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Measurement of CP violation and the Bs0 meson decay width difference with Bs0→J/ψK+K− and Bs0→J/ψπ+π− decays

Physical Review D 2013年第11期87卷 112010-112010页

作者： R. Aaij C. Abellan Beteta B. Adeva M. Adinolfi C. Adrover A. Affolder Z. Ajaltouni J. Albrecht F. Alessio M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr. S. Amato S. Amerio Y. Amhis L. Anderlini J. Anderson R. Andreassen R. B. Appleby O. Aquines Gutierrez F. Archilli A. Artamonov M. Artuso E. Aslanides G. Auriemma S. Bachmann J. J. Back C. Baesso V. Balagura W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter Th. Bauer A. Bay J. Beddow F. Bedeschi I. Bediaga S. Belogurov K. Belous I. Belyaev E. Ben-Haim M. Benayoun G. Bencivenni S. Benson J. Benton A. Berezhnoy R. Bernet M.-O. Bettler M. van Beuzekom A. Bien S. Bifani T. Bird A. Bizzeti P. M. Bjørnstad T. Blake F. Blanc J. Blouw S. Blusk V. Bocci A. Bondar N. Bondar W. Bonivento S. Borghi A. Borgia T. J. V. Bowcock E. Bowen C. Bozzi T. Brambach J. van den Brand J. Bressieux D. Brett M. Britsch T. Britton N. H. Brook H. Brown I. Burducea A. Bursche G. Busetto J. Buytaert S. Cadeddu O. Callot M. Calvi M. Calvo Gomez A. Camboni P. Campana A. Carbone G. Carboni R. Cardinale A. Cardini H. Carranza-Mejia L. Carson K. Carvalho Akiba G. Casse M. Cattaneo Ch. Cauet M. Charles Ph. Charpentier P. Chen N. Chiapolini M. Chrzaszcz K. Ciba X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier C. Coca V. Coco J. Cogan E. Cogneras P. Collins A. Comerma-Montells A. Contu A. Cook M. Coombes S. Coquereau G. Corti B. Couturier G. A. Cowan D. C. Craik S. Cunliffe R. Currie C. D’Ambrosio P. David P. N. Y. David I. De Bonis K. De Bruyn S. De Capua M. De Cian J. M. De Miranda L. De Paula W. De Silva P. De Simone D. Decamp M. Deckenhoff L. Del Buono D. Derkach O. Deschamps F. Dettori A. Di Canto H. Dijkstra M. Dogaru S. Donleavy F. Dordei A. Dosil Suárez D. Dossett A. Dovbnya F. Dupertuis R. Dzhelyadin A. Dziurda A. Dzyuba S. Easo U. Egede V. Egorychev S. Eidelman D. van Eijk S. Eisenhardt U. Eitschberger R. Ekelhof L. Eklund I. El Rifai Ch. Elsasser D. Elsby A. Falabella C. Färber G. Fardell C. Farinelli S. Farry V. Fave D. Ferguson V. Fern Nikhef National Institute for Subatomic Physics Amsterdam The Netherlands Universitat de Barcelona Barcelona Spain Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Oliver Lodge Laboratory University of Liverpool Liverpool United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France Fakultät Physik Technische Universität Dortmund Dortmund Germany European Organization for Nuclear Research (CERN) Geneva Switzerland School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Sezione INFN di Roma La Sapienza Roma Italy 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 Sezione INFN di Firenze Firenze Italy Physik-Institut Universität Zürich Zürich Switzerland University of Cincinnati Cincinnati Ohio USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Max-Planck-Institut für Kernphysik (MPIK) Heidelberg Germany Laboratori Nazionali dell’INFN di Frascati Frascati Italy Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York USA Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Department of Physics University of Warwick Coventry United Kingdom Institute of Theoretical and Experimental Physics (ITEP) Moscow Russia Sezione INFN di Ferrara Ferrara Italy Cavendish Laboratory University of Cambridge Cambridge United Kingdom Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Sezione INFN di Pisa Pisa Italy Centro Brasileiro de Pesquisas Físicas (CBPF) Rio de Janeiro Brazil LPNHE Université Pierre et Marie Curie Université Paris Diderot CNRS/IN2P3 Paris France

The time-dependent CP asymmetry in Bs0→J/ψK+K− decays is measured using pp collision data at s=7 TeV, corresponding to an integrated luminosity of 1.0 fb−1, collected with the LHCb detector. The decay-time distribution is characterized by the decay widths ΓL and ΓH of the light and heavy mass eigenstates of the Bs0−B¯s0 system and by a CP-violating phase ϕs. In a sample of 27 617 Bs0→J/ψK+K− decays, where the dominant contribution comes from Bs0→J/ψϕ decays, these parameters are measured to be ϕs=0.07±0.09(stat)±0.01(syst) rad, Γs≡(ΓL+ΓH)/2=0.663±0.005(stat)±0.006(syst) ps−1, and ΔΓs≡ΓL−ΓH=0.100±0.016(stat)±0.003(syst) ps−1, corresponding to the single most precise determination of ϕs, ΔΓs, and Γs. The result of performing a combined analysis with Bs0→J/ψπ+π− decays gives ϕs=0.01±0.07(stat)±0.01(syst) rad, Γs=0.661±0.004(stat)±0.006(syst) ps−1, and ΔΓs=0.106±0.011(stat)±0.007(syst) ps−1. All measurements are in agreement with the Standard Model predictions.

