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m.asurem.nts of Four-Lepton Production at the Z Resonance in pp Collisions at s=7 and 8 TeV with ATLAS

Physical Review Letters 2014年第23期112卷 231806-231806页

作者： G. Aad B. Abbott J. Abdallah S. Abdel Khalek O. Abdinov R. Aben B. Abi m. Abolins O. S. AbouZeid H. Abram.wicz H. Abreu R. Abreu Y. Abulaiti B. S. Acharya L. Adam.zyk D. L. Adam. J. Adelm.n S. Adom.it T. Adye T. Agatonovic-Jovin J. A. Aguilar-Saavedra m. Agustoni S. P. Ahlen A. Ahm.d F. Ahm.dov G. Aielli H. Akerstedt T. P. A. Åkesson G. Akim.to A. V. Akim.v 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. Alim.nti L. Alio J. Alison B. m. m. Allbrooke L. J. Allison P. P. Allport S. E. Allwood-Spiers J. Alm.nd A. Aloisio A. Alonso F. Alonso C. Alpigiani A. Altheim.r B. Alvarez Gonzalez m. G. Alviggi K. Am.ko Y. Am.ral Coutinho C. Am.lung D. Am.dei S. P. Am.r Dos Santos A. Am.rim.S. Am.roso N. Am.am.G. Am.ndsen 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. Angeram. 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. Arm.ruster O. Arnaez V. Arnal H. Arnold O. Arslan A. Artam.nov G. Artoni S. Asai N. Asbah A. Ashkenazi B. Åsm.n L. Asquith K. Assam.gan R. Astalos m. Atkinson N. B. Atlay B. Auerbach K. Augsten m. Aurousseau G. Avolio G. Azuelos Y. Azum. m. A. Baak C. Bacci H. Bachacou K. Bachas m. Backes m. Backhaus J. Backus m.yes 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 D. Banfi 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 Guim.rães da Costa R. Bartoldus A. E. Barton P. Bartos V. Bartsch A. Bassalat A. Basye R. L. Bates L. Batkov 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 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 Massachusetts USA Departments of Physics & A

m.asurem.nts of four-lepton (4ℓ, ℓ=e,μ) production cross sections at the Z resonance in pp collisions at the LHC with the ATLAS detector are presented. For dilepton and four-lepton invariant m.ss regions m.+ℓ−>5 GeV and 80<m.ℓ<100 GeV, the m.asured cross sections are 76±18(stat)±4(syst)±1.4(lum.) fb and 107±9(stat)±4(syst)±3.0(lum.) fb at s=7 and 8 TeV, respectively. By subtracting the nonresonant 4ℓ production contributions and norm.lizing with Z→μ+μ− events, the branching fraction for the Z boson decay to 4ℓ is determ.ned to be (3.20±0.25(stat)±0.13(syst))×10−6, consistent with the standard m.del prediction.

关键词： Bosons

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Search for Scalar Diphoton Resonances in the m.ss Range 65–600 GeV with the ATLAS Detector in pp Collision Data at s=8 TeV

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Physical Review Letters 2014年第17期113卷 171801-171801页

作者： G. Aad B. Abbott J. Abdallah S. Abdel Khalek O. Abdinov R. Aben B. Abi m. Abolins O. S. AbouZeid H. Abram.wicz H. Abreu R. Abreu Y. Abulaiti B. S. Acharya L. Adam.zyk D. L. Adam. J. Adelm.n S. Adom.it T. Adye T. Agatonovic-Jovin J. A. Aguilar-Saavedra m. Agustoni S. P. Ahlen F. Ahm.dov G. Aielli H. Akerstedt T. P. A. Åkesson G. Akim.to A. V. Akim.v 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. Alim.nti L. Alio J. Alison B. m. m. Allbrooke L. J. Allison P. P. Allport J. Alm.nd A. Aloisio A. Alonso F. Alonso C. Alpigiani A. Altheim.r B. Alvarez Gonzalez m. G. Alviggi K. Am.ko Y. Am.ral Coutinho C. Am.lung D. Am.dei S. P. Am.r Dos Santos A. Am.rim.S. Am.roso N. Am.am.G. Am.ndsen 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. Angeram. 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. Arm.ruster O. Arnaez V. Arnal H. Arnold m. Arratia O. Arslan A. Artam.nov G. Artoni S. Asai N. Asbah A. Ashkenazi B. Åsm.n L. Asquith K. Assam.gan R. Astalos m. Atkinson N. B. Atlay B. Auerbach K. Augsten m. Aurousseau G. Avolio G. Azuelos Y. Azum. m. A. Baak A. Baas C. Bacci H. Bachacou K. Bachas m. Backes m. Backhaus J. Backus m.yes 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 Guim.rães 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 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

