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Measurements of spin correlation in top-antitop quark events from proton-proton collisions at s=7 TeV using the ATLAS detector

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Physical Review D 2014年第11期90卷 112016-112016页

作者： G. Aad b. Abbott J. Abdallah S. Ab.el Khalek O. Abdinov R. Aben b. Abi M. Abolins O. S. AbouZeid H. Abramowicz H. Ab.eu R. Ab.eu Y. Abulaiti b. S. Acharya L. Adamczyk D. L. Adams J. Adelman S. Adomeit T. Adye T. Agatonovic-Jovin J. A. Aguilar-Saavedra M. Agustoni S. P. Ahlen F. Ahmadov G. Aielli H. Akerstedt T. P. A. Åkesson G. Akimoto A. V. Akimov G. L. Alberghi J. Albert S. Albrand M. J. Alconada Verzini M. Aleksa I. N. Aleksandrov C. Alexa G. Alexander G. Alexandre T. Alexopoulos M. Alhroob G. Alimonti L. Alio J. Alison b. M. M. Allbrooke L. J. Allison P. P. Allport J. Almond A. Aloisio A. Alonso F. Alonso C. Alpigiani A. Altheimer b. Alvarez Gonzalez M. G. Alviggi K. Amako Y. Amaral Coutinho C. Amelung D. Amidei S. P. Amor Dos Santos A. Amorim S. Amoroso N. Amram G. Amundsen 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 I. Angelozzi 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 J. P. Araque A. T. H. Arce J-F. Arguin S. Argyropoulos M. Arik A. J. Armbruster O. Arnaez V. Arnal H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Asai N. Asbah A. Ashkenazi b. Åsman L. Asquith K. Assamagan R. Astalos M. Atkinson N. b. Atlay b. Auerbach K. Augsten M. Aurousseau G. Avolio G. Azuelos Y. Azuma M. A. baak A. baas C. bacci H. bachacou K. bachas M. backes M. backhaus J. backus Mayes e. badescu P. bagiacchi P. bagnaia Y. bai T. bain J. T. baines O. K. baker P. balek F. balli e. banas Sw. banerjee A. A. e. bannoura V. bansal H. S. bansil L. barak S. P. baranov e. L. barberio D. barberis M. barbero T. barillari M. barisonzi T. barklow N. barlow b. M. barnett R. M. barnett Z. barnovska A. baroncelli G. barone A. J. barr F. barreiro J. barreiro Guimarães da Costa R. bartoldus A. e. barton P. bartos V. bartsch A. bassalat A. basye R. L. bates L. batkova J. R. batley M. battaglia M. battistin CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Academia Sinica Taipei Taiwan 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 ON Canada Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion: Israel Institute of Technology Haifa Israel CERN Geneva Switzerland Department of Physics Stockholm University Sweden The Oskar Klein Centre Stockholm Sweden INFN Gruppo Collegato di Udine Sezione di Trieste 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 Yale University New Haven Connecticut USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Institute of Physics University of Belgrade Belgrade Serbia Laboratorio de Instrumentacao e Fisica Experimental de Particulas - LIP Lisboa Portugal Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada (Spain) Portugal Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics University of Bern Bern Switzerland Department of Physics Boston University Boston Massachusetts USA Joint Institute for Nuclear Research JINR Dubna Dubna Russia INFN Sezione di Roma Tor Vergata Italy Dipartimento di Fisic

Measurements of spin correlation in top quark pair production are presented using data collected with the ATLAS detector at the LHC with proton-proton collisions at a center-of-mass energy of 7 TeV, corresponding to an integrated luminosity of 4.6 fb−1. events are selected in final states with two charged leptons and at least two jets and in final states with one charged lepton and at least four jets. Four different ob.ervab.es sensitive to different properties of the top quark pair production mechanism are used to extract the correlation between the top and antitop quark spins. Some of these ob.ervab.es are measured for the first time. The measurements are in good agreement with the Standard Model prediction at next-to-leading-order accuracy.

关键词： Atlas pair production Collisions jet atlas Spin jets Jets Quarks terminal states Leptons detector

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Flavor tagged time-dependent angular analysis of the bs0→J/ψϕ decay and extraction of ΔΓs and the weak phase ϕs in ATLAS

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Physical Review D 2014年第5期90卷 052007-052007页