关键词： CP violation (nuclear physics) PHYSICAL measurements SYMMETRY (physics) RADIOACTIVE decay STANDARD model (nuclear physics) LARGE Hadron Collider (France & Switzerland) PARAMETER estimation

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Observation of Bc+→J/ψDs+ and Bc+→J/ψDs*+ decays

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Physical Review D 2013年第11期87卷 112012-112012页

作者： R. Aaij C. Abellan Beteta B. Adeva M. Adinolfi C. Adrover A. Affolder Z. Ajaltouni J. Albrecht F. Alessio M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr. S. Amato S. Amerio Y. Amhis L. Anderlini J. Anderson R. Andreassen R. B. Appleby O. Aquines Gutierrez F. Archilli A. Artamonov M. Artuso E. Aslanides G. Auriemma S. Bachmann J. J. Back C. Baesso V. Balagura W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter Th. Bauer A. Bay J. Beddow F. Bedeschi I. Bediaga S. Belogurov K. Belous I. Belyaev E. Ben-Haim M. Benayoun G. Bencivenni S. Benson J. Benton A. Berezhnoy R. Bernet M.-O. Bettler M. van Beuzekom A. Bien S. Bifani T. Bird A. Bizzeti P. M. Bjørnstad T. Blake F. Blanc J. Blouw S. Blusk V. Bocci A. Bondar N. Bondar W. Bonivento S. Borghi A. Borgia T. J. V. Bowcock E. Bowen C. Bozzi T. Brambach J. van den Brand J. Bressieux D. Brett M. Britsch T. Britton N. H. Brook H. Brown I. Burducea A. Bursche G. Busetto J. Buytaert S. Cadeddu O. Callot M. Calvi M. Calvo Gomez A. Camboni P. Campana D. Campora Perez A. Carbone G. Carboni R. Cardinale A. Cardini H. Carranza-Mejia L. Carson K. Carvalho Akiba G. Casse M. Cattaneo Ch. Cauet M. Charles Ph. Charpentier P. Chen N. Chiapolini M. Chrzaszcz K. Ciba X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier C. Coca V. Coco J. Cogan E. Cogneras P. Collins A. Comerma-Montells A. Contu A. Cook M. Coombes S. Coquereau G. Corti B. Couturier G. A. Cowan D. C. Craik S. Cunliffe R. Currie C. D’Ambrosio P. David P. N. Y. David A. Davis I. De Bonis K. De Bruyn S. De Capua M. De Cian J. M. De Miranda L. De Paula W. De Silva P. De Simone D. Decamp M. Deckenhoff L. Del Buono D. Derkach O. Deschamps F. Dettori A. Di Canto H. Dijkstra M. Dogaru S. Donleavy F. Dordei A. Dosil Suárez D. Dossett A. Dovbnya F. Dupertuis R. Dzhelyadin A. Dziurda A. Dzyuba S. Easo U. Egede V. Egorychev S. Eidelman D. van Eijk S. Eisenhardt U. Eitschberger R. Ekelhof L. Eklund I. El Rifai Ch. Elsasser D. Elsby A. Falabella C. Färber G. Fardell C. Farinelli S. Farry V Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Universitat de Barcelona Barcelona Spain Universidad de Santiago de Compostela Santiago de Compostela Spain H. H. Wills Physics Laboratory University of Bristol Bristol United Kingdom CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Oliver Lodge Laboratory University of Liverpool Liverpool United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France Fakultät Physik Technische Universität Dortmund Dortmund Germany European Organization for Nuclear Research (CERN) Geneva Switzerland School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Sezione INFN di Roma La Sapienza Roma Italy 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 Sezione INFN di Firenze Firenze Italy Physik-Institut Universität Zürich Zürich Switzerland University of Cincinnati Cincinnati Ohio USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Max-Planck-Institut für Kernphysik (MPIK) Heidelberg Germany Laboratori Nazionali dell’INFN di Frascati Frascati Italy Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York USA Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Department of Physics University of Warwick Coventry United Kingdom Institute of Theoretical and Experimental Physics (ITEP) Moscow Russia Sezione INFN di Ferrara Ferrara Italy Cavendish Laboratory University of Cambridge Cambridge United Kingdom Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Sezione INFN di Pisa Pisa Italy Centro Brasileiro de Pesquisas Físicas (CBPF) Rio de Janeiro Brazil LPNHE Université Pierre et Marie Curie Université Paris Diderot CNRS/IN2P3 Paris France Sch

The decays Bc+→J/ψDs+ and Bc+→J/ψDs*+ are observed for the first time using a dataset, corresponding to an integrated luminosity of 3 fb−1, collected by the LHCb experiment in proton-proton collisions at center-of-mass energies of s=7 and 8 TeV. The statistical significance for both signals is in excess of 9 standard deviations. The following ratios of branching fractions are measured to be B(Bc+→J/ψDs+)B(Bc+→J/ψπ+)=2.90±0.57±0.24, B(Bc+→J/ψDs*+)B(Bc+→J/ψDs+)=2.37±0.56±0.10, where the first uncertainties are statistical and the second systematic. The mass of the Bc+ meson is measured to be mBc+=6276.28±1.44(stat)±0.36(syst) MeV/c2, using the Bc+→J/ψDs+ decay mode.

关键词： LARGE Hadron Collider (France & Switzerland) PROTON-proton interactions ATOMIC mass nuclear physics -- Experiments UNCERTAINTY (Information theory) MESONS

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Measurement of the branching fractions of the decays Bs0→D¯0K−π+ and B0→D¯0K+π−

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Physical Review D 2013年第11期87卷 112009-112009页

