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Measurement of the Difference of Time-Integrated CP Asymmetries in D0→K−K+ and D0→π−π+ Decays

Physical Review Letters 2016年第19期116卷 191601-191601页

作者： R. Aaij C. Abellán Beteta B. Adeva M. Adinolfi A. Affolder 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 A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch S. Bachmann J. J. Back A. Badalov C. Baesso W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter V. Batozskaya V. Battista A. Bay L. Beaucourt J. Beddow F. Bedeschi I. Bediaga L. J. Bel V. Bellee N. Belloli 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 S. Bifani P. Billoir T. Bird A. Birnkraut A. Bizzeti T. Blake F. Blanc J. Blouw S. Blusk V. Bocci A. Bondar N. Bondar W. Bonivento A. Borgheresi S. Borghi M. Borisyak M. Borsato T. J. V. Bowcock E. Bowen C. Bozzi S. Braun M. Britsch T. Britton J. Brodzicka N. H. Brook 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 M. Chefdeville S. Chen S.-F. Cheung N. Chiapolini 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 M. Coombes S. Coquereau G. Corti M. Corvo 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 P. De Simone C.-T. Dean D. Decamp M. Deckenhoff L. Del Buono N. Déléage M. Demmer D. Derkach O. Deschamps F. Dettori B. Dey A. Di Canto F. Di Ruscio H. Dijkstra S. Donleavy F. Dordei M. Dorigo A. Dosil S European Organization for Nuclear Research (CERN) Geneva Switzerland Physik-Institut Universität Zürich Zürich Switzerland Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom Oliver Lodge Laboratory University of Liverpool Liverpool 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 OH United States 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 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 MD United States School of Physics and Astronomy University of Manchester Manchester United Kingdom Max-Planck-Institut für Kernphysik (MPIK) Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany 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 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) National Center for Nuclear Resear

A search for CP violation in D0→K−K+ and D0→π−π+ decays is performed using pp collision data, corresponding to an integrated luminosity of 3 fb−1, collected using the LHCb detector at center-of-mass energies of 7 and 8 TeV. The flavor of the charm meson is inferred from the charge of the pion in D*+→D0π+ and D*−→D¯0π− decays. The difference between the CP asymmetries in D0→K−K+ and D0→π−π+ decays, ΔACP≡ACP(K−K+)−ACP(π−π+), is measured to be [−0.10±0.08(stat)±0.03(syst)]%. This is the most precise measurement of a time-integrated CP asymmetry in the charm sector from a single experiment.

关键词： Charmed mesons CP violation Symmetries

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First Observation of D0−D¯0 Oscillations in D0→K+π−π+π− Decays and Measurement of the Associated Coherence Parameters

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Physical Review Letters 2016年第24期116卷 241801-241801页

作者： R. Aaij C. Abellán Beteta B. Adeva M. Adinolfi A. Affolder 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 A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch S. Bachmann J. J. Back A. Badalov C. Baesso W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter V. Batozskaya V. Battista A. Bay L. Beaucourt J. Beddow F. Bedeschi I. Bediaga L. J. Bel V. Bellee N. Belloli 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 S. Bifani P. Billoir T. Bird A. Birnkraut A. Bizzeti T. Blake F. Blanc J. Blouw S. Blusk V. Bocci A. Bondar N. Bondar W. Bonivento A. Borgheresi S. Borghi M. Borisyak M. Borsato T. J. V. Bowcock E. Bowen C. Bozzi S. Braun M. Britsch T. Britton J. Brodzicka N. H. Brook 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 M. Chefdeville S. Chen S.-F. Cheung N. Chiapolini 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 M. Coombes S. Coquereau G. Corti M. Corvo 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 P. De Simone C.-T. Dean D. Decamp M. Deckenhoff L. Del Buono N. Déléage M. Demmer D. Derkach O. Deschamps F. Dettori B. Dey A. Di Canto F. Di Ruscio H. Dijkstra S. Donleavy F. Dordei M. Dorigo A. Dosil S European Organization for Nuclear Research (CERN) Geneva Switzerland Physik-Institut Universität Zürich Zürich Switzerland Universidad de Santiago de Compostela Santiago de Compostela Spain H. H. Wills Physics Laboratory University of Bristol Bristol United Kingdom Oliver Lodge Laboratory University of Liverpool Liverpool 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 Center for High Energy Physics Tsinghua University Beijing China 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 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 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 L

