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Measurement of the Bs0→μ+μ− Branching Fraction and Effective Lifetime and Search for B0→μ+μ− Decays

Physical Review Letters 2017年第19期118卷 191801-191801页

作者： R. Aaij B. Adeva M. Adinolfi Z. Ajaltouni S. Akar J. Albrecht F. Alessio M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr. S. Amato S. Amerio Y. Amhis L. An L. Anderlini G. Andreassi M. Andreotti J. E. Andrews R. B. Appleby F. Archilli P. d’Argent J. Arnau Romeu A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch I. Babuschkin S. Bachmann J. J. Back A. Badalov C. Baesso S. Baker V. Balagura W. Baldini A. Baranov R. J. Barlow C. Barschel S. Barsuk W. Barter F. Baryshnikov M. Baszczyk V. Batozskaya B. Batsukh V. Battista A. Bay L. Beaucourt J. Beddow F. Bedeschi I. Bediaga A. Beiter L. J. Bel V. Bellee N. Belloli K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson S. Beranek A. Berezhnoy R. Bernet A. Bertolin C. Betancourt F. Betti M.-O. Bettler M. van Beuzekom Ia. Bezshyiko S. Bifani P. Billoir A. Birnkraut A. Bitadze A. Bizzeti T. Blake F. Blanc J. Blouw S. Blusk V. Bocci T. Boettcher A. Bondar N. Bondar W. Bonivento I. Bordyuzhin A. Borgheresi S. Borghi M. Borisyak M. Borsato F. Bossu M. Boubdir T. J. V. Bowcock E. Bowen C. Bozzi S. Braun T. Britton J. Brodzicka E. Buchanan C. Burr A. Bursche J. Buytaert S. Cadeddu R. Calabrese 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 L. Carson K. Carvalho Akiba G. Casse L. Cassina L. Castillo Garcia M. Cattaneo G. Cavallero R. Cenci D. Chamont M. Charles Ph. Charpentier G. Chatzikonstantinidis M. Chefdeville S. Chen S. F. Cheung V. Chobanova M. Chrzaszcz A. Chubykin X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier V. Coco J. Cogan E. Cogneras V. Cogoni L. Cojocariu P. Collins A. Comerma-Montells A. Contu A. Cook G. Coombs S. Coquereau G. Corti M. Corvo C. M. Costa Sobral B. Couturier G. A. Cowan D. C. Craik A. Crocombe M. Cruz Torres S. Cunliffe R. Currie C. D’Ambrosio F. Da Cunha Marinho E. Dall’Occo J. Dalseno P. N. Y. David A. Davis K. De Bruyn S. De Capua M. De Cian J. M. De Miranda L. De Paula M. De Serio P. De Simone C. European Organization for Nuclear Research (CERN) Geneva Switzerland Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France University of Cincinnati Cincinnati Ohio USA Fakultät Physik Technische Universität Dortmund Dortmund Germany School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Imperial College London London United Kingdom Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Sezione INFN di Padova Padova Italy LAL Université Paris-Sud CNRS/IN2P3 Orsay France Center for High Energy Physics Tsinghua University Beijing China Sezione INFN di Firenze Firenze Italy Institute of Physics Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Sezione INFN di Ferrara Ferrara Italy University of Maryland College Park Maryland USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York USA Sezione INFN di Roma La Sapienza Roma Italy Department of Physics University of Warwick Coventry United Kingdom ICCUB Universitat de Barcelona Barcelona Spain Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Rio de Janeiro Brazil (associated with Institution Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil) Yandex School of Data Analysis Moscow Russia Institute of Theoretical and Experimental Physics (ITEP) Moscow Russia Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland Nation

A search for the rare decays Bs0→μ+μ− and B0→μ+μ− is performed at the LHCb experiment using data collected in pp collisions corresponding to a total integrated luminosity of 4.4 fb−1. An excess of Bs0→μ+μ− decays is observed with a significance of 7.8 standard deviations, representing the first observation of this decay in a single experiment. The branching fraction is measured to be B(Bs0→μ+μ−)=(3.0±0.6−0.2+0.3)×10−9, where the first uncertainty is statistical and the second systematic. The first measurement of the Bs0→μ+μ− effective lifetime, τ(Bs0→μ+μ−)=2.04±0.44±0.05 ps, is reported. No significant excess of B0→μ+μ− decays is found, and a 95% confidence level upper limit, B(B0→μ+μ−)<3.4×10−10, is determined. All results are in agreement with the standard model expectations.

关键词： Branching fraction Flavor changing neutral currents Leptonic, semileptonic & radiative decays Rare decays Bottom mesons Hadron colliders

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Measurement of the shape of the Λb0→Λc+μ−ν¯μ differential decay rate

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Physical Review D 2017年第11期96卷 112005-112005页