作者： R. Aaij C. Abellan Beteta B. Adeva M. Adinolfi C. Adrover A. Affolder Z. Ajaltouni J. Albrecht F. Alessio M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr. S. Amato S. Amerio Y. Amhis L. Anderlini J. Anderson R. Andreassen R. B. Appleby O. Aquines Gutierrez F. Archilli A. Artamonov M. Artuso E. Aslanides G. Auriemma S. Bachmann J. J. Back C. Baesso V. Balagura W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter Th. Bauer A. Bay J. Beddow F. Bedeschi I. Bediaga S. Belogurov K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson J. Benton A. Berezhnoy R. Bernet M.-O. Bettler M. van Beuzekom A. Bien S. Bifani T. Bird A. Bizzeti P. M. Bjørnstad T. Blake F. Blanc J. Blouw S. Blusk V. Bocci A. Bondar N. Bondar W. Bonivento S. Borghi A. Borgia T. J. V. Bowcock E. Bowen C. Bozzi T. Brambach J. van den Brand J. Bressieux D. Brett M. Britsch T. Britton N. H. Brook H. Brown I. Burducea A. Bursche G. Busetto J. Buytaert S. Cadeddu O. Callot M. Calvi M. Calvo Gomez A. Camboni P. Campana D. Campora Perez A. Carbone G. Carboni R. Cardinale A. Cardini H. Carranza-Mejia L. Carson K. Carvalho Akiba G. Casse L. Castillo Garcia M. Cattaneo Ch. Cauet M. Charles Ph. Charpentier P. Chen N. Chiapolini M. Chrzaszcz K. Ciba X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier C. Coca V. Coco J. Cogan E. Cogneras P. Collins A. Comerma-Montells A. Contu A. Cook M. Coombes S. Coquereau G. Corti B. Couturier G. A. Cowan D. C. Craik S. Cunliffe R. Currie C. D’Ambrosio P. David P. N. Y. David A. Davis I. De Bonis K. De Bruyn S. De Capua M. De Cian J. M. De Miranda L. De Paula W. De Silva P. De Simone D. Decamp M. Deckenhoff L. Del Buono N. Déléage D. Derkach O. Deschamps F. Dettori A. Di Canto F. Di Ruscio H. Dijkstra M. Dogaru S. Donleavy F. Dordei A. Dosil Suárez D. Dossett A. Dovbnya F. Dupertuis R. Dzhelyadin A. Dziurda A. Dzyuba S. Easo U. Egede V. Egorychev S. Eidelman D. van Eijk S. Eisenhardt U. Eitschberger R. Ekelhof L. Eklund I. El Rifai Ch. Elsasser D. Elsby A. Falabella C. Färber G. Nikhef National Institute for Subatomic Physics Amsterdam The Netherlands Universitat de Barcelona Barcelona Spain Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Oliver Lodge Laboratory University of Liverpool Liverpool United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France Fakultät Physik Technische Universität Dortmund Dortmund Germany European Organization for Nuclear Research (CERN) Geneva Switzerland School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Sezione INFN di Roma La Sapienza Roma Italy 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 Sezione INFN di Firenze Firenze Italy Physik-Institut Universität Zürich Zürich Switzerland University of Cincinnati Cincinnati Ohio USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Max-Planck-Institut für Kernphysik (MPIK) Heidelberg Germany Laboratori Nazionali dell’INFN di Frascati Frascati Italy Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York USA Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Department of Physics University of Warwick Coventry United Kingdom Institute of Theoretical and Experimental Physics (ITEP) Moscow Russia Sezione INFN di Ferrara Ferrara Italy Cavendish Laboratory University of Cambridge Cambridge United Kingdom Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Sezione INFN di Pisa Pisa Italy Centro Brasileiro de Pesquisas Físicas (CBPF) Rio de Janeiro Brazil LPNHE Université Pierre et Marie Curie Université Paris Diderot CNRS/IN2P3 Paris France

The first observation of the decay Bs0→D¯0K−π+ is reported. The analysis is based on a data sample, corresponding to an integrated luminosity of 1.0 fb−1 of pp collisions, collected with the LHCb detector. The branching fraction relative to that of the topologically similar decay B0→D¯0π+π− is measured to be B(Bs0→D¯0K−π+)B(B0→D¯0π+π−)=1.18±0.05(stat)±0.12(syst). In addition, the relative branching fraction of the decay B0→D¯0K+π− is measured to be B(B0→D¯0K+π−)B(B0→D¯0π+π−)=0.106±0.007(stat)±0.008(syst).

关键词： PROTON-proton interactions BRANCHING ratios (nuclear physics) PHYSICAL measurements LARGE Hadron Collider (France & Switzerland) nuclear counters RADIOACTIVE decay

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Measurement of Top Quark Polarization in Top-Antitop Events from Proton-Proton Collisions at s=7 TeV Using the ATLAS Detector

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Physical Review Letters 2013年第23期111卷 232002-232002页

作者： G. Aad T. Abajyan B. Abbott J. Abdallah S. Abdel Khalek O. Abdinov R. Aben B. Abi M. Abolins O. S. AbouZeid H. Abramowicz H. Abreu Y. Abulaiti B. S. Acharya L. Adamczyk D. L. Adams T. N. Addy J. Adelman S. Adomeit T. Adye S. Aefsky T. Agatonovic-Jovin J. A. Aguilar-Saavedra M. Agustoni S. P. Ahlen A. Ahmad M. Ahsan G. Aielli T. P. A. Åkesson G. Akimoto A. V. Akimov M. A. Alam J. Albert S. Albrand M. J. Alconada Verzini M. Aleksa I. N. Aleksandrov F. Alessandria C. Alexa G. Alexander G. Alexandre T. Alexopoulos M. Alhroob M. Aliev G. Alimonti L. Alio J. Alison B. M. M. Allbrooke L. J. Allison P. P. Allport S. E. Allwood-Spiers J. Almond A. Aloisio R. Alon A. Alonso F. Alonso A. Altheimer B. Alvarez Gonzalez M. G. Alviggi K. Amako Y. Amaral Coutinho C. Amelung V. V. Ammosov S. P. Amor Dos Santos A. Amorim S. Amoroso N. Amram C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders G. Anders K. J. Anderson A. Andreazza V. Andrei X. S. Anduaga S. Angelidakis P. Anger A. Angerami F. Anghinolfi A. V. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli M. Aoki L. Aperio Bella R. Apolle G. Arabidze I. Aracena Y. Arai A. T. H. Arce S. Arfaoui J-F. Arguin S. Argyropoulos E. Arik M. Arik A. J. Armbruster O. Arnaez V. Arnal O. Arslan A. Artamonov G. Artoni S. Asai N. Asbah S. Ask B. Åsman L. Asquith K. Assamagan R. Astalos A. Astbury M. Atkinson N. B. Atlay B. Auerbach E. Auge K. Augsten M. Aurousseau G. Avolio D. Axen G. Azuelos Y. Azuma M. A. Baak C. Bacci A. M. Bach H. Bachacou K. Bachas M. Backes M. Backhaus J. Backus Mayes E. Badescu P. Bagiacchi P. Bagnaia Y. Bai D. C. Bailey T. Bain J. T. Baines O. K. Baker S. Baker P. Balek F. Balli E. Banas Sw. Banerjee D. Banfi A. Bangert V. Bansal H. S. Bansil L. Barak S. P. Baranov T. Barber E. L. Barberio D. Barberis M. Barbero D. Y. Bardin T. Barillari M. Barisonzi T. Barklow N. Barlow B. M. Barnett R. M. Barnett A. Baroncelli G. Barone A. J. Barr F. Barreiro J. Barreiro Guimarães da Costa R. Bartoldus A. E. Barton V. Bartsch A. Bassalat A. Ba Fakultät für Mathematik und Physik Albert-Ludwigs-Universität Freiburg Germany Physikalisches Institut University of Bonn Bonn Germany Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institut de Física d’Altes Energies and Departament de Física de la Universitat Autònoma de Barcelona Barcelona Spain LAL Université Paris-Sud and CNRS/IN2P3 Orsay France Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam Netherlands Department of Physics Oklahoma State University Stillwater Oklahoma USA Department of Physics and Astronomy Michigan State University East Lansing Michigan USA Department of Physics University of Toronto Toronto Ontario Canada Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel DSM/IRFU (Institut de Recherches sur les Lois Fondamentales de l’Univers) CEA Saclay (Commissariat à l’Energie Atomique et aux Energies Alternatives) Gif-sur-Yvette France Department of Physics Stockholm University Sweden The Oskar Klein Centre Stockholm Sweden INFN Gruppo Collegato di Udine Italy ICTP Trieste Italy AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Physics Department Brookhaven National Laboratory Upton New York USA Department of Physics Hampton University Hampton Virginia USA Department of Physics Yale University New Haven Connecticut USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Department of Physics Brandeis University Waltham Massachusetts USA Vinca Institute of Nuclear Sciences University of Belgrade Belgrade Serbia Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain Albert Einstein Center for Fundamental Physics and Laboratory for High Energy

