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search for pair-produced heavy quarks decaying to Wq in the two-lepton channel at (s)=7 Tev with the ATLAs detector

Physical Review D 2012年第1期86卷 012007-012007页

作者： G. Aad b. Abbott J. Abdallah A. A. Abdelalim A. Abdesselam O. Abdinov b. Abi M. Abolins O. s. AbouZeid H. Abramowicz H. Abreu E. Acerbi b. s. Acharya L. Adamczyk D. L. Adams T. N. Addy J. Adelman M. Aderholz s. Adomeit P. Adragna T. Adye s. Aefsky J. A. Aguilar-saavedra M. Aharrouche s. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli T. Akdogan T. P. A. Åkesson G. Akimoto A. v. Akimov A. Akiyama M. s. Alam 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 M. Aliyev b. M. M. Allbrooke P. P. Allport s. E. Allwood-spiers J. Almond A. Aloisio R. Alon A. Alonso b. Alvarez Gonzalez M. G. Alviggi K. Amako P. Amaral C. Amelung v. v. Ammosov A. Amorim G. Amorós N. Amram C. Anastopoulos L. s. Ancu N. Andari T. Andeen C. F. Anders G. Anders K. J. Anderson A. Andreazza v. Andrei M-L. Andrieux X. s. Anduaga A. Angerami F. Anghinolfi A. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli s. Aoun L. Aperio bella R. Apolle G. Arabidze I. Aracena Y. Arai A. T. H. Arce s. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armbruster O. Arnaez C. Arnault A. Artamonov G. Artoni D. Arutinov s. Asai R. Asfandiyarov s. Ask b. Åsman L. Asquith K. Assamagan A. Astbury A. Astvatsatourov b. Aubert E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen C. Ay G. Azuelos Y. Azuma M. A. baak G. baccaglioni C. bacci A. M. bach H. bachacou K. bachas M. backes M. backhaus E. badescu P. bagnaia s. bahinipati Y. bai D. C. bailey T. bain J. T. baines O. K. baker M. D. baker s. baker E. banas P. banerjee sw. banerjee D. banfi A. bangert v. bansal H. s. bansil L. barak s. P. baranov A. barashkou A. barbaro Galtieri 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 P. barrillon R. bartoldus A. E. barton v. bartsch R. L. bates L. batkova J. R. batl Fakultät für Mathematik und Physik Albert-Ludwigs-Universität Freiburg i.Br. 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 Section de Physique Université de Genève Geneva Switzerland Department of Physics Oxford University Oxford United Kingdom Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan 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 Ontatio Canada Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel LAL Université Paris-Sud and CNRS/IN2P3 Orsay France INFN Sezione di Milano Italy Dipartimento di Fisica Università di Milano Milano Italy 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 Max-Planck-Institut für Physik (Werner-Heisenberg-Institut) München Germany Fakultät für Physik Ludwig-Maximilians-Universität München München Germany School of Physics and Astronomy Queen Mary University of London London United Kingdom 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 Institut für Physik Universität Mainz Mainz Germany Department of Physics Boston University Boston Massachusetts USA Departments of Physics & Astronomy and Chemistry Stony Br

A search is presented for heavy-quark pair production (QQ¯) under the decay hypothesis QQ¯→W+qW−q¯ with q=d, s, b for up-type Q or q=u, c for down-type Q. The search is performed with 1.04 fb−1 of integrated luminosity from pp collisions at s=7 Tev collected by the ATLAs detector at the CERN LHC. Dilepton final states are selected, requiring large missing transverse momentum and at least two jets. Mass reconstruction of heavy-quark candidates is performed by assuming that the W boson decay products are nearly collinear. The data are in agreement with standard model expectations; a heavy quark with mass less than 350 Gev is excluded at 95% confidence level.

