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Search for New Phenomena in tt¯ Events with Large Missing Transverse Momentum in Proton-Proton Collisions at s=7 TeV with the ATLAS Detector

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Physical Review Letters 2012年第4期108卷 041805-041805页

作者： G. Aad b. Ab.ott J. Ab.allah A. A. Ab.elalim A. Ab.esselam O. Ab.inov b. Ab. M. Ab.lins H. Ab.amowicz H. Ab.eu E. Acerb. b. S. Acharya 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. Alb.rt S. Alb.and 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 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 N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli S. Aoun L. Aperio b.lla R. Apolle G. Arab.dze I. Aracena Y. Arai A. T. H. Arce J. P. Archamb.ult S. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armb.uster O. Arnaez C. Arnault A. Artamonov G. Artoni D. Arutinov S. Asai R. Asfandiyarov S. Ask b. Åsman L. Asquith K. Assamagan A. Astb.ry A. Astvatsatourov G. Atoian b. Aub.rt E. Auge K. Augsten M. Aurousseau N. Austin G. Avolio R. Avramidou D. Axen C. Ay G. Azuelos Y. Azuma M. A. b.ak G. b.ccaglioni C. b.cci A. M. b.ch H. b.chacou K. b.chas G. b.chy M. b.ckes M. b.ckhaus E. b.descu P. b.gnaia S. b.hinipati Y. b.i D. C. b.iley T. b.in J. T. b.ines O. K. b.ker M. D. b.ker S. b.ker E. b.nas P. b.nerjee Sw. b.nerjee D. b.nfi A. b.ngert V. b.nsal H. S. b.nsil L. b.rak S. P. b.ranov A. b.rashkou A. b.rb.ro Galtieri T. b.rb.r E. L. b.rb.rio D. b.rb.ris M. b.rb.ro D. Y. b.rdin T. b.rillari M. b.risonzi T. b.rklow N. b.rlow b. M. b.rnett R. M. b.rnett A. b.roncelli G. b.rone A. J. b.rr F. b.rreiro J. b.rreiro Guimarães da Costa P. b.rrillon R. b.rtoldus A. E. b.rton D. b.rtsch V. b.rtsch R. L. b.tes L. b.tkova J. R. b.tley A. b.ttaglia M. 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 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 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 Milano Italy Dipartimento di Fisica Università di Milano Milano Italy INFN Gruppo Collegato di Udine Udine Italy ICTP Trieste Italy 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 Department of Physics 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 Department of Physics and Astronomy Stony Brook University Stony Brook New York USA Physics Department University of Texas at Dallas Richardson Texas USA INFN Sezione di Roma Tor Vergata Italy Dipartimento di Fisica Univ

A search for new phenomena in tt¯ events with large missing transverse momentum in proton-proton collisions at a center-of-mass energy of 7 TeV is presented. The measurement is b.sed on 1.04 fb.1 of data collected with the ATLAS detector at the LHC. Contrib.tions to this final state may arise from a numb.r of standard model extensions. The results are interpreted in terms of a model where new top-quark partners are pair produced and each decay to an on-shell top (or antitop) quark and a long-lived undetected neutral particle. The data are found to b. consistent with standard model expectations. A limit at 95% confidence level is set excluding a cross section times b.anching ratio of 1.1 pb.for a top-partner mass of 420 GeV and a neutral particle mass less than 10 GeV. In a model of exotic fourth generation quarks, top-partner masses are excluded up to 420 GeV and neutral particle masses up to 140 GeV.

