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Search for Violations of Lorentz Invariance and CPT Symmetry in B(s)0 Mixing

Physical Review Letters 2016年第24期116卷 241601-241601页

作者： R. Aaij C. Abellán Beteta 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 A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch S. Bachmann J. J. Back A. Badalov C. Baesso S. Baker 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 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 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 F. Dordei M. Dorigo A. Dosil Suárez A 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 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 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 Maryland 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 New York 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 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

Violations of CPT symmetry and Lorentz invariance are searched for by studying interference effects in B0 mixing and in Bs0 mixing. Samples of B0→J/ψKS0 and Bs0→J/ψK+K− decays are recorded by the LHCb detector in proton-proton collisions at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb−1. No periodic variations of the particle-antiparticle mass differences are found, consistent with Lorentz invariance and CPT symmetry. Results are expressed in terms of the standard model extension parameter Δaμ with precisions of O(10−15) and O(10−14) GeV for the B0 and Bs0 systems, respectively. With no assumption on Lorentz (non)invariance, the CPT-violating parameter z in the Bs0 system is measured for the first time and found to be Re(z)=−0.022±0.033±0.005 and Im(z)=0.004±0.011±0.002, where the first uncertainties are statistical and the second systematic.

关键词： Hadron mixing Hadronic decays Bottom mesons CPT symmetry Lorentz symmetry Hadron colliders

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First observation of the rare B+→D+K+π− decay

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Physical Review D 2016年第5期93卷 051101(R)-051101(R)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. Dre 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 B+→D+K+π− decay is observed in a data sample corresponding to 3.0 fb−1 of pp collision data recorded by the LHCb experiment during 2011 and 2012. The signal significance is 8σ and the branching fraction is measured to be B(B+→D+K+π−)=(5.31±0.90±0.48±0.35)×10−6, where the uncertainties are statistical, systematic and due to the normalization mode B+→D−K+π+, respectively. The Dalitz plot appears to be dominated by broad structures. Angular distributions are exploited to search for quasi-two-body contributions from B+→D2*(2460)0K+ and B+→D+K*(892)0 decays. No significant signals are observed and upper limits are set on their branching fractions.

关键词： Hadronic decays Rare decays Bottom mesons

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Studies of the resonance structure in D0→KS0K±π∓ decays

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Physical Review D 2016年第5期93卷 052018-052018页

作者： R. Aaij 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 J. Anderson 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 I. Belyaev E. Ben-Haim G. Bencivenni S. Benson J. Benton A. Berezhnoy R. Bernet A. Bertolin M.-O. Bettler M. van Beuzekom A. Bien S. Bifani 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. Borsato T. J. V. Bowcock E. Bowen C. Bozzi S. Braun D. Brett M. Britsch T. Britton J. Brodzicka N. H. Brook E. Buchanan 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 D. Dossett A. Dovbnya K. Dreimanis L. Dufour G. 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 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 Sezione INFN di Firenze Firenze Italy Physik-Institut Universität Zürich Zürich Switzerland 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 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

Amplitude models are applied to studies of resonance structure in D0→KS0K−π+ and D0→KS0K+π− decays using pp collision data corresponding to an integrated luminosity of 3.0 fb−1 collected by the LHCb experiment. Relative magnitude and phase information is determined, and coherence factors and related observables are computed for both the whole phase space and a restricted region of 100 MeV/c2 around the K*(892)± resonance. Two formulations for the Kπ S-wave are used, both of which give a good description of the data. The ratio of branching fractions B(D0→KS0K+π−)/B(D0→KS0K−π+) is measured to be 0.655±0.004(stat)±0.006(syst) over the full phase space and 0.370±0.003(stat)±0.012(syst) in the restricted region. A search for CP violation is performed using the amplitude models and no significant effect is found. Predictions from SU(3) flavor symmetry for K*(892)K amplitudes of different charges are compared with the amplitude model results.