关键词： PAIR production QUARKs RADIOACTIvE decay LEPTONs (Nuclear physics) sTANDARD model (Nuclear physics) DILEPTON production

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search for excited leptons in proton-proton collisions at s=7 Tev with the ATLAs detector

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Physical Review D 2012年第7期85卷 072003-072003页

作者： G. Aad b. Abbott J. Abdallah A. A. Abdelalim A. Abdesselam O. Abdinov b. Abi M. Abolins O. s. AbouZeid H. Abramowicz H. Abreu E. Acerbi b. s. Acharya L. Adamczyk D. L. Adams T. N. Addy J. Adelman M. Aderholz s. Adomeit P. Adragna T. Adye s. Aefsky J. A. Aguilar-saavedra M. Aharrouche s. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli T. Akdogan T. P. A. Åkesson G. Akimoto A. v. Akimov A. Akiyama M. s. Alam 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 M. Aliyev b. M. M. Allbrooke P. P. Allport s. E. Allwood-spiers J. Almond A. Aloisio R. Alon A. Alonso b. Alvarez Gonzalez M. G. Alviggi K. Amako P. Amaral C. Amelung v. v. Ammosov A. Amorim G. Amorós N. Amram C. Anastopoulos L. s. Ancu N. Andari T. Andeen C. F. Anders G. Anders K. J. Anderson A. Andreazza v. Andrei M-L. Andrieux X. s. Anduaga A. Angerami F. Anghinolfi A. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli s. Aoun L. Aperio bella R. Apolle G. Arabidze I. Aracena Y. Arai A. T. H. Arce s. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armbruster O. Arnaez C. Arnault A. Artamonov G. Artoni D. Arutinov s. Asai R. Asfandiyarov s. Ask b. Åsman L. Asquith K. Assamagan A. Astbury A. Astvatsatourov b. Aubert E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen C. Ay G. Azuelos Y. Azuma M. A. baak G. baccaglioni C. bacci A. M. bach H. bachacou K. bachas M. backes M. backhaus E. badescu P. bagnaia s. bahinipati Y. bai D. C. bailey T. bain J. T. baines O. K. baker M. D. baker s. baker E. banas P. banerjee sw. banerjee D. banfi A. bangert v. bansal H. s. bansil L. barak s. P. baranov A. barashkou A. barbaro Galtieri 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 P. barrillon R. bartoldus A. E. barton v. bartsch R. L. bates L. batkova J. R. batl Fakultät für Mathematik und Physik Albert-Ludwigs-Universität Freiburg i.Br. 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 Section de Physique Université de Genève Geneva Switzerland Department of Physics Oxford University Oxford United Kingdom Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan 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 LAL Université Paris-Sud and CNRS/IN2P3 Orsay France INFN Sezione di Milano Italy Dipartimento di Fisica Università di Milano Milano Italy 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 United States of America USA Department of Physics Hampton University Hampton Virginia USA Department of Physics Yale University New Haven Connecticut USA Max-Planck-Institut für Physik (Werner-Heisenberg-Institut) München Germany Fakultät für Physik Ludwig-Maximilians-Universität München München Germany School of Physics and Astronomy Queen Mary University of London London United Kingdom 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 Portugal Institut für Physik Universität Mainz Mainz Germany Department of Physics Boston University Boston Massachusetts USA Departments of Physics & Astr

The ATLAs detector is used to search for excited leptons in the electromagnetic radiative decay channel ℓ*→ℓγ. Results are presented based on the analysis of pp collisions at a center-of-mass energy of 7 Tev corresponding to an integrated luminosity of 2.05 fb−1. No evidence for excited leptons is found, and limits are set on the compositeness scale Λ as a function of the excited lepton mass mℓ*. In the special case where Λ=mℓ*, excited electron and muon masses below 1.87 Tev and 1.75 Tev are excluded at 95% C.L., respectively.

关键词： LEPTONs (Nuclear physics) PROTON-proton interactions QUARKs ELECTROMAGNETIsM PHOTON detectors COLLIDERs (Nuclear physics)

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Measurement of the azimuthal ordering of charged hadrons with the ATLAs detector

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Physical Review D 2012年第5期86卷 052005-052005页