作者： G. Aad T. Abajyan b. Abbott J. Abdallah S. Ab.el Khalek O. Abdinov R. Aben b. Abi M. Abolins O. S. AbouZeid H. Abramowicz H. Ab.eu Y. Abulaiti b. S. Acharya L. Adamczyk D. L. Adams T. N. Addy J. Adelman S. Adomeit T. Adye T. Agatonovic-Jovin J. A. Aguilar-Saavedra M. Agustoni S. P. Ahlen A. Ahmad F. Ahmadov G. Aielli T. P. A. Åkesson G. Akimoto A. V. Akimov J. Albert S. Albrand M. J. Alconada Verzini M. Aleksa I. N. Aleksandrov C. Alexa G. Alexander G. Alexandre T. Alexopoulos M. Alhroob 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 C. Alpigiani A. Altheimer b. Alvarez Gonzalez M. G. Alviggi K. Amako Y. Amaral Coutinho C. Amelung D. Amidei V. V. Ammosov S. P. Amor Dos Santos A. Amorim S. Amoroso N. Amram G. Amundsen 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 J. P. Araque A. T. H. Arce J-F. Arguin S. Argyropoulos M. Arik A. J. Armbruster O. Arnaez V. Arnal O. Arslan A. Artamonov G. Artoni S. Asai N. Asbah A. Ashkenazi S. Ask b. Åsman L. Asquith K. Assamagan R. Astalos M. Atkinson N. b. Atlay b. Auerbach e. Auge K. Augsten M. Aurousseau G. Avolio 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 A. A. e. bannoura V. bansal H. S. bansil L. barak S. P. baranov T. barber e. L. barberio D. barberis M. barbero T. barillari M. barisonzi T. barklow N. barlow b. M. barnett R. M. barnett Z. barnovska A. baroncelli G. barone A. J. barr F. barreiro J. barreiro Guimarães da Costa R. bartoldus A. e. barton P. bartos V. bartsch A. bassal CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Physikalisches Institut University of Bonn Bonn Germany Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Academia Sinica Taipei Taiwan 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 ON 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 Sezione di Trieste 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 Vinca Institute of Nuclear Sciences University of Belgrade Belgrade Serbia Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada (Spain) Portugal Laboratorio de Instrumentacao e Fisica Experimental de Particulas - LIP Lisboa Portugal Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics University o

A measurement of the bs0→J/ψϕ decay parameters, updated to include flavor tagging is reported using 4.9 fb−1 of integrated luminosity collected by the ATLAS detector from s=7 TeV pp collisions recorded in 2011 at the LHC. The values measured for the physical parameters are ϕs=0.12±0.25(stat)±0.05(syst) radΔΓs=0.053±0.021(stat)±0.010(syst) ps−1Γs=0.677±0.007(stat)±0.004(syst) ps−1|A∥(0)|2=0.220±0.008(stat)±0.009(syst)|A0(0)|2=0.529±0.006(stat)±0.012(syst)δ⊥=3.89±0.47(stat)±0.11(syst) radwhere the parameter ΔΓs is constrained to be positive. The S-wave contribution was measured and found to be compatib.e with zero. Results for ϕs and ΔΓs are also presented as 68% and 95% likelihood contours, which show agreement with the Standard Model expectations.

关键词： RADIOACTIVe decay FLAVOR in particle physics WeAK interactions (Nuclear physics) LUMINOSITY NUCLeAR counters calibration

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Measurement of long-range pseudorapidity correlations and azimuthal harmonics in sNN=5.02 TeV proton-lead collisions with the ATLAS detector

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Physical Review C 2014年第4期90卷 044906-044906页