This Letter presents measurements of the polarization of the top quark in top-antitop quark pair events, using 4.7 fb−1 of proton-proton collision data recorded with the ATLAS detector at the Large Hadron Collider at s=7 TeV. Final states containing one or two isolated leptons (electrons or muons) and jets are considered. Two measurements of αℓP, the product of the leptonic spin-analyzing power and the top quark polarization, are performed assuming that the polarization is introduced by either a CP conserving or a maximally CP violating production process. The measurements obtained, αℓPCPC=−0.035±0.014(stat)±0.037(syst) and αℓPCPV=0.020±0.016(stat)−0.017+0.013(syst), are in good agreement with the standard model prediction of negligible top quark polarization.

关键词： POLARIZATION (nuclear physics) PROTON-proton interactions LARGE Hadron Collider (France & Switzerland) STANDARD model (nuclear physics) MONTE Carlo method

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Measurement of the Azimuthal Angle Dependence of Inclusive Jet Yields in Pb+Pb Collisions at sNN=2.76 TeV with the ATLAS Detector

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Physical Review Letters 2013年第15期111卷 152301-152301页

作者： G. Aad T. Abajyan B. Abbott J. Abdallah S. Abdel Khalek O. Abdinov R. Aben B. Abi M. Abolins O. S. AbouZeid H. Abramowicz H. Abreu Y. Abulaiti B. S. Acharya L. Adamczyk D. L. Adams T. N. Addy J. Adelman S. Adomeit T. Adye S. Aefsky T. Agatonovic-Jovin J. A. Aguilar-Saavedra M. Agustoni S. P. Ahlen A. Ahmad M. Ahsan G. Aielli T. P. A. Åkesson G. Akimoto A. V. Akimov M. A. Alam J. Albert S. Albrand M. J. Alconada Verzini M. Aleksa I. N. Aleksandrov F. Alessandria C. Alexa G. Alexander G. Alexandre T. Alexopoulos M. Alhroob M. Aliev G. Alimonti L. Alio J. Alison B. M. M. Allbrooke L. J. Allison P. P. Allport S. E. Allwood-Spiers J. Almond A. Aloisio R. Alon A. Alonso F. Alonso A. Altheimer B. Alvarez Gonzalez M. G. Alviggi K. Amako Y. Amaral Coutinho C. Amelung V. V. Ammosov S. P. Amor Dos Santos A. Amorim S. Amoroso N. Amram C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders G. Anders K. J. Anderson A. Andreazza V. Andrei X. S. Anduaga S. Angelidakis P. Anger A. Angerami F. Anghinolfi A. V. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli M. Aoki L. Aperio Bella R. Apolle G. Arabidze I. Aracena Y. Arai A. T. H. Arce S. Arfaoui J-F. Arguin S. Argyropoulos E. Arik M. Arik A. J. Armbruster O. Arnaez V. Arnal A. Artamonov G. Artoni D. Arutinov S. Asai N. Asbah S. Ask B. Åsman L. Asquith K. Assamagan R. Astalos A. Astbury M. Atkinson N. B. Atlay B. Auerbach E. Auge K. Augsten M. Aurousseau G. Avolio D. Axen G. Azuelos Y. Azuma M. A. Baak C. Bacci A. M. Bach H. Bachacou K. Bachas M. Backes M. Backhaus J. Backus Mayes E. Badescu P. Bagiacchi P. Bagnaia Y. Bai D. C. Bailey T. Bain J. T. Baines O. K. Baker S. Baker P. Balek F. Balli E. Banas Sw. Banerjee D. Banfi A. Bangert V. Bansal H. S. Bansil L. Barak S. P. Baranov T. Barber E. L. Barberio D. Barberis M. Barbero D. Y. Bardin T. Barillari M. Barisonzi T. Barklow N. Barlow B. M. Barnett R. M. Barnett A. Baroncelli G. Barone A. J. Barr F. Barreiro J. Barreiro Guimarães da Costa R. Bartoldus A. E. Barton V. Bartsch A. Basye R. L. Fakultät für Mathematik und Physik Albert-Ludwigs-Universität Freiburg Germany Physikalisches Institut University of Bonn Bonn Germany Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institut de Física d’Altes Energies and Departament de Física de la Universitat Autònoma de Barcelona Barcelona Spain LAL Université Paris-Sud and CNRS/IN2P3 Orsay France Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam Netherlands Department of Physics Oklahoma State University Stillwater Oklahoma USA Department of Physics and Astronomy Michigan State University East Lansing Michigan USA Department of Physics University of Toronto Toronto Ontario Canada Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel DSM/IRFU (Institut de Recherches sur les Lois Fondamentales de l’Univers) CEA Saclay (Commissariat à l’Energie Atomique et aux Energies Alternatives) Gif-sur-Yvette France Department of Physics Stockholm University Stockholm Sweden The Oskar Klein Centre Stockholm Sweden INFN Gruppo Collegato di Udine Udine Italy ICTP Trieste Italy AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Physics Department Brookhaven National Laboratory Upton New York USA Department of Physics Hampton University Hampton Virginia USA Department of Physics Yale University New Haven Connecticut USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Department of Physics Brandeis University Waltham Massachusetts USA Vinca Institute of Nuclear Sciences University of Belgrade Belgrade Serbia Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain Albert Einstein Center for Fundamental Physics and Laborato