作者： G. Aad b. Abbott J. Abdallah A. A. Abdelalim A. Abdesselam O. Abdinov b. Abi M. Abolins O. s. AbouZeid H. Abramowicz H. Abreu E. Acerbi b. s. Acharya L. Adamczyk D. L. Adams T. N. Addy J. Adelman M. Aderholz s. Adomeit P. Adragna T. Adye s. Aefsky J. A. Aguilar-saavedra M. Aharrouche s. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli T. Akdogan T. P. A. Åkesson G. Akimoto A. v. Akimov A. Akiyama M. s. Alam 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 M. Aliyev P. P. Allport s. E. Allwood-spiers J. Almond A. Aloisio R. Alon A. Alonso b. Alvarez Gonzalez M. G. Alviggi K. Amako P. Amaral C. Amelung v. v. Ammosov A. Amorim G. Amorós N. Amram C. Anastopoulos L. s. Ancu N. Andari T. Andeen C. F. Anders G. Anders K. J. Anderson A. Andreazza v. Andrei M-L. Andrieux X. s. Anduaga A. Angerami F. Anghinolfi A. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli s. Aoun L. Aperio bella R. Apolle G. Arabidze I. Aracena Y. Arai A. T. H. Arce J. P. Archambault s. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armbruster O. Arnaez C. Arnault A. Artamonov G. Artoni D. Arutinov s. Asai R. Asfandiyarov s. Ask b. Åsman L. Asquith K. Assamagan A. Astbury A. Astvatsatourov b. Aubert E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen C. Ay G. Azuelos Y. Azuma M. A. baak G. baccaglioni C. bacci A. M. bach H. bachacou K. bachas G. bachy M. backes M. backhaus E. badescu P. bagnaia s. bahinipati Y. bai D. C. bailey T. bain J. T. baines O. K. baker M. D. baker s. baker E. banas P. banerjee sw. banerjee D. banfi A. bangert v. bansal H. s. bansil L. barak s. P. baranov A. barashkou A. barbaro Galtieri 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 P. barrillon R. bartoldus A. E. barton v. bartsch R. L. bates L. batkova J. Fakultät für Mathematik und Physik Albert-Ludwigs-Universität Freiburg i.Br. 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 Section de Physique Université de Genève Geneva Switzerland Department of Physics Oxford University Oxford United Kingdom Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan 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 LAL Univ. Paris-Sud and CNRS/IN2P3 Orsay France INFN Sezione di Milano Milano Italy Dipartimento di Fisica Università di Milano Milano Italy 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 Max-Planck-Institut für Physik (Werner-Heisenberg-Institut) München Germany Fakultät für Physik Ludwig-Maximilians-Universität München München Germany School of Physics and Astronomy Queen Mary University of London London United Kingdom 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 Institut für Physik Universität Mainz Mainz Germany Department of Physics Boston University Boston Massachusetts USA Departments of Physics & Astronomy and Chemistry

This paper presents a study of the possible ordering of charged hadrons in the azimuthal angle relative to the beam axis in high-energy proton-proton collisions at the Large Hadron Collider (LHC). A spectral analysis of correlations between longitudinal and transverse components of the momentum of the charged hadrons, driven by the search for phenomena related to the structure of the QCD field, is performed. Data were recorded with the ATLAs detector at center-of-mass energies of s=900 Gev and s=7 Tev. The correlations measured in a kinematic region dominated by low-pT particles are not well described by conventional models of hadron production. The measured spectra show features consistent with the fragmentation of a QCD string represented by a helixlike ordered gluon chain.

关键词： HADRONs PROTON-proton interactions LARGE Hadron Collider (France & switzerland) MOMENTUM (Mechanics) QUANTUM chromodynamics CENTER of mass

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speed gradient control of qubit state *

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IFAC Proceedings volumes 2010年第11期43卷 81-85页

作者： sergei borisenok Alexander Fradkov Anton Proskurnikov Dept. of Mathematics and Computer Science Faculty of Science and Letters Istanbul Kültür University Bakιrköy 34156 Istanbul Turkey Abdus Salam School of Mathematical Sciences Government College University 68-B New Muslim Town 54600 Lahore Pakistan Institute of Problems in Mechanical Engineering Russian Academy of Sciences 61 Bolshoy V.O. 199178 St.Petersburg Russia Dept. Theoretical Cybernetics St.Petersburg State University 28 Universitetsky prospekt 198504 Peterhof St.Petersburg Russia

A closed-loop (feedback) based algorithm calculating the classical external field for efficient control of qubit state is proposed. The approach is illustrated with two-level atomic system (with decay) driven by classical optical field. It is shown analytically and by simulation that the proposed method allows one to achieve the desired state expressed as the difference of the density matrix diagonal elements.