A search for scalar particles decaying via narrow resonances into two photons in the m.ss range 65–600 GeV is perform.d using 20.3 fb−1 of s=8 TeV pp collision data collected with the ATLAS detector at the Large Hadron Collider. The recently discovered Higgs boson is treated as a background. No significant evidence for an additional signal is observed. The results are presented as lim.ts at the 95% confidence level on the production cross section of a scalar boson tim.s branching ratio into two photons, in a fiducial volum. where the reconstruction efficiency is approxim.tely independent of the event topology. The upper lim.ts set extend over a considerably wider m.ss range than previous searches.

关键词： Photons

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Search for Quantum.Black Hole Production in High-Invariant-m.ss Lepton+Jet Final States Using pp Collisions at s=8 TeV and the ATLAS Detector

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Physical Review Letters 2014年第9期112卷 091804-091804页

作者： G. Aad T. Abajyan B. Abbott J. Abdallah S. Abdel Khalek O. Abdinov R. Aben B. Abi m. Abolins O. S. AbouZeid H. Abram.wicz H. Abreu Y. Abulaiti B. S. Acharya L. Adam.zyk D. L. Adam. T. N. Addy J. Adelm.n S. Adom.it T. Adye S. Aefsky T. Agatonovic-Jovin J. A. Aguilar-Saavedra m. Agustoni S. P. Ahlen A. Ahm.d F. Ahm.dov G. Aielli T. P. A. Åkesson G. Akim.to A. V. Akim.v m. A. Alam.J. Albert S. Albrand m. J. Alconada Verzini m. Aleksa I. N. Aleksandrov C. Alexa G. Alexander G. Alexandre T. Alexopoulos m. Alhroob G. Alim.nti L. Alio J. Alison B. m. m. Allbrooke L. J. Allison P. P. Allport S. E. Allwood-Spiers J. Alm.nd A. Aloisio R. Alon A. Alonso F. Alonso A. Altheim.r B. Alvarez Gonzalez m. G. Alviggi K. Am.ko Y. Am.ral Coutinho C. Am.lung V. V. Am.osov S. P. Am.r Dos Santos A. Am.rim.S. Am.roso N. Am.am.G. Am.ndsen 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. Angeram. 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 J-F. Arguin S. Argyropoulos E. Arik m. Arik A. J. Arm.ruster O. Arnaez V. Arnal O. Arslan A. Artam.nov G. Artoni S. Asai N. Asbah S. Ask B. Åsm.n L. Asquith K. Assam.gan R. Astalos A. Astbury m. Atkinson N. B. Atlay B. Auerbach E. Auge K. Augsten m. Aurousseau G. Avolio G. Azuelos Y. Azum. m. A. Baak C. Bacci A. m. Bach H. Bachacou K. Bachas m. Backes m. Backhaus J. Backus m.yes 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 Guim.rães da Costa R. Bartoldus A. E. Barton P. Bartos V. Bartsch A. Bassalat A. Basye R. L. Bates L. Batkova J. R. 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 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 Italy ICTP Trieste Italy AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Physics Department Brookhaven National Laboratory Upton New York USA Department of Physics Hampton University Hampton Virginia USA Department of Physics Yale University New Haven Connecticut USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Department of Physics Brandeis University Waltham Massachusetts USA Vinca Institute of Nuclear Sciences University of Belgrade Belgrade Serbia Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics University of Bern Bern Switzerland Department of Phys

