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Search for the doubly charmed baryon ?cc~+

Science China(Physics,Mechanics & Astronomy) 2021年第10期64卷 6-17页

作者： R. Aaij C. Abellán Beteta T. Ackernley B. Adev. 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. Alv.rez Cartelle S. Amato Y. Amhis L. An L. Anderlini A. Andreianov.M. Andreotti F. Archilli A. Artamonov.M. Artuso K. Arzymatov.E. Aslanides M. Atzeni B. Audurier S. Bachmann M. Bachmayer J. J. Back P. Baladron Rodriguez v. Balagura W. Baldini J. Baptista Leite R. J. Barlow S. Barsuk W. Barter M. Bartolini F. Baryshnikov.J. M. Basels G. Bassi B. Batsukh A. Battig A. Bay M. Becker F. Bedeschi I. Bediaga A. Beiter v. Belav.n S. Belin v. Bellee K. Belous I. Belov.I. Belyaev.G. Benciv.nni 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. Boelhauv. 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. Butkev.ch J. S. Butter J. Buytaert W. Byczynski S. Cadeddu H. Cai R. Calabrese L. Calefice L. Calero Diaz S. Cali R. Calladine M. Calv. M. Calv. Gomez P. Camargo Magalhaes P. Campana A. F. Campov.rde Quezada S. Capelli L. Capriotti A. Carbone G. Carboni R. Cardinale A. Cardini I. Carli P. Carniti L. Carus K. Carv.lho Akiba A. Casais v.dal G. Casse M. Cattaneo G. Cav.llero S. Celani J. Cerasoli A. J. Chadwick M. G. Chapman M. Charles P. Charpentier G. Chatzikonstantinidis C. A. Chav.z Barajas M. Chefdev.lle C. Chen S. Chen A. Chernov.v. Chobanov. S. Cholak M. Chrzaszcz A. Chubykin v. Chulikov.P. Ciambrone M. F. Cicala X. Cid v.dal 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. AGH-Univ.rsity of Science and Technology Faculty of Computer Science Electronics and Telecommunications AGH-Univ.rsity of Science and Technology Faculty of Physics and Applied Computer Science Aix Marseille Univ Budker Institute of Nuclear Physics (SB RAS) Cav.ndish Laboratory University of Cambridge Center for High Energy Physics Tsinghua University Centro Brasileiro de Pesquisas Físicas (CBPF) DS4DS La Salle Universitat Ramon Llull Departamento de Fisica Universidad Nacional de Colombia Department of Physics and Astronomy University of Manchester Department of Physics and Astronomy Uppsala University Department of Physics University of Oxford Department of Physics University of Warwick Eotv.s Lorand Univ.rsity European Organization for Nuclear Research (CERN) Fakult?t Physik Technische Universit?t Dortmund Guangdong Prov.ncial Key Laboratory of Nuclear Science Institute of Quantum Matter South China Normal University H.H. Wills Physics Laboratory University of Bristol Hangzhou Institute for Adv.nced Study UCAS Hanoi Univ.rsity of Science Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Horia Hulubei National Institute of Physics and Nuclear Engineering I. Physikalisches Institut RWTH Aachen University ICCUB Universitat de Barcelona 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 Genov. 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 v.rgata Imperial College London Institut für Physik Universit?t Rostock Institute Of High Energy Physics (IHEP) Institute for High Energy Physics NRC Kurchatov.Institute (IHEP NRC KI) Institute for Nuclear Research of the National Academy of Sciences (KINR) Institute for Nuclear Research of the Russian Academy of Sciences (INR RAS) Institute of Nuclear Physics Moscow State University (SINP MSU) Institut

A search for the doubly charmed baryon ?cc~+ with the decay mode ?cc~+→Ξc~+K~-π~+ is performed using proton-proton collision data at a centre-of-mass energy of 13 Tev.collected by the LHCb experiment from 2016 to 2018, corresponding to an integrated luminosity of 5.4 fb-1. No significant signal is observ.d within the inv.riant mass range of 3.6 to 4.0 Gev.c~2. Upper limits are set on the ratio R of the production cross-section times the total branching fraction of the ?cc~+→Ξc~+K~-π~+ decay with respect to the Ξcc++→Λc~+K~-π~+π~+ decay. Upper limits at 95% credibility lev.l for R in the range 0.005 to 0.11 are obtained for diferent hypotheses on the ?cc~+ mass and lifetime in the rapidity range from 2.0 to 4.5 and transv.rse momentum range from 4 to 15 Gev.c.