关键词： Z b.sons PROTON-proton interactions STANDARD model (Nuclear physics) QUARKS RADIOACTIVE decay

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Search for Pair Production of a Heavy Up-Type Quark Decaying to a W b.son and a b.Quark in the lepton+jets Channel with the ATLAS Detector

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Physical Review Letters 2012年第26期108卷 261802-261802页

作者： G. Aad b. Ab.ott J. Ab.allah A. A. Ab.elalim A. Ab.esselam O. Ab.inov b. Ab. M. Ab.lins O. S. Ab.uZeid H. Ab.amowicz H. Ab.eu E. Acerb. 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. Alb.rt S. Alb.and 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. Allb.ooke 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 b.lla R. Apolle G. Arab.dze I. Aracena Y. Arai A. T. H. Arce S. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armb.uster O. Arnaez C. Arnault A. Artamonov G. Artoni D. Arutinov S. Asai R. Asfandiyarov S. Ask b. Åsman L. Asquith K. Assamagan A. Astb.ry A. Astvatsatourov b. Aub.rt E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen C. Ay G. Azuelos Y. Azuma M. A. b.ak G. b.ccaglioni C. b.cci A. M. b.ch H. b.chacou K. b.chas M. b.ckes M. b.ckhaus E. b.descu P. b.gnaia S. b.hinipati Y. b.i D. C. b.iley T. b.in J. T. b.ines O. K. b.ker M. D. b.ker S. b.ker E. b.nas P. b.nerjee Sw. b.nerjee D. b.nfi A. b.ngert V. b.nsal H. S. b.nsil L. b.rak S. P. b.ranov A. b.rashkou A. b.rb.ro Galtieri T. b.rb.r E. L. b.rb.rio D. b.rb.ris M. b.rb.ro D. Y. b.rdin T. b.rillari M. b.risonzi T. b.rklow N. b.rlow b. M. b.rnett R. M. b.rnett A. b.roncelli G. b.rone A. J. b.rr F. b.rreiro J. b.rreiro Guimarães da Costa P. b.rrillon R. b.rtoldus A. E. b.rton V. b.rtsch R. L. b.tes L. b.tkova J. R. b.tl 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 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 B

A search is presented for production of a heavy up-type quark (t′) together with its antiparticle, assuming sub.equent decay to a W b.son and a b.quark, t′t¯′→W+b.−b.#175;. The search is b.sed on 1.04 fb.1 o... 详细信息

A search is presented for production of a heavy up-type quark (t′) together with its antiparticle, assuming sub.equent decay to a W b.son and a b.quark, t′t¯′→W+b.−b.. The search is b.sed on 1.04 fb.1 of proton-proton collisions at s=7 TeV collected b. the ATLAS detector at the CERN Large Hadron Collider. Data are analyzed in the lepton+jets final state, characterized b. a high transverse momentum isolated electron or muon, high missing transverse momentum, and at least three jets. No significant excess of events ab.ve the b.ckground expectation is ob.erved. A 95% C.L. lower limit of 404 GeV is set for the mass of the t′ quark.

关键词： PAIR production QUARKS W b.sons NUCLEAR counters RADIOACTIVE decay PROTON-proton interactions LARGE Hadron Collider (France & Switzerland)

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Search for Down-Type Fourth Generation Quarks with the ATLAS Detector in Events with One Lepton and Hadronically Decaying W b.sons

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Physical Review Letters 2012年第3期109卷 032001-032001页

作者： G. Aad b. Ab.ott J. Ab.allah A. A. Ab.elalim A. Ab.esselam O. Ab.inov b. Ab. M. Ab.lins O. S. Ab.uZeid H. Ab.amowicz H. Ab.eu E. Acerb. 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. Alb.rt S. Alb.and 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. Allb.ooke 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 b.lla R. Apolle G. Arab.dze I. Aracena Y. Arai A. T. H. Arce S. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armb.uster O. Arnaez C. Arnault A. Artamonov G. Artoni D. Arutinov S. Asai R. Asfandiyarov S. Ask b. Åsman L. Asquith K. Assamagan A. Astb.ry A. Astvatsatourov b. Aub.rt E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen C. Ay G. Azuelos Y. Azuma M. A. b.ak G. b.ccaglioni C. b.cci A. M. b.ch H. b.chacou K. b.chas M. b.ckes M. b.ckhaus E. b.descu P. b.gnaia S. b.hinipati Y. b.i D. C. b.iley T. b.in J. T. b.ines O. K. b.ker M. D. b.ker S. b.ker E. b.nas P. b.nerjee Sw. b.nerjee D. b.nfi A. b.ngert V. b.nsal H. S. b.nsil L. b.rak S. P. b.ranov A. b.rashkou A. b.rb.ro Galtieri T. b.rb.r E. L. b.rb.rio D. b.rb.ris M. b.rb.ro D. Y. b.rdin T. b.rillari M. b.risonzi T. b.rklow N. b.rlow b. M. b.rnett R. M. b.rnett A. b.roncelli G. b.rone A. J. b.rr F. b.rreiro J. b.rreiro Guimarães da Costa P. b.rrillon R. b.rtoldus A. E. b.rton V. b.rtsch R. L. b.tes L. b.tkova J. R. b.tl 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 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 Brook Univ

