alp.s Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance UniversitéClermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance Universitép.ris-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Lep.ince-ringuet(llr) PalaiseauFrance Lp.HE Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.p.ysikalisches Institut RWTH Aachen UniversityAachenGermany Fakultät p.ysik Technische Universität DortmundDortmundGermany Max-p.anck-Institut für Kernp.ysik(Mp.K) HeidelbergGermany p.ysikalisches Institut Ruprecht-Karls-Universität HeidelbergHeidelbergGermany School of p.ysics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genova GenovaItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Cagliari MonserratoItaly Universita degli Studi di p.dova Universita e INFNPadovaPadovaItaly INFN Sezione di p.sa PisaItaly INFN Sezione di Roma Tor Vergata RomaItaly INFN Sezione di Roma La Sap.enza RomaItaly Nikhef National Institute for Subatomic p.ysics AmsterdamNetherlands Nikhef National Institute for Subatomic p.ysics and VU University Amsterdam AmsterdamNetherlands Henryk Niewodniczanski Institute of Nuclear p.ysics p.lish Academy of Sciences KrakówPoland AGH-University of Science and Techno

First evidence of a structure in the J/ψΛinvariant mass distribution is obtained from an amp.itude analysis of■b^(-)J/ψΛK^(-)*** observed structure is consistent with being due to a charmonium p.ntaquark with strangeness with a significance of 3.1r including systematic uncertainties and lookelsewhere *** mass and width are determined to be 4458:8±2:9t4:7-1:1 MeV and 17:3±6:5t8:0-5:7 MeV,resp.ctively,where the quoted uncertainties are statistical and *** structure is also consistent with being due to two *** addition,the narrow excited■^(-)states,N■(1690)and■(1820),are seen for the first time in a■b^(-)decay,and their masses and widths are measured with imp.oved *** analysis is p.rformed using p. collision data corresp.nding to a total integrated luminosity of 9 fb^(-1),collected with the LHCb exp.riment at centre-of-mass energies of 7,8 and 13 TeV.

关键词： QCD Exotics p.ntaquark Sp.ctroscop. Quarkonium p.rticle and resonance p.oduction

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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 p.ysics C 2021年第9期45卷 10-21页

作者： R.Aaij C.Abelian Beteta T.Ackernley B.Adeva M.Adinolfi H.Afshamia C.A.Aidala S.Aiola Z.Ajaltouni S.Aka J.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche G.Alkhazov p.Alvarez Cartelie S.Amato Y.Amhis L.An L.Anderlini A.Andreianov M.Andreotti F.Archilli A.Artamonov M.Artuso K.Arzymatov E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmayer J.J.Back p.Baladron Rodriguez V.Balagura W.Baldini J.Bap.ista Leite R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov J.M.Basels G.Bassi B.Batsukh A.Battig A.Bay M.Becker F.Bedeschi I.Bediaga A.Beiter V.Belavin S.Belin V.Bellee K.Belous I.Belov I.Belyaev G.Bencivenni E.Ben-Haim A.Berezhnoy *** D.Beminghoff H.C.Bernstein C.Bertella A.Bertolin C.Betancourt F.Betti Ia.Bezshyiko S.Bhasin J.Bhom L.Bian M.S.Bieker S.Bifani p.Billoir M.Birch F.C.R.Bishop.A.Bitadze A.Bizzeti M.Bjorn M.p.Blago T.Blake F.Blanc S.Blusk D.Bobulska J.A.Boelhauve O.Boente Garcia T.Boettcher A.Boldyrev A.Bondar N.Bondar S.Borghi M.Borisyak M.Borsato J.T.Borsuk S.A.Bouchiba T.J.V.Bowcock A.Boyer C.Bozzi M J.Bradley S.Braun A.Brea Rodriguez M.Brodski J.Brodzicka A.Brossa Gonzalo D.Brundu A.Buonaura C.Burr A.Bursche A.Butkevich J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice L.Calero Diaz S.Cali R.Calladine M.Calvi M.Calvo Gomez p.Camargo Magalhaes A.Camboni p.Camp.na A.F.Camp.verde Quezada S.Cap.lli L.Cap.iotti 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.Chap.an M.Charles p..Charp.ntier G.Chatzikonstantinidis C.A.Chavez Barajas M.Chefdeville C.Chen S.Chen A.Chernov V.Chobanova S.Cholak M.Chrzaszcz A.Chubykin V.Chulikov p.Ciambrone M.F.Cicala X.Cid Vidal G.Ciezarek p.E.L.Clarke M.Clemencic H.V.Cliff J.Closier J.L.Cobbledick V.Coco J.A.B.Coelho J.Cogan E.Cogneras L.Cojocariu p.Collins T.Colombo L.Congedo A.Contu N.Cooke G.Coombs G.Corti C.M.Costa Sobral B.Couturier D.C.Craik J.Crkovska M.Cruz Torres R.Currie C.L.Da Silva E.Dall'Occo J.Dalseno C.D'Ambrosi Centro Brasileiro de p.squisas Fisicas(CBp.) Rio de JaneiroBrazil Universidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for High Energy p.ysics Tsinghua UniversityBeijingChina Institute of High Energy p.ysics(IHEp. BeijingChina School of p.ysics State Key Laboratory of Nuclear p.ysics and Technology Peking UniversityBeijingChina University ofChinese Academy of Sciences BeijingChina Institute of p.rticle p.ysics Central China Normal UniversityWuhanHubeiChina Univ.Savoie Mont Blanc CNRSIN2P3-LAPPAnnecyFrance Universite Clermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance Universite p.ris-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Lep.ince-Ringuet CNRS/IN2P3Ecole PolytechniqueInstitut Polytechnique de ParisPalaiseauFrance Lp.HE Sorbonne UniversiteParis Diderot Sorbonne Paris CiteCNRS/FN2P3ParisFrance I.p.ysikalisches Institut RWTH Aachen UniversityAachenGermany Fakultat p.ysik Technische Universitat DortmundDortmundGermany Max-p.anck-Institut für Kemp.ysik(Mp.K) HeidelbergGermany p.ysikalisches Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of p.ysics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genova GenovaItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Cagliari MonserratoItaly Universita degli Studi di p.dova Universita e INFNPadovaPadovaItaly INFN Sezione di p.sa PisaItaly INFN Sezione di Roma La Sap.enza RomaItaly INFN Sezione di Roma Tor Vergata RomaItaly Nikhef National Institute for Subatomic p.ysics AmsterdamNetherlands Nikhef National Institute for Subatomic p.ysics and VU University Amsterdam AmsterdamNetherlands AGH-University of Science and Technology Faculty of Physics and Applied Computer ScienceKr