关键词： Hadronic decays Charmed mesons Light mesons

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Study of Bc+ decays to the K+K−π+ final state and evidence for the decay Bc+→χc0π+

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Physical Review D 2016年第9期94卷 091102(R)-091102(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 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 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. 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 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)) 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 Bra

A study of Bc+→K+K−π+ decays is performed for the first time using data corresponding to an integrated luminosity of 3.0 fb−1 collected by the LHCb experiment in pp collisions at center-of-mass energies of 7 and 8 TeV. Evidence for the decay Bc+→χc0(→K+K−)π+ is reported with a significance of 4.0 standard deviations, giving σ(Bc+)σ(B+)×B(Bc+→χc0π+)=(9.8−3.0+3.4(stat)±0.8(syst))×10−6. Here B denotes a branching fraction while σ(Bc+) and σ(B+) are the production cross sections for Bc+ and B+ mesons. An indication of b¯c weak annihilation is found for the region m(K−π+)<1.834 GeV/c2, with a significance of 2.4 standard deviations.

关键词： Branching fraction Hadronic decays Rare decays Bottom mesons Charmed mesons Hadron colliders

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Measurements of double-helicity asymmetries in inclusive J/ψ production in longitudinally polarized p+p collisions at s=510 GeV

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Physical Review D 2016年第11期94卷 112008-112008页

作者： A. Adare C. Aidala N. N. Ajitanand Y. Akiba R. Akimoto M. Alfred N. Apadula Y. Aramaki H. Asano E. T. Atomssa T. C. Awes B. Azmoun V. Babintsev M. Bai N. S. Bandara B. Bannier K. N. Barish S. Bathe A. Bazilevsky M. Beaumier S. Beckman R. Belmont A. Berdnikov Y. Berdnikov D. Black D. S. Blau J. S. Bok K. Boyle M. L. Brooks J. Bryslawskyj H. Buesching V. Bumazhnov S. Campbell C.-H. Chen C. Y. Chi M. Chiu I. J. Choi J. B. Choi T. Chujo Z. Citron M. Csanád T. Csörgő T. W. Danley A. Datta M. S. Daugherity G. David K. DeBlasio K. Dehmelt A. Denisov A. Deshpande E. J. Desmond L. Ding A. Dion P. B. Diss J. H. Do A. Drees K. A. Drees J. M. Durham A. Durum A. Enokizono H. En’yo S. Esumi B. Fadem N. Feege D. E. Fields M. Finger M. Finger, Jr. S. L. Fokin J. E. Frantz A. Franz A. D. Frawley C. Gal P. Gallus P. Garg H. Ge F. Giordano A. Glenn Y. Goto N. Grau S. V. Greene M. Grosse Perdekamp Y. Gu T. Gunji H. Guragain T. Hachiya J. S. Haggerty K. I. Hahn H. Hamagaki H. F. Hamilton S. Y. Han J. Hanks S. Hasegawa T. O. S. Haseler K. Hashimoto X. He T. K. Hemmick J. C. Hill R. S. Hollis K. Homma B. Hong T. Hoshino N. Hotvedt J. Huang S. Huang Y. Ikeda K. Imai Y. Imazu M. Inaba A. Iordanova D. Isenhower D. Ivanishchev B. V. Jacak S. J. Jeon M. Jezghani J. Jia X. Jiang B. M. Johnson E. Joo K. S. Joo D. Jouan D. S. Jumper S. Kanda J. H. Kang J. S. Kang D. Kawall A. V. Kazantsev J. A. Key V. Khachatryan A. Khanzadeev K. Kihara C. Kim D. H. Kim D. J. Kim E.-J. Kim G. W. Kim H.-J. Kim M. Kim Y. K. Kim B. Kimelman E. Kistenev R. Kitamura J. Klatsky D. Kleinjan P. Kline T. Koblesky M. Kofarago B. Komkov J. Koster D. Kotov K. Kurita M. Kurosawa Y. Kwon R. Lacey J. G. Lajoie A. Lebedev K. B. Lee S. Lee S. H. Lee M. J. Leitch M. Leitgab X. Li S. H. Lim M. X. Liu D. Lynch Y. I. Makdisi M. Makek A. Manion V. I. Manko E. Mannel M. McCumber P. L. McGaughey D. McGlinchey C. McKinney A. Meles M. Mendoza B. Meredith Y. Miake A. C. Mignerey A. J. Miller A. Milov D. K. Mishra J. T. Mitchell S. Miyasaka S. Mizuno A. K. Mohanty P. Montuenga T. Moon D. University of Colorado Boulder Colorado 80309 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 Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan Department of Physics and Astronomy Howard University Washington DC 20059 USA Iowa State University Ames Iowa 50011 USA Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794-3800 USA Kyoto University Kyoto 606-8502 Japan 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 Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA University of California-Riverside Riverside California 92521 USA Baruch College City University of New York New York New York 10010 USA Saint Petersburg State Polytechnic University St. Petersburg 195251 Russia National Research Center “Kurchatov Institute” Moscow 123098 Russia New Mexico State University Las Cruces New Mexico 88003 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Columbia University New York New York 10027 USA and Nevis Laboratories Irvington New York 10533 USA University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Chonbuk National University Jeonju 561-756 Korea Center for Integrated Research in Fundamental Science and Engineering University of Tsukuba Tsukuba Ibaraki 305 Japan Weizmann Institute Rehovot 7610