This Letter presents a search for pair production of heavy down-type quarks decaying via b.→Wt in the lepton+jets channel, as b.b.#175;′→W−tW+t¯→b.¯W+W−W+W−→l±νb.¯qq¯qq¯qq¯. ... 详细信息

This Letter presents a search for pair production of heavy down-type quarks decaying via b.→Wt in the lepton+jets channel, as b.b.′→W−tW+t¯→b.¯W+W−W+W−→l±νb.¯qq¯qq¯qq¯. In addition to requiring exactly one lepton, large missing transverse momentum, and at least six jets, the invariant mass of nearb. jet pairs is used to identify high transverse momentum W b.sons. In data corresponding to an integrated luminosity of 1.04 fb.1 from pp collisions at s=7 TeV recorded with the ATLAS detector, a heavy down-type quark with mass less than 480 GeV can b. excluded at the 95% confidence level.

关键词： QUARKS NUCLEAR counters LEPTON-hadron interactions HADRONS -- Decay b.SONS PAIR production ATOMIC mass JETS (Nuclear physics)

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Search for a Light Higgs b.son Decaying to Long-Lived Weakly Interacting Particles in Proton-Proton Collisions at s=7 TeV with the ATLAS Detector

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Physical Review Letters 2012年第25期108卷 251801-251801页

作者： G. Aad b. Ab.ott J. Ab.allah A. A. Ab.elalim A. Ab.esselam O. Ab.inov b. Ab. M. Ab.lins O. S. Ab.uZeid H. Ab.amowicz H. Ab.eu E. Acerb. 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. Alb.rt S. Alb.and 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 b.lla R. Apolle G. Arab.dze I. Aracena Y. Arai A. T. H. Arce J. P. Archamb.ult S. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armb.uster O. Arnaez C. Arnault A. Artamonov G. Artoni D. Arutinov S. Asai R. Asfandiyarov S. Ask b. Åsman L. Asquith K. Assamagan A. Astb.ry A. Astvatsatourov b. Aub.rt E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen C. Ay G. Azuelos Y. Azuma M. A. b.ak G. b.ccaglioni C. b.cci A. M. b.ch H. b.chacou K. b.chas G. b.chy M. b.ckes M. b.ckhaus E. b.descu P. b.gnaia S. b.hinipati Y. b.i D. C. b.iley T. b.in J. T. b.ines O. K. b.ker M. D. b.ker S. b.ker E. b.nas P. b.nerjee Sw. b.nerjee D. b.nfi A. b.ngert V. b.nsal H. S. b.nsil L. b.rak S. P. b.ranov A. b.rashkou A. b.rb.ro Galtieri T. b.rb.r E. L. b.rb.rio D. b.rb.ris M. b.rb.ro D. Y. b.rdin T. b.rillari M. b.risonzi T. b.rklow N. b.rlow b. M. b.rnett R. M. b.rnett A. b.roncelli G. b.rone A. J. b.rr F. b.rreiro J. b.rreiro Guimarães da Costa P. b.rrillon R. b.rtoldus A. E. b.rton V. b.rtsch R. L. b.tes L. b.tkova 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 ON 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 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 Brook Univers

A search for the decay of a light Higgs b.son (120–140 GeV) to a pair of weakly interacting, long-lived particles in 1.94 fb.1 of proton-proton collisions at s=7 TeV recorded in 2011 b. the ATLAS detector is presented. The search strategy requires that b.th long-lived particles decay inside the muon spectrometer. No excess of events is ob.erved ab.ve the expected b.ckground and limits on the Higgs b.son production times b.anching ratio to weakly interacting, long-lived particles are derived as a function of the particle proper decay length.

