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Disinfection of dairy wastewater effluent th.ough.solar ph.tocatalysis processes

Water Science and Engineering 2018年第3期11卷 214-219页

作者： Mojtaba afsharnia Mojtaba Kianmeh. h.med Biglari Abdollah.Dargah. Abdolreza Karimi Faculty of h.alth Gonabad University of Medical Sciences Faculty of Medicine Gonabad University of Medical Sciences Faculty of h.alth Kermanshah University of Medical Sciences Faculty of Engineering Qom University of Technology

Due to th. strict regulations and reuse policies th.t govern wastewater's use as an irrigation water resource for agricultural purposes, especially in dry climates, optimization of th. disinfection process is of th. utmost importance. Th. effects of solar radiation along with.Titanium dioxide(TiO_2) nanoparticles applied to optimization of th. ph.tolysis and ph.tocatalysis processes for inactivating h.terotroph.c bacteria were investigated. Temperature, p h. and dissolved oxygen fluctuations in th. dairy wastewater effluent treated by activated sludge were examined. In addition,different dosages of TiO_2 were tested in th. solar ph.tocatalysis(ph.C S) and concentrated solar ph.tocatalysis(ph.C CS) processes. Th. results sh.w th.t th. disinfection efficiencies of th. solar ph.tolysis(ph.L S) and concentrated solar ph.tolysis(ph.L CS) processes after 30 min were about 10.5% and 68.9%, respectively, and th.t th. ph.C S and ph.C CS processes inactivated 41% and 97% of th. h.terotroph.c bacteria after 30 min, respectively. Th. p h.variation in th.se processes was negligible. Using th. ph.L CS and ph.C CS processes, th. synergistic effect between th. optical and th.rmal inactivation caused complete disinfection after th.ee h.urs. h.wever, disinfection was faster in th. ph.C CS process th.n in th. ph.L CS process. Significant correlations were found between th. disinfection efficiency and th. variation of th. dissolved oxygen concentration in th. ph.C S and ph.C CS processes, wh.le th. correlations between th. disinfection efficiency and temperature variation were not significant in th. ph.L S and ph.C S processes. Moreover, th. oxygen consumption rate was greatest(3.2 mg··L^(-1)) in th. ph.C CS process. h.nce,it could be concluded th.t th. ph.C CS process is an efficient ph.tocatalysis process for disinfection of dairy wastewater effluent.

关键词： Dairy wastewater Disinfection Ph.tocatalyst Solar Ph.tolysis and ph.tocatalysis TiO2

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Search.for th. doubly ch.rmed baryon ?cc~+

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Science Ch.na(Ph.sics,Mech.nics & 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. Albrech. F. Alessio M. Alexander A. Alfonso Albero Z. Aliouch. G. Alkh.zov P. Alvarez Cartelle S. Amato Y. Amh.s L. An L. Anderlini A. Andreianov M. Andreotti F. Arch.lli A. Artamonov M. Artuso K. Arzymatov E. Aslanides M. Atzeni B. Audurier S. Bach.ann M. Bach.ayer J. J. Back P. Baladron Rodriguez V. Balagura W. Baldini J. Baptista Leite R. J. Barlow S. Barsuk W. Barter M. Bartolini F. Barysh.ikov J. M. Basels G. Bassi B. Batsukh.A. Battig A. Bay M. Becker F. Bedesch. I. Bediaga A. Beiter V. Belavin S. Belin V. Bellee K. Belous I. Belov I. Belyaev G. Bencivenni E. Ben-h.im A. Berezh.oy R. Bernet D. Berningh.ff h. C. Bernstein C. Bertella A. Bertolin C. Betancourt F. Betti I. Bezsh.iko S. Bh.sin J. Bh.m L. Bian M. S. Bieker S. Bifani P. Billoir M. Birch.F. C. R. Bish.p A. Bitadze A. Bizzeti M. Bj?rn M. P. Blago T. Blake F. Blanc S. Blusk D. Bobulska J. A. Boelh.uve O. Boente Garcia T. Boettch.r A. Boldyrev A. Bondar N. Bondar S. Borgh. M. Borisyak M. Borsato J. T. Borsuk S. A. Bouch.ba 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. Bursch. 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 Magalh.es 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. Carvalh. Akiba A. Casais Vidal G. Casse M. Cattaneo G. Cavallero S. Celani J. Cerasoli A. J. Ch.dwick M. G. Ch.pman M. Ch.rles P. Ch.rpentier G. Ch.tzikonstantinidis C. A. Ch.vez Barajas M. Ch.fdeville C. Ch.n S. Ch.n A. Ch.rnov V. Ch.banova S. Ch.lak M. Ch.zaszcz A. Ch.bykin V. Ch.likov 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. Coelh. J. Cogan E. Cogneras L. AGh.University of Science and Tech.ology Faculty of Computer Science Electronics and Telecommunications AGh.University of Science and Tech.ology Faculty of Physics and Applied Computer Science Aix Marseille Univ Budker Institute of Nuclear Ph.sics (SB RAS) Cavendish.Laboratory University of Cambridge Center for h.gh.Energy Ph.sics Tsinghua University Centro Brasileiro de Pesquisas Físicas (CBPF) DS4DS La Salle Universitat Ramon Llull Departamento de Fisica Universidad Nacional de Colombia Department of Ph.sics and Astronomy University of Manchester Department of Ph.sics and Astronomy Uppsala University Department of Ph.sics University of Oxford Department of Ph.sics University of Warwick Eotvos Lorand University European Organization for Nuclear Research.(CERN) Fakult?t Ph.sik Technische Universit?t Dortmund Guangdong Provencial Key Laboratory of Nuclear Science Institute of Quantum Matter South China Normal University h.h. Wills Ph.sics Laboratory University of Bristol h.ngzh.u Institute for Advanced Study UCAS h.noi University of Science h.nryk Niewodniczanski Institute of Nuclear Ph.sics Polish.Academy of Sciences h.ria h.lubei National Institute of Ph.sics and Nuclear Engineering I. Ph.sikalisch.s Institut RWTH Aachen University ICCUB Universitat de Barcelona INFN Laboratori Nazionali di Frascati INFN Sezione di Bari INFN Sezione di Bologna INFN Sezione di Cagliari INFN Sezione di Ferrara INFN Sezione di Firenze INFN Sezione di Genova INFN Sezione di Milano INFN Sezione di Milano-Bicocca INFN Sezione di Perugia INFN Sezione di Pisa INFN Sezione di Roma La Sapienza INFN Sezione di Roma Tor Vergata Imperial College London Institut für Ph.sik Universit?t Rostock Institute Of h.gh.Energy Ph.sics (Ih.P) Institute for h.gh.Energy Ph.sics NRC Kurch.tov Institute (Ih.P NRC KI) Institute for Nuclear Research.of th. National Academy of Sciences (KINR) Institute for Nuclear Research.of th. Russian Academy of Sciences (INR RAS) Institute of Nuclear Ph.sics Moscow State University (SINP MSU) Institut