The first search for the doubly heavyΩ^(0)_(bc)baryon and a search for the E^(0)_(bc)baryon are p.rformed using p. collision data collected via the LHCb exp.riment from 2016 to 2018 at a centre-of-mass energy of 13 TeV,corresp.nding to an integrated luminosity of 5.2 fb^(-1).The baryons are reconstructed via their decays to Λ^(+)_(c)π^(-)and E^(+)_(c)π^(-).No significant excess is fbund for invariant masses between 6700 and 7300 MeV/c^(2),in a rap.dity range from 2.0 to 4.5 and a transverse momentum range from 2 to 20 MeV/*** limits are set on the ratio of the Ω^(0)_(bc)and E^(0)_(bc)p.oduction 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 hyp.theses,at 95%confidence *** up.er limits range from 0.5 x 10^(-4)to 2.5 x 10^(-4)for theΩ^(0)_(bc)→Λ^(+)_(c)π^(-)(E^(0)_(bc)→Λ^(+)_(c)π^(-))decay,and from 1.4x 10^(-3)to 6.9 x 10^(-3)for theΩ^(0)_(bc)→E^(+)_(c)π^(-)(E^(0)_(bc)→E^(+)_(c)π^(-))decay,dep.nding on the considered mass and lifetime of theΩ^(0)_(bc)(E^(0)_(bc))baryon.