作者： R. Aaij B. Adeva M. Adinolfi Z. Ajaltouni S. Akar J. Albrecht F. Alessio M. Alexander A. Alfonso Albero S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr. S. Amato S. Amerio Y. Amhis L. An L. Anderlini G. Andreassi M. Andreotti J. E. Andrews R. B. Appleby F. Archilli P. d’Argent J. Arnau Romeu A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch I. Babuschkin S. Bachmann J. J. Back A. Badalov C. Baesso S. Baker V. Balagura W. Baldini A. Baranov R. J. Barlow C. Barschel S. Barsuk W. Barter F. Baryshnikov M. Baszczyk V. Batozskaya V. Battista A. Bay L. Beaucourt J. Beddow F. Bedeschi I. Bediaga A. Beiter L. J. Bel N. Beliy V. Bellee N. Belloli K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson S. Beranek A. Berezhnoy R. Bernet D. Berninghoff E. Bertholet A. Bertolin C. Betancourt F. Betti M.-O. Bettler M. van Beuzekom Ia. Bezshyiko S. Bifani P. Billoir A. Birnkraut A. Bitadze A. Bizzeti M. B. Bjoern T. Blake F. Blanc J. Blouw S. Blusk V. Bocci T. Boettcher A. Bondar N. Bondar W. Bonivento I. Bordyuzhin A. Borgheresi S. Borghi M. Borisyak M. Borsato M. Borysova F. Bossu M. Boubdir T. J. V. Bowcock E. Bowen C. Bozzi S. Braun T. Britton J. Brodzicka D. Brundu E. Buchanan C. Burr A. Bursche J. Buytaert W. Byczynski S. Cadeddu H. Cai R. Calabrese 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 L. Carson K. Carvalho Akiba G. Casse L. Cassina L. Castillo Garcia M. Cattaneo G. Cavallero R. Cenci D. Chamont M. Charles Ph. Charpentier G. Chatzikonstantinidis M. Chefdeville S. Chen S. F. Cheung S.-G. Chitic V. Chobanova M. Chrzaszcz A. Chubykin X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier V. Coco J. Cogan E. Cogneras V. Cogoni L. Cojocariu P. Collins T. Colombo A. Comerma-Montells A. Contu A. Cook G. Coombs S. Coquereau G. Corti M. Corvo C. M. Costa Sobral B. Couturier G. A. Cowan D. C. Craik A. Crocombe M. Cruz Torres R. Currie C. D’Ambrosio F. Da Cunha Marinho E. Dall’Occo J. European Organization for Nuclear Research (CERN) Geneva Switzerland Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France University of Cincinnati Cincinnati OH United States Fakultät Physik Technische Universität Dortmund Dortmund Germany School of Physics and Astronomy University of Glasgow Glasgow United Kingdom ICCUB Universitat de Barcelona Barcelona Spain Nikhef National Institute for Subatomic Physics Amsterdam The Netherlands Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Imperial College London London United Kingdom Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Sezione INFN di Padova Padova Italy LAL Université Paris-Sud CNRS/IN2P3 Orsay France Center for High Energy Physics Tsinghua University Beijing China Sezione INFN di Firenze Firenze Italy Institute of Physics Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Università e INFN Ferrara Ferrara Italy University of Maryland College Park MD United States School of Physics and Astronomy University of Manchester Manchester United Kingdom Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse NY United States Sezione INFN di Roma La Sapienza Roma Italy Department of Physics University of Warwick Coventry United Kingdom Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Rio de Janeiro Brazil associated to Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Yandex School of Data Analysis Moscow Russia Institute of Theoretical and Experimental Physics (ITEP) Moscow Russia Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Polan

A measurement of the shape of the differential decay rate and the associated Isgur-Wise function for the decay Λb0→Λc+μ−ν¯μ is reported, using data corresponding to 3 fb−1 collected with the LHCb detector in proton-proton collisions. The Λc+μ−ν¯μ(+anything) final states are reconstructed through the detection of a muon and a Λc+ baryon decaying into pK−π+, and the decays Λb0→Λc+π+π−μ−ν¯μ are used to determine contributions from Λb0→Λc*+μ−ν¯μ decays. The measured dependence of the differential decay rate upon the squared four-momentum transfer between the heavy baryons, q2, is compared with expectations from heavy-quark effective theory and from unquenched lattice QCD predictions.

关键词： Form factors Particle decays Quantum chromodynamics

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Corrigendum to "A preliminary investigation of user perception and behavioral intention for different review types: customers and designers perspective"

TheScientificWorldJournal

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TheScientificWorldJournal 2015年第1期2015卷 258150页

作者： Atika Qazi Ram Gopal Raj Muhammad Tahir Mehwish Waheed Saif Ur Rehman Khan Ajith Abraham Faculty of Computer Science and Information Technology University of Malaya 50603 Kuala Lumpur Malaysia. Faculty of Information Science and Technology COMSATS Institute of Information Technology (CIIT) Park Road Islamabad 44000 Pakistan Faculty of Computing and Information Technology King Abdulaziz University North Jeddah Branch Jeddah 21589 Saudi Arabia. Machine Intelligence Research Labs Scientific Network for Innovation and Research Excellence Auburn WA 98071 USA.