A search.for th. doubly ch.rmed baryon ?cc~+ with.th. decay mode ?cc~+→Ξc~+K~-π~+ is performed using proton-proton collision data at a centre-of-mass energy of 13 TeV collected by th. Lh.b experiment from 2016 to 2018, corresponding to an integrated luminosity of 5.4 fb-1. No significant signal is observed with.n th. invariant mass range of 3.6 to 4.0 GeV/c~2. Upper limits are set on th. ratio R of th. production cross-section times th. total branch.ng fraction of th. ?cc~+→Ξc~+K~-π~+ decay with.respect to th. Ξcc++→Λc~+K~-π~+π~+ decay. Upper limits at 95% credibility level for R in th. range 0.005 to 0.11 are obtained for diferent h.poth.ses on th. ?cc~+ mass and lifetime in th. rapidity range from 2.0 to 4.5 and transverse momentum range from 4 to 15 GeV/c.

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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.Albrech. F.Alessio M.Alexander A.Alfonso Albero Z.Aliouch. G.Alkh.zov P.Alvarez Cartelle S.Amato Y.Amh.s L.An L.Anderlini A.Andreianov M.Andreotti F.Arch.lli A.Artamonov M.Artuso K.Arzymatov E.Aslanides M.Atzeni B.Audurier S.Bach.ann M.Bach.ayer J.J.Back S.Baker P.Baladron Rodriguez V.Balagura W.Baldini J.Baptista Leite R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Barysh.ikov J.M.Basels G.Bassi B.Batsukh.A.Battig A.Bay M.Becker F.Bedesch. I.Bediaga A.Beiter V.Belavin S.Belin V.Bellee K.Belous I.Belov I.Belyaev G.Bencivenni E.Ben-h.im A.Berezh.oy *** D.Berningh.ff h.C.Bernstein C.Bertella E.Berth.let A.Bertolin C.Betancourt F.Betti Ia.Bezsh.iko S.Bh.sin J.Bh.m L.Bian M.S.Bieker S.Bifani P.Billoir M.Birch.F.C.R.Bish.p A.Bizzeti M.Bj┆rn M.P.Blago T.Blake F.Blanc S.Blusk D.Bobulska J.A.Boelh.uve O.Boente Garcia T.Boettch.r A.Boldyrev A.Bondar N.Bondar S.Borgh. M.Borisyak M.Borsato J.T.Borsuk S.A.Bouch.ba 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.Bursch. 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 Magalh.es 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.Carvalh. Akiba A.Casais Vidal G.Casse M.Cattaneo G.Cavallero S.Celani J.Cerasoli A.J.Ch.dwick M.G.Ch.pman M.Ch.rles Ph.Ch.rpentier G.Ch.tzikonstantinidis C.A.Ch.vez Barajas M.Ch.fdeville C.Ch.n S.Ch.n A.Ch.rnov S.-G.Ch.tic V.Ch.banova S.Ch.lak M.Ch.zaszcz A.Ch.bykin V.Ch.likov 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.Coelh. J.Cogan E.Cogneras L.Cojocariu P.Collins T.Colombo L.Congedo A.Contu N.Cooke G.Coombs G.Corti C.M.Costa Sobral B.Couturier D.C.Craik J.Crkovská M.Cruz Torres R.Currie C.L.Da Silva E.Dall’ Centro Brasileiro de Pesquisas Físicas(CBPF) Rio de JaneiroBrazil Universidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for h.gh.Energy Ph.sics Tsinghua UniversityBeijingChina Sch.ol of Ph.sics State Key Laboratory of Nuclear Ph.sics and Tech.ology Peking UniversityBeijingChina University of Ch.nese Academy of Sciences BeijingChina Institute Of h.gh.Energy Ph.sics(Ih.P) BeijingChina Institute of Particle Ph.sics Central China Normal UniversityWuhanHubeiChina Univ.Grenoble Alpes Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance UniversitéClermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance UniversitéParis-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprince-ringuet(llr) PalaiseauFrance LPNh. Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.Ph.sikalisch.s Institut RWTH Aachen UniversityAachenGermany Fakultät Ph.sik Technische Universität DortmundDortmundGermany Max-Planck-Institut für Kernph.sik(MPIK) HeidelbergGermany Ph.sikalisch.s Institut Ruprecht-Karls-Universität HeidelbergHeidelbergGermany Sch.ol of Ph.sics 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 Padova Universita e INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma Tor Vergata RomaItaly INFN Sezione di Roma La Sapienza RomaItaly Nikh.f National Institute for Subatomic Ph.sics AmsterdamNetherlands Nikh.f National Institute for Subatomic Ph.sics and VU University Amsterdam AmsterdamNetherlands h.nryk Niewodniczanski Institute of Nuclear Ph.sics Polish.Academy of Sciences KrakówPoland AGh.University of Science and Tech.o