Charm meson oscillations are observed in a time-dependent analysis of the ratio of D0→K+π−π+π− to D0→K−π+π−π+ decay rates, using data corresponding to an integrated luminosity of 3.0 fb−1 recorded by the LHCb experiment. The measurements presented are sensitive to the phase-space averaged ratio of doubly Cabibbo-suppressed to Cabibbo-favored amplitudes rDK3π and the product of the coherence factor RDK3π and a charm mixing parameter yK3π′. The constraints measured are rDK3π=(5.67±0.12)×10−2, which is the most precise determination to date, and RDK3πyK3π′=(0.3±1.8)×10−3, which provides useful input for determinations of the CP-violating phase γ in B±→DK±, D→K∓π±π∓π± decays. The analysis also gives the most precise measurement of the D0→K+π−π+π− branching fraction, and the first observation of D0–D¯0 oscillations in this decay mode, with a significance of 8.2 standard deviations.

关键词： Hadron mixing Hadronic decays Quark mixing Charmed mesons Hadron colliders Particle decays Particle mixing & oscillations

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Measurement of the CP Asymmetry in Bs0−B¯s0 Mixing

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Physical Review Letters 2016年第6期117卷 061803-061803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 S. Bachmann J. J. Back A. Badalov C. Baesso W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter M. Baszczyk V. Batozskaya 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 M.-O. Bettler M. van Beuzekom 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 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 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 P. De Simone C. T. Dean D. Decamp M. Deckenhoff L. Del Buono M. Demmer D. Derkach O. Deschamps F. Dettori B. Dey A. Di Canto H. Dijkstra F. Dordei M. Dorigo A. Dosil Suárez A. Dovbnya K. Dre 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 Institute of Physics 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 (

The CP asymmetry in the mixing of Bs0 and B¯s0 mesons is measured in proton-proton collision data corresponding to an integrated luminosity of 3.0 fb−1, recorded by the LHCb experiment at center-of-mass energies of 7 and 8 TeV. Semileptonic Bs0 and B¯s0 decays are studied in the inclusive mode Ds∓μ±ν(−)μX with the Ds∓ mesons reconstructed in the K+K−π∓ final state. Correcting the observed charge asymmetry for detection and background effects, the CP asymmetry is found to be asls=(0.39±0.26±0.20)%, where the first uncertainty is statistical and the second systematic. This is the most precise measurement of asls to date. It is consistent with the prediction from the standard model and will constrain new models of particle physics.

关键词： Hadron mixing Bottom mesons CP violation

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Measurement of CP Violation in B0→D+D− Decays

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Physical Review Letters 2016年第26期117卷 261801-261801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 The Netherlands Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Imperial College London London United Kingdom University of Cincinnati Cincinnati OH United States 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 Insitute of Physics 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 MD United States 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 NY United States 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

The CP violation observables S and C in the decay channel B0→D+D− are determined from a sample of proton-proton collisions at center-of-mass energies of 7 and 8 TeV, collected by the LHCb experiment and corresponding to an integrated luminosity of 3 fb−1. The observable S describes CP violation in the interference between mixing and the decay amplitude, and C parametrizes direct CP violation in the decay. The following values are obtained from a flavor-tagged, decay-time-dependent analysis: S=−0.54−0.16+0.17(stat)±0.05(syst), C=0.26−0.17+0.18(stat)±0.02(syst). These values provide evidence for CP violation at a significance level of 4.0 standard deviations. The phase shift due to higher-order standard model corrections is constrained to a small value of Δϕ=−0.16−0.21+0.19 rad.