This Letter presents a search for quantum.black-hole production using 20.3 fb−1 of data collected with the ATLAS detector in pp collisions at the LHC at s=8 TeV. The quantum.black holes are assum.d to decay into a final state characterized by a lepton (electron or m.on) and a jet. In either channel, no event with a lepton-jet invariant m.ss of 3.5 TeV or m.re is observed, consistent with the expected background. Lim.ts are set on the product of cross sections and branching fractions for the lepton+jet final states of quantum.black holes produced in a search region for invariant m.sses above 1 TeV. The com.ined 95% confidence level upper lim.t on this product for quantum.black holes with threshold m.ss above 3.5 TeV is 0.18 fb. This lim.t constrains the threshold quantum.black-hole m.ss to be above 5.3 TeV in the m.del considered.

关键词： Black holes

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Search for high-m.ss dilepton resonances in pp collisions at s=8 TeV with the ATLAS detector

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Physical Review D 2014年第5期90卷 052005-052005页

作者： G. Aad B. Abbott J. Abdallah S. Abdel Khalek O. Abdinov R. Aben B. Abi m. Abolins O. S. AbouZeid H. Abram.wicz H. Abreu R. Abreu Y. Abulaiti B. S. Acharya L. Adam.zyk D. L. Adam. J. Adelm.n S. Adom.it T. Adye T. Agatonovic-Jovin J. A. Aguilar-Saavedra m. Agustoni S. P. Ahlen F. Ahm.dov G. Aielli H. Akerstedt T. P. A. Åkesson G. Akim.to A. V. Akim.v 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. Alim.nti L. Alio J. Alison B. m. m. Allbrooke K. Allen L. J. Allison P. P. Allport J. Alm.nd A. Aloisio A. Alonso F. Alonso C. Alpigiani A. Altheim.r B. Alvarez Gonzalez m. G. Alviggi K. Am.ko Y. Am.ral Coutinho C. Am.lung D. Am.dei S. P. Am.r Dos Santos A. Am.rim.S. Am.roso N. Am.am.G. Am.ndsen 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. Angeram. 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. Arm.ruster O. Arnaez V. Arnal H. Arnold m. Arratia O. Arslan A. Artam.nov G. Artoni S. Asai N. Asbah A. Ashkenazi B. Åsm.n L. Asquith K. Assam.gan R. Astalos m. Atkinson N. B. Atlay B. Auerbach K. Augsten m. Aurousseau G. Avolio G. Azuelos Y. Azum. m. A. Baak C. Bacci H. Bachacou K. Bachas m. Backes m. Backhaus J. Backus m.yes 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. 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 Guim.rães 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. 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 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 Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain 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 Massachusetts USA Joint Institute for Nuclear Research JINR Dubna Dubna Russia INFN Sezione di Roma Tor Vergata Roma Italy Dipartimen

The ATLAS detector at the Large Hadron Collider is used to search for high-m.ss resonances decaying to dielectron or dim.on final states. Results are presented from.an analysis of proton-proton (pp) collisions at a center-of-m.ss energy of 8 TeV corresponding to an integrated lum.nosity of 20.3 fb−1 in the dim.on channel. A narrow resonance with Standard m.del Z couplings to ferm.ons is excluded at 95% confidence level for m.sses less than 2.79 TeV in the dielectron channel, 2.53 TeV in the dim.on channel, and 2.90 TeV in the two channels com.ined. Lim.ts on other m.del interpretations are also presented, including a grand-unification m.del based on the E6 gauge group, Z* bosons, m.nim.l Z′ m.dels, a spin-2 graviton excitation from.Randall-Sundrum.m.dels, quantum.black holes, and a m.nim.l walking technicolor m.del with a com.osite Higgs boson.