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(Lh.b)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 th. doubly h.avy baryons Ωbc~0 and Ξbc~0 decaying to Λc~+π~- and Ξc~+π~-

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Ch.nese Ph.sics 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.Albrech. F.Alessio M.Alexander A.Alfonso Albero Z.Aliouch. G.Alkh.zov P.Alvarez Cartelle S.Amato Y.Amh.s L.An L.Anderlini A.Andreianov M.Andreotti F.Arch.lli A.Artamonov M.Artuso K.Arzymatov E.Aslanides M.Atzeni B.Audurier S.Bach.ann M.Bach.ayer J.J.Back P.Baladron Rodriguez V.Balagura W.Baldini J.Baptista Leite R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Barysh.ikov J.M.Basels G.Bassi B.Batsukh.A.Battig A.Bay M.Becker F.Bedesch. I.Bediaga A.Beiter V.Belavin S.Belin V.Bellee K.Belous I.Belov I.Belyaev G.Bencivenni E.Ben-h.im A.Berezh.oy *** D.Berningh.ff h.C.Bernstein C.Bertella A.Bertolin C.Betancourt F.Betti Ia.Bezsh.iko S.Bh.sin J.Bh.m L.Bian M.S.Bieker S.Bifani P.Billoir M.Birch.F.C.R.Bish.p A.Bitadze A.Bizzeti M.Bj?rn M.P.Blago T.Blake F.Blanc S.Blusk D.Bobulska J.A.Boelh.uve O.Boente Garcia T.Boettch.r A.Boldyrev A.Bondar N.Bondar S.Borgh. M.Borisyak M.Borsato J.T.Borsuk S.A.Bouch.ba 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.Bursch. 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 Magalh.es 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.Carvalh. Akiba A.Casais Vidal G.Casse M.Cattaneo G.Cavallero S.Celani J.Cerasoli A.J.Ch.dwick M.G.Ch.pman M.Ch.rles Ph.Ch.rpentier G.Ch.tzikonstantinidis C.A.Ch.vez Barajas M.Ch.fdeville C.Ch.n S.Ch.n A.Ch.rnov V.Ch.banova S.Ch.lak M.Ch.zaszcz A.Ch.bykin V.Ch.likov 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.Coelh. J.Cogan E.Cogneras L.Cojocariu P.Collins T.Colombo L.Congedo A.Contu N.Cooke G.Coombs G.Corti C.M.Costa Sobral B.Couturier D.C.Craik J.Crkovská M.Cruz Torres R.Currie C.L.Da Silva E.Dall’Occo J.Dalseno C.D’Amb AGh.University of Science and Tech.ology Faculty of Computer Science Electronics and Telecommunications AGh.University of Science and Tech.ology Faculty of Physics and Applied Computer Science Aix Marseille Univ CNRS/IN2P3 CPPM Budker Institute of Nuclear Ph.sics (SB RAS) Cavendish.Laboratory University of Cambridge Center for h.gh.Energy Ph.sics Tsinghua University Centro Brasileiro de Pesquisas Físicas (CBPF) DS4DS La Salle Universitat Ramon Llull Departamento de Fisica Universidad Nacional de Colombia Department of Ph.sics and Astronomy University of Manchester Department of Ph.sics and Astronomy Uppsala University Department of Ph.sics University of Oxford Department of Ph.sics University of Warwick European Organization for Nuclear Research.(CERN) Fakult?t Ph.sik Technische Universit?t Dortmund Guangdong Provencial Key Laboratory of Nuclear Science Institute of Quantum Matter South China Normal University h.h. Wills Ph.sics Laboratory University of Bristol h.ngzh.u Institute for Advanced Study UCAS h.noi University of Science h.nryk Niewodniczanski Institute of Nuclear Ph.sics Polish.Academy of Sciences h.ria h.lubei National Institute of Ph.sics and Nuclear Engineering I.Ph.sikalisch.s Institut RWTH Aachen University ICCUB Universitat de Barcelona INFN Laboratori Nazionali di Frascati INFN Sezione di Bari INFN Sezione di Bologna INFN Sezione di Cagliari INFN Sezione di Ferrara INFN Sezione di Firenze INFN Sezione di Genova INFN Sezione di Milano INFN Sezione di Milano-Bicocca INFN Sezione di Perugia INFN Sezione di Pisa INFN Sezione di Roma La Sapienza INFN Sezione di Roma Tor Vergata Imperial College London Institut für Ph.sik Universit?t Rostock Institute Of h.gh.Energy Ph.sics (Ih.P) Institute for h.gh.Energy Ph.sics NRC Kurch.tov Institute (Ih.P NRC KI) Institute for Nuclear Research.of th. National Academy of Sciences (KINR) Institute for Nuclear Research.of th. Russian Academy of Sciences (INR RAS) Institute of Nuclear Ph.sics Moscow State University (SINP MSU) Institute of Part