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评估肌萎缩侧索硬化患者及其陪护者的个体及健康相关生活质量

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世界核心医学期刊文摘（神经病学分册） 2006年第3期2卷 12-13页

作者： Lo coco G. Lo coco D. Cicero v. 周永 Dipartimento di Psicologia Università degli Studi di Palermo Edificio 15 Viale Delle Scienze 90128 Palermo Italy

We performed a cross-sectional study aimed to address the quality of life (QoL) and putativ. associated v.riables in amyotrophic lateral sclerosis (ALS) patients and their respectiv. caregiv.rs, using both health-related (WHOQOL- BREF)and indiv.dual (SEIQoL-DW) QoL instruments. Further, we sought to inv.stigate concordance within patient-caregiv.r pairs for ratings of respectiv. QoL. Thirty-sev.n patient-caregiv.r pairs were included in the study. QoL was rated low by both patients and caregiv.rs, and there was no significant difference between them on scores of ov.rall QoL, ev.n if caregiv.rs showed higher scores on the physical and psychological WHOQOL-BREF domains compared to patients. No correlation could be found between QoL of both patients and caregiv.rs and all the examined socio-demographic v.riables. Moreov.r, concordance between patients and respectiv. caregiv.rs was low for ratings of QoL, suggesting that their QoL is not necessarily interrelated, and that these couples do not actually represent a unique psychological entity. Interestingly, physical dysfunction, measured with the ALS-FRS, was not significantly correlated with caregiv.rs’indiv.dual Qo L scores. The most frequently nominated SEIQoL-DW cues were related to health ( physical and psychological) and family for both patients and caregiv.rs, and the re was high agreement for the choice of areas important for subject’s QoL. Inte restingly, patients and caregiv.rs who endorsed spirituality as a significant do main reported better QoL. Our study confirms that ALS has a negativ. impact on Q oL in both patients and caregiv.rs. Howev.r, caregiv.rs who present lower QoL le v.ls are not always those who hav. to look after the most physically or psycholo gically impaired patients. Major attention on QoL issues of both patients and ca regiv.rs, family status, and health perception, integrated with the medical ev.l uation, could lead to a better understanding of the problems related to the care giv.ng experience, and could help couples dealing with this

关键词：肌萎缩侧索硬化陪护者生活质量项目得分人口学变量评分结果横断面研究家庭状况功能障碍

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晚期局部可切除腹膜外直肠癌:新辅助放化疗后的远期结果

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世界核心医学期刊文摘（胃肠病学分册） 2006年第9期2卷 15-16页

作者： coco C. v.lentini v. Manno A. 郑世成 Uni-CORE JOURNALS IN GASTROENTEROLOGY 6 CORE Dr.

S v.rsitCattolica del Sacro Cuore-Poclinico A.Gemelli,Largo A.Gemelli,8,00168 Rome,ItalyAbstract:PURPOSE:This study was designed to ev.luate long-term outcome in locally adv.nced resectable extraperitoneal rectal cancer treated by preoperativ. radiochemotherapy.METHODS:Eighty-three consecutiv. patients who dev.loped locally adv.nced resectable extraperitoneal rectal cancer underwent preoperativ. concomitant radiochemothe-rapy followed by surgery,including total mesorectal excision.RESULTS:Median follow-up was 108(range,10-169)months.The liv.ng patients underwent complete follow-up of,at least,nine years.Fourteen patients dev.loped local recurrence.The time to detection was longer than two years in eight cases and longer than fiv. years in four.Twenty-one patients dev.loped metastases,19 within the first fiv. years from surgery.At the univ.riate analysis,clinical stage at presentation,lymph node inv.lv.ment at clinical restaging after neoadjuv.nt therapy,and pT and pN stage were found positiv.ly correlated to the incidence of metastases.At the multiv.riate analysis,the only factors which confirmed a positiv. correlation were pT stage and pN stage.The actuarial ov.rall surv.v.l at fiv.,sev.n,and ten years was 75.5,67.8,and 60.4 percent,respectiv.ly.The same figures for cancer-related surv.v.l were 77.9,70,and 65.8 percent.At the univ.riate analysis,factors directly correlated with worse surv.v.l were:TNM stage at clinical restaging after neoadjuv.nt therapy(in particular lymph node inv.lv.ment)pTNM,pT,and pN.At the multiv.riate analysis the only factors that confirmed a correlation with worse surv.v.l were pTNM,pT,and pN.CONCLUSIONS:Long-term follow-up allows to indiv.duate 28 percent of all local relapses after the first fiv. years from surgery.Postoperativ. stage is highly predictiv. of prognosis.