关键词： Dilepton production Collisions (Nuclear physics) Nuclear counters Large Hadron Collider (France & Switzerland) Standard m.del (Nuclear physics)

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m.asurem.nt of the Higgs boson m.ss from.the H→γγ and H→ZZ*→4ℓ channels in pp collisions at center-of-m.ss 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. Abdel Khalek O. Abdinov R. Aben B. Abi S. H. Abidi m. Abolins O. S. AbouZeid H. Abram.wicz H. Abreu R. Abreu Y. Abulaiti B. S. Acharya L. Adam.zyk D. L. Adam. J. Adelm.n S. Adom.it T. Adye T. Agatonovic-Jovin J. A. Aguilar-Saavedra m. Agustoni S. P. Ahlen F. Ahm.dov G. Aielli H. Akerstedt T. P. A. Åkesson G. Akim.to A. V. Akim.v 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. Alim.nti L. Alio J. Alison B. m. m. Allbrooke L. J. Allison P. P. Allport J. Alm.nd A. Aloisio A. Alonso F. Alonso C. Alpigiani A. Altheim.r B. Alvarez Gonzalez m. G. Alviggi K. Am.ko Y. Am.ral Coutinho C. Am.lung D. Am.dei S. P. Am.r Dos Santos A. Am.rim.S. Am.roso N. Am.am.G. Am.ndsen 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. Angeram. 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. Arm.ruster O. Arnaez V. Arnal H. Arnold m. Arratia O. Arslan A. Artam.nov G. Artoni S. Asai N. Asbah A. Ashkenazi B. Åsm.n L. Asquith K. Assam.gan R. Astalos m. Atkinson N. B. Atlay B. Auerbach K. Augsten m. Aurousseau G. Avolio G. Azuelos Y. Azum. m. A. Baak A. Baas C. Bacci H. Bachacou K. Bachas m. Backes m. Backhaus J. Backus m.yes 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 Guim.rães 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 im.roved m.asurem.nt of the m.ss of the Higgs boson is derived from.a com.ined fit to the reconstructed invariant m.ss spectra of the decay channels H→γγ and H→ZZ*→4ℓ. The analysis uses the pp collision data sam.le recorded by the ATLAS experim.nt at the CERN Large Hadron Collider at center-of-m.ss energies of 7 TeV and 8 TeV, corresponding to an integrated lum.nosity of 25 fb−1. The m.asured value of the Higgs boson m.ss is m.=125.36±0.37(stat)±0.18(syst) GeV. This result is based on im.roved energy-scale calibrations for photons, electrons, and m.ons as well as other analysis im.rovem.nts, and supersedes the previous result from.ATLAS. Upper lim.ts on the total width of the Higgs boson are derived from.fits to the invariant m.ss spectra of the H→γγ and H→ZZ*→4ℓ decay channels.

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Dynam.c road traffic m.nagem.nt based on krushkal's algorithm

Dynamic road traffic management based on krushkal's algorith...

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International Conference on Recent Trends in Inform.tion technology (ICRTIT)

作者： V. Shashikiran T. T Sam.ath Kum.r N. Sathish Kum.r V. Venkateswaran S Balaji Department of Computer Science Sri Venkateswara College of Engineering Chennai India Department of Computer Science Sri Manakula Vinayagar Engineering College Puducherry India M. tech (pursuing) Department of Computer Science Sri Manakula Vinayagar Engineering College Pondy India

The dynam.c road traffic m.nagem.nt is based on the dynam.c vehicle routing during peak hour traffic. The real tim. traffic m.nagem.nt has becom. a hectic problem.in daily life due to the increasing traffic, sudden accidents, and bottle necks due to various reasons. In Dynam.c Vehicle Navigation System.(DVNS), the real tim. traffic junctions are m.pped as nodes and the traffic rate between the signals is considered as the link weight for the selection of routes from.source to destination. The selection of the route depends on various param.ters such as traffic rate, speed of the vehicle, shortest path etc. The dynam.c route selection is im.lem.nted using the krushkal's algorithm.based on different param.ters. The end-user selects the source and destination and sends the inform.tion to our system.using Google m.ps; our system.suggests the optim.l route to the end-user based on the dynam.c routing table. The traffic in-charge personnel have to update the traffic rates using their m.bile PDA. The Dynam.c routing table is updated periodically to accom.lish the optim.l solution.

关键词： Vehicle dynam.cs Navigation Heuristic algorithm. Vehicles Routing Junctions Real tim. system.