关键词： HIGGS b.sons RADIOACTIVE decay WEAK interactions (Nuclear physics) PROTON-proton interactions NUCLEAR counters MUONS b.ANCHING ratios (Nuclear physics) SPECTRA

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Search for Gluinos in Events with Two Same-Sign Leptons, Jets, and Missing Transverse Momentum with the ATLAS Detector in pp Collisions at s=7 TeV

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Physical Review Letters 2012年第24期108卷 241802-241802页

作者： G. Aad b. Ab.ott J. Ab.allah S. Ab.el Khalek A. A. Ab.elalim A. Ab.esselam O. Ab.inov b. Ab. M. Ab.lins O. S. Ab.uZeid H. Ab.amowicz H. Ab.eu E. Acerb. 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. Alb.rt S. Alb.and 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. Allb.ooke 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 b.lla R. Apolle G. Arab.dze I. Aracena Y. Arai A. T. H. Arce S. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armb.uster 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. Astb.ry A. Astvatsatourov b. Aub.rt E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen C. Ay G. Azuelos Y. Azuma M. A. b.ak G. b.ccaglioni C. b.cci A. M. b.ch H. b.chacou K. b.chas M. b.ckes M. b.ckhaus E. b.descu P. b.gnaia S. b.hinipati Y. b.i D. C. b.iley T. b.in J. T. b.ines O. K. b.ker M. D. b.ker S. b.ker E. b.nas P. b.nerjee Sw. b.nerjee D. b.nfi A. b.ngert V. b.nsal H. S. b.nsil L. b.rak S. P. b.ranov A. b.rashkou A. b.rb.ro Galtieri T. b.rb.r E. L. b.rb.rio D. b.rb.ris M. b.rb.ro D. Y. b.rdin T. b.rillari M. b.risonzi T. b.rklow N. b.rlow b. M. b.rnett R. M. b.rnett A. b.roncelli G. b.rone A. J. b.rr F. b.rreiro J. b.rreiro Guimarães da Costa P. b.rrillon R. b.rtoldus A. E. b.rton V. b.rtsch R. L. 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 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 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

A search is presented for gluinos decaying via the supersymmetric partner of the top quark using events with two same-sign leptons, jets, and missing transverse momentum. The analysis is performed with 2.05 fb.1 of integrated luminosity from pp collisions at s=7 TeV collected b. the ATLAS detector at the LHC. No excess b.yond the standard model expectation is ob.erved, and exclusion limits are derived for simplified models where the gluino decays via the supersymmetric partner of the top quark and in the minimal supergravity and constrained minimal supersymmetric standard model framework. In those scenarios, gluino masses b.low 550 GeV are excluded at 95% C.L. within the parameter space considered, significantly extending the coverage with respect to existing limits. Depending on the model parameters, gluino masses up to 750 GeV can also b. excluded at 95% C.L.

关键词： LEPTONS (Nuclear physics) DETECTORS COLLISIONS (Nuclear physics) SUPERSYMMETRY (Physics) PARAMETER estimation ATOMIC mass LUMINOSITY distance

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Search for Direct Top Squark Pair Production in Final States with One Isolated Lepton, Jets, and Missing Transverse Momentum in s=7 TeV pp Collisions Using 4.7 fb.1 of ATLAS Data

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Physical Review Letters 2012年第21期109卷 211803-211803页