Th. first search.for th. doubly h.avy Ωbc~0 baryon and a search.for th. Ξbc~0 baryon are performed using pp collision data collected via th. Lh.b experiment from 2016 to 2018 at a centre-of-mass energy of 13 TeV,corresponding to an integrated luminosity of 5.2 fb-1.Th. baryons are reconstructed via th.ir decays to ∧c~+π~-andΞc~+π~-.No significant excess is found for invariant masses between 6700 and 7300 MeV/c2,in a rapidity range from2.0 to 4.5 and a transverse momentum range from 2 to 20 MeV/c.Upper limits are set on th. ratio of th. Ωbc~0 andΞbc~0 production cross-section times th. branch.ng fraction to ∧c~+π~-(Ξc~+π~-) relative to th.t of th. ∧b~0(Ξb~0) baryon,for different lifetime h.poth.ses,at 95% confidence level.Th. upper limits range from 0.5×10-4to 2.5×10-4for th.Ωbc~0→∧c~+π~-(Ξbc~0→∧c~+π~-) decay,and from 1.4×10-3to 6.9×10-3for th. Ωbc~0→Ξc~+π~-(Ξbc~0→Ξc~+π~-) decay,depending on th. considered mass and lifetime of th. Ωbc~0(Ξbc~0) baryon.

关键词： B ph.sics quarkonium spectroscopy h.avy quark production

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Search.for th. rare decays W^(+)→D_(s)^(+)γ and Z→D^(0)γ at Lh.b

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中国物理C:英文版 2023年第9期47卷 14-26页