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Study of J/ψ Production in Jets

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Physical Review Letters 2017年第19期118卷 192001-192001页

作者： R. Aaij B. Adeva M. Adinolfi Z. Ajaltouni S. Akar J. Albrecht F. Alessio M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr. S. Amato S. Amerio Y. Amhis L. An L. Anderlini G. Andreassi M. Andreotti J. E. Andrews R. B. Appleby F. Archilli P. d’Argent J. Arnau Romeu A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch I. Babuschkin S. Bachmann J. J. Back A. Badalov C. Baesso S. Baker V. Balagura W. Baldini A. Baranov R. J. Barlow C. Barschel S. Barsuk W. Barter F. Baryshnikov M. Baszczyk V. Batozskaya B. Batsukh V. Battista A. Bay L. Beaucourt J. Beddow F. Bedeschi I. Bediaga A. Beiter L. J. Bel V. Bellee N. Belloli K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson S. Beranek A. Berezhnoy R. Bernet A. Bertolin C. Betancourt F. Betti M.-O. Bettler M. van Beuzekom Ia. Bezshyiko S. Bifani P. Billoir T. Bird A. Birnkraut A. Bitadze A. Bizzeti T. Blake F. Blanc J. Blouw S. Blusk V. Bocci T. Boettcher A. Bondar N. Bondar W. Bonivento I. Bordyuzhin A. Borgheresi S. Borghi M. Borisyak M. Borsato F. Bossu M. Boubdir T. J. V. Bowcock E. Bowen C. Bozzi S. Braun M. Britsch T. Britton J. Brodzicka E. Buchanan C. Burr A. Bursche J. Buytaert S. Cadeddu R. Calabrese 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 L. Carson K. Carvalho Akiba G. Casse L. Cassina L. Castillo Garcia M. Cattaneo G. Cavallero R. Cenci D. Chamont M. Charles Ph. Charpentier G. Chatzikonstantinidis M. Chefdeville S. Chen S.-F. Cheung V. Chobanova M. Chrzaszcz X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier V. Coco J. Cogan E. Cogneras V. Cogoni L. Cojocariu G. Collazuol P. Collins A. Comerma-Montells A. Contu A. Cook G. Coombs S. Coquereau G. Corti M. Corvo C. M. Costa Sobral B. Couturier G. A. Cowan D. C. Craik A. Crocombe M. Cruz Torres S. Cunliffe R. Currie C. D’Ambrosio F. Da Cunha Marinho E. Dall’Occo J. Dalseno P. N. Y. David A. Davis K. De Bruyn S. De Capua M. De Cian J. M. De Miranda L. De Paula M. De S European Organization for Nuclear Research (CERN) Geneva Switzerland Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France University of Cincinnati Cincinnati Ohio USA Fakultät Physik Technische Universität Dortmund Dortmund Germany School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Imperial College London London United Kingdom Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Sezione INFN di Padova Padova Italy LAL Université Paris-Sud CNRS/IN2P3 Orsay France Center for High Energy Physics Tsinghua University Beijing China Sezione INFN di Firenze Firenze Italy Institute of Physics Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Sezione INFN di Ferrara Ferrara Italy University of Maryland College Park Maryland USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York USA Sezione INFN di Roma La Sapienza Roma Italy Department of Physics University of Warwick Coventry United Kingdom ICCUB Universitat de Barcelona Barcelona Spain Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Rio de Janeiro Brazil (associated with Institution Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil) Yandex School of Data Analysis Moscow Russia Institute of Theoretical and Experimental Physics (ITEP) Moscow Russia Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland Nation

The production of J/ψ mesons in jets is studied in the forward region of proton-proton collisions using data collected with the LHCb detector at a center-of-mass energy of 13 TeV. The fraction of the jet transverse momentum carried by the J/ψ meson, z(J/ψ)≡pT(J/ψ)/pT(jet), is measured using jets with pT(jet)>20 GeV in the pseudorapidity range 2.5<η(jet)<4.0. The observed z(J/ψ) distribution for J/ψ mesons produced in b-hadron decays is consistent with expectations. However, the results for prompt J/ψ production do not agree with predictions based on fixed-order nonrelativistic QCD. This is the first measurement of the pT fraction carried by prompt J/ψ mesons in jets at any experiment.

关键词： Particle production Quantum chromodynamics

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Measurements of charm mixing and CP violation using D0→K±π∓ decays

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Physical Review D 2017年第5期95卷 052004-052004页