We report the double-helicity asymmetry, ALLJ/ψ, in inclusive J/ψ production at forward rapidity as a function of transverse momentum pT and rapidity |y|. The data analyzed were taken during s=510 GeV longitudinally polarized p+p collisions at the Relativistic Heavy Ion Collider in the 2013 run using the PHENIX detector. At this collision energy, J/ψ particles are predominantly produced through gluon-gluon scatterings, thus ALLJ/ψ is sensitive to the gluon polarization inside the proton. We measured ALLJ/ψ by detecting the decay daughter muon pairs μ+μ− within the PHENIX muon spectrometers in the rapidity range 1.2<|y|<2.2. In this kinematic range, we measured the ALLJ/ψ to be 0.012±0.010 (stat) ±0.003 (syst). The ALLJ/ψ can be expressed to be proportional to the product of the gluon polarization distributions at two distinct ranges of Bjorken x: one at moderate range x≈5×10−2 where recent data of jet and π0 double helicity spin asymmetries have shown evidence for significant gluon polarization, and the other one covering the poorly known small-x region x≈2×10−3. Thus our new results could be used to further constrain the gluon polarization for x<5×10−2.

关键词： Hadron-hadron interactions Leptonic, semileptonic & radiative decays Polarization phenomena Gluons

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Scaling properties of fractional momentum loss of high-pT hadrons in nucleus-nucleus collisions at sNN from 62.4 GeV to 2.76 TeV

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Physical Review C 2016年第2期93卷 024911-024911页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba R. Akimoto H. Al-Bataineh J. Alexander M. Alfred H. Al-Ta'ani A. Angerami K. Aoki N. Apadula L. Aphecetche Y. Aramaki R. Armendariz S. H. Aronson J. Asai H. Asano E. C. Aschenauer E. T. Atomssa R. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay A. Baldisseri N. S. Bandara B. Bannier K. N. Barish P. D. Barnes B. Bassalleck A. T. Basye S. Bathe S. Batsouli V. Baublis C. Baumann S. Baumgart A. Bazilevsky M. Beaumier S. Beckman S. Belikov R. Belmont R. Bennett A. Berdnikov Y. Berdnikov A. A. Bickley D. S. Blau J. G. Boissevain J. S. Bok H. Borel K. Boyle M. L. Brooks J. Bryslawskyj H. Buesching V. Bumazhnov G. Bunce S. Butsyk C. M. Camacho S. Campbell P. Castera B. S. Chang J.-L. Charvet C.-H. Chen S. Chernichenko C. Y. Chi J. Chiba M. Chiu I. J. Choi J. B. Choi S. Choi R. K. Choudhury P. Christiansen T. Chujo P. Chung A. Churyn O. Chvala V. Cianciolo Z. Citron C. R. Cleven B. A. Cole M. P. Comets M. Connors P. Constantin M. Csanád T. Csörgő T. Dahms S. Dairaku I. Danchev T. W. Danley K. Das A. Datta M. S. Daugherity G. David M. B. Deaton K. DeBlasio K. Dehmelt H. Delagrange A. Denisov D. d'Enterria A. Deshpande E. J. Desmond K. V. Dharmawardane O. Dietzsch L. Ding A. Dion P. B. Diss J. H. Do M. Donadelli L. D'Orazio O. Drapier A. Drees K. A. Drees A. K. Dubey J. M. Durham A. Durum D. Dutta V. Dzhordzhadze S. Edwards Y. V. Efremenko J. Egdemir F. Ellinghaus W. S. Emam T. Engelmore A. Enokizono H. En'yo S. Esumi K. O. Eyser 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 S. Gadrat K. Gainey C. Gal P. Gallus P. Garg A. Garishvili I. Garishvili H. Ge F. Giordano A. Glenn H. Gong X. Gong M. Gonin J. Gosset Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji L. Guo H.-Å. Gustafsson T. Hachiya A. Hadj Henni C. Haegemann J. S. Haggerty K. I. Hahn H. Hamagaki J. Hamblen H. F. Hamilton R. Han S. Y. Han J. Han University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 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 Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan New Mexico State University Las Cruces New Mexico 88003 USA Department of Physics and Astronomy Howard University Washington DC 20059 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 SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722-44307 Nantes France Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Oak Ridge National Laboratory Oak Ridge Tennessee 37831 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 Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California-Riverside Riverside California 92521 USA University of New Mexic