关键词： Hadronic decays Quark mixing Bottom mesons Charmed mesons CP violation Hadron colliders

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Updated and revised neutron reaction data for ^(233)U

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Chinese Physics C 2013年第7期37卷 27-32页

作者：于保生陈国长张华曹文田唐国有陶曦 Laboratory of Science and Technology on Nuclear Data China Institute of Atomic Energy School of Physics & State Key Laboratory of Nuclear Physics and Technology Peking University

A complete set of n＋233U neutron reaction data from 10-6 eV-20 MeV is updated and revised based on the evaluated experimental data and the feedback information of various benchmark tests, The main revised quantities are nubars, cross sections as well as angular distributions, etc. The benchmark tests indicate that the present evaluated data achieve very promising results.

关键词： 233U nuclear data evaluation CENDL neutron

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Measurement of the higher-order anisotropic flow coefficients for identified hadrons in Au + Au collisions at sNN=200GeV

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Physical Review C 2016年第5期93卷 051902(R)-051902(R)页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander K. Aoki Y. Aramaki E. T. Atomssa R. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay K. N. Barish B. Bassalleck A. T. Basye S. Bathe V. Baublis C. Baumann A. Bazilevsky S. Belikov R. Belmont R. Bennett A. Berdnikov Y. Berdnikov A. A. Bickley J. S. Bok K. Boyle M. L. Brooks H. Buesching V. Bumazhnov G. Bunce S. Butsyk C. M. Camacho S. Campbell C.-H. Chen C. Y. Chi M. Chiu I. J. Choi R. K. Choudhury P. Christiansen T. Chujo P. Chung O. Chvala V. Cianciolo Z. Citron B. A. Cole M. Connors P. Constantin M. Csanád T. Csörgő T. Dahms S. Dairaku I. Danchev K. Das A. Datta G. David A. Denisov A. Deshpande E. J. Desmond O. Dietzsch A. Dion M. Donadelli O. Drapier A. Drees K. A. Drees J. M. Durham A. Durum D. Dutta S. Edwards Y. V. Efremenko F. Ellinghaus T. Engelmore A. Enokizono H. En'yo S. Esumi B. Fadem D. E. Fields M. Finger M. Finger, Jr. F. Fleuret S. L. Fokin Z. Fraenkel J. E. Frantz A. Franz A. D. Frawley K. Fujiwara Y. Fukao T. Fusayasu I. Garishvili A. Glenn H. Gong M. Gonin Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp Y. Gu T. Gunji H.-Å. Gustafsson J. S. Haggerty K. I. Hahn H. Hamagaki J. Hamblen R. Han J. Hanks E. P. Hartouni E. Haslum R. Hayano X. He M. Heffner T. K. Hemmick T. Hester J. C. Hill M. Hohlmann W. Holzmann K. Homma B. Hong T. Horaguchi D. Hornback S. Huang T. Ichihara R. Ichimiya J. Ide Y. Ikeda K. Imai M. Inaba D. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov D. Ivanischev B. V. Jacak J. Jia J. Jin B. M. Johnson K. S. Joo D. Jouan D. S. Jumper F. Kajihara S. Kametani N. Kamihara J. Kamin J. H. Kang J. Kapustinsky K. Karatsu D. Kawall M. Kawashima A. V. Kazantsev T. Kempel A. Khanzadeev K. M. Kijima B. I. Kim D. H. Kim D. J. Kim E. Kim E.-J. Kim S. H. Kim Y.-J. Kim E. Kinney K. Kiriluk Á. Kiss E. Kistenev L. Kochenda B. Komkov M. Konno J. Koster D. Kotchetkov A. Kozlov A. Král A. Kravitz G. J. Kunde K. Kurita M. Kurosawa Y. Kwon G. S. Kyle R. Lacey Y. S. Lai J. University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA Department of Physics University of Michigan Ann Arbor Michigan 48109-1040 USA Department of Chemistry Stony Brook University SUNY Stony Brook New York 11794-3400 USA RIKEN Nishina Center for Accelerator-Based Science Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA New Mexico State University Las Cruces New Mexico 88003 USA Kyoto University Kyoto 606-8502 Japan Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794-3800 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Collider-Accelerator Department Brookhaven National Laboratory Upton New York 11973-5000 USA Florida Institute of Technology Melbourne Florida 32901 USA University of California-Riverside Riverside California 92521 USA University of New Mexico Albuquerque New Mexico 87131 USA Abilene Christian University Abilene Texas 79699 USA Baruch College City University of New York New York New York 10010 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad Region 188300 Russia Institut für Kernphysik University of Muenster D-48149 Muenster Germany Vanderbilt University Nashville Tennessee 37235 USA Saint Petersburg State Polytechnic University St. Petersburg 195251 Russia Yonsei University IPAP Seoul 120-749 Korea Los Alamos National Lab