作者： R. Aaij B. Adeva M. Adinolfi Z. Ajaltouni S. Akar J. Albrecht F. Alessio M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr. S. Amato S. Amerio Y. Amhis L. An L. Anderlini G. Andreassi M. Andreotti J. E. Andrews R. B. Appleby F. Archilli P. d’Argent J. Arnau Romeu A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch I. Babuschkin S. Bachmann J. J. Back A. Badalov C. Baesso S. Baker W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter M. Baszczyk V. Batozskaya B. Batsukh V. Battista A. Bay L. Beaucourt J. Beddow F. Bedeschi I. Bediaga L. J. Bel V. Bellee N. Belloli K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson J. Benton A. Berezhnoy R. Bernet A. Bertolin F. Betti M.-O. Bettler M. van Beuzekom Ia. Bezshyiko S. Bifani P. Billoir T. Bird A. Birnkraut A. Bitadze A. Bizzeti T. Blake F. Blanc J. Blouw S. Blusk V. Bocci T. Boettcher A. Bondar N. Bondar W. Bonivento A. Borgheresi S. Borghi M. Borisyak M. Borsato F. Bossu M. Boubdir T. J. V. Bowcock E. Bowen C. Bozzi S. Braun M. Britsch T. Britton J. Brodzicka E. Buchanan C. Burr A. Bursche J. Buytaert S. Cadeddu R. Calabrese M. Calvi M. Calvo Gomez A. Camboni P. Campana D. Campora Perez D. H. Campora Perez L. Capriotti A. Carbone G. Carboni R. Cardinale A. Cardini P. Carniti L. Carson K. Carvalho Akiba G. Casse L. Cassina L. Castillo Garcia M. Cattaneo Ch. Cauet G. Cavallero R. Cenci M. Charles Ph. Charpentier G. Chatzikonstantinidis M. Chefdeville S. Chen S.-F. Cheung V. Chobanova M. Chrzaszcz X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier V. Coco J. Cogan E. Cogneras V. Cogoni L. Cojocariu G. Collazuol P. Collins A. Comerma-Montells A. Contu A. Cook G. Coombs S. Coquereau G. Corti M. Corvo C. M. Costa Sobral B. Couturier G. A. Cowan D. C. Craik A. Crocombe M. Cruz Torres S. Cunliffe R. Currie C. D’Ambrosio F. Da Cunha Marinho E. Dall’Occo J. Dalseno P. N. Y. David A. Davis O. De Aguiar Francisco K. De Bruyn S. De Capua M. De Cian J. M. De Miranda L. De Paula M. De Serio P. De Simone C.-T. Dean D. Decamp European Organization for Nuclear Research (CERN) Geneva Switzerland Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Fakultät Physik Technische Universität Dortmund Dortmund Germany School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Imperial College London London United Kingdom University of Cincinnati Cincinnati Ohio USA Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Sezione INFN di Padova Padova Italy LAL Université Paris-Sud CNRS/IN2P3 Orsay France Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Sezione INFN di Firenze Firenze Italy Sezione INFN di Ferrara Ferrara Italy University of Maryland College Park Maryland USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York USA Sezione INFN di Roma La Sapienza Roma Italy Department of Physics University of Warwick Coventry United Kingdom ICCUB Universitat de Barcelona Barcelona Spain Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Rio de Janeiro Brazil (associated with Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil) Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland National Center for Nuclear Research (NCBJ) Warsaw Poland LAPP Université Savoie Mont-Blanc CNRS/IN2P3 Annecy-Le-Vieux France Sezione INFN di Pisa Pisa Italy Centro Brasileiro de Pesquisas Físicas (CBPF) Rio de Janeiro

Measurements of charm mixing and CP violation parameters from the decay-time-dependent ratio of D0→K+π− to D0→K−π+ decay rates and the charge-conjugate ratio are reported. The analysis uses B¯→D*+μ−X, and charge-conjugate decays, where D*+→D0π+, and D0→K∓π±. The pp collision data are recorded by the LHCb experiment at center-of-mass energies s=7 and 8 TeV, corresponding to an integrated luminosity of 3 fb−1. The data are analyzed under three hypotheses: (i) mixing assuming CP symmetry, (ii) mixing assuming no direct CP violation in the Cabibbo-favored or doubly Cabibbo-suppressed decay amplitudes, and (iii) mixing allowing either direct CP violation and/or CP violation in the superpositions of flavor eigenstates defining the mass eigenstates. The data are also combined with those from a previous LHCb study of D0→Kπ decays from a disjoint set of D*+ candidates produced directly in pp collisions. In all cases, the data are consistent with the hypothesis of CP symmetry.

关键词： Particle mixing & oscillations

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Sequence data and association statistics from 12,940 type 2 diabetes cases and controls

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Scientific data 2017年第1期4卷 170179页