Measurements of the fractional momentum loss (Sloss≡δpT/pT) of high-transverse-momentum-identified hadrons in heavy-ion collisions are presented. Using π0 in Au+Au and Cu+Cu collisions at sNN=62.4 and 200 GeV measured by the PHENIX experiment at the Relativistic Heavy Ion Collider and and charged hadrons in Pb+Pb collisions measured by the ALICE experiment at the Large Hadron Collider, we studied the scaling properties of Sloss as a function of a number of variables: the number of participants, Npart, the number of quark participants, Nqp, the charged-particle density, dNch/dη, and the Bjorken energy density times the equilibration time, ɛBjτ0. We find that the pT, where Sloss has its maximum, varies both with centrality and collision energy. Above the maximum, Sloss tends to follow a power-law function with all four scaling variables. The data at sNN=200 GeV and 2.76 TeV, for sufficiently high particle densities, have a common scaling of Sloss with dNch/dη and ɛBjτ0, lending insight into the physics of parton energy loss.

关键词： Hard scattering Relativistic heavy-ion collisions Hadrons nuclear data analysis & compilation

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Azimuthally anisotropic emission of low-momentum direct photons in Au + Au collisions at sNN=200 GeV

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Physical Review C 2016年第6期94卷 064901-064901页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba R. Akimoto H. Al-Bataineh J. Alexander M. Alfred H. Al-Ta'ani A. Angerami K. Aoki N. Apadula Y. Aramaki H. Asano E. C. Aschenauer 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 S. Baumgart A. Bazilevsky M. Beaumier S. Beckman S. Belikov R. Belmont R. Bennett A. Berdnikov Y. Berdnikov A. A. Bickley D. S. Blau J. S. Bok K. Boyle M. L. Brooks J. Bryslawskyj H. Buesching V. Bumazhnov G. Bunce S. Butsyk C. M. Camacho S. Campbell P. Castera C.-H. Chen C. Y. Chi M. Chiu I. J. Choi J. B. Choi S. 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 T. W. Danley K. Das A. Datta M. S. Daugherity G. David K. DeBlasio K. Dehmelt A. Denisov A. Deshpande E. J. Desmond K. V. Dharmawardane O. Dietzsch L. Ding 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 K. O. Eyser 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 K. Gainey C. Gal P. Gallus P. Garg A. Garishvili I. Garishvili H. Ge F. Giordano A. Glenn H. Gong X. Gong M. Gonin Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji L. Guo 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 E. P. Hartouni 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 Y. Hori D. Hornback T. Hoshino N. Hotvedt J. Huang S. Huang T. Ichihara R. Ichimiya J. Ide H. Iinuma Y. Ikeda K. Imai J. Imrek M. Inaba A. Io University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Los Alamos National Laboratory Los Alamos New Mexico 87545 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 Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan New Mexico State University Las Cruces New Mexico 88003 USA Department of Physics and Astronomy Howard University Washington D.C. 20059 USA Columbia University New York New York 10027 USA 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 Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Oak Ridge National Laboratory Oak Ridge Tennessee 37831 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

The PHENIX experiment at the BNL Relativistic Heavy Ion Collider has measured second- and third-order Fourier coefficients of the azimuthal distributions of direct photons emitted at midrapidity in Au+Au collisions at sNN=200 GeV for various collision centralities. Combining two different analysis techniques, results were obtained in the transverse momentum range of 0.4

关键词： Photon, lepton & quark production Relativistic heavy-ion collisions

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Measurement of higher cumulants of net-charge multiplicity distributions in Au+Au collisions at sNN=7.7–200GeV