Measurements of the anisotropic flow coefficients v2{Ψ2},v3{Ψ3},v4{Ψ4}, and v4{Ψ2} for identified particles (π±,K±, and p+p¯) at midrapidity, obtained relative to the event planes Ψm at forward rapidities in Au + Au collisions at sNN=200GeV, are presented as a function of collision centrality and particle transverse momenta pT. The vn coefficients show characteristic patterns consistent with hydrodynamical expansion of the matter produced in the collisions. For each harmonic n, a modified valence quark-number Nq scaling [plotting vn{Ψm}/(Nq)n/2 versus transverse kinetic energies (KET)/Nq] is observed to yield a single curve for all the measured particle species for a broad range of KET. A simultaneous blast-wave model fit to the observed vn{Ψm}(pT) coefficients and published particle spectra identifies radial flow anisotropies ρn{Ψm} and spatial eccentricities sn{Ψm} at freeze-out. These are generally smaller than the initial-state participant-plane geometric eccentricities ɛn{ΨmPP} as also observed in the final eccentricity from quantum interferometry measurements with respect to the event plane.

关键词： Collective flow Particle & resonance production Relativistic heavy-ion collisions

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Evidence for Exotic Hadron Contributions to Λb0→J/ψpπ− Decays

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Physical Review Letters 2016年第8期117卷 082003-082003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 S. Bachmann J. J. Back A. Badalov C. Baesso W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter M. Baszczyk V. Batozskaya 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 M.-O. Bettler M. van Beuzekom 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 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 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 P. De Simone C. T. Dean D. Decamp M. Deckenhoff L. Del Buono M. Demmer D. Derkach O. Deschamps F. Dettori B. Dey A. Di Canto H. Dijkstra F. Dordei M. Dorigo A. Dosil Suárez A. Dovbnya K. Dre 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 Institute of Physics 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 Institution 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 Pesquis

A full amplitude analysis of Λb0→J/ψpπ− decays is performed with a data sample acquired with the LHCb detector from 7 and 8 TeV pp collisions, corresponding to an integrated luminosity of 3 fb−1. A significantly better description of the data is achieved when, in addition to the previously observed nucleon excitations N→pπ−, either the Pc(4380)+ and Pc(4450)+→J/ψp states, previously observed in Λb0→J/ψpK− decays, or the Zc(4200)−→J/ψπ− state, previously reported in B0→J/ψK+π− decays, or all three, are included in the amplitude models. The data support a model containing all three exotic states, with a significance of more than three standard deviations. Within uncertainties, the data are consistent with the Pc(4380)+ and Pc(4450)+ production rates expected from their previous observation taking account of Cabibbo suppression.

关键词： Particle decays Particle production Exotic baryons Spectroscopy

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Measurement of the Bs0→Ds(*)+Ds(*)− branching fractions

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Physical Review D 2016年第9期93卷 092008-092008页