Measurements of the variation of inclusive jet suppression as a function of relative azimuthal angle, Δϕ, with respect to the elliptic event plane provide insight into the path-length dependence of jet quenching. ATLAS has measured the Δϕ dependence of jet yields in 0.14 nb−1 of sNN=2.76 TeV Pb+Pb collisions at the LHC for jet transverse momenta pT>45 GeV in different collision centrality bins using an underlying event subtraction procedure that accounts for elliptic flow. The variation of the jet yield with Δϕ was characterized by the parameter, v2jet, and the ratio of out-of-plane (Δϕ∼π/2) to in-plane (Δϕ∼0) yields. Nonzero v2jet values were measured in all centrality bins for pT<160 GeV. The jet yields are observed to vary by as much as 20% between in-plane and out-of-plane directions.

关键词： AZIMUTHAL projection (Cartography) LEAD COLLISIONS (nuclear physics) METALS -- Quenching LARGE Hadron Collider (France & Switzerland)

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Measurement of the polarization amplitudes in B0→J/ψK*(892)0 decays

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Physical Review D 2013年第5期88卷 052002-052002页

作者： R. Aaij C. Abellan Beteta B. Adeva M. Adinolfi C. Adrover A. Affolder Z. Ajaltouni J. Albrecht F. Alessio M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr. S. Amato S. Amerio Y. Amhis L. Anderlini J. Anderson R. Andreassen R. B. Appleby O. Aquines Gutierrez F. Archilli A. Artamonov M. Artuso E. Aslanides G. Auriemma S. Bachmann J. J. Back C. Baesso V. Balagura W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter Th. Bauer A. Bay J. Beddow F. Bedeschi I. Bediaga S. Belogurov K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson J. Benton A. Berezhnoy R. Bernet M.-O. Bettler M. van Beuzekom A. Bien S. Bifani T. Bird A. Bizzeti P. M. Bjørnstad T. Blake F. Blanc J. Blouw S. Blusk V. Bocci A. Bondar N. Bondar W. Bonivento S. Borghi A. Borgia T. J. V. Bowcock E. Bowen C. Bozzi T. Brambach J. van den Brand J. Bressieux D. Brett M. Britsch T. Britton N. H. Brook H. Brown I. Burducea A. Bursche G. Busetto J. Buytaert S. Cadeddu O. Callot M. Calvi M. Calvo Gomez A. Camboni P. Campana D. Campora Perez A. Carbone G. Carboni R. Cardinale A. Cardini H. Carranza-Mejia L. Carson K. Carvalho Akiba G. Casse L. Castillo Garcia M. Cattaneo Ch. Cauet M. Charles Ph. Charpentier P. Chen N. Chiapolini M. Chrzaszcz K. Ciba X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier C. Coca V. Coco J. Cogan E. Cogneras P. Collins A. Comerma-Montells A. Contu A. Cook M. Coombes S. Coquereau G. Corti B. Couturier G. A. Cowan D. C. Craik S. Cunliffe R. Currie C. D’Ambrosio P. David P. N. Y. David A. Davis I. De Bonis K. De Bruyn S. De Capua M. De Cian J. M. De Miranda L. De Paula W. De Silva P. De Simone D. Decamp M. Deckenhoff L. Del Buono N. Déléage D. Derkach O. Deschamps F. Dettori A. Di Canto H. Dijkstra M. Dogaru S. Donleavy F. Dordei A. Dosil Suárez D. Dossett A. Dovbnya F. Dupertuis R. Dzhelyadin A. Dziurda A. Dzyuba S. Easo U. Egede V. Egorychev S. Eidelman D. van Eijk S. Eisenhardt U. Eitschberger R. Ekelhof L. Eklund I. El Rifai Ch. Elsasser D. Elsby A. Falabella C. Färber G. Fardell C. Fa Nikhef National Institute for Subatomic Physics Amsterdam The Netherlands Universitat de Barcelona Barcelona Spain Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Oliver Lodge Laboratory University of Liverpool Liverpool United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France Fakultät Physik Technische Universität Dortmund Dortmund Germany European Organization for Nuclear Research (CERN) Geneva Switzerland School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Sezione INFN di Roma La Sapienza Roma Italy 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 Sezione INFN di Firenze Firenze Italy Physik-Institut Universität Zürich Zürich Switzerland University of Cincinnati Cincinnati Ohio USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Max-Planck-Institut für Kernphysik (MPIK) Heidelberg Germany Laboratori Nazionali dell’INFN di Frascati Frascati Italy Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York USA Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Department of Physics University of Warwick Coventry United Kingdom Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Rio de Janeiro Brazil and Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Institute of Theoretical and Experimental Physics (ITEP) Moscow Russia Sezione INFN di Ferrara Ferrara Italy Cavendish Laboratory University of Cambridge Cambridge United Kingdom Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Sezione INFN di Pisa Pisa Italy Cent

An analysis of the decay B0→J/ψK*(892)0 is presented using data, corresponding to an integrated luminosity of 1.0 fb−1, collected in pp collisions at a center-of-mass energy of 7 TeV with the LHCb detector. The polarization amplitudes and the corresponding phases are measured to be |A∥|2=0.227±0.004 (stat)±0.011 (syst), |A⊥|2=0.201±0.004 (stat)±0.008 (syst), δ∥[rad]=−2.94±0.02 (stat)±0.03 (syst), and δ⊥[rad]=2.94±0.02 (stat)±0.02 (syst). Comparing B0→J/ψK*(892)0 and B¯0→J/ψK¯*(892)0 decays, no evidence for direct CP violation is found.