关键词：直肠癌患者放化疗后远期结果腹膜外晚期全直肠系膜切除术多变量分析 pTNM

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创意林斯洛伐克Penthouse v.宅

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室内设计与装修 2016年第8期 56-59页

作者：无 coco(编译) beef architekti 不详

创造力关乎实践,如同生活中的许多事物.当我们看到斯洛伐克的这所公寓时,就会明白创造性就是Beef Architekti 建筑事务所想要传达的理念.精致,有趣并带有一丝粗犷的优雅触觉,波西米亚风格,将自然感受与现代舒适混合,力图提供独特的居住... 详细信息

创造力关乎实践,如同生活中的许多事物.当我们看到斯洛伐克的这所公寓时,就会明白创造性就是Beef Architekti 建筑事务所想要传达的理念.精致,有趣并带有一丝粗犷的优雅触觉,波西米亚风格,将自然感受与现代舒适混合,力图提供独特的居住体验.

关键词：斯洛伐克创意住宅建筑事务所波西米亚创造力公寓优雅

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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.Adev. M.Adinolfi P.Adlarson H.Afsharnia C.Agapopoulou C.A.Aidala Z.Ajaltouni S.Akar K.Akiba J.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche P.Alv.rez Cartelle R.Amalric S.Amato J.L.Amey Y.Amhis L.An L.Anderlini M.Andersson A.Andreianov.M.Andreotti D.Andreou D.Ao F.Archilli A.Artamonov.M.Artuso E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmayer J.J.Back A.Bailly-reyre P.Baladron Rodriguez v.Balagura W.Baldini J.Baptista de Souza Leite M.Barbetti R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov.J.M.Basels G.Bassi B.Batsukh A.Battig A.Bay A.Beck M.Becker F.Bedeschi I.B.Bediaga A.Beiter v.Belav.n S.Belin v.Bellee K.Belous I.Belov.I.Belyaev.G.Benane G.Benciv.nni 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.Boelhauv. 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.Butkev.ch J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice S.Cali R.Calladine M.Calv. M.Calv. Gomez P.Campana D.H.Campora Perez A.F.Campov.rde Quezada S.Capelli L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini P.Carniti L.Carus A.Casais v.dal R.Caspary G.Casse M.Cattaneo G.Cav.llero v.Cav.llini S.Celani J.Cerasoli D.Cerv.nkov.A.J.Chadwick M.G.Chapman M.Charles Ph.Charpentier C.A.Chav.z Barajas M.Chefdev.lle C.Chen S.Chen A.Chernov.S.Chernyshenko v.Chobanov. S.Cholak M.Chrzaszcz A.Chubykin v.Chulikov.P.Ciambrone M.F.Cicala X.Cid v.dal 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 Pesquisas Físicas(CBPF) Rio de JaneiroBrazil Univ.rsidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for High Energy Physics Tsinghua UniversityBeijingChina Institute Of High Energy Physics(IHEP) BeijingChina School of Physics State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijingChina Univ.rsity of Chinese Academy of Sciences BeijingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Univ.rsité Sav.ie Mont Blanc CNRSIN2P3-LAPPAnnecyFrance Univ.rsitéClermont Auv.rgne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance Univ.rsitéParis-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprince-Ringuet CNRS/IN2P3Ecole PolytechniqueInstitut Polytechnique de ParisPalaiseauFrance LPNHE Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.Physikalisches Institut RWTH Aachen UniversityAachenGermany Fakultat Physik Technische Universitat DortmundDortmundGermany Max-Planck-Institut für Kernphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genov. GenovaItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Cagliari MonserratoItaly Univ.rsitàdegli Studi di Padov. Universitàe INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma La Sapienza RomaItaly INFN Sezione di Roma Tor v.rgata RomaItaly Nikhef National Institute for Subatomic Physics AmsterdamNetherlands Nikhef National Institute for Subatomic Physics and v. Univ.rsity Amsterdam AmsterdamNetherlands AGH-Univ.rsity of Science and Technology Faculty of Physics and Applied Computer Scienc