作者： G. Aad b. Abbott J. Abdallah S. Ab.el Khalek O. Abdinov R. Aben b. Abi M. Abolins O. S. AbouZeid H. Abramowicz H. Ab.eu R. Ab.eu Y. Abulaiti b. S. Acharya L. Adamczyk D. L. Adams J. Adelman S. Adomeit T. Adye T. Agatonovic-Jovin J. A. Aguilar-Saavedra M. Agustoni S. P. Ahlen F. Ahmadov G. Aielli H. Akerstedt T. P. A. Åkesson G. Akimoto A. V. Akimov G. L. Alberghi J. Albert S. Albrand M. J. Alconada Verzini M. Aleksa I. N. Aleksandrov C. Alexa G. Alexander G. Alexandre T. Alexopoulos M. Alhroob G. Alimonti L. Alio J. Alison b. M. M. Allbrooke L. J. Allison P. P. Allport J. Almond A. Aloisio A. Alonso F. Alonso C. Alpigiani A. Altheimer b. Alvarez Gonzalez M. G. Alviggi K. Amako Y. Amaral Coutinho C. Amelung D. Amidei S. P. Amor Dos Santos A. Amorim S. Amoroso N. Amram G. Amundsen 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 I. Angelozzi 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 J. P. Araque A. T. H. Arce J-F. Arguin S. Argyropoulos M. Arik A. J. Armbruster O. Arnaez V. Arnal H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Asai N. Asbah A. Ashkenazi b. Åsman L. Asquith K. Assamagan R. Astalos M. Atkinson N. b. Atlay b. Auerbach K. Augsten M. Aurousseau G. Avolio G. Azuelos Y. Azuma M. A. baak A. e. baas C. bacci H. bachacou K. bachas M. backes M. backhaus J. backus Mayes e. badescu P. bagiacchi P. bagnaia Y. bai T. bain J. T. baines O. K. baker P. balek F. balli e. banas Sw. banerjee A. A. e. bannoura V. bansal H. S. bansil L. barak S. P. baranov e. L. barberio D. barberis M. barbero T. barillari M. barisonzi T. barklow N. barlow b. M. barnett R. M. barnett Z. barnovska A. baroncelli G. barone A. J. barr F. barreiro J. barreiro Guimarães da Costa R. bartoldus A. e. barton P. bartos V. bartsch A. bassalat A. basye R. L. bates J. R. batley M. battaglia M. battistin F. baue CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Academia Sinica Taipei Taiwan 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 Department of Physics Technion: Israel Institute of Technology Haifa Israel CERN Geneva Switzerland Department of Physics Stockholm University Sweden The Oskar Klein Centre Stockholm Sweden INFN Gruppo Collegato di Udine Sezione di Trieste 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 Yale University New Haven Connecticut USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Institute of Physics University of Belgrade Belgrade Serbia Laboratorio de Instrumentacao e Fisica Experimental de Particulas-LIP Lisboa Portugal Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada (Spain) Portugal Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics University of Bern Bern Switzerland Department of Physics Boston University Boston Massachusetts USA Joint Institute for Nuclear Research JINR Dubna Dubna Russia INFN Sezione di Roma Tor Vergata Italy Dipartimento di Fi

Measurements of two-particle correlation functions and the first five azimuthal harmonics, v1 to v5, are presented, using 28 nb−1 of p+Pb collisions at a nucleon-nucleon center-of-mass energy of sNN=5.02 TeV measured with the ATLAS detector at the LHC. Significant long-range “ridgelike” correlations are ob.erved for pairs with small relative azimuthal angle (|Δϕ|<π/3) and back-to-back pairs (|Δϕ|>2π/3) over the transverse momentum range 0.4eV and in different intervals of event activity. The event activity is defined by either the number of reconstructed tracks or the total transverse energy on the Pb-fragmentation side. The azimuthal structure of such long-range correlations is Fourier decomposed to obtain the harmonics vn as a function of pT and event activity. The extracted vn values for n=2 to 5 decrease with n. The v2 and v3 values are found to be positive in the measured pT range. The v1 is also measured as a function of pT and is ob.erved to change sign around pT≈1.5–2.0 GeV and then increase to about 0.1 for pT>4 GeV. The v2(pT), v3(pT), and v4(pT) are compared to the vn coefficients in Pb+Pb collisions at sNN=2.76 TeV with similar event multiplicities. Reasonab.e agreement is ob.erved after accounting for the difference in the average pT of particles produced in the two collision systems.

关键词： NUCLeAR physics PAIRING correlations (Nuclear physics) PARTICLe interactions PROTONS HARMONICS (electric waves) NUCLeAR reactions

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Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λb0→J/ψΛ0 with the ATLAS detector

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Physical Review D 2014年第9期89卷 092009-092009页

作者： G. Aad T. Abajyan b. Abbott J. Abdallah S. Ab.el Khalek O. Abdinov R. Aben b. Abi M. Abolins O. S. AbouZeid H. Abramowicz H. Ab.eu Y. Abulaiti b. S. Acharya L. Adamczyk D. L. Adams J. Adelman S. Adomeit T. Adye T. Agatonovic-Jovin J. A. Aguilar-Saavedra M. Agustoni S. P. Ahlen A. Ahmad F. Ahmadov G. Aielli T. P. A. Åkesson G. Akimoto A. V. Akimov J. Albert S. Albrand M. J. Alconada Verzini M. Aleksa I. N. Aleksandrov C. Alexa G. Alexander G. Alexandre T. Alexopoulos M. Alhroob 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 C. Alpigiani A. Altheimer b. Alvarez Gonzalez M. G. Alviggi K. Amako Y. Amaral Coutinho C. Amelung D. Amidei V. V. Ammosov S. P. Amor Dos Santos A. Amorim S. Amoroso N. Amram G. Amundsen 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 J. P. Araque A. T. H. Arce J-F. Arguin S. Argyropoulos M. Arik A. J. Armbruster O. Arnaez V. Arnal O. Arslan A. Artamonov G. Artoni S. Asai N. Asbah A. Ashkenazi S. Ask b. Åsman L. Asquith K. Assamagan R. Astalos M. Atkinson N. b. Atlay b. Auerbach e. Auge K. Augsten M. Aurousseau G. Avolio G. Azuelos Y. Azuma M. A. baak C. bacci 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 A. A. e. bannoura V. bansal H. S. bansil L. barak S. P. baranov T. barber e. L. barberio D. barberis M. barbero T. barillari M. barisonzi T. barklow N. barlow b. M. barnett R. M. barnett Z. barnovska A. baroncelli G. barone A. J. barr F. barreiro J. barreiro Guimarães da Costa R. bartoldus A. e. barton P. bartos V. bartsch A. bassalat A. basye R. L. bate CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Physikalisches Institut University of Bonn Bonn Germany Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Ohio USA Institute of Physics Academia Sinica Taipei Taiwan 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 Sezione di Trieste 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 Yale University New Haven Connecticut USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Vinca Institute of Nuclear Sciences University of Belgrade Belgrade Serbia Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada (Spain) Portugal Laboratorio de Instrumentacao e Fisica Experimental de Particulas—LIP Lisboa Portugal Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics University of Bern Bern Switzerland Department of Physics Boston University Boston M