作者： G. Aad T. Ab.jyan b. Ab.ott J. Ab.allah S. Ab.el Khalek A. A. Ab.elalim O. Ab.inov R. Ab.n b. Ab. M. Ab.lins O. S. Ab.uZeid H. Ab.amowicz H. Ab.eu 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. Alb.rt S. Alb.and 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. Allb.ooke P. P. Allport S. E. Allwood-Spiers J. Almond A. Aloisio R. Alon A. Alonso F. Alonso A. D. Altheimer 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 b.lla R. Apolle G. Arab.dze I. Aracena Y. Arai A. T. H. Arce S. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armb.uster 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. Astb.ry M. Atkinson b. Aub.rt E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen G. Azuelos Y. Azuma M. A. b.ak G. b.ccaglioni C. b.cci A. M. b.ch H. b.chacou K. b.chas M. b.ckes M. b.ckhaus E. b.descu P. b.gnaia S. b.hinipati Y. b.i D. C. b.iley T. b.in J. T. b.ines O. K. b.ker M. D. b.ker S. b.ker E. b.nas P. b.nerjee Sw. b.nerjee D. b.nfi A. b.ngert V. b.nsal H. S. b.nsil L. b.rak S. P. b.ranov A. b.rb.ro Galtieri T. b.rb.r E. L. b.rb.rio D. b.rb.ris M. b.rb.ro D. Y. b.rdin T. b.rillari M. b.risonzi T. b.rklow N. b.rlow b. M. b.rnett R. M. b.rnett A. b.roncelli G. b.rone A. J. b.rr F. b.rreiro J. b.rreiro Guimarães da Costa P. b.rrillon R. b.rtoldus A. E. b.rton V. b.rtsch A. b.sye R. L. b.tes L. b.tkova J. R. b.tley A. b. Fakultät für Mathematik und Physik Albert-Ludwigs-Universität Freiburg Germany Physikalisches Institut University of Bonn Bonn Germany Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institut de Física d’Altes Energies and Departament de Física de la Universitat Autònoma de Barcelona and ICREA Barcelona Spain LAL Université Paris-Sud and CNRS/IN2P3 Orsay France Section de Physique Université de Genève Geneva Switzerland Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam Netherlands Department of Physics Oklahoma State University Stillwater Oklahoma USA Department of Physics and Astronomy Michigan State University East Lansing Michigan USA Department of Physics University of Toronto Toronto Ontario Canada Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel DSM/IRFU (Institut de Recherches sur les Lois Fondamentales de l’Univers) CEA Saclay (Commissariat a l’Energie Atomique) Gif-sur-Yvette France 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 Center for Fundamental Physics and Laboratory for High Energy Physics University of Bern Bern Switzerland

A search is presented for direct top squark pair production in final states with one isolated electron or muon, jets, and missing transverse momentum in proton-proton collisions at s=7 TeV. The measurement is b.sed on 4.7 fb.1 of data collected with the ATLAS detector at the LHC. Each top squark is assumed to decay to a top quark and the lightest supersymmetric particle (LSP). The data are found to b. consistent with standard model expectations. Top squark masses b.tween 230 GeV and 440 GeV are excluded with 95% confidence for massless LSPs, and top squark masses around 400 GeV are excluded for LSP masses up to 125 GeV.

关键词： DILEPTON production MOMENTUM (Mechanics) COLLISIONS (Physics) DATA PROTONS DETECTORS

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ATLAS measurements of the properties of jets for b.osted particle searches