作者： Jason Flannick Christian Fuchsberger Anubha Mahajan Tanya M Teslovich Vineeta Agarwala Kyle J Gaulton Lizz Caulkins Ryan Koesterer Clement Ma Loukas Moutsianas Davis J McCarthy Manuel A Rivas John R B Perry Xueling Sim Thomas W Blackwell Neil R Robertson N William Rayner Pablo Cingolani Adam E Locke Juan Fernandez Tajes Heather M Highland Josee Dupuis Peter S Chines Cecilia M Lindgren Christopher Hartl Anne U Jackson Han Chen Jeroen R Huyghe Martijn van de Bunt Richard D Pearson Ashish Kumar Martina Müller-Nurasyid Niels Grarup Heather M Stringham Eric R Gamazon Jaehoon Lee Yuhui Chen Robert A Scott Jennifer E Below Peng Chen Jinyan Huang Min Jin Go Michael L Stitzel Dorota Pasko Stephen C J Parker Tibor V Varga Todd Green Nicola L Beer Aaron G Day-Williams Teresa Ferreira Tasha Fingerlin Momoko Horikoshi Cheng Hu Iksoo Huh Mohammad Kamran Ikram Bong-Jo Kim Yongkang Kim Young Jin Kim Min-Seok Kwon Juyoung Lee Selyeong Lee Keng-Han Lin Taylor J Maxwell Yoshihiko Nagai Xu Wang Ryan P Welch Joon Yoon Weihua Zhang Nir Barzilai Benjamin F Voight Bok-Ghee Han Christopher P Jenkinson Teemu Kuulasmaa Johanna Kuusisto Alisa Manning Maggie C Y Ng Nicholette D Palmer Beverley Balkau Alena Stančáková Hanna E Abboud Heiner Boeing Vilmantas Giedraitis Dorairaj Prabhakaran Omri Gottesman James Scott Jason Carey Phoenix Kwan George Grant Joshua D Smith Benjamin M Neale Shaun Purcell Adam S Butterworth Joanna M M Howson Heung Man Lee Yingchang Lu Soo-Heon Kwak Wei Zhao John Danesh Vincent K L Lam Kyong Soo Park Danish Saleheen Wing Yee So Claudia H T Tam Uzma Afzal David Aguilar Rector Arya Tin Aung Edmund Chan Carmen Navarro Ching-Yu Cheng Domenico Palli Adolfo Correa Joanne E Curran Dennis Rybin Vidya S Farook Sharon P Fowler Barry I Freedman Michael Griswold Daniel Esten Hale Pamela J Hicks Chiea-Chuen Khor Satish Kumar Benjamin Lehne Dorothée Thuillier Wei Yen Lim Jianjun Liu Marie Loh Solomon K Musani Sobha Puppala William R Scott Loïc Yengo Sian-Tsung Tan Herman A Taylor Farook Thameem Gregory Wilson Tien Yin Wong Pål Rasmu Department of Molecular Biology Massachusetts General Hospital Boston Massachusetts USA. Program in Medical and Population Genetics Broad Institute Cambridge Massachusetts USA. Department of Biostatistics and Center for Statistical Genetics University of Michigan Ann Arbor Michigan USA. Wellcome Trust Centre for Human Genetics Nuffield Department of Medicine University of Oxford Oxford UK. Harvard-MIT Division of Health Sciences and Technology Massachusetts Institute of Technology Cambridge Massachusetts USA. Department of Statistics University of Oxford Oxford UK. Genetics of Complex Traits University of Exeter Medical School University of Exeter Exeter UK. MRC Epidemiology Unit Institute of Metabolic Science University of Cambridge Cambridge UK. Department of Twin Research and Genetic Epidemiology King's College London London UK. Oxford Centre for Diabetes Endocrinology and Metabolism Radcliffe Department of Medicine University of Oxford Oxford UK. Department of Human Genetics Wellcome Trust Sanger Institute Hinxton Cambridgeshire UK. School of Computer Science McGill University Montreal Quebec Canada. McGill University and Génome Québec Innovation Centre Montreal Quebec Canada. Human Genetics Center The University of Texas Graduate School of Biomedical Sciences at Houston The University of Texas Health Science Center at Houston Houston Texas USA. Department of Biostatistics Boston University School of Public Health Boston Massachusetts USA. National Heart Lung and Blood Institute's Framingham Heart Study Framingham Massachusetts USA. Medical Genomics and Metabolic Genetics Branch National Human Genome Research Institute National Institutes of Health Bethesda Maryland USA. Department of Biostatistics Harvard School of Public Health Boston Massachusetts USA. Chronic Disease Epidemiology Swiss Tropical and Public Health Institute University of Basel Basel Switzerland. Institute of Genetic Epidemiology Helmholtz Zentrum München German R

To investigate the genetic basis of type 2 diabetes (T2D) to high resolution, the GoT2D and T2D-GENES consortia catalogued variation from whole-genome sequencing of 2,657 European individuals and exome sequencing of 12,940 individuals of multiple ancestries. Over 27M SNPs, indels, and structural variants were identified, including 99% of low-frequency (minor allele frequency [MAF] 0.1-5%) non-coding variants in the whole-genome sequenced individuals and 99.7% of low-frequency coding variants in the whole-exome sequenced individuals. Each variant was tested for association with T2D in the sequenced individuals, and, to increase power, most were tested in larger numbers of individuals (>80% of low-frequency coding variants in ~82 K Europeans via the exome chip, and ~90% of low-frequency non-coding variants in ~44 K Europeans via genotype imputation). The variants, genotypes, and association statistics from these analyses provide the largest reference to date of human genetic information relevant to T2D, for use in activities such as T2D-focused genotype imputation, functional characterization of variants or genes, and other novel analyses to detect associations between sequence variation and T2D.

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Observation of the B+→D*−K+π+ decay

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Physical Review D 2017年第1期96卷 011101(R)-011101(R)页