A measurement of the parity-violating decay asymmetry parameter, αb, and the helicity amplitudes for the decay Λb0→J/ψ(μ+μ−)Λ0(pπ−) is reported. The analysis is based on 1400 Λb0 and Λ¯b0 baryons selected in 4.6 fb−1 of proton–proton collision data with a center-of-mass energy of 7 TeV recorded by the ATLAS experiment at the LHC. by combining the Λb0 and Λ¯b0 samples under the assumption of CP conservation, the value of αb is measured to be 0.30±0.16(stat)±0.06(syst). This measurement provides a test of theoretical models based on perturbative QCD or heavy-quark effective theory.

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Search for supersymmetry in events with four or more leptons in s=8 TeV pp collisions with the ATLAS detector

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Physical Review D 2014年第5期90卷 052001-052001页

作者： G. Aad b. Abbott J. Abdallah S. Ab.el Khalek O. Abdinov R. Aben b. Abi M. Abolins O. S. AbouZeid H. Abramowicz H. Ab.eu R. Ab.eu Y. Abulaiti b. S. Acharya L. Adamczyk D. L. Adams J. Adelman S. Adomeit T. Adye T. Agatonovic-Jovin J. A. Aguilar-Saavedra M. Agustoni S. P. Ahlen F. Ahmadov G. Aielli H. Akerstedt T. P. A. Åkesson G. Akimoto A. V. Akimov G. L. Alberghi J. Albert S. Albrand M. J. Alconada Verzini M. Aleksa I. N. Aleksandrov C. Alexa G. Alexander G. Alexandre T. Alexopoulos M. Alhroob G. Alimonti L. Alio J. Alison b. M. M. Allbrooke L. J. Allison P. P. Allport J. Almond A. Aloisio A. Alonso F. Alonso C. Alpigiani A. Altheimer b. Alvarez Gonzalez M. G. Alviggi K. Amako Y. Amaral Coutinho C. Amelung D. Amidei S. P. Amor Dos Santos A. Amorim S. Amoroso N. Amram G. Amundsen 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 I. Angelozzi 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 J. P. Araque A. T. H. Arce J-F. Arguin S. Argyropoulos M. Arik A. J. Armbruster O. Arnaez V. Arnal H. Arnold O. Arslan A. Artamonov G. Artoni S. Asai N. Asbah A. Ashkenazi b. Åsman L. Asquith K. Assamagan R. Astalos M. Atkinson N. b. Atlay b. Auerbach K. Augsten M. Aurousseau G. Avolio G. Azuelos Y. Azuma M. A. baak C. bacci H. bachacou K. bachas M. backes M. backhaus J. backus Mayes e. badescu P. bagiacchi P. bagnaia Y. bai T. bain J. T. baines O. K. baker S. baker P. balek F. balli e. banas Sw. banerjee A. bangert A. A. e. bannoura V. bansal H. S. bansil L. barak S. P. baranov e. L. barberio D. barberis M. barbero T. barillari M. barisonzi T. barklow N. barlow b. M. barnett R. M. barnett Z. barnovska A. baroncelli G. barone A. J. barr F. barreiro J. barreiro Guimarães da Costa R. bartoldus A. e. barton P. bartos V. bartsch A. bassalat A. basye R. L. bates L. batkova J. R. batley M. battistin F. bauer H. CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Academia Sinica Taipei Taiwan 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 CERN Geneva Switzerland Department of Physics Stockholm University Sweden The Oskar Klein Centre Stockholm Sweden INFN Gruppo Collegato di Udine Sezione di Trieste 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 Yale University New Haven Connecticut USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Institute of Physics University of Belgrade Belgrade Serbia Laboratorio de Instrumentacao e Fisica Experimental de Particulas–LIP Lisboa Portugal Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada (Spain) Portugal Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics University of Bern Bern Switzerland Department of Physics Boston University Boston Massachusetts USA Joint Institute for Nuclea