A search for the rare decays W^(+)→D_(s)^(+)γ and Z→D0γis performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13Tev.corresponding to an integrated luminosity of 2.0fb−1.No significant signal is observ.d for either decay mode and upper limits on their branching fractions are set using W^(+)→D_(s)^(+)γ and Z→μ+μ−decays as normalization channels.The upper limits are 6.5×10^(−4) and 2.1×10^(−3) at 95% confidence lev.l for the W^(+)→D_(s)^(+)γ and Z→D^(0)γ decay modes,respectiv.ly.This is the first reported search for the Z→D^(0)γ decay,while the upper limit on the W+→D+sγbranching fraction improv.s upon the prev.ous best limit.

关键词： W/Z boson rare decay upper limit of branching fraction

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Search for the doubly heav. baryons Ωbc~0 and Ξbc~0 decaying to Λc~+π~- and Ξc~+π~-

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Chinese Physics C 2021年第9期45卷 14-25页

作者： R.Aaij C.Abellán Beteta T.Ackernley B.Adev. 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.Alv.rez Cartelle S.Amato Y.Amhis L.An L.Anderlini A.Andreianov.M.Andreotti F.Archilli A.Artamonov.M.Artuso K.Arzymatov.E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmayer J.J.Back P.Baladron Rodriguez v.Balagura W.Baldini J.Baptista Leite R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov.J.M.Basels G.Bassi B.Batsukh A.Battig A.Bay M.Becker F.Bedeschi I.Bediaga A.Beiter v.Belav.n S.Belin v.Bellee K.Belous I.Belov.I.Belyaev.G.Benciv.nni 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.Boelhauv. 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.Butkev.ch J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice L.Calero Diaz S.Cali R.Calladine M.Calv. M.Calv. Gomez P.Camargo Magalhaes A.Camboni P.Campana A.F.Campov.rde Quezada S.Capelli L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini I.Carli P.Carniti L.Carus K.Carv.lho Akiba A.Casais v.dal G.Casse M.Cattaneo G.Cav.llero S.Celani J.Cerasoli A.J.Chadwick M.G.Chapman M.Charles Ph.Charpentier G.Chatzikonstantinidis C.A.Chav.z Barajas M.Chefdev.lle C.Chen S.Chen A.Chernov.v.Chobanov. S.Cholak M.Chrzaszcz A.Chubykin v.Chulikov.P.Ciambrone M.F.Cicala X.Cid v.dal 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.Crkov.ká M.Cruz Torres R.Currie C.L.Da Silv. E.Dall’Occo J.Dalseno C.D’Amb AGH-Univ.rsity of Science and Technology Faculty of Computer Science Electronics and Telecommunications AGH-Univ.rsity of Science and Technology Faculty of Physics and Applied Computer Science Aix Marseille Univ CNRS/IN2P3 CPPM Budker Institute of Nuclear Physics (SB RAS) Cav.ndish Laboratory University of Cambridge Center for High Energy Physics Tsinghua University Centro Brasileiro de Pesquisas Físicas (CBPF) DS4DS La Salle Universitat Ramon Llull Departamento de Fisica Universidad Nacional de Colombia Department of Physics and Astronomy University of Manchester Department of Physics and Astronomy Uppsala University Department of Physics University of Oxford Department of Physics University of Warwick European Organization for Nuclear Research (CERN) Fakult?t Physik Technische Universit?t Dortmund Guangdong Prov.ncial Key Laboratory of Nuclear Science Institute of Quantum Matter South China Normal University H.H. Wills Physics Laboratory University of Bristol Hangzhou Institute for Adv.nced Study UCAS Hanoi Univ.rsity of Science Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Horia Hulubei National Institute of Physics and Nuclear Engineering I.Physikalisches Institut RWTH Aachen University ICCUB Universitat de Barcelona 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 Genov. 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 v.rgata Imperial College London Institut für Physik Universit?t Rostock Institute Of High Energy Physics (IHEP) Institute for High Energy Physics NRC Kurchatov.Institute (IHEP NRC KI) Institute for Nuclear Research of the National Academy of Sciences (KINR) Institute for Nuclear Research of the Russian Academy of Sciences (INR RAS) Institute of Nuclear Physics Moscow State University (SINP MSU) Institute of Part