作者： R.Aaij A.S.W.Abdelmotteleb C.Abellan Beteta F.Abudinén T.Ackernley B.Adeva M.Adinolfi P.Adlarson h.afsharnia C.Agapopoulou C.A.Aidala Z.Ajaltouni S.Akar K.Akiba J.Albrech. F.Alessio M.Alexander A.Alfonso Albero Z.Aliouch. P.Alvarez Cartelle R.Amalric S.Amato J.L.Amey Y.Amh.s L.An L.Anderlini M.Andersson A.Andreianov M.Andreotti D.Andreou D.Ao F.Arch.lli A.Artamonov M.Artuso E.Aslanides M.Atzeni B.Audurier S.Bach.ann M.Bach.ayer J.J.Back A.Bailly-reyre P.Baladron Rodriguez V.Balagura W.Baldini J.Baptista de Souza Leite M.Barbetti R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Barysh.ikov J.M.Basels G.Bassi B.Batsukh.A.Battig A.Bay A.Beck M.Becker F.Bedesch. I.B.Bediaga A.Beiter V.Belavin S.Belin V.Bellee K.Belous I.Belov I.Belyaev G.Benane G.Bencivenni E.Ben-h.im A.Berezh.oy *** *** Andres D.Berningh.ff h.C.Bernstein C.Bertella A.Bertolin C.Betancourt F.Betti Ia.Bezsh.iko S.Bh.sin J.Bh.m L.Bian M.S.Bieker N.V.Biesuz S.Bifani P.Billoir A.Biolch.ni M.Birch.F.C.R.Bish.p A.Bitadze A.Bizzeti M.P.Blago T.Blake F.Blanc J.E.Blank S.Blusk D.Bobulska J.A.Boelh.uve O.Boente Garcia T.Boettch.r A.Boldyrev C.S.Bolognani R.Bolzonella N.Bondar F.Borgato S.Borgh. M.Borsato J.T.Borsuk S.A.Bouch.ba 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.Bursch. A.Butkevich.J.S.Butter J.Buytaert W.Byczynski S.Cadeddu h.Cai R.Calabrese L.Calefice S.Cali R.Calladine M.Calvi M.Calvo Gomez P.Campana D.h.Campora Perez A.F.Campoverde Quezada S.Capelli L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini P.Carniti L.Carus A.Casais Vidal R.Caspary G.Casse M.Cattaneo G.Cavallero V.Cavallini S.Celani J.Cerasoli D.Cervenkov A.J.Ch.dwick M.G.Ch.pman M.Ch.rles Ph.Ch.rpentier C.A.Ch.vez Barajas M.Ch.fdeville C.Ch.n S.Ch.n A.Ch.rnov S.Ch.rnysh.nko V.Ch.banova S.Ch.lak M.Ch.zaszcz A.Ch.bykin V.Ch.likov 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.Coelh. J.Cogan E.Cognera Centro Brasileiro de Pesquisas Físicas(CBPF) Rio de JaneiroBrazil Universidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for h.gh.Energy Ph.sics Tsinghua UniversityBeijingChina Institute Of h.gh.Energy Ph.sics(Ih.P) BeijingChina Sch.ol of Ph.sics State Key Laboratory of Nuclear Ph.sics and Tech.ology Peking UniversityBeijingChina University of Ch.nese Academy of Sciences BeijingChina Institute of Particle Ph.sics Central China Normal UniversityWuhanHubeiChina Université Savoie Mont Blanc CNRSIN2P3-LAPPAnnecyFrance UniversitéClermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance UniversitéParis-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprince-Ringuet CNRS/IN2P3Ecole PolytechniqueInstitut Polytechnique de ParisPalaiseauFrance LPNh. Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.Ph.sikalisch.s Institut RWTH Aachen UniversityAachenGermany Fakultat Ph.sik Technische Universitat DortmundDortmundGermany Max-Planck-Institut für Kernph.sik(MPIK) HeidelbergGermany Ph.sikalisch.s Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany Sch.ol of Ph.sics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genova GenovaItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Cagliari MonserratoItaly Universitàdegli Studi di Padova Universitàe INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma La Sapienza RomaItaly INFN Sezione di Roma Tor Vergata RomaItaly Nikh.f National Institute for Subatomic Ph.sics AmsterdamNetherlands Nikh.f National Institute for Subatomic Ph.sics and VU University Amsterdam AmsterdamNetherlands AGh.University of Science and Tech.ology Faculty of Physics and Applied Computer Scienc

A search.for th. rare decays W^(+)→D_(s)^(+)γ and Z→D0γis performed using proton-proton collision data collected by th. Lh.b experiment at a centre-of-mass energy of 13TeV,corresponding to an integrated luminosity of 2.0fb−1.No significant signal is observed for eith.r decay mode and upper limits on th.ir branch.ng fractions are set using W^(+)→D_(s)^(+)γ and Z→μ+μ−decays as normalization ch.nnels.Th. upper limits are 6.5×10^(−4) and 2.1×10^(−3) at 95% confidence level for th. W^(+)→D_(s)^(+)γ and Z→D^(0)γ decay modes,respectively.Th.s is th. first reported search.for th. Z→D^(0)γ decay,wh.le th. upper limit on th. W+→D+sγbranch.ng fraction improves upon th. previous best limit.

关键词： W/Z boson rare decay upper limit of branch.ng fraction

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Measurement of Ξcc++ production in pp collisions at s1/2=13 TeV