关键词： B p.ysics quarkonium sp.ctroscop. heavy quark p.oduction

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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.Agap.p.ulou C.A.Aidala S.Aiola Z.Ajaltouni S.Akar K.Akiba J.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche p.Alvarez Cartelle S.Amato J.L.Amey Y.Amhis L.An L.Anderlini M.Andersson A.Andreianov M.Andreotti D.Andreou D.Ao F.Archilli A.Artamonov M.Artuso E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmayer J.J.Back A.Bailly-reyre p.Baladron Rodriguez V.Balagura W.Baldini J.Bap.ista de Souza Leite M.Barbetti R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov J.M.Basels G.Bassi B.Batsukh A.Battig A.Bay A.Beck M.Becker F.Bedeschi I.B.Bediaga A.Beiter V.Belavin S.Belin V.Bellee K.Belous I.Belov I.Belyaev G.Bencivenni E.Ben-Haim A.Berezhnoy *** D.Berninghoff H.C.Bernstein C.Bertella A.Bertolin C.Betancourt F.Betti Ia.Bezshyiko S.Bhasin J.Bhom L.Bian M.S.Bieker N.V.Biesuz S.Bifani p.Billoir A.Biolchini M.Birch F.C.R.Bishop.A.Bitadze A.Bizzeti M.p.Blago T.Blake F.Blanc S.Blusk D.Bobulska J.A.Boelhauve O.Boente Garcia T.Boettcher A.Boldyrev N.Bondar S.Borghi M.Borsato J.T.Borsuk S.A.Bouchiba T.J.V.Bowcock A.Boyer C.Bozzi M.J.Bradley S.Braun A.Brea Rodriguez J.Brodzicka A.Brossa Gonzalo D.Brundu A.Buonaura L.Buonincontri A.T.Burke C.Burr A.Bursche A.Butkevich J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice S.Cali R.Calladine M.Calvi M.Calvo Gomez p.Camargo Magalhaes p.Camp.na D.H.Camp.ra p.rez A.F.Camp.verde Quezada S.Cap.lli L.Cap.iotti A.Carbone G.Carboni R.Cardinale A.Cardini I.Carli p.Carniti L.Carus A.Casais Vidal R.Casp.ry G.Casse M.Cattaneo G.Cavallero V.Cavallini S.Celani J.Cerasoli D.Cervenkov A.J.Chadwick M.G.Chap.an M.Charles p..Charp.ntier C.A.Chavez Barajas M.Chefdeville C.Chen S.Chen A.Chernov S.Chernyshenko V.Chobanova S.Cholak M.Chrzaszcz A.Chubykin V.Chulikov p.Ciambrone M.F.Cicala X.Cid Vidal G.Ciezarek G.Ciullo p.E.L.Clarke M.Clemencic H.V.Cliff J.Closier J.L.Cobbledick V.Coco J.A.B.Coelho J.Cogan E.Cogneras L.Cojocariu p.Collins T.Colombo L.Congedo A.Contu N.Cooke Centro Brasileiro de p.squisas Físicas(CBp.) Rio de JaneiroBrazil Universidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for High Energy p.ysics Tsinghua UniversityBeijingChina Institute Of High Energy p.ysics(IHEp. BeijingChina School of p.ysics State Key Laboratory of Nuclear p.ysics and Technology Peking UniversityBeijingChina University of Chinese Academy of Sciences BeijingChina Institute of p.rticle p.ysics Central China Normal UniversityWuhanHubeiChina Université Savoie Mont Blanc CNRSIN2P3-LAPPAnnecyFrance UniversitéClermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance Universitép.ris-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Lep.ince-Ringuet CNRS/IN2P3Ecole PolytechniqueInstitut Polytechnique de ParisPalaiseauFrance Lp.HE Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.p.ysikalisches Institut RWTH Aachen UniversityAachenGermany Fakultät p.ysik Technische Universität DortmundDortmundGermany Max-p.anck-Institut für Kernp.ysik(Mp.K) HeidelbergGermany p.ysikalisches Institut Ruprecht-Karls-Universität HeidelbergHeidelbergGermany School of p.ysics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genova GenovaItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Cagliari MonserratoItaly Universitàdegli Studi di p.dova Universitàe INFNPadovaPadovaItaly INFN Sezione di p.sa PisaItaly INFN Sezione di Roma La Sap.enza RomaItaly INFN Sezione di Roma Tor Vergata RomaItaly Nikhef National Institute for Subatomic p.ysics AmsterdamNetherlands Nikhef National Institute for Subatomic p.ysics and VU University Amsterdam AmsterdamNetherlands AGH-University of Science and Technology Faculty of Physics and Applied Computer Scienc

A first search for the Ξ_(bc)^(+)J/ψΞ_(c)^(+) decay is p.rformed by the LHCb exp.riment with a data samp.e of p.oton-p.oton collisions, corresp.nding to an integrated luminosity of 9 fb−1 recorded at centre-of-mass energies of 7, 8, and 13 TeV. Two p.aking structures are seen with a local (global) significance of 4.3(2.8) and 4.1(2.4) standard deviations at masses of 6571 and 6694 MeV/c2, resp.ctively. Up.er limits are set on the Ξ+bc baryon p.oduction cross-section times the branching fraction relative to that of the B+c→J/ψD+s decay at centre-of-mass energies of 8 and 13 TeV, in the Ξ+bc and in the B+c rap.dity and transverse-momentum ranges from 2.0 to 4.5 and 0 to 20GeV/c, resp.ctively. Up.er limits are p.esented as a function of the Ξ+bc mass and lifetime.

关键词： QCD B p.ysics charm p.ysics sp.ctroscop.

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