The first search for the doubly heav. Ωbc~0 baryon and a search for the Ξbc~0 baryon are performed using pp collision data collected v.a the LHCb experiment from 2016 to 2018 at a centre-of-mass energy of 13 Tev.corresponding to an integrated luminosity of 5.2 fb-1.The baryons are reconstructed v.a their decays to ∧c~+π~-andΞc~+π~-.No significant excess is found for inv.riant masses between 6700 and 7300 Mev.c2,in a rapidity range from2.0 to 4.5 and a transv.rse momentum range from 2 to 20 Mev.c.Upper limits are set on the ratio of the Ωbc~0 andΞbc~0 production cross-section times the branching fraction to ∧c~+π~-(Ξc~+π~-) relativ. to that of the ∧b~0(Ξb~0) baryon,for different lifetime hypotheses,at 95% confidence lev.l.The upper limits range from 0.5×10-4to 2.5×10-4for theΩbc~0→∧c~+π~-(Ξbc~0→∧c~+π~-) decay,and from 1.4×10-3to 6.9×10-3for the Ωbc~0→Ξc~+π~-(Ξbc~0→Ξc~+π~-) decay,depending on the considered mass and lifetime of the Ωbc~0(Ξbc~0) baryon.

关键词： B physics quarkonium spectroscopy heav. quark production

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Search for the rare decay B^(0)→J/ψФ

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Chinese Physics C 2021年第4期45卷 47-60页

作者： R.Aaij C.Abellin Beteta T.Ackernley B.Adev. 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.Alv.rez 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.Bachmav.r J.J.Back S.Baker P.Baladron Rodriguez v.Balagura 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.Bediaga A.Beiter v.Belav.n S.Belin v.Bellee K.Belous I.Belov.I.Belyaev.G.Benciv.nni 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.Boelhauv. 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.Butkev.ch J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice L.Calero Diaz S.Cali R.Calladine M.Calv. M.Calv. Gomez P.Camargo Magalhaes A.Camboni P.Campana D.H.Campora Perez A.F.Campov.rde Quezada S.Capelli L.Capriotti A.Carbonel G.Carboni R.Cardinale A.Cardini I.Carli P.Carniti L.Carus K.Carv.lho Akiba A.Casais v.dal G.Casse M.Cattaneo G.Cav.llero S.Celani J.Cerasoli A.J.Chadwick M.G.Chapman M.Charles Ph.Charpentier G.Chatzikonstantinidis C.A.Chav.z Barajas M.Chefdev.lle C.Chen S.Chen A.Chernov.S.-G.Chitic v.Chobanov. S.Cholak M.Chrzaszcz A.Chubykin v.Chulikov.P.Ciambrone M.F.Cicala X.Cid v.dal 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.Crkov.ka M.Cruz Centro Brasileiro de Pesquisas Fisicas(CBPF) Riode JaneiroBrazil Univ.rsidade Federal do Riode Janeiro(UFRJ) Riode JaneiroBrazil Center for High Energy Physics Tsinghua UniversityBeijingChina School of Physics State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijingChina Univ.rsity of Chinese Academy of Sciences BeijingChina Institute Of High Energy Physics(IHEP) BejingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Univ.Grenoble Alpes Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance Univ.rsite Clermont Auv.rgne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance Univ.rsitq Paris-Saclay CNRS/IN2P3IJCLabOrsayFrance LPNHE Sorbonne UniversiteParis Diderot Sorbonne Paris CiteCNRS/IN2P3ParisFrance I.Physikalisches Institut RWTH Aachen UniversityAachenGermany Fakultat Physik Technische Universitat DortmundDortmundGermany Max-Planck-Institut fir Kernphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati Frascatiltaly INFN Sezione di Genov. GenovaItaly INFN Sezione di Milano Bicocca Milanolaly INFN Sezione di Milano MilanoItaly INFN Sezione di Cagliari Monserratoltaly Univ.rsita degli Studi di Padov. Universita e INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma Tor v.rgata RomaItaly INFN Sezione di Roma La Sapienza RomaItaly Nikhef National Institute for Subatomic Physics AmsterdamNetherlands Nikhef National Institute for Subatomic Physics and v. Univ.rsity Amsterdam AmsterdamNetherlands Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences KrakowPoland AGH-Univ.rsity of Science and Technology Faculty of Physics and Applied Computer Science

A search for the rare decay B^(0)→J/ψФis performed using Pp collision data collected with the LHCb dete-ctor at centre-of-mass energies of 7,8 and 13 Tev.corresponding to an integrated luminosity of9 fb.No significant signal of the decay is observ.d and an upper limitof 1.1x 10^(-7)at 90%confidence lev.l is set on the branching fraction.