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Ch.nese Ph.sics 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.Albrech. F.Alessio M.Alexander A.Alfonso Albero G.Alkh.zov P.Alvarez Cartelle A.A.Alves Jr S.Amato Y.Amh.s L.An L.Anderlini G.Andreassi M.Andreotti F.Arch.lli A.Artamonov M.Artuso K.Arzymatov E.Aslanides M.Atzeni B.Audurier S.Bach.ann J.J.Back S.Baker V.Balagura W.Baldini A.Baranov R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Barysh.ikov J.M.Basels G.Bassi V.Batozskaya B.Batsukh.A.Battig A.Bay M.Becker F.Bedesch. I.Bediaga A.Beiter L.J.Bel V.Belavin S.Belin V.Bellee K.Belous I.Belyaev G.Bencivenni E.Ben-h.im S.Benson S.Beranek A.Berezh.oy *** D.Berningh.ff h.C.Bernstein C.Bertella E.Berth.let A.Bertolin C.Betancourt F.Betti M.O.Bettler Ia.Bezsh.iko S.Bh.sin J.Bh.m M.S.Bieker S.Bifani P.Billoir A.Bizzeti M.Bjørn M.P.Blago T.Blake F.Blanc S.Blusk D.Bobulska V.Bocci O.Boente Garcia T.Boettch.r A.Boldyrev A.Bondar N.Bondar S.Borgh. M.Borisyak M.Borsato J.T.Borsuk T.J.V.Bowcock C.Bozzi M.J.Bradley S.Braun A.Brea Rodriguez M.Brodski J.Brodzicka A.Brossa Gonzalo D.Brundu E.Buch.nan A.Buonaura C.Burr A.Bursch. A.Butkevich.J.S.Butter J.Buytaert W.Byczynski S.Cadeddu h.Cai R.Calabrese L.Calero Diaz S.Cali R.Calladine M.Calvi M.Calvo Gomez P.Camargo Magalh.es A.Camboni P.Campana D.h.Campora Perez A.F.Campoverde Quezada L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini I.Carli P.Carniti K.Carvalh. Akiba A.Casais Vidal G.Casse M.Cattaneo G.Cavallero S.Celani R.Cenci J.Cerasoli M.G.Ch.pman M.Ch.rles Ph.Ch.rpentier G.Ch.tzikonstantinidis M.Ch.fdeville V.Ch.kalina C.Ch.n S.Ch.n A.Ch.rnov S.-G.Ch.tic V.Ch.banova S.Ch.lak M.Ch.zaszcz A.Ch.bykin P.Ciambrone M.F.Cicala X.Cid Vidal G.Ciezarek F.Cindolo P.E.L.Clarke M.Clemencic h.V.Cliff J.Closier J.L.Cobbledick V.Coco J.A.B.Coelh. J.Cogan E.Cogneras L.Cojocariu P.Collins T.Colombo A.Comerma-Montells A.Contu N.Cooke G.Coombs S.Coquereau G.Corti C.M.Costa Sobral B.Couturier D.C.Craik J.Crkovska A.Crocombe M.Cruz Torres R.Currie C.L.Da Silva E.Dall'Occo J.Dalseno C.D' Centro Brasileiro de Pesquisas Físicas(CBPF) Rio de JaneiroBrazil Universidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for h.gh.Energy Ph.sics Tsinghua UniversityBeijingChina Sch.ol of Ph.sics State Key Laboratory of Nuclear Ph.sics and Tech.ology Peking UniversityBeijingChina University of Ch.nese Academy of Sciences BeijingChina Institute Of h.gh.Energy Ph.sics(Ih.P) BeijingChina Institute of Particle Ph.sics Central China Normal UniversityWuhanHubeiChina Univ.Grenoble Alpes Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance UniversitéClermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance LAL Univ.Paris-SudCNRS/IN2P3UniversitéParis-SaclayOrsayFrance LPNh. Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.Ph.sikalisch.s Institut RWTH Aachen UniversityAachenGermany Fakultät Ph.sik Technische Universität DortmundDortmundGermany Max-Planck-Institut für Kernph.sik(MPIK) HeidelbergGermany Ph.sikalisch.s Institut Ruprecht-Karls-Universität HeidelbergHeidelbergGermany Sch.ol of Ph.sics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genova GenovaItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Cagliari MonserratoItaly INFN Sezione di Padova PadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma Tor Vergata RomaItaly INFN Sezione di Roma La Sapienza RomaItaly Nikh.f National Institute for Subatomic Ph.sics AmsterdamNetherlands Nikh.f National Institute for Subatomic Ph.sics and VU University Amsterdam AmsterdamNetherlands h.nryk Niewodniczanski Institute of Nuclear Ph.sics Polish.Academy of Sciences KrakówPoland AGh.University of Science and Tech.ology Faculty of Physics and Applied Computer ScienceKrakówPoland Nationa

Th. production of ■baryons in proton-proton collisions at a centre-of-mass energy of √s = 13 TeV is measured in th. transverse-momentum range 4h. rapidity range2.0h. data used in th.s measurement correspond to an integrated luminosity of 1.7fb^-1,recorded by th. Lh.b experiment during 2016.Th. ratio of th. ■ production cross-section times th. branch.ng fraction of th.■→∧^+cK^-π^+ π^+decay relative to th. prompt ∧^+c production cross-section is found to be(2.22±0.27±0.29)×10^-4,assuming th. central value of th. measured lifetime,wh.re th. first uncertainty is statistical and th. second systematic.

关键词： doubly ch.rmed baryons h.dron production QCD

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Search.for th. doubly h.avy baryon Ξ_(bc)^(+)→ decaying to J/ψΞ_(c)^(+)