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Combined search for the standard Model Higgs boson in pp collisions at s=7 Tev with the ATLAs detector

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Physical Review D 2012年第3期86卷 032003-032003页

作者： G. Aad T. Abajyan b. Abbott J. Abdallah s. Abdel Khalek A. A. Abdelalim O. Abdinov R. Aben b. Abi M. Abolins O. s. AbouZeid H. Abramowicz H. Abreu E. Acerbi b. s. Acharya L. Adamczyk D. L. Adams T. N. Addy J. Adelman s. Adomeit P. Adragna T. Adye s. Aefsky J. A. Aguilar-saavedra M. Agustoni M. Aharrouche s. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli T. Akdogan T. P. A. Åkesson G. Akimoto A. v. Akimov M. s. Alam 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 P. P. Allport s. E. Allwood-spiers J. Almond A. Aloisio R. Alon A. Alonso F. Alonso b. Alvarez Gonzalez M. G. Alviggi K. Amako C. Amelung v. v. Ammosov A. Amorim 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 P. Anger A. Angerami F. Anghinolfi A. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli M. Aoki s. Aoun L. Aperio bella R. Apolle G. Arabidze I. Aracena Y. Arai A. T. H. Arce s. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armbruster O. Arnaez v. Arnal C. Arnault A. Artamonov G. Artoni D. Arutinov s. Asai R. Asfandiyarov s. Ask b. Åsman L. Asquith K. Assamagan A. Astbury b. Aubert E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen G. Azuelos Y. Azuma M. A. baak G. baccaglioni C. bacci A. M. bach H. bachacou K. bachas M. backes M. backhaus E. badescu P. bagnaia s. bahinipati Y. bai D. C. bailey T. bain J. T. baines O. K. baker M. D. baker s. baker E. banas P. banerjee sw. banerjee D. banfi A. bangert v. bansal H. s. bansil L. barak s. P. baranov A. barbaro Galtieri 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 P. barrillon R. bartoldus A. E. barton v. bartsch R. L. bates L. batkova J. R. batley A. battaglia M. battistin F. bau Fakultät für Mathematik und Physik Albert-Ludwigs-Universität Freiburg i.Br. 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 a l’Energie Atomique) Gif-sur-Yvette France INFN Sezione di Milano Italy Dipartimento di Fisica Università di Milano Milano Italy 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 School of Physics and Astronomy Queen Mary University of London London United Kingdom 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 Cent

A combined search for the standard Model Higgs boson with the ATLAs detector at the LHC is presented. The data sets used correspond to integrated luminosities from 4.6 fb−1 to 4.9 fb−1 of proton-proton collisions collected at s=7 Tev in 2011. The Higgs boson mass ranges of 111.4 Gev to 116.6 Gev, 119.4 Gev to 122.1 Gev, and 129.2 Gev to 541 Gev are excluded at the 95% confidence level, while the range 120 Gev to 560 Gev is expected to be excluded in the absence of a signal. An excess of events is observed at Higgs boson mass hypotheses around 126 Gev with a local significance of 2.9 standard deviations (σ). The global probability for the background to produce an excess at least as significant anywhere in the entire explored Higgs boson mass range of 110–600 Gev is estimated to be ∼15%, corresponding to a significance of approximately 1σ.

关键词： sTANDARD model (Nuclear physics) HIGGs bosons PROTON-proton interactions PARTICLE accelerators LARGE Hadron Collider (France & switzerland) sTANDARD deviations

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search for resonant WZ production in the WZ→lνl′l′ channel in (s)=7 Tev pp collisions with the ATLAs detector

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Physical Review D 2012年第11期85卷 112012-112012页