关键词： STANDARD model (nuclear physics) CHERENKOV counters MUONS -- Decay EXPONENTIAL functions PROBABILITY density function

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Study of Residual Stress and Vacancy Defects in Oxide Dispersion Strengthened Steels

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physics Procedia 2012年 35卷 98-103页

作者： V. Slugeň J. Veterníková S. Kilpeläinen F. Tuomisto Institute of Nuclear and Physical Engineering Faculty of Electrical Engineering and Information Technology Slovak University of Technology Ilkovičova 3 812 19 Bratislava Slovakia Department of Applied Physics Aalto University School of Science and Technology P.O.Box 11100 FI-00076 Aalto Finland

This study was focused on commercial oxide-dispersion strengthened (ODS) steels -MA 956 (20%Cr), ODM 751 (16%Cr) and ODS Eurofer (9%Cr), developed for fuel cladding of GEN IV reactors. The ODS steels are described in order to comparison their microstructure features. Vacancy defects were observed by Doppler Broadening Spectroscopy (DBS) and Positron Annihilation Lifetime Spectroscopy (PALS). Residual stress proportional to all kinds of defects was investigated by Magnetic Barkhausen Noise (MBN) measurement. The positron techniques demonstrated the highest defect concentration for ODS Eurofer followed by MA 956. The lowest defect density belongs to ODM 751; although these defects are the largest (three or four vacancy clusters). MA 956 and ODS Eurofer have di-vacancies in predominance. MBN results are in a good accordance with positron techniques. The highest residual stress is for ODS Eurofer, followed by MA 956. Finally, the lowest residual stress proportional to hardness is found for ODM 751.

关键词： ODS steels Positron Annihilation Lifetime Spectroscopy Doppler Broadening Spectroscopy Magnetic Barkhausen Noise

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First observation of B¯0→J/ψK+K− and search for B¯0→J/ψϕ decays

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Physical Review D 2013年第7期88卷 072005-072005页

作者： R. Aaij B. Adeva M. Adinolfi C. Adrover A. Affolder Z. Ajaltouni J. Albrecht F. Alessio M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr. S. Amato S. Amerio Y. Amhis L. Anderlini J. Anderson R. Andreassen J. E. Andrews R. B. Appleby O. Aquines Gutierrez F. Archilli A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch S. Bachmann J. J. Back C. Baesso V. Balagura W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter Th. Bauer A. Bay J. Beddow F. Bedeschi I. Bediaga S. Belogurov K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson J. Benton A. Berezhnoy R. Bernet M.-O. Bettler M. van Beuzekom A. Bien S. Bifani T. Bird A. Bizzeti P. M. Bjørnstad T. Blake F. Blanc J. Blouw S. Blusk V. Bocci A. Bondar N. Bondar W. Bonivento S. Borghi A. Borgia T. J. V. Bowcock E. Bowen C. Bozzi T. Brambach J. van den Brand J. Bressieux D. Brett M. Britsch T. Britton N. H. Brook H. Brown A. Bursche G. Busetto J. Buytaert S. Cadeddu O. Callot M. Calvi M. Calvo Gomez A. Camboni P. Campana D. Campora Perez A. Carbone G. Carboni R. Cardinale A. Cardini H. Carranza-Mejia L. Carson K. Carvalho Akiba G. Casse L. Cassina L. Castillo Garcia M. Cattaneo Ch. Cauet R. Cenci M. Charles Ph. Charpentier P. Chen S.-F. Cheung N. Chiapolini M. Chrzaszcz K. Ciba X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier C. Coca V. Coco J. Cogan E. Cogneras P. Collins A. Comerma-Montells A. Contu A. Cook M. Coombes S. Coquereau G. Corti B. Couturier G. A. Cowan D. C. Craik S. Cunliffe R. Currie C. D’Ambrosio P. David P. N. Y. David A. Davis I. De Bonis K. De Bruyn S. De Capua M. De Cian J. M. De Miranda L. De Paula W. De Silva P. De Simone D. Decamp M. Deckenhoff L. Del Buono N. Déléage D. Derkach O. Deschamps F. Dettori A. Di Canto H. Dijkstra M. Dogaru S. Donleavy F. Dordei A. Dosil Suárez D. Dossett A. Dovbnya F. Dupertuis P. Durante R. Dzhelyadin A. Dziurda A. Dzyuba S. Easo U. Egede V. Egorychev S. Eidelman D. van Eijk S. Eisenhardt U. Eitschberger R. Ekelhof L. Eklund I. El Rifai Ch. Elsasser A. Falab Nikhef National Institute for Subatomic Physics Amsterdam The Netherlands Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Oliver Lodge Laboratory University of Liverpool Liverpool United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France Fakultät Physik Technische Universität Dortmund Dortmund Germany European Organization for Nuclear Research (CERN) Geneva Switzerland School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Sezione INFN di Roma La Sapienza Roma Italy 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 Sezione INFN di Firenze Firenze Italy Physik-Institut Universität Zürich Zürich Switzerland University of Cincinnati Cincinnati Ohio United States 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 Laboratori Nazionali dell’INFN di Frascati Frascati Italy Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York United States Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Department of Physics University of Warwick Coventry United Kingdom Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Rio de Janeiro Brazil (associated with Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil) Institute of Theoretical and Experimental Physics (ITEP) Moscow Russia Sezione INFN di Ferrara Ferrara Italy Cavendish Laboratory University of Cambridge Cambridge United Kingdom Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausann

The first observation of the B¯0→J/ψK+K− decay is presented with a data sample corresponding to an integrated luminosity of 1.0 fb−1 of pp collisions at a center-of-mass energy of 7 TeV collected with the LHCb detector. The branching fraction is measured to be B(B¯0→J/ψK+K−)=(2.53±0.31±0.19)×10−6, where the first uncertainty is statistical and the second is systematic. An amplitude analysis of the final state in the B¯0→J/ψK+K− decay is performed to separate resonant and nonresonant contributions in the K+K− spectrum. Evidence of the a0(980) resonance is reported with statistical significance of 3.9 standard deviations. The corresponding product branching fraction is measured to be B(B¯0→J/ψa0(980),a0(980)→K+K−)=(4.70±3.31±0.72)×10−7, yielding an upper limit of B(B¯0→J/ψa0(980),a0(980)→K+K−)<9.0×10−7 at 90% confidence level. No evidence of the resonant decay B¯0→J/ψϕ is found, and an upper limit on its branching fraction is set to be B(B¯0→J/ψϕ)<1.9×10−7 at 90% confidence level.