作者： R. Aaij B. Adeva M. Adinolfi Z. Ajaltouni S. Akar J. Albrecht F. Alessio M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr. S. Amato S. Amerio Y. Amhis L. An L. Anderlini G. Andreassi M. Andreotti J. E. Andrews R. B. Appleby F. Archilli P. d’Argent J. Arnau Romeu A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch I. Babuschkin S. Bachmann J. J. Back A. Badalov C. Baesso S. Baker V. Balagura W. Baldini A. Baranov R. J. Barlow C. Barschel S. Barsuk W. Barter F. Baryshnikov M. Baszczyk V. Batozskaya V. Battista A. Bay L. Beaucourt J. Beddow F. Bedeschi I. Bediaga A. Beiter L. J. Bel V. Bellee N. Belloli K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson S. Beranek A. Berezhnoy R. Bernet A. Bertolin C. Betancourt F. Betti M.-O. Bettler M. van Beuzekom Ia. Bezshyiko S. Bifani P. Billoir A. Birnkraut A. Bitadze A. Bizzeti T. Blake F. Blanc J. Blouw S. Blusk V. Bocci T. Boettcher A. Bondar N. Bondar W. Bonivento I. Bordyuzhin A. Borgheresi S. Borghi M. Borisyak M. Borsato F. Bossu M. Boubdir T. J. V. Bowcock E. Bowen C. Bozzi S. Braun T. Britton J. Brodzicka E. Buchanan C. Burr A. Bursche J. Buytaert S. Cadeddu R. Calabrese 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 L. Carson K. Carvalho Akiba G. Casse L. Cassina L. Castillo Garcia M. Cattaneo G. Cavallero R. Cenci D. Chamont M. Charles Ph. Charpentier G. Chatzikonstantinidis M. Chefdeville S. Chen S.-F. Cheung V. Chobanova M. Chrzaszcz A. Chubykin X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier V. Coco J. Cogan E. Cogneras V. Cogoni L. Cojocariu P. Collins A. Comerma-Montells A. Contu A. Cook G. Coombs S. Coquereau G. Corti M. Corvo C. M. Costa Sobral B. Couturier G. A. Cowan D. C. Craik A. Crocombe M. Cruz Torres S. Cunliffe R. Currie C. D’Ambrosio F. Da Cunha Marinho E. Dall’Occo J. Dalseno A. Davis K. De Bruyn S. De Capua M. De Cian J. M. De Miranda L. De Paula M. De Serio P. De Simone C. T. Dean D. Decamp M. Deck European Organization for Nuclear Research (CERN) Geneva Switzerland Universidad de Santiago de Compostela Santiago de Compostela Spain H. H. Wills Physics Laboratory University of Bristol Bristol United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France University of Cincinnati Cincinnati Ohio USA Fakultät Physik Technische Universität Dortmund Dortmund Germany School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Imperial College London London United Kingdom Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Sezione INFN di Padova Padova Italy LAL Université Paris-Sud CNRS/IN2P3 Orsay France Center for High Energy Physics Tsinghua University Beijing China Sezione INFN di Firenze Firenze Italy Institute of Physics Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Sezione INFN di Ferrara Ferrara Italy University of Maryland College Park Maryland USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York USA Sezione INFN di Roma La Sapienza Roma Italy Department of Physics University of Warwick Coventry United Kingdom ICCUB Universitat de Barcelona Barcelona Spain Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Rio de Janeiro Brazil (associated to Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil) Yandex School of Data Analysis Moscow Russia Institute of Theoretical and Experimental Physics (ITEP) Moscow Russia Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland National Center for

The B+→D*−K+π+ decay potentially provides an excellent way to investigate charm meson spectroscopy. The decay is searched for in a sample of proton-proton collision data collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb−1. A clear signal is observed, and the ratio of its branching fraction to that of the B+→D*−π+π+ normalization channel is measured to be B(B+→D*−K+π+)/B(B+→D*−π+π+)=(6.39±0.27±0.48)×10−2, where the first uncertainty is statistical and the second is systematic. This is the first observation of the B+→D*−K+π+ decay.

关键词： Branching fraction Hadronic decays Particle decays Bottom mesons

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Observation of Bc+→J/ψD(*)K(*) decays

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Physical Review D 2017年第3期95卷 032005-032005页

作者： R. Aaij B. Adeva M. Adinolfi Z. Ajaltouni S. Akar J. Albrecht F. Alessio M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr S. Amato S. Amerio Y. Amhis L. An L. Anderlini G. Andreassi M. Andreotti J. E. Andrews R. B. Appleby F. Archilli P. d’Argent J. Arnau Romeu A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch I. Babuschkin S. Bachmann J. J. Back A. Badalov C. Baesso S. Baker V. Balagura W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter F. Baryshnikov M. Baszczyk V. Batozskaya B. Batsukh V. Battista A. Bay L. Beaucourt J. Beddow F. Bedeschi I. Bediaga L. J. Bel V. Bellee N. Belloli K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson A. Berezhnoy R. Bernet A. Bertolin C. Betancourt F. Betti M.-O. Bettler M. van Beuzekom Ia. Bezshyiko S. Bifani P. Billoir T. Bird A. Birnkraut A. Bitadze A. Bizzeti T. Blake F. Blanc J. Blouw S. Blusk V. Bocci T. Boettcher A. Bondar N. Bondar W. Bonivento I. Bordyuzhin A. Borgheresi S. Borghi M. Borisyak M. Borsato F. Bossu M. Boubdir T. J. V. Bowcock E. Bowen C. Bozzi S. Braun M. Britsch T. Britton J. Brodzicka E. Buchanan C. Burr A. Bursche J. Buytaert S. Cadeddu R. Calabrese 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 L. Carson K. Carvalho Akiba G. Casse L. Cassina L. Castillo Garcia M. Cattaneo G. Cavallero R. Cenci D. Chamont M. Charles Ph. Charpentier G. Chatzikonstantinidis M. Chefdeville S. Chen S.-F. Cheung V. Chobanova M. Chrzaszcz X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier V. Coco J. Cogan E. Cogneras V. Cogoni L. Cojocariu G. Collazuol P. Collins A. Comerma-Montells A. Contu A. Cook G. Coombs S. Coquereau G. Corti M. Corvo C. M. Costa Sobral B. Couturier G. A. Cowan D. C. Craik A. Crocombe M. Cruz Torres S. Cunliffe R. Currie C. D’Ambrosio F. Da Cunha Marinho E. Dall’Occo J. Dalseno P. N. Y. David A. Davis K. De Bruyn S. De Capua M. De Cian J. M. De Miranda L. De Paula M. De Serio P. De Simone C.-T. Dean D. D European Organization for Nuclear Research (CERN) Geneva Switzerland Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France University of Cincinnati Cincinnati Ohio USA Fakultät Physik Technische Universität Dortmund Dortmund Germany School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Nikhef National Institute for Subatomic Physics Amsterdam The Netherlands Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Imperial College London London United Kingdom Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Sezione INFN di Padova Padova Italy LAL Université Paris-Sud CNRS/IN2P3 Orsay France Center for High Energy Physics Tsinghua University Beijing China Sezione INFN di Firenze Firenze Italy Institute of Physics Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Sezione INFN di Ferrara Ferrara Italy University of Maryland College Park Maryland USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York USA Sezione INFN di Roma La Sapienza Roma Italy Department of Physics University of Warwick Coventry United Kingdom ICCUB Universitat de Barcelona Barcelona Spain Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Rio de Janeiro Brazil (associated with Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil) Institute of Theoretical and Experimental Physics (ITEP) Moscow Russia Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland National Center for Nuclear Research (NCBJ) Warsaw Poland L