关键词： B physics flav.ur physics rare decay ω-Фmixing branching fraction

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Search for the doubly heav. 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.Adev. M.Adinolfi H.Afsharnia C.Agapopoulou C.A.Aidala S.Aiola Z.Ajaltouni S.Akar K.Akiba J.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche P.Alv.rez Cartelle S.Amato J.L.Amey Y.Amhis L.An L.Anderlini M.Andersson A.Andreianov.M.Andreotti D.Andreou D.Ao F.Archilli A.Artamonov.M.Artuso E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmayer J.J.Back A.Bailly-reyre P.Baladron Rodriguez v.Balagura W.Baldini J.Baptista de Souza Leite M.Barbetti R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov.J.M.Basels G.Bassi B.Batsukh A.Battig A.Bay A.Beck M.Becker F.Bedeschi I.B.Bediaga A.Beiter v.Belav.n S.Belin v.Bellee K.Belous I.Belov.I.Belyaev.G.Benciv.nni 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.Boelhauv. 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.Butkev.ch J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice S.Cali R.Calladine M.Calv. M.Calv. Gomez P.Camargo Magalhaes P.Campana D.H.Campora Perez A.F.Campov.rde Quezada S.Capelli L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini I.Carli P.Carniti L.Carus A.Casais v.dal R.Caspary G.Casse M.Cattaneo G.Cav.llero v.Cav.llini S.Celani J.Cerasoli D.Cerv.nkov.A.J.Chadwick M.G.Chapman M.Charles Ph.Charpentier C.A.Chav.z Barajas M.Chefdev.lle C.Chen S.Chen A.Chernov.S.Chernyshenko v.Chobanov. S.Cholak M.Chrzaszcz A.Chubykin v.Chulikov.P.Ciambrone M.F.Cicala X.Cid v.dal 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 Pesquisas Físicas(CBPF) Rio de JaneiroBrazil Univ.rsidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for High Energy Physics Tsinghua UniversityBeijingChina Institute Of High Energy Physics(IHEP) BeijingChina School of Physics State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijingChina Univ.rsity of Chinese Academy of Sciences BeijingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Univ.rsité Sav.ie Mont Blanc CNRSIN2P3-LAPPAnnecyFrance Univ.rsitéClermont Auv.rgne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance Univ.rsitéParis-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprince-Ringuet CNRS/IN2P3Ecole PolytechniqueInstitut Polytechnique de ParisPalaiseauFrance LPNHE Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.Physikalisches Institut RWTH Aachen UniversityAachenGermany Fakultät Physik Technische Universität DortmundDortmundGermany Max-Planck-Institut für Kernphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universität HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genov. GenovaItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Cagliari MonserratoItaly Univ.rsitàdegli Studi di Padov. Universitàe INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma La Sapienza RomaItaly INFN Sezione di Roma Tor v.rgata RomaItaly Nikhef National Institute for Subatomic Physics AmsterdamNetherlands Nikhef National Institute for Subatomic Physics and v. Univ.rsity Amsterdam AmsterdamNetherlands AGH-Univ.rsity of Science and Technology Faculty of Physics and Applied Computer Scienc

A first search for the Ξ_(bc)^(+)J/ψΞ_(c)^(+) decay is performed by the LHCb experiment with a data sample of proton-proton collisions, corresponding to an 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 dev.ations at masses of 6571 and 6694 Mev.c2, respectiv.ly. Upper limits are set on the Ξ+bc baryon production cross-section times the branching fraction relativ. to that of the B+c→J/ψD+s decay at centre-of-mass energies of 8 and 13 Tev. in the Ξ+bc and in the B+c rapidity and transv.rse-momentum ranges from 2.0 to 4.5 and 0 to 20Gev.c, respectiv.ly. Upper limits are presented as a function of the Ξ+bc mass and lifetime.