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中国物理C:英文版 2023年第9期47卷 1-13页

作者： R.Aaij A.S.W.Abdelmotteleb C.Abellan Beteta F.Abudinén T.Ackernley B.Adeva M.Adinolfi h.afsharnia C.Agapopoulou C.A.Aidala S.Aiola Z.Ajaltouni S.Akar K.Akiba J.Albrech. F.Alessio M.Alexander A.Alfonso Albero Z.Aliouch. P.Alvarez Cartelle S.Amato J.L.Amey Y.Amh.s L.An L.Anderlini M.Andersson A.Andreianov M.Andreotti D.Andreou D.Ao F.Arch.lli A.Artamonov M.Artuso E.Aslanides M.Atzeni B.Audurier S.Bach.ann M.Bach.ayer J.J.Back A.Bailly-reyre P.Baladron Rodriguez V.Balagura W.Baldini J.Baptista de Souza Leite M.Barbetti R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Barysh.ikov J.M.Basels G.Bassi B.Batsukh.A.Battig A.Bay A.Beck M.Becker F.Bedesch. I.B.Bediaga A.Beiter V.Belavin S.Belin V.Bellee K.Belous I.Belov I.Belyaev G.Bencivenni E.Ben-h.im A.Berezh.oy *** D.Berningh.ff h.C.Bernstein C.Bertella A.Bertolin C.Betancourt F.Betti Ia.Bezsh.iko S.Bh.sin J.Bh.m L.Bian M.S.Bieker N.V.Biesuz S.Bifani P.Billoir A.Biolch.ni M.Birch.F.C.R.Bish.p A.Bitadze A.Bizzeti M.P.Blago T.Blake F.Blanc S.Blusk D.Bobulska J.A.Boelh.uve O.Boente Garcia T.Boettch.r A.Boldyrev N.Bondar S.Borgh. M.Borsato J.T.Borsuk S.A.Bouch.ba 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.Bursch. 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 Magalh.es 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.Ch.dwick M.G.Ch.pman M.Ch.rles Ph.Ch.rpentier C.A.Ch.vez Barajas M.Ch.fdeville C.Ch.n S.Ch.n A.Ch.rnov S.Ch.rnysh.nko V.Ch.banova S.Ch.lak M.Ch.zaszcz A.Ch.bykin V.Ch.likov 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.Coelh. J.Cogan E.Cogneras L.Cojocariu P.Collins T.Colombo L.Congedo A.Contu N.Cooke Centro Brasileiro de Pesquisas Físicas(CBPF) Rio de JaneiroBrazil Universidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for h.gh.Energy Ph.sics Tsinghua UniversityBeijingChina Institute Of h.gh.Energy Ph.sics(Ih.P) BeijingChina Sch.ol of Ph.sics State Key Laboratory of Nuclear Ph.sics and Tech.ology Peking UniversityBeijingChina University of Ch.nese Academy of Sciences BeijingChina Institute of Particle Ph.sics Central China Normal UniversityWuhanHubeiChina Université Savoie Mont Blanc CNRSIN2P3-LAPPAnnecyFrance UniversitéClermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance UniversitéParis-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprince-Ringuet CNRS/IN2P3Ecole PolytechniqueInstitut Polytechnique de ParisPalaiseauFrance LPNh. Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.Ph.sikalisch.s Institut RWTH Aachen UniversityAachenGermany Fakultät Ph.sik Technische Universität DortmundDortmundGermany Max-Planck-Institut für Kernph.sik(MPIK) HeidelbergGermany Ph.sikalisch.s Institut Ruprecht-Karls-Universität HeidelbergHeidelbergGermany Sch.ol of Ph.sics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genova GenovaItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Cagliari MonserratoItaly Universitàdegli Studi di Padova Universitàe INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma La Sapienza RomaItaly INFN Sezione di Roma Tor Vergata RomaItaly Nikh.f National Institute for Subatomic Ph.sics AmsterdamNetherlands Nikh.f National Institute for Subatomic Ph.sics and VU University Amsterdam AmsterdamNetherlands AGh.University of Science and Tech.ology Faculty of Physics and Applied Computer Scienc

A first search.for th. Ξ_(bc)^(+)J/ψΞ_(c)^(+) decay is performed by th. Lh.b experiment with.a data sample of proton-proton collisions, corresponding to an integrated luminosity of 9 fb−1 recorded at centre-of-mass energies of 7, 8, and 13 TeV. Two peaking structures are seen with.a local (global) significance of 4.3(2.8) and 4.1(2.4) standard deviations at masses of 6571 and 6694 MeV/c2, respectively. Upper limits are set on th. Ξ+bc baryon production cross-section times th. branch.ng fraction relative to th.t of th. B+c→J/ψD+s decay at centre-of-mass energies of 8 and 13 TeV, in th. Ξ+bc and in th. B+c rapidity and transverse-momentum ranges from 2.0 to 4.5 and 0 to 20GeV/c, respectively. Upper limits are presented as a function of th. Ξ+bc mass and lifetime.

关键词： QCD B ph.sics ch.rm ph.sics spectroscopy

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Search.for th. doubly ch.rmed baryon ■

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Science Ch.na(Ph.sics,Mech.nics & Astronomy) 2020年第2期63卷 8-22页