A search for the decays Bc+→J/ψD(*)0K+ and Bc+→J/ψD(*)+K*0 is performed with data collected at the LHCb experiment corresponding to an integrated luminosity of 3 fb−1. The decays Bc+→J/ψD0K+ and Bc+→J/ψD*0K+ are observed for the first time, while first evidence is reported for the Bc+→J/ψD*+K*0 and Bc+→J/ψD+K*0 decays. The branching fractions of these decays are determined relative to the Bc+→J/ψπ+ decay. The Bc+ mass is measured, using the J/ψD0K+ final state, to be 6274.28±1.40(stat)±0.32(syst) MeV/c2. This is the most precise single measurement of the Bc+ mass to date.

关键词： Bottom mesons Mass

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Amplitude analysis of B+→J/ψϕK+ decays

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Physical Review D 2017年第1期95卷 012002-012002页

作者： R. Aaij B. Adeva M. Adinolfi Z. Ajaltouni S. Akar J. Albrecht F. Alessio M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr. S. Amato S. Amerio Y. Amhis L. An L. Anderlini G. Andreassi M. Andreotti J. E. Andrews R. B. Appleby O. Aquines Gutierrez F. Archilli P. d’Argent J. Arnau Romeu A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch I. Babuschkin S. Bachmann J. J. Back A. Badalov C. Baesso W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter V. Batozskaya B. Batsukh V. Battista A. Bay L. Beaucourt J. Beddow F. Bedeschi I. Bediaga L. J. Bel V. Bellee N. Belloli K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson J. Benton A. Berezhnoy R. Bernet A. Bertolin F. Betti M.-O. Bettler M. van Beuzekom I. Bezshyiko S. Bifani P. Billoir T. Bird A. Birnkraut A. Bitadze A. Bizzeti T. Blake F. Blanc J. Blouw S. Blusk V. Bocci T. Boettcher A. Bondar N. Bondar W. Bonivento A. Borgheresi S. Borghi M. Borisyak M. Borsato F. Bossu M. Boubdir T. J. V. Bowcock E. Bowen C. Bozzi S. Braun M. Britsch T. Britton J. Brodzicka E. Buchanan C. Burr A. Bursche J. Buytaert S. Cadeddu R. Calabrese M. Calvi M. Calvo Gomez P. Campana D. Campora Perez L. Capriotti A. Carbone G. Carboni R. Cardinale A. Cardini P. Carniti L. Carson K. Carvalho Akiba G. Casse L. Cassina L. Castillo Garcia M. Cattaneo Ch. Cauet G. Cavallero R. Cenci M. Charles Ph. Charpentier G. Chatzikonstantinidis M. Chefdeville S. Chen S.-F. Cheung V. Chobanova M. Chrzaszcz X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier V. Coco J. Cogan E. Cogneras V. Cogoni L. Cojocariu G. Collazuol P. Collins A. Comerma-Montells A. Contu A. Cook S. Coquereau G. Corti M. Corvo C. M. Costa Sobral B. Couturier G. A. Cowan D. C. Craik A. Crocombe M. Cruz Torres S. Cunliffe R. Currie C. D’Ambrosio E. Dall’Occo J. Dalseno P. N. Y. David A. Davis O. De Aguiar Francisco K. De Bruyn S. De Capua M. De Cian J. M. De Miranda L. De Paula M. De Serio P. De Simone C.-T. Dean D. Decamp M. Deckenhoff L. Del Buono M. Demmer D. Derkach O. Deschamps European Organization for Nuclear Research (CERN) Geneva Switzerland Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Fakultät Physik Technische Universität Dortmund Dortmund Germany School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Nikhef National Institute for Subatomic Physics Amsterdam The Netherlands Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Imperial College London London United Kingdom University of Cincinnati Cincinnati Ohio USA Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Sezione INFN di Padova Padova Italy LAL Université Paris-Sud CNRS/IN2P3 Orsay France Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Sezione INFN di Firenze Firenze Italy Sezione INFN di Ferrara Ferrara Italy University of Maryland College Park Maryland USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Max-Planck-Institut für Kernphysik (MPIK) Heidelberg Germany Centro Brasileiro de Pesquisas Físicas (CBPF) Rio de Janeiro Brazil Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York USA Sezione INFN di Roma La Sapienza Roma Italy Department of Physics University of Warwick Coventry United Kingdom ICCUB Universitat de Barcelona Barcelona Spain Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Rio de Janeiro Brazil (associated with Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil) National Center for Nuclear Research (NCBJ) Warsaw Poland LAPP Université Savoie Mont-Blanc CNRS/IN2P3 Annecy-Le-Vieux France Sezione INFN di Pisa Pisa Italy Sezione INFN di Mila