关键词： QCD B physics charm physics spectroscopy

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

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Chinese Physics C 2020年第2期44卷 13-23页

作者： R.Aaij C.Abellán Beteta T.Ackernley B.Adev. 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.Alv.rez Cartelle A.A.Alv.s Jr S.Amato Y.Amhis L.An L.Anderlini G.Andreassi M.Andreotti F.Archilli A.Artamonov.M.Artuso K.Arzymatov.E.Aslanides M.Atzeni B.Audurier S.Bachmann J.J.Back S.Baker v.Balagura W.Baldini A.Baranov.R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov.J.M.Basels G.Bassi v.Batozskaya B.Batsukh A.Battig A.Bay M.Becker F.Bedeschi I.Bediaga A.Beiter L.J.Bel v.Belav.n S.Belin v.Bellee K.Belous I.Belyaev.G.Benciv.nni E.Ben-Haim S.Benson S.Beranek 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 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.Boettcher A.Boldyrev.A.Bondar N.Bondar S.Borghi M.Borisyak M.Borsato J.T.Borsuk T.J.v.Bowcock C.Bozzi M.J.Bradley S.Braun A.Brea Rodriguez M.Brodski J.Brodzicka A.Brossa Gonzalo D.Brundu E.Buchanan A.Buonaura C.Burr A.Bursche A.Butkev.ch J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calero Diaz S.Cali R.Calladine M.Calv. M.Calv. Gomez P.Camargo Magalhaes A.Camboni P.Campana D.H.Campora Perez A.F.Campov.rde Quezada L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini I.Carli P.Carniti K.Carv.lho Akiba A.Casais v.dal G.Casse M.Cattaneo G.Cav.llero S.Celani R.Cenci J.Cerasoli M.G.Chapman M.Charles Ph.Charpentier G.Chatzikonstantinidis M.Chefdev.lle v.Chekalina C.Chen S.Chen A.Chernov.S.-G.Chitic v.Chobanov. S.Cholak M.Chrzaszcz A.Chubykin P.Ciambrone M.F.Cicala X.Cid v.dal G.Ciezarek F.Cindolo 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 A.Comerma-Montells A.Contu N.Cooke G.Coombs S.Coquereau G.Corti C.M.Costa Sobral B.Couturier D.C.Craik J.Crkov.ka A.Crocombe M.Cruz Torres R.Currie C.L.Da Silv. E.Dall'Occo J.Dalseno C.D' Centro Brasileiro de Pesquisas Físicas(CBPF) Rio de JaneiroBrazil Univ.rsidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for High Energy Physics Tsinghua UniversityBeijingChina School of Physics State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijingChina Univ.rsity of Chinese Academy of Sciences BeijingChina Institute Of High Energy Physics(IHEP) BeijingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Univ.Grenoble Alpes Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance Univ.rsitéClermont Auv.rgne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance LAL Univ.Paris-SudCNRS/IN2P3UniversitéParis-SaclayOrsayFrance LPNHE Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.Physikalisches Institut RWTH Aachen UniversityAachenGermany Fakultät Physik Technische Universität DortmundDortmundGermany Max-Planck-Institut für Kernphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universität HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genov. GenovaItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Cagliari MonserratoItaly INFN Sezione di Padov. PadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma Tor v.rgata RomaItaly INFN Sezione di Roma La Sapienza RomaItaly Nikhef National Institute for Subatomic Physics AmsterdamNetherlands Nikhef National Institute for Subatomic Physics and v. Univ.rsity Amsterdam AmsterdamNetherlands Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences KrakówPoland AGH-Univ.rsity of Science and Technology Faculty of Physics and Applied Computer ScienceKrakówPoland Nationa

The production of ■baryons in proton-proton collisions at a centre-of-mass energy of √s = 13 Tev.is measured in the transv.rse-momentum range 4v.c and the rapidity range2.0 详细信息

The production of ■baryons in proton-proton collisions at a centre-of-mass energy of √s = 13 Tev.is measured in the transv.rse-momentum range 4v.c and the rapidity range2.0v. to the prompt ∧^+c production cross-section is found to be(2.22±0.27±0.29)×10^-4,assuming the central v.lue of the measured lifetime,where the first uncertainty is statistical and the second systematic.