作者： R.Aaij C.Abellán Beteta T.Ackernley B.Adeva M.Adinolfi h.afsharnia C.A.Aidala S.Aiola Z.Ajaltouni S.Akar P.Albicocco J.Albrech. F.Alessio M.Alexander A.Alfonso Albero G.Alkh.zov P.Alvarez Cartelle A.A.Alves Jr S.Amato Y.Amh.s L.An L.Anderlini G.Andreassi M.Andreotti F.Arch.lli J.Arnau Romeu A.Artamonov M.Artuso K.Arzymatov E.Aslanides M.Atzeni B.Audurier S.Bach.ann J.J.Back S.Baker V.Balagura W.Baldini A.Baranov R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Barysh.ikov G.Bassi V.Batozskaya B.Batsukh.A.Battig V.Battista A.Bay M.Becker F.Bedesch. I.Bediaga A.Beiter L.J.Bel V.Belavin S.Belin N.Beliy V.Bellee K.Belous I.Belyaev G.Bencivenni E.Ben-h.im S.Benson S.Beranek A.Berezh.oy *** D.Berningh.ff h.C.Bernstein E.Berth.let A.Bertolin C.Betancourt F.Betti M.O.Bettler Ia.Bezsh.iko S.Bh.sin J.Bh.m M.S.Bieker S.Bifani P.Billoir A.Birnkraut A.Bizzeti M.Bjφrn M.P.Blago T.Blake F.Blanc S.Blusk D.Bobulska V.Bocci O.Boente Garcia T.Boettch.r A.Boldyrev A.Bondar N.Bondar S.Borgh. M.Borisyak M.Borsato J.T.Borsuk T.J.V.Bowcock C.Bozzi S.Braun A.Brea Rodriguez M.Brodski J.Brodzicka A.Brossa Gonzalo D.Brundu E.Buch.nan A.Buonaura C.Burr A.Bursch. J.S.Butter J.Buytaert W.Byczynski S.Cadeddu h.Cai R.Calabrese S.Cali R.Calladine M.Calvi M.Calvo Gomez A.Camboni P.Campana D.h.Campora Perez L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini P.Carniti K.Carvalh. Akiba A.Casais Vidal G.Casse M.Cattaneo G.Cavallero R.Cenci J.Cerasoli M.G.Ch.pman M.Ch.rles Ph.Ch.rpentier G.Ch.tzikonstantinidis M.Ch.fdeville V.Ch.kalina C.Ch.n S.Ch.n A.Ch.rnov S.-G.Ch.tic V.Ch.banova M.Ch.zaszcz A.Ch.bykin P.Ciambrone M.F.Cicala X.Cid Vidal G.Ciezarek F.Cindolo P.E.L.Clarke M.Clemencic h.V.Cliff J.Closier J.L.Cobbledick V.Coco J.A.B.Coelh. J.Cogan E.Cogneras L.Cojocariu P.Collins T.Colombo A.Comerma-Montells A.Contu N.Cooke G.Coombs S.Coquereau G.Corti C.M.Costa Sobral B.Couturier D.C.Craik J.Crkovska A.Crocombe M.Cruz Torres R.Currie C.L.Da Silva E.Dall'Occo J.Dalseno C.D'Ambrosio A.Danilina P.d'Argent A.Davis O.De Aguiar Francisco K.De Bruyn S.De Capua M Centro Brasileiro de Pesquisas Fisicas(CBPF) Rio de JaneiroBrazil Universidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for h.gh.Energy Ph.sics Tsinghua UniversityBeijingChina Sch.ol of Ph.sics State Key Laboratory of Nuclear Ph.sics and Tech.ology Peking UniversityBeijingChina University of Ch.nese Academy of Sciences BeijingChina Institute Of h.gh.Energy Ph.sics(Ih.P) BeijingChina Institute of Particle Ph.sics Central China Normal UniversityWuhanHubeiChina Univ.Grenoble Alpes Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance Universite Clermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance LAL Univ.Paris-SudCNRS/IN2P3Universite Paris-SaclayOrsayFrance LPNh. Sorbonne Universite Paris Diderot Sorbonne Paris Cite CNRS/IN2P3ParisFrance I.Ph.sikalisch.s Institut RWTH Aachen UniversityAachenGermany Fakultat Ph.sik Technische Universitat DortmundDortmundGermany Max-Planck-Institut für Kernph.sik(MPIK) HeidelbergGermany Ph.sikalisch.s Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany Sch.ol of Ph.sics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genova GenovaItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Cagliari MonserratoItaly INFN Sezione di Padova PadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma Tor Vergata RomaItaly INFN Sezione di Roma La Sapienza RomaItaly Nikh.f National Institute for Subatomic Ph.sics AmsterdamNetherlands Nikh.f National Institute for Subatomic Ph.sics and VU University Amsterdam AmsterdamNetherlands h.nryk Niewodniczanski Institute of Nuclear Ph.sics Polish.Academy of Sciences KrakowPoland AGh.University of Science and Tech.ology Faculty of Physics and Applied Computer ScienceKrakowPoland Natio

A search.for th. doubly ch.rmed baryon ■^+cc is performed th.ough.its decay to th.Λ^+c K^-π^+ final state,using proton-proton collision data collected with.th. Lh.b detector at centre-of-mass energies of 7,8 and 13 TeV.Th. data correspond to a total integrated luminosity of 9 fb^-1.No significant signal is observed in th. mass range from 3.4 to 3.8 GeV/c^2.Upper limits are set at 95%credibility level on th. ratio of th. ■^+cc production cross-section times th. branch.ng fraction to th.t ofΛ^+c and ■^++cc baryons.Th. limits are determined as functions of th. ■^+cc mass for different lifetime h.poth.ses,in th. rapidity range from 2.0 to 4.5 and th. transverse momentum range from 4 to 15 GeV/c.

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

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