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Physical Review C 2016年第1期93卷 011901(R)-011901(R)页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba R. Akimoto H. Al-Bataineh J. Alexander H. Al-Ta'ani A. Angerami K. Aoki N. Apadula Y. Aramaki H. Asano E. C. Aschenauer E. T. Atomssa R. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay B. Bannier K. N. Barish B. Bassalleck A. T. Basye S. Bathe V. Baublis C. Baumann S. Baumgart A. Bazilevsky S. Belikov R. Belmont R. Bennett A. Berdnikov Y. Berdnikov A. A. Bickley D. Black D. S. Blau J. S. Bok K. Boyle M. L. Brooks J. Bryslawskyj H. Buesching V. Bumazhnov G. Bunce S. Butsyk C. M. Camacho S. Campbell P. Castera C.-H. Chen C. Y. Chi M. Chiu I. J. Choi J. B. Choi S. Choi R. K. Choudhury P. Christiansen T. Chujo P. Chung O. Chvala V. Cianciolo Z. Citron B. A. Cole M. Connors P. Constantin N. Cronin N. Crossette M. Csanád T. Csörgő T. Dahms S. Dairaku I. Danchev K. Das A. Datta M. S. Daugherity G. David K. Dehmelt A. Denisov A. Deshpande E. J. Desmond K. V. Dharmawardane O. Dietzsch L. Ding A. Dion 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 K. O. Eyser 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 K. Gainey C. Gal P. Garg A. Garishvili I. Garishvili F. Giordano A. Glenn H. Gong X. Gong M. Gonin Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp Y. Gu T. Gunji L. Guo H.-Å. Gustafsson T. Hachiya J. S. Haggerty K. I. Hahn H. Hamagaki J. Hamblen R. Han J. Hanks E. P. Hartouni K. Hashimoto E. Haslum R. Hayano S. Hayashi 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 Y. Hori D. Hornback S. Huang T. Ichihara R. Ichimiya J. Ide H. Iinuma Y. Ikeda K. Imai Y. Imazu J. Imrek M. Inaba A. Iordanova D. Isenhower M. Ishihara A. Isinhue T. Isobe M. Issah A. Isupov D. Ivanishchev B. V. Jacak M. Javani J. Jia X. Jiang J. Jin B. University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Los Alamos National Laboratory Los Alamos New Mexico 87545 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 Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan New Mexico State University Las Cruces New Mexico 88003 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 Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Oak Ridge National Laboratory Oak Ridge Tennessee 37831 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 regi

We report the measurement of cumulants (Cn,n=1,...,4) of the net-charge distributions measured within pseudorapidity (|η|<0.35) in Au+Au collisions at sNN=7.7–200GeV with the PHENIX experiment at the Relativistic Heavy Ion Collider. The ratios of cumulants (e.g., C1/C2, C3/C1) of the net-charge distributions, which can be related to volume independent susceptibility ratios, are studied as a function of centrality and energy. These quantities are important to understand the quantum-chromodynamics phase diagram and possible existence of a critical end point. The measured values are very well described by expectation from negative binomial distributions. We do not observe any nonmonotonic behavior in the ratios of the cumulants as a function of collision energy. The measured values of C1/C2 and C3/C1 can be directly compared to lattice quantum-chromodynamics calculations and thus allow extraction of both the chemical freeze-out temperature and the baryon chemical potential at each center-of-mass energy. The extracted baryon chemical potentials are in excellent agreement with a thermal-statistical analysis model.

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

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Single electron yields from semileptonic charm and bottom hadron decays in Au+Au collisions at sNN=200 GeV

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Physical Review C 2016年第3期93卷 034904-034904页