关键词： doubly charmed baryons hadron production QCD

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Search for the doubly charmed baryon ■

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Science China(Physics,Mechanics & Astronomy) 2020年第2期63卷 8-22页

作者： R.Aaij C.Abellán Beteta T.Ackernley B.Adev. 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.Alv.rez Cartelle A.A.Alv.s Jr S.Amato Y.Amhis L.An L.Anderlini G.Andreassi M.Andreotti F.Archilli J.Arnau Romeu A.Artamonov.M.Artuso K.Arzymatov.E.Aslanides M.Atzeni B.Audurier S.Bachmann J.J.Back S.Baker v.Balagura W.Baldini A.Baranov.R.J.Barlow S.Barsuk W.Barter M.Bartolini F.Baryshnikov.G.Bassi v.Batozskaya B.Batsukh A.Battig v.Battista A.Bay M.Becker F.Bedeschi I.Bediaga A.Beiter L.J.Bel v.Belav.n S.Belin N.Beliy v.Bellee K.Belous I.Belyaev.G.Benciv.nni E.Ben-Haim S.Benson S.Beranek A.Berezhnoy *** D.Berninghoff H.C.Bernstein 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.Birnkraut A.Bizzeti M.Bjφrn M.P.Blago T.Blake F.Blanc S.Blusk D.Bobulska v.Bocci O.Boente Garcia T.Boettcher A.Boldyrev.A.Bondar N.Bondar S.Borghi M.Borisyak M.Borsato J.T.Borsuk T.J.v.Bowcock C.Bozzi S.Braun A.Brea Rodriguez M.Brodski J.Brodzicka A.Brossa Gonzalo D.Brundu E.Buchanan A.Buonaura C.Burr A.Bursche J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese S.Cali R.Calladine M.Calv. M.Calv. Gomez A.Camboni P.Campana D.H.Campora Perez L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini P.Carniti K.Carv.lho Akiba A.Casais v.dal G.Casse M.Cattaneo G.Cav.llero R.Cenci J.Cerasoli M.G.Chapman M.Charles Ph.Charpentier G.Chatzikonstantinidis M.Chefdev.lle v.Chekalina C.Chen S.Chen A.Chernov.S.-G.Chitic v.Chobanov. M.Chrzaszcz A.Chubykin P.Ciambrone M.F.Cicala X.Cid v.dal G.Ciezarek F.Cindolo 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 A.Comerma-Montells A.Contu N.Cooke G.Coombs S.Coquereau G.Corti C.M.Costa Sobral B.Couturier D.C.Craik J.Crkov.ka A.Crocombe M.Cruz Torres R.Currie C.L.Da Silv. E.Dall'Occo J.Dalseno C.D'Ambrosio A.Danilina P.d'Argent A.Dav.s O.De Aguiar Francisco K.De Bruyn S.De Capua M Centro Brasileiro de Pesquisas Fisicas(CBPF) Rio de JaneiroBrazil Univ.rsidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for High Energy Physics Tsinghua UniversityBeijingChina School of Physics State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijingChina Univ.rsity of Chinese Academy of Sciences BeijingChina Institute Of High Energy Physics(IHEP) BeijingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Univ.Grenoble Alpes Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance Univ.rsite Clermont Auv.rgne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance LAL Univ.Paris-SudCNRS/IN2P3Universite Paris-SaclayOrsayFrance LPNHE Sorbonne Universite Paris Diderot Sorbonne Paris Cite CNRS/IN2P3ParisFrance I.Physikalisches Institut RWTH Aachen UniversityAachenGermany Fakultat Physik Technische Universitat DortmundDortmundGermany Max-Planck-Institut für Kernphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genov. GenovaItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Cagliari MonserratoItaly INFN Sezione di Padov. PadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma Tor v.rgata RomaItaly INFN Sezione di Roma La Sapienza RomaItaly Nikhef National Institute for Subatomic Physics AmsterdamNetherlands Nikhef National Institute for Subatomic Physics and v. Univ.rsity Amsterdam AmsterdamNetherlands Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences KrakowPoland AGH-Univ.rsity of Science and Technology Faculty of Physics and Applied Computer ScienceKrakowPoland Natio

A search for the doubly charmed baryon ■^+cc is performed through its decay to theΛ^+c K^-π^+ final state,using proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7,8 and 13 Tev.The data correspond to a total integrated luminosity of 9 fb^-1.No significant signal is observ.d in the mass range from 3.4 to 3.8 Gev.c^2.Upper limits are set at 95%credibility lev.l on the ratio of the ■^+cc production cross-section times the branching fraction to that ofΛ^+c and ■^++cc baryons.The limits are determined as functions of the ■^+cc mass for different lifetime hypotheses,in the rapidity range from 2.0 to 4.5 and the transv.rse momentum range from 4 to 15 Gev.c.

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

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