作者： G. Aad b. Abbott J. Abdallah s. Abdel Khalek A. A. Abdelalim A. Abdesselam O. Abdinov b. Abi M. Abolins O. s. AbouZeid H. Abramowicz H. Abreu E. Acerbi b. s. Acharya L. Adamczyk D. L. Adams T. N. Addy J. Adelman M. Aderholz s. Adomeit P. Adragna T. Adye s. Aefsky J. A. Aguilar-saavedra M. Aharrouche s. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli T. Akdogan T. P. A. Åkesson G. Akimoto A. v. Akimov A. Akiyama M. s. Alam 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 M. Aliyev b. M. M. Allbrooke P. P. Allport s. E. Allwood-spiers J. Almond A. Aloisio R. Alon A. Alonso b. Alvarez Gonzalez M. G. Alviggi K. Amako P. Amaral C. Amelung v. v. Ammosov A. Amorim G. Amorós N. Amram C. Anastopoulos L. s. Ancu N. Andari T. Andeen C. F. Anders G. Anders K. J. Anderson A. Andreazza v. Andrei M-L. Andrieux X. s. Anduaga A. Angerami F. Anghinolfi A. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli s. Aoun L. Aperio bella R. Apolle G. Arabidze I. Aracena Y. Arai A. T. H. Arce s. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armbruster O. Arnaez v. Arnal C. Arnault A. Artamonov G. Artoni D. Arutinov s. Asai R. Asfandiyarov s. Ask b. Åsman L. Asquith K. Assamagan A. Astbury b. Aubert E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen C. Ay G. Azuelos Y. Azuma M. A. baak G. baccaglioni C. bacci A. M. bach H. bachacou K. bachas M. backes M. backhaus E. badescu P. bagnaia s. bahinipati Y. bai D. C. bailey T. bain J. T. baines O. K. baker M. D. baker s. baker E. banas P. banerjee sw. banerjee D. banfi A. bangert v. bansal H. s. bansil L. barak s. P. baranov A. barashkou A. barbaro Galtieri 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 P. barrillon R. bartoldus A. E. barton v. bartsch R. L. bates L. batkova J. Fakultät für Mathematik und Physik Albert-Ludwigs-Universität Freiburg 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 Univ. Paris-Sud and CNRS/IN2P3 Orsay France Section de Physique Université de Genève Geneva Switzerland Department of Physics Oxford University Oxford United Kingdom Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan 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 a l’Energie Atomique) Gif-sur-Yvette France INFN Sezione di Milano Italy Dipartimento di Fisica Università di Milano Milano Italy 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 Max-Planck-Institut für Physik (Werner-Heisenberg-Institut) München Germany Fakultät für Physik Ludwig-Maximilians-Universität München München Germany School of Physics and Astronomy Queen Mary University of London London United Kingdom 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 Institut für Physik Universität Mainz Mainz

A generic search is presented for a heavy particle decaying to WZ→ℓνℓ′ℓ′ (ℓ, ℓ′=e, μ) final states. The data were recorded by the ATLAs detector in s=7 Tev pp collisions at the Large Hadron Collider and correspond to an integrated luminosity of 1.02 fb−1. The transverse mass distribution of the selected WZ candidates is found to be consistent with the standard model expectation. Upper limits on the production cross section times branching ratio are derived using two benchmark models predicting a heavy particle decaying to a WZ pair.

关键词： COLLIsIONs (Nuclear physics) PREDICTION (Logic) PARTICLEs (Nuclear physics) RADIOACTIvE decay sTANDARD model (Nuclear physics) ATOMIC mass CROss sections (Nuclear physics)

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Underlying event characteristics and their dependence on jet size of charged-particle jet events in pp collisions at (s)=7 Tev with the ATLAs detector

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Physical Review D 2012年第7期86卷 072004-072004页