关键词： BRANCHING ratios (nuclear physics) RADIOACTIVE decay CENTER of mass LUMINOSITY LARGE Hadron Collider (France & Switzerland) STANDARD deviations SPECTRUM analysis

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Studies of the decays B+→pp¯h+ and observation of B+→Λ¯(1520)p

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Physical Review D 2013年第5期88卷 052015-052015页

作者： R. Aaij B. Adeva M. Adinolfi C. Adrover A. Affolder Z. Ajaltouni J. Albrecht F. Alessio M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr. S. Amato S. Amerio Y. Amhis L. Anderlini J. Anderson R. Andreassen J. E. Andrews R. B. Appleby O. Aquines Gutierrez F. Archilli A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch S. Bachmann J. J. Back C. Baesso V. Balagura W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter Th. Bauer A. Bay J. Beddow F. Bedeschi I. Bediaga S. Belogurov K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson J. Benton A. Berezhnoy R. Bernet M.-O. Bettler M. van Beuzekom A. Bien S. Bifani T. Bird A. Bizzeti P. M. Bjørnstad T. Blake F. Blanc J. Blouw S. Blusk V. Bocci A. Bondar N. Bondar W. Bonivento S. Borghi A. Borgia T. J. V. Bowcock E. Bowen C. Bozzi T. Brambach J. van den Brand J. Bressieux D. Brett M. Britsch T. Britton N. H. Brook H. Brown I. Burducea A. Bursche G. Busetto J. Buytaert S. Cadeddu O. Callot M. Calvi M. Calvo Gomez A. Camboni P. Campana D. Campora Perez A. Carbone G. Carboni R. Cardinale A. Cardini H. Carranza-Mejia L. Carson K. Carvalho Akiba G. Casse L. Castillo Garcia M. Cattaneo Ch. Cauet R. Cenci M. Charles Ph. Charpentier P. Chen N. Chiapolini M. Chrzaszcz K. Ciba X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier C. Coca V. Coco J. Cogan E. Cogneras P. Collins A. Comerma-Montells A. Contu A. Cook M. Coombes S. Coquereau G. Corti B. Couturier G. A. Cowan D. C. Craik S. Cunliffe R. Currie C. D’Ambrosio P. David P. N. Y. David A. Davis I. De Bonis K. De Bruyn S. De Capua M. De Cian J. M. De Miranda L. De Paula W. De Silva P. De Simone D. Decamp M. Deckenhoff L. Del Buono N. Déléage D. Derkach O. Deschamps F. Dettori A. Di Canto H. Dijkstra M. Dogaru S. Donleavy F. Dordei A. Dosil Suárez D. Dossett A. Dovbnya F. Dupertuis P. Durante R. Dzhelyadin A. Dziurda A. Dzyuba S. Easo U. Egede V. Egorychev S. Eidelman D. van Eijk S. Eisenhardt U. Eitschberger R. Ekelhof L. Eklund I. El Rifai Ch. Elsasser A. Falabella C. Färb Nikhef National Institute for Subatomic Physics Amsterdam The Netherlands Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Oliver Lodge Laboratory University of Liverpool Liverpool United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France Fakultät Physik Technische Universität Dortmund Dortmund Germany European Organization for Nuclear Research (CERN) Geneva Switzerland School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Sezione INFN di Roma La Sapienza Roma Italy 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 Sezione INFN di Firenze Firenze Italy Physik-Institut Universität Zürich Zürich Switzerland University of Cincinnati Cincinnati Ohio USA 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 Laboratori Nazionali dell’INFN di Frascati Frascati Italy Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York USA Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Department of Physics University of Warwick Coventry United Kingdom Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Rio de Janeiro Brazil associated to Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Institute of Theoretical and Experimental Physics (ITEP) Moscow Russia Sezione INFN di Ferrara Ferrara Italy Cavendish Laboratory University of Cambridge Cambridge United Kingdom Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Sezione INFN di Pis

Dynamics and direct CP violation in three-body charmless decays of charged B mesons to a proton, an antiproton and a light meson (pion or kaon) are studied using data, corresponding to an integrated luminosity of 1.0 fb−1, collected by the LHCb experiment in pp collisions at a center-of-mass energy of 7 TeV. Production spectra are determined as a function of Dalitz-plot and helicity variables. The forward-backward asymmetry of the light meson in the pp¯ rest frame is measured. No significant CP asymmetry in B+→pp¯K+ decay is found in any region of the Dalitz plane. We present the first observation of the decay B+→Λ¯(1520)(→K+p¯)p near the K+p¯ threshold and measure B(B+→Λ¯(1520)p)=(3.9−0.9+1.0(stat)±0.1(syst)±0.3(BF))×10−7, where BF denotes the uncertainty on secondary branching fractions.

关键词： MESONS PROTON decay SPECIAL relativity (physics) VERTEX detectors DIPOLE moments MOMENTUM distributions DECAY

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Study of decays with first observation of and

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Journal of High Energy physics 2013年第10期2013卷 1-22页