Results from a search for supersymmetry in events with four or more leptons including electrons, muons and taus are presented. The analysis uses a data sample corresponding to 20.3 fb−1 of proton-proton collisions delivered by the Large Hadron Collider at s=8 TeV and recorded by the ATLAS detector. Signal regions are designed to target supersymmetric scenarios that can be either enriched in or depleted of events involving the production of a Z boson. No significant deviations are ob.erved in data from standard model predictions and results are used to set upper limits on the event yields from processes beyond the standard model. exclusion limits at the 95% confidence level on the masses of relevant supersymmetric particles are obtained. In R-parity-violating simplified models with decays of the lightest supersymmetric particle to electrons and muons, limits of 1350 and 750 GeV are placed on gluino and chargino masses, respectively. In R-parity-conserving simplified models with heavy neutralinos decaying to a massless lightest supersymmetric particle, heavy neutralino masses up to 620 GeV are excluded. Limits are also placed on other supersymmetric scenarios.

关键词： SUPeRSYMMeTRY (Physics) LePTONS (Nuclear physics) COLLISIONS (Nuclear physics) NUCLeAR counters LARGe Hadron Collider (France & Switzerland) CP violation (Nuclear physics)

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Measurement of the Higgs boson mass from the H→γγ and H→ZZ*→4ℓ channels in pp collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector

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Physical Review D 2014年第5期90卷 052004-052004页

作者： G. Aad b. Abbott J. Abdallah S. Ab.el Khalek O. Abdinov R. Aben b. Abi S. H. Abidi M. Abolins O. S. AbouZeid H. Abramowicz H. Ab.eu R. Ab.eu Y. Abulaiti b. S. Acharya L. Adamczyk D. L. Adams J. Adelman S. Adomeit T. Adye T. Agatonovic-Jovin J. A. Aguilar-Saavedra M. Agustoni S. P. Ahlen F. Ahmadov G. Aielli H. Akerstedt T. P. A. Åkesson G. Akimoto A. V. Akimov G. L. Alberghi J. Albert S. Albrand M. J. Alconada Verzini M. Aleksa I. N. Aleksandrov C. Alexa G. Alexander G. Alexandre T. Alexopoulos M. Alhroob G. Alimonti L. Alio J. Alison b. M. M. Allbrooke L. J. Allison P. P. Allport J. Almond A. Aloisio A. Alonso F. Alonso C. Alpigiani A. Altheimer b. Alvarez Gonzalez M. G. Alviggi K. Amako Y. Amaral Coutinho C. Amelung D. Amidei S. P. Amor Dos Santos A. Amorim S. Amoroso N. Amram G. Amundsen 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 I. Angelozzi 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 J. P. Araque A. T. H. Arce J-F. Arguin S. Argyropoulos M. Arik A. J. Armbruster O. Arnaez V. Arnal H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Asai N. Asbah A. Ashkenazi b. Åsman L. Asquith K. Assamagan R. Astalos M. Atkinson N. b. Atlay b. Auerbach K. Augsten M. Aurousseau G. Avolio G. Azuelos Y. Azuma M. A. baak A. baas C. bacci H. bachacou K. bachas M. backes M. backhaus J. backus Mayes e. badescu P. bagiacchi P. bagnaia Y. bai T. bain J. T. baines O. K. baker P. balek F. balli e. banas Sw. banerjee A. A. e. bannoura V. bansal H. S. bansil L. barak S. P. baranov e. L. barberio D. barberis M. barbero T. barillari M. barisonzi T. barklow N. barlow b. M. barnett R. M. barnett Z. barnovska A. baroncelli G. barone A. J. barr F. barreiro J. barreiro Guimarães da Costa R. bartoldus A. e. barton P. bartos V. bartsch A. bassalat A. basye R. L. bates J. R. batley M. battaglia M. battisti CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Academia Sinica Taipei Taiwan 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 University of Toronto Toronto Ontario Canada Department of Physics and Astronomy Michigan State University East Lansing Michigan USA Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion: Israel Institute of Technology Haifa Israel CERN Geneva Switzerland Department of Physics Stockholm University Stockholm Sweden The Oskar Klein Centre Stockholm Sweden INFN Gruppo Collegato di Udine Sezione di Trieste 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 Yale University New Haven Connecticut USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Institute of Physics University of Belgrade Belgrade Serbia Laboratorio de Instrumentacao e Fisica Experimental de Particulas - LIP Lisboa Portugal Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada (Spain) Portugal Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics University of Bern Bern Switzerland Department of Physics Boston University Boston Massachusetts USA Joint Institute for Nuclear Research JINR Dubna Dubna Russia INFN Sezione di Roma Tor Vergata Roma Italy