作者： G. Aad b. Abbott J. Abdallah s. Abdel Khalek A. A. Abdelalim O. Abdinov b. Abi M. Abolins O. s. AbouZeid H. Abramowicz H. Abreu E. Acerbi b. s. Acharya L. Adamczyk D. L. Adams T. N. Addy J. Adelman s. Adomeit P. Adragna T. Adye s. Aefsky J. A. Aguilar-saavedra M. Aharrouche s. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli T. Akdogan T. P. A. Åkesson G. Akimoto A. v. Akimov A. Akiyama M. s. Alam 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 P. P. Allport s. E. Allwood-spiers J. Almond A. Aloisio R. Alon A. Alonso b. Alvarez Gonzalez M. G. Alviggi K. Amako C. Amelung v. v. Ammosov A. Amorim 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 P. Anger A. Angerami F. Anghinolfi A. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli s. Aoun L. Aperio bella R. Apolle G. Arabidze I. Aracena Y. Arai A. T. H. Arce s. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armbruster O. Arnaez v. Arnal C. Arnault A. Artamonov G. Artoni D. Arutinov s. Asai R. Asfandiyarov s. Ask b. Åsman L. Asquith K. Assamagan A. Astbury b. Aubert E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen G. Azuelos Y. Azuma M. A. baak G. baccaglioni C. bacci A. M. bach H. bachacou K. bachas M. backes M. backhaus E. badescu P. bagnaia s. bahinipati Y. bai D. C. bailey T. bain J. T. baines O. K. baker M. D. baker s. baker E. banas P. banerjee sw. banerjee D. banfi A. bangert v. bansal H. s. bansil L. barak s. P. baranov A. barbaro Galtieri 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 P. barrillon R. bartoldus A. E. barton v. bartsch R. L. bates L. batkova J. R. batley A. battaglia M. battistin F. bauer H. s. bawa s. beale T. beau P. H. b Fakultät für Mathematik und Physik Albert-Ludwigs-Universität Freiburg i.Br. 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 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 a l’Energie Atomique) Gif-sur-Yvette France INFN Sezione di Milano Italy Dipartimento di Fisica Università di Milano Milano Italy 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 School of Physics and Astronomy Queen Mary University of London London United Kingdom 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 Institut für Physik Universität Mainz Mainz Germany Department of Physics Boston University Boston Massachusetts USA Departments of Physics&Astronomy and Chemistry Stony B

Distributions sensitive to the underlying event are studied in events containing one or more charged-particle jets produced in pp collisions at s=7 Tev with the ATLAs detector at the Large Hadron Collider (LHC). These measurements reflect 800 μb−1 of data taken during 2010. Jets are reconstructed using the anti-kt algorithm with radius parameter R varying between 0.2 and 1.0. Distributions of the charged-particle multiplicity, the scalar sum of the transverse momentum of charged particles, and the average charged-particle pT are measured as functions of pTjet in regions transverse to and opposite the leading jet for 4 Gevv. In addition, the R dependence of the mean values of these observables is studied. In the transverse region, both the multiplicity and the scalar sum of the transverse momentum at fixed pTjet vary significantly with R, while the average charged-particle transverse momentum has a minimal dependence on R. Predictions from several Monte Carlo tunes have been compared to the data; the predictions from Pythia 6, based on tunes that have been determined using LHC data, show reasonable agreement with the data, including the dependence on R. Comparisons with other generators indicate that additional tuning of soft-QCD parameters is necessary for these generators. The measurements presented here provide a testing ground for further development of the Monte Carlo models.

关键词： COLLIsIONs (Nuclear physics) JETs (Nuclear physics) LARGE Hadron Collider (France & switzerland) MONTE Carlo method QUANTUM chromodynamics PARTICLEs (Nuclear physics)

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search for supersymmetry in pp collisions at s=7 Tev in final states with missing transverse momentum and b-jets with the ATLAs detector

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Physical Review D 2012年第11期85卷 112006-112006页