作者： R. Aaij C. Abellán Beteta B. Adeva M. Adinolfi A. Affolder 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 A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch S. Bachmann J. J. Back A. Badalov C. Baesso W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter V. Batozskaya V. Battista A. Bay L. Beaucourt J. Beddow F. Bedeschi I. Bediaga L. J. Bel V. Bellee N. Belloli I. Belyaev E. Ben-Haim G. Bencivenni S. Benson J. Benton A. Berezhnoy R. Bernet A. Bertolin M.-O. Bettler M. van Beuzekom S. Bifani P. Billoir T. Bird A. Birnkraut A. Bizzeti T. Blake F. Blanc J. Blouw S. Blusk V. Bocci A. Bondar N. Bondar W. Bonivento S. Borghi M. Borisyak M. Borsato T. J. V. Bowcock E. Bowen C. Bozzi S. Braun M. Britsch T. Britton J. Brodzicka N. H. Brook 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 M. Chefdeville S. Chen S.-F. Cheung N. Chiapolini 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 M. Coombes S. Coquereau G. Corti M. Corvo 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 P. De Simone C.-T. Dean D. Decamp M. Deckenhoff L. Del Buono N. Déléage M. Demmer D. Derkach O. Deschamps F. Dettori B. Dey A. Di Canto F. Di Ruscio H. Dijkstra S. Donleavy F. Dordei M. Dorigo A. Dosil Suárez A. Dovbnya K. Drei European Organization for Nuclear Research (CERN) Geneva Switzerland Physik-Institut Universität Zürich Zürich Switzerland Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom Oliver Lodge Laboratory University of Liverpool Liverpool 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 Center for High Energy Physics Tsinghua University Beijing China 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 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 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 LA

The branching fraction of the decay Bs0→Ds(*)+Ds(*)− is measured using pp collision data corresponding to an integrated luminosity of 1.0 fb−1, collected using the LHCb detector at a center-of-mass energy of 7 TeV. It is found to be B(Bs0→Ds(*)+Ds(*)−)=(3.05±0.10±0.20±0.34)%, where the uncertainties are statistical, systematic, and due to the normalization channel, respectively. The branching fractions of the individual decays corresponding to the presence of one or two Ds*± are also measured. The individual branching fractions are found to be B(Bs0→Ds*±Ds∓)=(1.35±0.06±0.09±0.15)%, B(Bs0→Ds*+Ds*−)=(1.27±0.08±0.10±0.14)%. All three results are the most precise determinations to date.

关键词： Branching fraction Hadronic decays Bottom mesons Charmed mesons

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Centrality-Dependent Modification of Jet-Production Rates in Deuteron-Gold Collisions at sNN=200 GeV

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Physical Review Letters 2016年第12期116卷 122301-122301页