The first full amplitude analysis of B+→J/ψϕK+ with J/ψ→μ+μ−, ϕ→K+K− decays is performed with a data sample of 3 fb−1 of pp collision data collected at s=7 and 8 TeV with the LHCb detector. The data cannot be described by a model that contains only excited kaon states decaying into ϕK+, and four J/ψϕ structures are observed, each with significance over 5 standard deviations. The quantum numbers of these structures are determined with significance of at least 4 standard deviations. The lightest has mass consistent with, but width much larger than, previous measurements of the claimed X(4140) state. The model includes significant contributions from a number of expected kaon excitations, including the first observation of the K*(1680)+→ϕK+ transition.

关键词： Charm quark Mesons Quark model Strange quark

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Observation of charmless baryonic decays B(s)0→pp¯h+h′−

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Physical Review D 2017年第5期96卷 051103(R)-051103(R)页

作者： R. Aaij B. Adeva M. Adinolfi Z. Ajaltouni S. Akar J. Albrecht F. Alessio M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr. S. Amato S. Amerio Y. Amhis L. An L. Anderlini G. Andreassi M. Andreotti J. E. Andrews R. B. Appleby F. Archilli P. d’Argent J. Arnau Romeu A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch I. Babuschkin S. Bachmann J. J. Back A. Badalov C. Baesso S. Baker V. Balagura W. Baldini A. Baranov R. J. Barlow C. Barschel S. Barsuk W. Barter F. Baryshnikov M. Baszczyk V. Batozskaya B. Batsukh V. Battista A. Bay L. Beaucourt J. Beddow F. Bedeschi I. Bediaga A. Beiter L. J. Bel V. Bellee N. Belloli K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson S. Beranek A. Berezhnoy R. Bernet A. Bertolin C. Betancourt F. Betti M.-O. Bettler M. van Beuzekom Ia. Bezshyiko S. Bifani P. Billoir A. Birnkraut A. Bitadze A. Bizzeti T. Blake F. Blanc J. Blouw S. Blusk V. Bocci T. Boettcher A. Bondar N. Bondar W. Bonivento I. Bordyuzhin A. Borgheresi S. Borghi M. Borisyak M. Borsato F. Bossu M. Boubdir T. J. V. Bowcock E. Bowen C. Bozzi S. Braun T. Britton J. Brodzicka E. Buchanan C. Burr A. Bursche J. Buytaert S. Cadeddu R. Calabrese 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 L. Carson K. Carvalho Akiba G. Casse L. Cassina L. Castillo Garcia M. Cattaneo G. Cavallero R. Cenci D. Chamont M. Charles Ph. Charpentier G. Chatzikonstantinidis M. Chefdeville S. Chen S. F. Cheung V. Chobanova M. Chrzaszcz A. Chubykin X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier V. Coco J. Cogan E. Cogneras V. Cogoni L. Cojocariu P. Collins A. Comerma-Montells A. Contu A. Cook G. Coombs S. Coquereau G. Corti M. Corvo C. M. Costa Sobral B. Couturier G. A. Cowan D. C. Craik A. Crocombe M. Cruz Torres S. Cunliffe R. Currie C. D’Ambrosio F. Da Cunha Marinho E. Dall’Occo J. Dalseno A. Davis K. De Bruyn S. De Capua M. De Cian J. M. De Miranda L. De Paula M. De Serio P. De Simone C. T. Dean D. Dec European Organization for Nuclear Research (CERN) Geneva Switzerland Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France University of Cincinnati Cincinnati Ohio USA Fakultät Physik Technische Universität Dortmund Dortmund Germany School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Imperial College London London United Kingdom Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Sezione INFN di Padova Padova Italy LAL Université Paris-Sud CNRS/IN2P3 Orsay France Center for High Energy Physics Tsinghua University Beijing China Sezione INFN di Firenze Firenze Italy Institute of Physics Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Universita e INFN Ferrara Ferrara Italy University of Maryland College Park Maryland USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York USA Sezione INFN di Roma La Sapienza Roma Italy Department of Physics University of Warwick Coventry United Kingdom ICCUB Universitat de Barcelona Barcelona Spain Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Rio de Janeiro Brazil (associated with Institution Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil) Yandex School of Data Analysis Moscow Russia Institute of Theoretical and Experimental Physics (ITEP) Moscow Russia Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland Nat

Decays of B0 and Bs0 mesons to the charmless baryonic final states pp¯h+h′−, where h and h′ each denote a kaon or a pion, are searched for using the LHCb detector. The analysis is based on a sample of proton-proton collision data collected at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb−1. Four-body charmless baryonic Bs0 decays are observed for the first time. The decays Bs0→pp¯K+K−, Bs0→pp¯K±π∓, B0→pp¯K±π∓ and B0→pp¯π+π− are observed with a significance greater than 5 standard deviations; evidence at 4.1 standard deviations is found for the B0→pp¯K+K− decay and an upper limit is set on the branching fraction for Bs0→pp¯π+π−. Branching fractions in the kinematic region m(pp¯)<2850 MeV/c2 are measured relative to the B0→J/ψ(→pp¯)K*(892)0 channel.

关键词： Branching fraction Hadronic decays Particle decays

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