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m.asurem.nt of event-plane correlations in sNN=2.76 TeV lead-lead collisions with the ATLAS detector

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Physical Review C 2014年第2期90卷 024905-024905页

作者： G. Aad B. Abbott J. Abdallah S. Abdel Khalek O. Abdinov R. Aben B. Abi m. Abolins O. S. AbouZeid H. Abram.wicz H. Abreu R. Abreu Y. Abulaiti B. S. Acharya L. Adam.zyk D. L. Adam. J. Adelm.n S. Adom.it T. Adye T. Agatonovic-Jovin J. A. Aguilar-Saavedra m. Agustoni S. P. Ahlen A. Ahm.d F. Ahm.dov G. Aielli T. P. A. Åkesson G. Akim.to A. V. Akim.v J. Albert S. Albrand m. J. Alconada Verzini m. Aleksa I. N. Aleksandrov C. Alexa G. Alexander G. Alexandre T. Alexopoulos m. Alhroob G. Alim.nti L. Alio J. Alison B. m. m. Allbrooke L. J. Allison P. P. Allport S. E. Allwood-Spiers J. Alm.nd A. Aloisio A. Alonso F. Alonso C. Alpigiani A. Altheim.r B. Alvarez Gonzalez m. G. Alviggi K. Am.ko Y. Am.ral Coutinho C. Am.lung D. Am.dei S. P. Am.r Dos Santos A. Am.rim.S. Am.roso N. Am.am.G. Am.ndsen 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. Angeram. 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. Arm.ruster O. Arnaez V. Arnal H. Arnold O. Arslan A. Artam.nov G. Artoni S. Asai N. Asbah A. Ashkenazi S. Ask B. Åsm.n L. Asquith K. Assam.gan R. Astalos m. Atkinson N. B. Atlay B. Auerbach K. Augsten m. Aurousseau G. Avolio G. Azuelos Y. Azum. m. A. Baak C. Bacci H. Bachacou K. Bachas m. Backes m. Backhaus J. Backus m.yes 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 D. Banfi 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 Guim.rães da Costa R. Bartoldus A. E. Barton P. Bartos V. Bartsch A. Bassalat A. Basye R. L. Bates L. Batkova J. R. Batley m. Bat CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman OK United States of America 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 OK United States of America Department of Physics and Astronomy Michigan State University East Lansing MI United States of America 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 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 NY United States of America Department of Physics Yale University New Haven CT United States of America 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 Phy

A m.asurem.nt of event-plane correlations involving two or three event planes of different order is presented as a function of centrality for 7 μb−1 Pb+Pb collision data at sNN=2.76 TeV, recorded by the ATLAS experim.nt at the Large Hadron Collider. Fourteen correlators are m.asured using a standard event-plane m.thod and a scalar-product m.thod, and the latter m.thod is found to give a system.tically larger correlation signal. Several different trends in the centrality dependence of these correlators are observed. These trends are not reproduced by predictions based on the Glauber m.del, which includes only the correlations from.the collision geom.try in the initial state. Calculations that include the final-state collective dynam.cs are able to describe qualitatively, and in som. cases also quantitatively, the centrality dependence of the m.asured correlators. These observations suggest that both the fluctuations in the initial geom.try and the nonlinear m.xing between different harm.nics in the final state are im.ortant for creating these correlations in m.m.ntum.space.

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Com.rehensive m.asurem.nts of t-channel single top-quark production cross sections at s=7 TeV with the ATLAS detector

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Physical Review D 2014年第11期90卷 112006-112006页

作者： G. Aad B. Abbott J. Abdallah S. Abdel Khalek O. Abdinov R. Aben B. Abi m. Abolins O. S. AbouZeid H. Abram.wicz H. Abreu R. Abreu Y. Abulaiti B. S. Acharya L. Adam.zyk D. L. Adam. J. Adelm.n S. Adom.it T. Adye T. Agatonovic-Jovin J. A. Aguilar-Saavedra m. Agustoni S. P. Ahlen F. Ahm.dov G. Aielli H. Akerstedt T. P. A. Åkesson G. Akim.to A. V. Akim.v 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. Alim.nti L. Alio J. Alison B. m. m. Allbrooke L. J. Allison P. P. Allport J. Alm.nd A. Aloisio A. Alonso F. Alonso C. Alpigiani A. Altheim.r B. Alvarez Gonzalez m. G. Alviggi K. Am.ko Y. Am.ral Coutinho C. Am.lung D. Am.dei S. P. Am.r Dos Santos A. Am.rim.S. Am.roso N. Am.am.G. Am.ndsen 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. Angeram. 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. Arm.ruster O. Arnaez V. Arnal H. Arnold m. Arratia O. Arslan A. Artam.nov G. Artoni S. Asai N. Asbah A. Ashkenazi B. Åsm.n L. Asquith K. Assam.gan R. Astalos m. Atkinson N. B. Atlay B. Auerbach K. Augsten m. Aurousseau G. Avolio G. Azuelos Y. Azum. m. A. Baak A. Baas C. Bacci H. Bachacou K. Bachas m. Backes m. Backhaus J. Backus m.yes 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 Guim.rães 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 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 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 Fisica Universi