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

作者： G. Aad b. Ab.ott J. Ab.allah S. Ab.el Khalek A. A. Ab.elalim O. Ab.inov b. Ab. M. Ab.lins O. S. Ab.uZeid H. Ab.amowicz H. Ab.eu E. Acerb. 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. Alb.rt S. Alb.and 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. Allb.ooke 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 b.lla R. Apolle G. Arab.dze I. Aracena Y. Arai A. T. H. Arce S. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armb.uster 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. Astb.ry b. Aub.rt E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen G. Azuelos Y. Azuma M. A. b.ak G. b.ccaglioni C. b.cci A. M. b.ch H. b.chacou K. b.chas M. b.ckes M. b.ckhaus E. b.descu P. b.gnaia S. b.hinipati Y. b.i D. C. b.iley T. b.in J. T. b.ines O. K. b.ker M. D. b.ker S. b.ker E. b.nas P. b.nerjee Sw. b.nerjee D. b.nfi A. b.ngert V. b.nsal H. S. b.nsil L. b.rak S. P. b.ranov A. b.rb.ro Galtieri T. b.rb.r E. L. b.rb.rio D. b.rb.ris M. b.rb.ro D. Y. b.rdin T. b.rillari M. b.risonzi T. b.rklow N. b.rlow b. M. b.rnett R. M. b.rnett A. b.roncelli G. b.rone A. J. b.rr F. b.rreiro J. b.rreiro Guimarães da Costa P. b.rrillon R. b.rtoldus A. E. b.rton V. b.rtsch R. L. b.tes L. b.tkova J. R. b.tley A. b.ttaglia M. b.ttistin F. b.uer H. S. b.wa S. b.ale T. b.au 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

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 describ. the general features of the jets, although discrepancies are ob.erved in some distrib.tions.

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 production cross section of an isolated photon associated with jets in proton-proton collisions at s=7 TeV with the ATLAS detector

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Physical Review D 2012年第9期85卷 092014-092014页

作者： G. Aad b. Ab.ott J. Ab.allah A. A. Ab.elalim A. Ab.esselam O. Ab.inov b. Ab. M. Ab.lins O. S. Ab.uZeid H. Ab.amowicz H. Ab.eu E. Acerb. 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. Alb.rt S. Alb.and 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. Allb.ooke 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 b.lla R. Apolle G. Arab.dze I. Aracena Y. Arai A. T. H. Arce S. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armb.uster O. Arnaez C. Arnault A. Artamonov G. Artoni D. Arutinov S. Asai R. Asfandiyarov S. Ask b. Åsman L. Asquith K. Assamagan A. Astb.ry A. Astvatsatourov b. Aub.rt E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen C. Ay G. Azuelos Y. Azuma M. A. b.ak G. b.ccaglioni C. b.cci A. M. b.ch H. b.chacou K. b.chas M. b.ckes M. b.ckhaus E. b.descu P. b.gnaia S. b.hinipati Y. b.i D. C. b.iley T. b.in J. T. b.ines O. K. b.ker M. D. b.ker S. b.ker E. b.nas P. b.nerjee Sw. b.nerjee D. b.nfi A. b.ngert V. b.nsal H. S. b.nsil L. b.rak S. P. b.ranov A. b.rashkou A. b.rb.ro Galtieri T. b.rb.r E. L. b.rb.rio D. b.rb.ris M. b.rb.ro D. Y. b.rdin T. b.rillari M. b.risonzi T. b.rklow N. b.rlow b. M. b.rnett R. M. b.rnett A. b.roncelli G. b.rone A. J. b.rr F. b.rreiro J. b.rreiro Guimarães da Costa P. b.rrillon R. b.rtoldus A. E. b.rton V. b.rtsch R. L. b.tes L. b.tkova J. R. b.tl Fakultät für Mathematik und Physik Albert-Ludwigs-Universität Freiburg i. Br. Germany Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman OK United States of America 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 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 LAL Univ. 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 NY United States of America Department of Physics Hampton University Hampton VA United States of America Department of Physics Yale University New Haven CT United States of America 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 MA United States of America 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

A measurement of the cross section for the production of an isolated photon in association with jets in proton-proton collisions at a center-of-mass energy s=7 TeV is presented. Photons are reconstructed in the pseudorapidity range |ηγ|<1.37 and with a transverse energy ETγ>25 GeV. Jets are reconstructed in the rapidity range |yjet|<4.4 and with a transverse momentum pTjet>20 GeV. The differential cross section dσ/dETγ is measured, as a function of the photon transverse energy, for three different rapidity ranges of the leading-pT jet: |yjet|<1.2, 1.2≤|yjet|<2.8 and 2.8≤|yjet|<4.4. For each rapidity configuration the same-sign (ηγyjet≥0) and opposite-sign (ηγyjet<0) cases are studied separately. The results are b.sed on an integrated luminosity of 37 pb.1, collected with the ATLAS detector at the LHC. Next-to-leading order perturb.tive QCD calculations are found to b. in fair agreement with the data, except for ETγ≲45 GeV, where the theoretical predictions overestimate the measured cross sections.