作者： G. Aad b. Abbott J. Abdallah s. Abdel Khalek A. A. Abdelalim A. Abdesselam O. Abdinov b. Abi M. Abolins O. s. AbouZeid H. Abramowicz H. Abreu E. Acerbi b. s. Acharya L. Adamczyk D. L. Adams T. N. Addy J. Adelman M. Aderholz s. Adomeit P. Adragna T. Adye s. Aefsky J. A. Aguilar-saavedra M. Aharrouche s. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli T. Akdogan T. P. A. Åkesson G. Akimoto A. v. Akimov A. Akiyama M. s. Alam 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 M. Aliyev b. M. M. Allbrooke P. P. Allport s. E. Allwood-spiers J. Almond A. Aloisio R. Alon A. Alonso b. Alvarez Gonzalez M. G. Alviggi K. Amako P. Amaral C. Amelung v. v. Ammosov A. Amorim G. Amorós N. Amram C. Anastopoulos L. s. Ancu N. Andari T. Andeen C. F. Anders G. Anders K. J. Anderson A. Andreazza v. Andrei M-L. Andrieux X. s. Anduaga A. Angerami F. Anghinolfi A. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli s. Aoun L. Aperio bella R. Apolle G. Arabidze I. Aracena Y. Arai A. T. H. Arce s. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armbruster O. Arnaez v. Arnal C. Arnault A. Artamonov G. Artoni D. Arutinov s. Asai R. Asfandiyarov s. Ask b. Åsman L. Asquith K. Assamagan A. Astbury A. Astvatsatourov b. Aubert E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen C. Ay G. Azuelos Y. Azuma M. A. baak G. baccaglioni C. bacci A. M. bach H. bachacou K. bachas M. backes M. backhaus E. badescu P. bagnaia s. bahinipati Y. bai D. C. bailey T. bain J. T. baines O. K. baker M. D. baker s. baker E. banas P. banerjee sw. banerjee D. banfi A. bangert v. bansal H. s. bansil L. barak s. P. baranov A. barashkou A. barbaro Galtieri 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 P. barrillon R. bartoldus A. E. barton v. bartsch R. L. ba Fakultät für Mathematik und Physik Albert-Ludwigs-Universität Freiburg i.Br. 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 Department of Physics Oxford University Oxford United Kingdom Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan 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 INFN Sezione di Milano Italy Dipartimento di Fisica Università di Milano Milano Italy 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 Max-Planck-Institut für Physik (Werner-Heisenberg-Institut) München Germany Fakultät für Physik Ludwig-Maximilians-Universität München München Germany School of Physics and Astronomy Queen Mary University of London London United Kingdom 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 Institut für Physik Universität Mainz Mainz Germany Department of Physics Boston University Boston Massachusetts USA Departments of Physics and Astronomy and Chemistry Stony Brook

The results of a search for supersymmetry in events with large missing transverse momentum and heavy-flavor jets using an integrated luminosity corresponding to 2.05 fb−1 of pp collisions at s=7 Tev recorded with the ATLAs detector at the Large Hadron Collider are reported. No significant excess is observed with respect to the prediction for standard model processes. Results are interpreted in a variety of R-parity conserving models in which scalar bottoms and tops are the only scalar quarks to appear in the gluino decay cascade, and in an sO(10) model framework. Gluino masses up to 600–900 Gev are excluded, depending on the model considered.

关键词： sUPERsYMMETRY (Physics) PREDICTION (Logic) JETs (Nuclear physics) sTANDARD model (Nuclear physics) ATOMIC mass NUCLEAR counters COLLIDERs (Nuclear physics)

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ATLAs measurements of the properties of jets for boosted particle searches

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Physical Review D 2012年第7期86卷 072006-072006页

Measurements are presented of the properties of high transverse momentum jets, produced in proton-proton collisions at a center-of-mass energy of s=7 Tev. The data correspond to an integrated luminosity of 35 pb−1 and were collected with the ATLAs detector in 2010. Jet mass, width, eccentricity, planar flow and angularity are measured for jets reconstructed using the anti-kt algorithm with distance parameters R=0.6 and 1.0, with transverse momentum pT>300 Gev and pseudorapidity |η|<2. The measurements are compared to the expectations of Monte Carlo generators that match leading-logarithmic parton showers to leading-order, or next-to-leading-order, matrix elements. The generators describe the general features of the jets, although discrepancies are observed in some distributions.

关键词： JETs (Nuclear physics) PARTICLEs (Nuclear physics) MOMENTUM (Mechanics) PROTON-proton interactions NUCLEAR counters ALGORITHMs PARTONs

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Measurement of the azimuthal anisotropy for charged particle production in sNN=2.76 Tev lead-lead collisions with the ATLAs detector

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Physical Review C 2012年第1期86卷 014907-014907页