An improved measurement of the mass of the Higgs boson is derived from a combined fit to the reconstructed invariant mass spectra of the decay channels H→γγ and H→ZZ*→4ℓ. The analysis uses the pp collision data sample recorded by the ATLAS experiment at the CeRN Large Hadron Collider at center-of-mass energies of 7 TeV and 8 TeV, corresponding to an integrated luminosity of 25 fb−1. The measured value of the Higgs boson mass is mH=125.36±0.37(stat)±0.18(syst) GeV. This result is based on improved energy-scale calibrations for photons, electrons, and muons as well as other analysis improvements, and supersedes the previous result from ATLAS. Upper limits on the total width of the Higgs boson are derived from fits to the invariant mass spectra of the H→γγ and H→ZZ*→4ℓ decay channels.

关键词： Higgs bosons Nuclear counters -- Calibration Collisions (Nuclear physics) Center of mass Large Hadron Collider (France & Switzerland)

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Study of heavy-flavor quarks produced in association with top-quark pairs at s=7 TeV using the ATLAS detector

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Physical Review D 2014年第7期89卷 072012-072012页

作者： G. Aad T. Abajyan b. Abbott J. Abdallah S. Ab.el Khalek A. A. Ab.elalim O. Abdinov R. Aben b. Abi M. Abolins O. S. AbouZeid H. Abramowicz H. Ab.eu Y. Abulaiti b. S. Acharya L. Adamczyk D. L. Adams T. N. Addy J. Adelman S. Adomeit T. Adye S. Aefsky J. A. Aguilar-Saavedra M. Agustoni S. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli T. P. A. Åkesson G. Akimoto A. V. Akimov M. A. Alam J. Albert S. Albrand M. Aleksa I. N. Aleksandrov F. Alessandria C. Alexa G. Alexander G. Alexandre T. Alexopoulos M. Alhroob M. Aliev G. Alimonti 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 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. 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 S. Ask b. Åsman L. Asquith K. Assamagan R. Astalos A. Astbury M. Atkinson b. Auerbach e. Auge K. Augsten M. Aurousseau G. Avolio D. Axen G. Azuelos Y. Azuma M. A. baak G. baccaglioni C. bacci A. M. bach H. bachacou K. bachas M. backes M. backhaus J. backus Mayes e. badescu P. bagnaia Y. bai D. C. bailey T. bain J. T. baines O. K. baker S. baker P. balek F. balli e. banas P. banerjee 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. bates L. batkova J. R. batley A. battaglia M. battistin 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 and ICREA Barcelona Spain LAL Université Paris-Sud and CNRS/IN2P3 Orsay France Section de Physique Université de Genève Geneva Switzerland 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 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 Phys

Using a sample of dilepton top-quark pair (tt¯) candidate events, a study is performed of the production of top-quark pairs together with heavy-flavor (HF) quarks, the sum of tt¯+b+X and tt¯+c+X, collectively referred to as tt¯ + HF. The data set used corresponds to an integrated luminosity of 4.7 fb−1 of proton-proton collisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the CeRN Large Hadron Collider. The presence of additional HF (b or c) quarks in the tt¯ sample is inferred by looking for events with at least three b-tagged jets, where two are attributed to the b quarks from the tt¯ decays and the third to additional HF production. The dominant background to tt¯ + HF in this sample is tt¯+jet events in which a light-flavor jet is misidentified as a heavy-flavor jet. To determine the heavy- and light-flavor content of the additional b-tagged jets, a fit to the vertex mass distribution of b-tagged jets in the sample is performed. The result of the fit shows that 79 ± 14 (stat) ± 22 (syst) of the 105 selected extra b-tagged jets originate from HF quarks, 3 standard deviations away from the hypothesis of zero tt¯ + HF production. The result for extra HF production is quoted as a ratio (RHF) of the cross section for tt¯ + HF production to the cross section for tt¯ production with at least one additional jet. both cross sections are measured in a fiducial kinematic region within the ATLAS acceptance. RHF is measured to be [6.2±1.1(stat)±1.8(syst)]% for jets with pT>25 GeV and |η|<2.5, in agreement with the expectations from Monte Carlo generators.