作者： A. Adare C. Aidala N. N. Ajitanand Y. Akiba R. Akimoto J. Alexander M. Alfred K. Aoki N. Apadula Y. Aramaki H. Asano E. C. Aschenauer E. T. Atomssa T. C. Awes B. Azmoun V. Babintsev M. Bai N. S. Bandara B. Bannier K. N. Barish B. Bassalleck S. Bathe V. Baublis S. Baumgart A. Bazilevsky M. Beaumier S. Beckman R. Belmont A. Berdnikov Y. Berdnikov D. Black D. S. Blau J. S. Bok K. Boyle M. L. Brooks J. Bryslawskyj H. Buesching V. Bumazhnov S. Butsyk S. Campbell C.-H. Chen C. Y. Chi M. Chiu I. J. Choi J. B. Choi S. Choi R. K. Choudhury P. Christiansen T. Chujo O. Chvala V. Cianciolo Z. Citron B. A. Cole M. Connors N. Cronin N. Crossette M. Csanád T. Csörgő S. Dairaku T. W. Danley A. Datta M. S. Daugherity G. David K. DeBlasio K. Dehmelt A. Denisov A. Deshpande E. J. Desmond O. Dietzsch L. Ding 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 S. Edwards Y. V. Efremenko T. Engelmore A. Enokizono S. Esumi K. O. Eyser B. Fadem N. Feege D. E. Fields M. Finger M. Finger, Jr. F. Fleuret S. L. Fokin J. E. Frantz A. Franz A. D. Frawley Y. Fukao T. Fusayasu K. Gainey C. Gal P. Gallus P. Garg A. Garishvili I. Garishvili H. Ge F. Giordano A. Glenn X. Gong M. Gonin Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp Y. Gu T. Gunji T. Hachiya J. S. Haggerty K. I. Hahn H. Hamagaki H. F. Hamilton S. Y. Han J. Hanks S. Hasegawa T. O. S. Haseler K. Hashimoto R. Hayano S. Hayashi X. He T. K. Hemmick T. Hester J. C. Hill R. S. Hollis K. Homma B. Hong T. Horaguchi T. Hoshino N. Hotvedt J. Huang S. Huang T. Ichihara H. Iinuma Y. Ikeda K. Imai Y. Imazu J. Imrek M. Inaba A. Iordanova D. Isenhower A. Isinhue D. Ivanishchev B. V. Jacak M. Javani M. Jezghani J. Jia X. Jiang B. M. Johnson K. S. Joo D. Jouan D. S. Jumper J. Kamin S. Kanda B. H. Kang J. H. Kang J. S. Kang J. Kapustinsky K. Karatsu D. Kawall A. V. Kazantsev T. Kempel J. A. Key V. Khachatryan P. K. Khandai A. Khanzadeev K. M. Kijima B. I. Kim C. Kim D. J. Kim E.-J. Kim G. W. Kim M. Kim Y.-J. Kim Y. K. Kim University of Colorado Boulder Colorado 80309 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 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 Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan Department of Physics and Astronomy Howard University Washington DC 20059 USA KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan Iowa State University Ames Iowa 50011 USA Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794-3800 USA Kyoto University Kyoto 606-8502 Japan Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 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 Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA University of California-Riverside Riverside California 92521 USA University of New Mexico Albuquerque New Mexico 87131 USA Baruch College City University of New York New York New York 10010 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad Region 188300 Russia Vanderbilt University Nashville Tennessee 37235 USA Saint Petersburg State Polytechnic University St. Petersburg 195251 Russia National Research Center “Kurchatov Institute ” Moscow 123098 Russia New Mexico State University Las Cruces New Mexico 88003 USA Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 U

The PHENIX Collaboration at the Relativistic Heavy Ion Collider has measured open heavy flavor production in minimum bias Au+Au collisions at sNN=200 GeV via the yields of electrons from semileptonic decays of charm and bottom hadrons. Previous heavy flavor electron measurements indicated substantial modification in the momentum distribution of the parent heavy quarks owing to the quark-gluon plasma created in these collisions. For the first time, using the PHENIX silicon vertex detector to measure precision displaced tracking, the relative contributions from charm and bottom hadrons to these electrons as a function of transverse momentum are measured in Au+Au collisions. We compare the fraction of electrons from bottom hadrons to previously published results extracted from electron-hadron correlations in p+p collisions at sNN=200 GeV and find the fractions to be similar within the large uncertainties on both measurements for pT>4GeV/c. We use the bottom electron fractions in Au+Au and p+p along with the previously measured heavy flavor electron RAA to calculate the RAA for electrons from charm and bottom hadron decays separately. We find that electrons from bottom hadron decays are less suppressed than those from charm for the region 3

关键词： Particle & resonance production Photon, lepton & quark production Relativistic heavy-ion collisions

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Dielectron production in Au + Au collisions at sNN=200 GeV

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Physical Review C 2016年第1期93卷 014904-014904页