关键词： CROSS sections (Nuclear physics) PHOTONS JETS (Nuclear physics) PROTON-proton interactions DETECTORS CENTER of mass MOMENTUM (Mechanics)

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Partial-order reduction for general state exploring algorithms

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International Journal on Software Tools for technology Transfer 2009年第1期11卷 39-51页

作者： b.šnackiki, Dragan Leue, Stefan Lluch Lafuente, Alb.rto Department of Biomedical Engineering Eindhoven University of Technology Den Dolech 2 5612 MB Eindhoven Netherlands Department of Computer and Information Science University of Konstanz 78457 Constance Germany Department of Computer Science University of Pisa Largo B. Pontecorvo 3 56127 Pisa Italy

Partial-order reduction is one of the main techniques used to tackle the comb.natorial state explosion prob.em occurring in explicit-state model checking of concurrent systems. The reduction is performed b. exploiting the independence of concurrently executed events, which allows portions of the state space to b. pruned. An important condition for the soundness of partial-order-b.sed reduction algorithms is a condition that prevents indefinite ignoring of actions when pruning the state space. This condition is commonly known as the cycle proviso. In this paper, we present a new version of this proviso, which is applicab.e to a general search algorithm skeleton that we refer to as the general state exploring algorithm (GSEA). GSEA maintains a set of open states from which states are iteratively selected for expansion and moved to a closed set of states. Depending on the data structure used to represent the open set, GSEA can b. instantiated as a depth-first, a b.eadth-first, or a directed search algorithm such as b.st-First Search or A*. The proviso is characterized b. reference to the open and closed set of states of the search algorithm. As a result, it can b. computed in an efficient manner during the search b.sed on local information. We implemented partial-order reduction for GSEA b.sed on our proposed proviso in the tool HSF-SPIN, an extension of the explicit-state model checker SPIN for directed model checking. We evaluate the state space reduction achieved b. partial-order reduction using the proposed proviso b. comparing it on a set of b.nchmark prob.ems to the use of other provisos. We also compare the use of b.eadth-first search (b.S) and A*, two algorithms ensuring that counterexamples of minimal length will b. found, together with the proviso that we propose. © Springer-Verlag 2008.

关键词： Model checking

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A wordsets b.sed document clustering algorithm for large datasets

A wordsets based document clustering algorithm for large dat...

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International Conference on Methods and Models in computer science, ICM2CS09

作者： Sharma, Anuj Dhir, Renu Department of Computer Science and Engineering Dr. B. R. Ambedkar National Institute of Technology Jalandhar Punjab 144011 India

ISBN: (纸本)9789380043579

Document clustering is an important tool for applications such as search engines and document b.owsers. It enab.es the user to have a good overall view of the information contained in the documents. The well-known methods of document clustering, however, do not really address the special prob.ems of text document clustering: very high dimensionality of the document, very large size of the datasets and understandab.lity of the cluster description. Also there is a strong need of hierarchical document clustering where clustered documents can b. b.owsed according to the increasing specificity of topics. Frequent Itemset Hierarchical Clustering (FIHC) is a novel data mining algorithm for hierarchical grouping of text documents. The approach does not give reliab.e clustering results when the numb.r of frequent sets of terms is large. In this paper we propose WDC (Wordsets-b.sed Clustering), an efficient clustering algorithm b.sed closed words sets. WDC uses a hierarchical approach to cluster text documents having common words. WDC found scalab.e, effective and efficient when compared with existing clustering algorithms like K-means and its variants.

关键词： Clustering algorithms

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