关键词： DILePTON production QUARKS ReSeARCH STANDARD deviations CROSS sections (Nuclear physics) MONTe Carlo method PROTON-proton interactions

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Measurement of Higgs boson production in the diphoton decay channel in pp collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector

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Physical Review D 2014年第11期90卷 112015-112015页

作者： G. Aad b. Abbott J. Abdallah S. Ab.el Khalek O. Abdinov R. Aben b. Abi M. Abolins O. S. AbouZeid H. Abramowicz H. Ab.eu R. Ab.eu Y. Abulaiti b. S. Acharya L. Adamczyk D. L. Adams J. Adelman S. Adomeit T. Adye T. Agatonovic-Jovin J. A. Aguilar-Saavedra M. Agustoni S. P. Ahlen F. Ahmadov G. Aielli H. Akerstedt T. P. A. Åkesson G. Akimoto A. V. Akimov G. L. Alberghi J. Albert S. Albrand M. J. Alconada Verzini M. Aleksa I. N. Aleksandrov C. Alexa G. Alexander G. Alexandre T. Alexopoulos M. Alhroob G. Alimonti L. Alio J. Alison b. M. M. Allbrooke L. J. Allison P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. Altheimer b. Alvarez Gonzalez M. G. Alviggi K. Amako Y. Amaral Coutinho C. Amelung D. Amidei S. P. Amor Dos Santos A. Amorim S. Amoroso N. Amram G. Amundsen 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 I. Angelozzi 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 J. P. Araque A. T. H. Arce J-F. Arguin S. Argyropoulos M. Arik A. J. Armbruster O. Arnaez V. Arnal H. Arnold M. Arratia O. Arslan A. Artamonov G. Artoni S. Asai N. Asbah A. Ashkenazi b. Åsman L. Asquith K. Assamagan R. Astalos M. Atkinson N. b. Atlay b. Auerbach K. Augsten M. Aurousseau G. Avolio G. Azuelos Y. Azuma M. A. baak A. e. baas C. bacci H. bachacou K. bachas M. backes M. backhaus J. backus Mayes e. badescu P. bagiacchi P. bagnaia Y. bai T. bain J. T. baines O. K. baker P. balek F. balli e. banas Sw. banerjee A. A. e. bannoura V. bansal H. S. bansil L. barak S. P. baranov e. L. barberio D. barberis M. barbero T. barillari M. barisonzi T. barklow N. barlow b. M. barnett R. M. barnett Z. barnovska A. baroncelli G. barone A. J. barr F. barreiro J. barreiro Guimarães da Costa R. bartoldus A. e. barton P. bartos V. bartsch A. bassalat A. basye R. L. bates J. R. batley M. battaglia M. battistin F. bauer H. S. ba CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Academia Sinica Taipei Taiwan 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 Department of Physics Technion: Israel Institute of Technology Haifa Israel CERN Geneva Switzerland Department of Physics Stockholm University Stockholm Sweden The Oskar Klein Centre Stockholm Sweden INFN Gruppo Collegato di Udine Sezione di Trieste Udine Italy ICTP Trieste Italy Faculty of Physics and Applied Computer Science AGH University of Science and Technology Krakow Poland Physics Department Brookhaven National Laboratory Upton New York USA Department of Physics Yale University New Haven Conneticut USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Institute of Physics University of Belgrade Belgrade Serbia Laboratorio de Instrumentacao e Fisica Experimental de Particulas - LIP Lisboa Portugal 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 Physics University of Bern Bern Switzerland Department of Physics Boston University Boston Massachusetts USA Joint Institute for Nuclear Research JINR Dubna Dubna Russia INFN Sezione di Roma Tor Vergata Roma Italy Dipartiment

A measurement of the production processes of the recently discovered Higgs boson is performed in the two-photon final state using 4.5 fb−1 of proton-proton collisions data at s=7 TeV and 20.3 fb−1 at s=8 TeV collected by the ATLAS detector at the Large Hadron Collider. The number of ob.erved Higgs boson decays to diphotons divided by the corresponding Standard Model prediction, called the signal strength, is found to be μ=1.17±0.27 at the value of the Higgs boson mass measured by ATLAS, mH=125.4 GeV. The analysis is optimized to measure the signal strengths for individual Higgs boson production processes at this value of mH. They are found to be μggF=1.32±0.38, μVbF=0.8±0.7, μWH=1.0±1.6, μZH=0.1−0.1+3.7, and μtt¯H=1.6−1.8+2.7, for Higgs boson production through gluon fusion, vector-boson fusion, and in association with a W or Z boson or a top-quark pair, respectively. Compared with the previously published ATLAS analysis, the results reported here also benefit from a new energy calibration procedure for photons and the sub.equent reduction of the systematic uncertainty on the diphoton mass resolution. No significant deviations from the predictions of the Standard Model are found.