作者： A. Adare C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander M. Alfred A. Angerami K. Aoki N. Apadula Y. Aramaki H. Asano E. T. Atomssa R. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay N. S. Bandara B. Bannier K. N. Barish B. Bassalleck A. T. Basye S. Bathe V. Baublis C. Baumann A. Bazilevsky M. Beaumier S. Beckman S. Belikov R. Belmont R. Bennett A. Berdnikov Y. Berdnikov J. H. Bhom D. S. Blau J. S. Bok K. Boyle M. L. Brooks J. Bryslawskyj H. Buesching V. Bumazhnov G. Bunce S. Butsyk S. Campbell A. Caringi C.-H. Chen C. Y. Chi M. Chiu I. J. Choi J. B. Choi R. K. Choudhury P. Christiansen T. Chujo P. Chung O. Chvala V. Cianciolo Z. Citron B. A. Cole Z. Conesa del Valle M. Connors M. Csanád T. Csörgő T. Dahms S. Dairaku I. Danchev T. W. Danley K. Das A. Datta M. S. Daugherity G. David M. K. Dayananda K. DeBlasio K. Dehmelt A. Denisov A. Deshpande E. J. Desmond K. V. Dharmawardane O. Dietzsch A. Dion P. B. Diss J. H. Do M. Donadelli L. D’Orazio O. Drapier A. Drees K. A. Drees J. M. Durham A. Durum D. Dutta S. Edwards Y. V. Efremenko F. Ellinghaus T. Engelmore A. Enokizono H. En’yo S. Esumi B. Fadem N. Feege D. E. Fields M. Finger M. Finger, Jr. F. Fleuret S. L. Fokin Z. Fraenkel J. E. Frantz A. Franz A. D. Frawley K. Fujiwara Y. Fukao T. Fusayasu C. Gal P. Gallus P. Garg I. Garishvili H. Ge F. Giordano A. Glenn H. Gong M. Gonin Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene G. Grim M. Grosse Perdekamp T. Gunji H.-Å. Gustafsson T. Hachiya J. S. Haggerty K. I. Hahn H. Hamagaki J. Hamblen H. F. Hamilton R. Han S. Y. Han J. Hanks S. Hasegawa T. O. S. Haseler K. Hashimoto E. Haslum R. Hayano X. He M. Heffner T. K. Hemmick T. Hester J. C. Hill M. Hohlmann R. S. Hollis W. Holzmann K. Homma B. Hong T. Horaguchi D. Hornback T. Hoshino N. Hotvedt J. Huang S. Huang T. Ichihara R. Ichimiya Y. Ikeda K. Imai M. Inaba A. Iordanova D. Isenhower M. Ishihara M. Issah D. Ivanishchev Y. Iwanaga B. V. Jacak M. Jezghani J. Jia X. Jiang J. Jin B. M. Johnson T. Jones K. S. Joo D. Jouan D. S. Jumper University of Colorado Boulder Colorado 80309 USA Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA Department of Physics University of Michigan Ann Arbor Michigan 48109-1040 USA Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA RIKEN Nishina Center for Accelerator-Based Science Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA New Mexico State University Las Cruces New Mexico 88003 USA Department of Physics and Astronomy Howard University Washington DC 20059 USA Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 USA KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan Kyoto University Kyoto 606-8502 Japan Iowa State University Ames Iowa 50011 USA Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794-3800 USA Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Collider-Accelerator Department Brookhaven National Laboratory Upton New York 11973-5000 USA Florida Institute of Technology Melbourne Florida 32901 USA University of California-Riverside Riverside California 92521 USA University of New Mexico Albuquerque New Mexico 87131 USA Abilene Christian University Abilene Texas 79699 USA Baruch College City University of New York New York New York 10010 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region 188300 Russia Institut für Kernphysik University o

Jet production rates are measured in p+p and d+Au collisions at sNN=200 GeV recorded in 2008 with the PHENIX detector at the Relativistic Heavy Ion Collider. Jets are reconstructed using the R=0.3 anti-kt algorithm from energy deposits in the electromagnetic calorimeter and charged tracks in multiwire proportional chambers, and the jet transverse momentum (pT) spectra are corrected for the detector response. Spectra are reported for jets with 12nuclear-modification factor (RdAu) values for 0%–100% d+Au events are found to be consistent with unity, constraining the role of initial state effects on jet production. However, the centrality-selected RdAu values and central-to-peripheral ratios (RCP) show large, pT-dependent deviations from unity, challenging the conventional models that relate hard-process rates and soft-particle production in collisions involving nuclei.

关键词： Jets & heavy flavor physics Quark-gluon plasma Relativistic heavy-ion collisions

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Amplitude analysis of B−→D+π−π− decays

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Physical Review D 2016年第7期94卷 072001-072001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 S. Baker 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 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 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 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 Dalitz plot analysis technique is used to study the resonant substructures of B−→D+π−π− decays in a data sample corresponding to 3.0 fb−1 of pp collision data recorded by the LHCb experiment during 2011 and 2012. A model-independent analysis of the angular moments demonstrates the presence of resonances with spins 1, 2 and 3 at high D+π− mass. The data are fitted with an amplitude model composed of a quasi-model-independent function to describe the D+π− S wave together with virtual contributions from the D*(2007)0 and B*0 states, and components corresponding to the D2*(2460)0, D1*(2680)0, D3*(2760)0 and D2*(3000)0 resonances. The masses and widths of these resonances are determined together with the branching fractions for their production in B−→D+π−π− decays. The D+π− S wave has phase motion consistent with that expected due to the presence of the D0*(2400)0 state. These results constitute the first observations of the D3*(2760)0 and D2*(3000)0 resonances, with significances of 10σ and 6.6σ, respectively.

关键词： Branching fraction Hadronic decays Particle decays

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