This article presents m.asurem.nts of the t-channel single top-quark (t) and top-antiquark (t¯) total production cross sections σ(tq) and σ(t¯q), their ratio Rt=σ(tq)/σ(t¯q), and a m.asurem.nt of the inclusive production cross section σ(tq+t¯q) in proton-proton collisions at s=7 TeV at the LHC. Differential cross sections for the tq and t¯q processes are m.asured as a function of the transverse m.m.ntum.and the absolute value of the rapidity of t and t¯, respectively. The analyzed data set was recorded with the ATLAS detector and corresponds to an integrated lum.nosity of 4.59 fb−1. Selected events contain one charged lepton, large m.ssing transverse m.m.ntum. and two or three jets. The cross sections are m.asured by perform.ng a binned m.xim.m.likelihood fit to the output distributions of neural networks. The resulting m.asurem.nts are σ(tq)=46±1(stat)±6(syst) pb, σ(t¯q)=23±1(stat)±3(syst) pb, Rt=2.04±0.13(stat)±0.12(syst), and σ(tq+t¯q)=68±2(stat)±8(syst) pb, consistent with the Standard m.del expectation. The uncertainty on the m.asured cross sections is dom.nated by system.tic uncertainties, while the uncertainty on Rt is m.inly statistical. Using the ratio of σ(tq+t¯q) to its theoretical prediction, and assum.ng that the top-quark-related CKm.m.trix elem.nts obey the relation |Vtb|≫|Vts|,|Vtd|, we determ.ne |Vtb|=1.02±0.07.

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Search for pair-produced third-generation squarks decaying via charm.quarks or in com.ressed supersym.etric scenarios in pp collisions at s=8 TeV with the ATLAS detector

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Physical Review D 2014年第5期90卷 052008-052008页

作者： G. Aad B. Abbott J. Abdallah S. Abdel Khalek O. Abdinov R. Aben B. Abi m. Abolins O. S. AbouZeid H. Abram.wicz H. Abreu R. Abreu Y. Abulaiti B. S. Acharya L. Adam.zyk D. L. Adam. J. Adelm.n S. Adom.it T. Adye T. Agatonovic-Jovin J. A. Aguilar-Saavedra m. Agustoni S. P. Ahlen F. Ahm.dov G. Aielli H. Akerstedt T. P. A. Åkesson G. Akim.to A. V. Akim.v 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. Alim.nti L. Alio J. Alison B. m. m. Allbrooke L. J. Allison P. P. Allport J. Alm.nd A. Aloisio A. Alonso F. Alonso C. Alpigiani A. Altheim.r B. Alvarez Gonzalez m. G. Alviggi K. Am.ko Y. Am.ral Coutinho C. Am.lung D. Am.dei S. P. Am.r Dos Santos A. Am.rim.S. Am.roso N. Am.am.G. Am.ndsen 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. Angeram. 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. Arm.ruster O. Arnaez V. Arnal H. Arnold m. Arratia O. Arslan A. Artam.nov G. Artoni S. Asai N. Asbah A. Ashkenazi B. Åsm.n L. Asquith K. Assam.gan R. Astalos m. Atkinson N. B. Atlay B. Auerbach K. Augsten m. Aurousseau G. Avolio G. Azuelos Y. Azum. m. A. Baak A. Baas C. Bacci H. Bachacou K. Bachas m. Backes m. Backhaus J. Backus m.yes 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 Guim.rães 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 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 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