关键词： HIGGS bosons PROTON-proton interactions TOP quarks PARTICLe decays PHOTON detectors STANDARD model (Nuclear physics)

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Search for a multi-Higgs-boson cascade in W+W−bb¯ events with the ATLAS detector in pp collisions at s=8 TeV

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Physical Review D 2014年第3期89卷 032002-032002页

作者： G. Aad T. Abajyan b. Abbott J. Abdallah S. Ab.el Khalek O. Abdinov R. Aben b. Abi M. Abolins O. S. AbouZeid H. Abramowicz H. Ab.eu 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 F. Ahmadov 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 G. Amundsen 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 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 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 P. bartos V. bartsch 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 Mississippi 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 Ene

A search is presented for new particles in an extension to the Standard Model that includes a heavy Higgs boson (H0), an intermediate charged Higgs-boson pair (H±), and a light Higgs boson (h0). The analysis searches for events involving the production of a single heavy neutral Higgs boson which decays to the charged Higgs boson and a W boson, where the charged Higgs boson sub.equently decays into a W boson and the lightest neutral Higgs boson decaying to a bottom–antibottom-quark pair. Such a cascade results in a W-boson pair and a bottom–antibottom-quark pair in the final state. events with exactly one lepton, missing transverse momentum, and at least four jets are selected from a data sample corresponding to an integrated luminosity of 20.3 fb−1, collected by the ATLAS detector in proton-proton collisions at s=8 TeV at the LHC. The data are found to be consistent with Standard Model predictions, and 95% confidence-level upper limits are set on the product of cross section and branching ratio. These limits range from 0.065 to 43 pb as a function of H0 and H± masses, with mh0 fixed at 125 GeV.

关键词： HIGGS bosons PARTICLeS (Nuclear physics) -- Research STANDARD model (Nuclear physics) LePTONS (Nuclear physics) PARTICLe decays

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33 High-resolution cryo-eM structure of theTrypanosoma brucei80S: a unique eukaryotic ribosome

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Journal of biomolecular Structure and Dynamics 2013年第SUPP 1期31卷 20页

作者： Amy Jobe[a][*] Yaser Hashem[a] Amedee des Georges[a] Jie Fu[b] Sarah N. buss[c] Fabrice Jossinet[d] Qin Zhang[e] Hstau Y. Liao[b] bob Grassucci[c] Chandrajit bajaj[e] Susan Madison-Antenucci[c] eric Westhof[d] & Joachim Frank[a][b][f] [a] HHMI Department of Biochemistry and Molecular Biophysics Columbia University New York NY USA [b] Department of Biochemistry and Molecular Biophysics Columbia University New York NY USA [c] Division of Infectious Diseases Wadsworth Center New York State Department of Health Albany NY USA [d] Architecture et Réactivité de l’ARN Université de Strasbourg Institut de Biologie Moléculaire et Cellulaire (CNRS) Strasbourg France [e] Department of Computer Science Institute for Computational Engineering and Sciences University of Texas Austin TX USA [f] Department of Biological Sciences Columbia University New York NY USA

eukaryotic 80S ribosomes of known structure are far more complex than their 70S bacterial counterparts. Those fromSaccharomyces cerevisiae,Tetrahymena thermophila, andTriticum aestivum, for example, bear insertions of ribosomal RNA (rRNA) called expansion segments (eS) and additional ribosomal proteins. The ribosomes of the kinetoplastidTrypanosoma brucei, though, are especially fascinating: structurally and their other kinetoplastids’ ribosomes bear very large eSs, as well as smaller eSs, and protein extensions. Additionally,T. bruceiribosomes require novel protein factors for maturation, although they do not require several eukaryotic initiation factors or a recycling factor. As a species,T. bruceiis fascinating not only in terms of structure, but also in terms of gene expression and even public health: the species is responsib.e for the incurab.e, terminal human African Trypanosomiasis (sleeping sickness); and during post-transcriptional regulation, a single common RNA segment called a splice leader is trans-spliced onto the 5′ ends of many ofT. brucei’s mRNAs. The purpose of this splice event in translation is unknown. Here, we present a high-resolution structure of theT. bruceiribosome which contributes a great deal to addressing the above unknowns. We have employed map segmentation, homology modeling, ab initio rRNA modeling, and Molecular Dynamics Flexib.e Fitting (MDFF) to model the ribosome’s atomic structure. The positions and structures of the ribosome’s novel eSs and protein extensions were previously unknown, but our structure reveals the precise spatial contexts of these components. With this information in hand, we can begin to decipherT. brucei’s unusual translational requirements.

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