作者： A. Adare C. Aidala N. N. Ajitanand Y. Akiba R. Akimoto J. Alexander M. Alfred H. Al-Ta'ani A. Angerami K. Aoki N. Apadula Y. Aramaki H. Asano E. C. Aschenauer E. T. Atomssa R. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai N. S. Bandara B. Bannier K. N. Barish B. Bassalleck S. Bathe V. Baublis S. Baumgart A. Bazilevsky M. Beaumier S. Beckman R. Belmont A. Berdnikov Y. Berdnikov D. S. Blau J. S. Bok K. Boyle M. L. Brooks J. Bryslawskyj H. Buesching V. Bumazhnov S. Butsyk S. Campbell P. Castera C.-H. Chen C. Y. Chi M. Chiu I. J. Choi J. B. Choi S. Choi R. K. Choudhury P. Christiansen T. Chujo O. Chvala V. Cianciolo Z. Citron B. A. Cole M. Connors M. Csanád T. Csörgő S. Dairaku T. W. Danley A. Datta M. S. Daugherity G. David K. DeBlasio K. Dehmelt A. Denisov A. Deshpande E. J. Desmond K. V. Dharmawardane O. Dietzsch L. Ding 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 S. Edwards Y. V. Efremenko T. Engelmore A. Enokizono S. Esumi K. O. Eyser B. Fadem N. Feege D. E. Fields M. Finger M. Finger, Jr. F. Fleuret S. L. Fokin J. E. Frantz A. Franz A. D. Frawley Y. Fukao T. Fusayasu K. Gainey C. Gal P. Gallus P. Garg A. Garishvili I. Garishvili H. Ge F. Giordano A. Glenn X. Gong M. Gonin Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji L. Guo H.-Å. Gustafsson T. Hachiya J. S. Haggerty K. I. Hahn H. Hamagaki H. F. Hamilton S. Y. Han J. Hanks S. Hasegawa T. O. S. Haseler K. Hashimoto E. Haslum R. Hayano X. He T. K. Hemmick T. Hester J. C. Hill R. S. Hollis K. Homma B. Hong T. Horaguchi Y. Hori T. Hoshino N. Hotvedt J. Huang S. Huang T. Ichihara H. Iinuma Y. Ikeda K. Imai J. Imrek M. Inaba A. Iordanova D. Isenhower M. Issah D. Ivanishchev B. V. Jacak M. Javani M. Jezghani J. Jia X. Jiang B. M. Johnson K. S. Joo D. Jouan D. S. Jumper J. Kamin S. Kanda S. Kaneti B. H. Kang J. H. Kang J. S. Kang J. Kapustinsky K. Karatsu M. Kasai D. Kawall A. V. Kazantsev T. Kempel J. A. Key V. Khachatryan A. Khanzadeev K. M. Kijima B. I. Kim C. Kim D University of Colorado Boulder Colorado 80309 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 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 Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan Department of Physics and Astronomy Howard University Washington DC 20059 USA New Mexico State University Las Cruces New Mexico 88003 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 Iowa State University Ames Iowa 50011 USA Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794-3800 USA Kyoto University Kyoto 606-8502 Japan Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 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 Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA University of California-Riverside Riverside California 92521 USA University of New Mexico Albuquerque New Mexico 87131 USA Baruch College City University of New York New York New York 10010 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad Region 188300 Russia Vanderbilt University Nashville Tennessee 37235 USA Saint Petersburg State Polytechnic University St. Petersburg 195251 Russia National Research Center “Kurchatov Institute ” Moscow 123098 Rus

We present measurements of e+e− production at midrapidity in Au+Au collisions at sNN=200 GeV. The invariant yield is studied within the PHENIX detector acceptance over a wide range of mass (mee<5 GeV/c2) and pair transverse momentum (pT<5 GeV/c) for minimum bias and for five centrality classes. The e+e− yield is compared to the expectations from known sources. In the low-mass region (mee=0.30–0.76 GeV/c2) there is an enhancement that increases with centrality and is distributed over the entire pair pT range measured. It is significantly smaller than previously reported by the PHENIX experiment and amounts to 2.3±0.4(stat)±0.4(syst)±0.2(model) or to 1.7±0.3(stat)±0.3(syst)±0.2(model) for minimum bias collisions when the open heavy-flavor contribution is calculated with pythia or mc@nlo, respectively. The inclusive mass and pT distributions, as well as the centrality dependence, are well reproduced by model calculations where the enhancement mainly originates from the melting of the ρ meson resonance as the system approaches chiral symmetry restoration. In the intermediate-mass region (mee=1.2–2.8 GeV/c2), the data hint at a significant contribution in addition to the yield from the semileptonic decays of heavy-flavor mesons.

关键词： Photon, lepton & quark production Relativistic heavy-ion collisions

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