作者： Aaij, R. Adeva, B. Adinolfi, M. Adrover, C. Affolder, A. Ajaltouni, Z. Albrecht, J. Alessio, F. Alexander, M. Ali, S. Alkhazov, G. Alvarez Cartelle, P. Alves, A. A. Amato, S. Amerio, S. Amhis, Y. Anderlini, L. Anderson, J. Andreassen, R. Andrews, J. E. Appleby, R. B. Aquines Gutierrez, O. Archilli, F. Artamonov, A. Artuso, M. Aslanides, E. Auriemma, G. Baalouch, M. Bachmann, S. Back, J. J. Baesso, C. Balagura, V. Baldini, W. Barlow, R. J. Barschel, C. Barsuk, S. Barter, W. Bauer, Th. Bay, A. Beddow, J. Bedeschi, F. Bediaga, I. Belogurov, S. Belous, K. Belyaev, I. Ben-Haim, E. Bencivenni, G. Benson, S. Benton, J. Berezhnoy, A. Bernet, R. Bettler, M.-O. van Beuzekom, M. Bien, A. Bifani, S. Bird, T. Bizzeti, A. Bjørnstad, P. M. Blake, T. Blanc, F. Blouw, J. Blusk, S. Bocci, V. Bondar, A. Bondar, N. Bonivento, W. Borghi, S. Borgia, A. Bowcock, T. J. V. Bowen, E. Bozzi, C. Brambach, T. van den Brand, J. Bressieux, J. Brett, D. Britsch, M. Britton, T. Brook, N. H. Brown, H. Burducea, I. Bursche, A. Busetto, G. Buytaert, J. Cadeddu, S. Callot, O. Calvi, M. Calvo Gomez, M. Camboni, A. Campana, P. Campora Perez, D. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carranza-Mejia, H. Carson, L. Carvalho Akiba, K. Casse, G. Castillo Garcia, L. Cattaneo, M. Cauet, Ch. Cenci, R. Charles, M. Charpentier, Ph. Chen, P. Chiapolini, N. Chrzaszcz, M. Ciba, K. Cid Vidal, X. Ciezarek, G. Clarke, P. E. L. Clemencic, M. Cliff, H. V. Closier, J. Coca, C. Coco, V. Cogan, J. Cogneras, E. Collins, P. Comerma-Montells, A. Contu, A. Cook, A. Coombes, M. Coquereau, S. Corti, G. Couturier, B. Cowan, G. A. Cowie, E. Craik, D. C. Cunliffe, S. Currie, R. D’Ambrosio, C. David, P. David, P. N. Y. Davis, A. De Bonis, I. De Bruyn, K. De Capua, S. De Cian, M. De Miranda, J. M. De Paula, L. De Silva, W. De Simone, P. Decamp, D. Deckenhoff, M. Del Buono, L. Déléage, N. Derkach, D. Deschamps, O. Dettori, F. Di Canto, A. Dijkstra, H. Dogaru, M. Donleavy, S. Dordei, F. Dosil Suárez, A. Dossett, D. Dovbnya, A. Dupertuis, F. Durante, P. Dzhelyadin, R. Dziurd Nikhef National Institute for Subatomic Physics Amsterdam The Netherlands Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol U.K. CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Oliver Lodge Laboratory University of Liverpool Liverpool U.K. Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France Fakultät Physik Technische Universität Dortmund Dortmund Germany European Organization for Nuclear Research (CERN) Geneva Switzerland School of Physics and Astronomy University of Glasgow Glasgow U.K. Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Sezione INFN di Roma La Sapienza Roma Italy 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 Sezione INFN di Firenze Firenze Italy Università di Firenze Firenze Italy Physik-Institut Universität Zürich Zürich Switzerland University of Cincinnati Cincinnati U.S.A. University of Maryland College Park U.S.A. School of Physics and Astronomy University of Manchester Manchester U.K. Max-Planck-Institut für Kernphysik (MPIK) Heidelberg Germany Laboratori Nazionali dell’INFN di Frascati Frascati Italy Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse U.S.A. Università della Basilicata Potenza Italy Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Department of Physics University of Warwick Coventry U.K. Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Rio de Janeiro Brazil associated to 2 Institute of Theoretical and Experimental Physics (ITEP) Moscow Russia Sezione INFN di Ferrara Ferrara Italy Cavendish Laboratory University of Cambridge Cambridge U.K. Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Sezione INFN di Pisa Pisa Italy Centro Brasileiro de Pesquisas Físicas (CBPF)

A search for charmless three-body decays of B 0 and $ B_s^0 $ mesons with a $ K_{\mathrm{S}}^0 $ meson in the final state is performed using the pp collision data, corresponding to an integrated luminosity of 1.0 fb−1, collected at a centre-of-mass energy of 7 TeV recorded by the LHCb experiment. Branching fractions of the $ B_{(s)}^0\to K_{\mathrm{S}}^0{h^{+}}{h^{{\prime -}}} $ decay modes (h (′) = π, K), relative to the well measured $ {B^0}\to K_{\mathrm{S}}^0{\pi^{+}}{\pi^{-}} $ decay, are obtained. First observation of the decay modes $ B_s^0\to K_{\mathrm{S}}^0{K^{\pm }}{\pi^{\mp }} $ and $ B_s^0\to K_{\mathrm{S}}^0{\pi^{+}}{\pi^{-}} $ and confirmation of the decay $ {B^0}\to K_{\mathrm{S}}^0{K^{\pm }}{\pi^{\mp }} $ are reported. The following relative branching fraction measurements or limits are obtained $ \begin{array}{*{20}{c}} {\frac{{\mathcal{B}\left( {{B^0}\to K_{\mathrm{S}}^0{K^{\pm }}{\pi^{\mp }}} \right)}}{{\mathcal{B}\left( {{B^0}\to K_{\mathrm{S}}^0{\pi^{+}}{\pi^{-}}} \right)}}=0.128\pm 0.017\left( {\mathrm{stat}.} \right)\pm 0.009\left( {\mathrm{syst}.} \right),} \hfill \\ {\frac{{\mathcal{B}\left( {{B^0}\to K_{\mathrm{S}}^0{K^{+}}{K^{-}}} \right)}}{{\mathcal{B}\left( {{B^0}\to K_{\mathrm{S}}^0{\pi^{+}}{\pi^{-}}} \right)}}=0.385\pm 0.031\left( {\mathrm{stat}.} \right)\pm 0.023\left( {\mathrm{syst}.} \right),} \hfill \\ {\frac{{\mathcal{B}\left( {B_s^0\to K_{\mathrm{S}}^0{\pi^{+}}{\pi^{-}}} \right)}}{{\mathcal{B}\left( {{B^0}\to K_{\mathrm{S}}^0{\pi^{+}}{\pi^{-}}} \right)}}=0.29\pm 0.06\left( {\mathrm{stat}.} \right)\pm 0.03\left( {\mathrm{syst}.} \right)\pm 0.02\left( {{{{{f_s}}} \left/ {{{f_d}}} \right.}} \right),} \hfill \\ {\frac{{\mathcal{B}\left( {B_s^0\to K_{\mathrm{S}}^0{K^{\pm }}{\pi^{\mp }}} \right)}}{{\mathcal{B}\left( {{B^0}\to K_{\mathrm{S}}^0{\pi^{+}}{\pi^{-}}} \right)}}=1.48\pm 0.12\left( {\mathrm{stat}.} \right)\pm 0.08\left( {\mathrm{syst}.} \right)\pm 0.12\left( {{{{{f_s}}} \left/ {{{f_d}}} \right.}} \right)} \hfill \\ {\frac{{\ma

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