作者： G. Aad b. Abbott J. Abdallah s. Abdel Khalek A. A. Abdelalim A. Abdesselam O. Abdinov b. Abi M. Abolins O. s. AbouZeid H. Abramowicz H. Abreu E. Acerbi b. s. Acharya L. Adamczyk D. L. Adams T. N. Addy J. Adelman M. Aderholz s. Adomeit P. Adragna T. Adye s. Aefsky J. A. Aguilar-saavedra M. Aharrouche s. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli T. Akdogan T. P. A. Åkesson G. Akimoto A. v. Akimov A. Akiyama M. s. Alam 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 M. Aliyev b. M. M. Allbrooke P. P. Allport s. E. Allwood-spiers J. Almond A. Aloisio R. Alon A. Alonso b. Alvarez Gonzalez M. G. Alviggi K. Amako P. Amaral C. Amelung v. v. Ammosov A. Amorim G. Amorós N. Amram C. Anastopoulos L. s. Ancu N. Andari T. Andeen C. F. Anders G. Anders K. J. Anderson A. Andreazza v. Andrei M-L. Andrieux X. s. Anduaga A. Angerami F. Anghinolfi A. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli s. Aoun L. Aperio bella R. Apolle G. Arabidze I. Aracena Y. Arai A. T. H. Arce s. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armbruster O. Arnaez v. Arnal C. Arnault A. Artamonov G. Artoni D. Arutinov s. Asai R. Asfandiyarov s. Ask b. Åsman L. Asquith K. Assamagan A. Astbury A. Astvatsatourov b. Aubert E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen C. Ay G. Azuelos Y. Azuma M. A. baak G. baccaglioni C. bacci A. M. bach H. bachacou K. bachas M. backes M. backhaus E. badescu P. bagnaia s. bahinipati Y. bai D. C. bailey T. bain J. T. baines O. K. baker M. D. baker s. baker E. banas P. banerjee sw. banerjee D. banfi A. bangert v. bansal H. s. bansil L. barak s. P. baranov A. barashkou A. barbaro Galtieri 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 P. barrillon R. bartoldus A. E. barton v. bartsch R. L. ba Fakultät für Mathematik und Physik Albert-Ludwigs-Universität Freiburg 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 Univ. Paris-Sud and CNRS/IN2P3 Orsay France Section de Physique Université de Genève Geneva Switzerland Department of Physics Oxford University Oxford United Kingdom Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan 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 INFN Sezione di Milano Italy Dipartimento di Fisica Università di Milano Milano Italy 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 Virgina USA Department of Physics Yale University New Haven Connecticut USA Max-Planck-Institut für Physik (Werner-Heisenberg-Institut) München Germany Fakultät für Physik Ludwig-Maximilians-Universität München München Germany School of Physics and Astronomy Queen Mary University of London London United Kingdom 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 Institut für Physik Universität Mainz Mainz Germany Department of Physics Boston University Boston Massachusetts USA Departments of Physics & Astronomy and Chemistry Stony Brook Universi

Differential measurements of charged particle azimuthal anisotropy are presented for lead-lead collisions at sNN=2.76 Tev with the ATLAs detector at the LHC, based on an integrated luminosity of approximately 8 μb−1. This anisotropy is characterized via a Fourier expansion of the distribution of charged particles in azimuthal angle relative to the reaction plane, with the coefficients vn denoting the magnitude of the anisotropy. significant v2–v6 values are obtained as a function of transverse momentum (0.5v), pseudorapidity (|η|<2.5), and centrality using an event plane method. The vn values for n≥3 are found to vary weakly with both η and centrality, and their pT dependencies are found to follow an approximate scaling relation, vn1/n(pT)∝v21/2(pT), except in the top 5% most central collisions. A Fourier analysis of the charged particle pair distribution in relative azimuthal angle (Δφ=φa−φb) is performed to extract the coefficients vn,n=〈cosnΔφ〉. For pairs of charged particles with a large pseudorapidity gap (|Δη=ηa−ηb|>2) and one particle with pT<3 Gev, the v2,2–v6,6 values are found to factorize as vn,n(pTa,pTb)≈vn(pTa)vn(pTb) in central and midcentral events. such factorization suggests that these values of v2,2–v6,6 are primarily attributable to the response of the created matter to the fluctuations in the geometry of the initial state. A detailed study shows that the v1,1(pTa,pTb) data are consistent with the combined contributions from a rapidity-even v1 and global momentum conservation. A two-component fit is used to extract the v1 contribution. The extracted v1 is observed to cross zero at pT≈1.0 Gev, reaches a maximum at 4–5 Gev with a value comparable to that for v3, and decreases at higher pT.

关键词： AZIMUTH REsEARCH ANIsOTROPY LUMINOsITY LARGE Hadron Collider (France & switzerland) NUCLEAR research

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