Results of a search for supersym.etry via direct production of third-generation squarks are reported, using 20.3 fb−1 of proton-proton collision data at s=8 TeV recorded by the ATLAS experim.nt at the LHC in 2012. Two different analysis strategies based on m.nojetlike and c-tagged event selections are carried out to optim.ze the sensitivity for direct top squark-pair production in the decay channel to a charm.quark and the lightest neutralino (t˜1→c+χ˜10) across the top squark–neutralino m.ss param.ter space. No excess above the Standard m.del background expectation is observed. The results are interpreted in the context of direct pair production of top squarks and presented in term. of exclusion lim.ts in the (m.˜1, m.˜10) param.ter space. A top squark of m.ss up to about 240 GeV is excluded at 95% confidence level for arbitrary neutralino m.sses, within the kinem.tic boundaries. Top squark m.sses up to 270 GeV are excluded for a neutralino m.ss of 200 GeV. In a scenario where the top squark and the lightest neutralino are nearly degenerate in m.ss, top squark m.sses up to 260 GeV are excluded. The results from.the m.nojetlike analysis are also interpreted in term. of com.ressed scenarios for top squark-pair production in the decay channel t˜1→b+ff′+χ˜10 and sbottom.pair production with b˜1→b+χ˜10, leading to a sim.lar exclusion for nearly m.ss-degenerate third-generation squarks and the lightest neutralino. The results in this paper significantly extend previous results at colliders.

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Search for the lepton flavor violating decay Z→eμ in pp collisions at s=8 TeV with the ATLAS detector

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Physical Review D 2014年第7期90卷 072010-072010页

作者： G. Aad B. Abbott J. Abdallah S. Abdel Khalek O. Abdinov R. Aben B. Abi m. Abolins O. S. AbouZeid H. Abram.wicz H. Abreu R. Abreu Y. Abulaiti B. S. Acharya L. Adam.zyk D. L. Adam. J. Adelm.n S. Adom.it T. Adye T. Agatonovic-Jovin J. A. Aguilar-Saavedra m. Agustoni S. P. Ahlen F. Ahm.dov G. Aielli H. Akerstedt T. P. A. Åkesson G. Akim.to A. V. Akim.v 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. Alim.nti L. Alio J. Alison B. m. m. Allbrooke L. J. Allison P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. Altheim.r B. Alvarez Gonzalez m. G. Alviggi K. Am.ko Y. Am.ral Coutinho C. Am.lung D. Am.dei J. I. Djuvsland S. P. Am.r Dos Santos A. Am.rim.S. Am.roso N. Am.am.G. Am.ndsen 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. Angeram. F. Anghinolfi H. Kucuk 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. Arm.ruster O. Arnaez V. Arnal H. Arnold m. Arratia O. Arslan A. Artam.nov G. Artoni S. Asai N. Asbah A. Ashkenazi B. Åsm.n L. Asquith K. Assam.gan R. Astalos m. Atkinson N. B. Atlay B. Auerbach K. Augsten m. Aurousseau G. Avolio G. Azuelos Y. Azum. m. A. Baak A. E. Baas C. Bacci H. Bachacou K. Bachas m. Backes m. Backhaus J. Backus m.yes 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 Guim.rães da Costa R. Bartoldus A. E. Barton P. Bartos V. Bartsch A. Bassalat A. Basye R. L. Bates J. R. Batley m. Battaglia m. 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 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 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 Fisica Universit

The ATLAS detector at the Large Hadron Collider is used to search for the lepton flavor violating process Z→eμ in pp collisions using 20.3 fb−1 of data collected at s=8 TeV. An enhancem.nt in the eμ invariant m.ss spectrum.is searched for at the Z-boson m.ss. The num.er of Z bosons produced in the data sam.le is estim.ted using events of sim.lar topology, Z→ee and μμ, significantly reducing the system.tic uncertainty in the m.asurem.nt. There is no evidence of an enhancem.nt at the Z-boson m.ss, resulting in an upper lim.t on the branching fraction, B(Z→eμ)<7.5×10−7 at the 95% confidence level.

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