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search for the standard Model Higgs Boson in the Diphoton Decay Channel with 4.9 fb−1 of pp Collision Data at s=7 teV with AtLAs

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Physical Review Letters 2012年第11期108卷 111803-111803页

作者： G. Aad B. Abbott J. Abdallah s. Abdel Khalek A. A. Abdelalim A. Abdesselam O. Abdinov B. Abi M. Abolins O. s. AbouZeid H. Abramowicz H. Abreu E. Acerbi B. s. Acharya L. Adamczyk D. L. Adams t. N. Addy J. Adelman M. Aderholz s. Adomeit P. Adragna t. Adye s. Aefsky J. A. Aguilar-saavedra M. Aharrouche s. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli t. Akdogan t. P. A. Åkesson G. Akimoto A. V. Akimov A. Akiyama M. s. Alam M. A. Alam J. Albert s. Albrand M. Aleksa i. N. Aleksandrov F. Alessandria C. Alexa G. Alexander G. Alexandre t. Alexopoulos M. Alhroob M. Aliev G. Alimonti J. Alison M. Aliyev B. M. M. Allbrooke P. P. Allport s. E. Allwood-spiers J. Almond A. Aloisio R. Alon A. Alonso B. Alvarez Gonzalez M. G. Alviggi K. Amako P. Amaral C. Amelung V. V. Ammosov A. Amorim G. Amorós N. Amram C. Anastopoulos L. s. Ancu N. Andari t. Andeen C. F. Anders G. Anders K. J. Anderson A. Andreazza V. Andrei M-L. Andrieux X. s. Anduaga A. Angerami F. Anghinolfi A. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli s. Aoun L. Aperio Bella R. Apolle G. Arabidze i. Aracena Y. Arai A. t. H. Arce s. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armbruster O. Arnaez V. Arnal C. Arnault A. Artamonov G. Artoni D. Arutinov s. Asai R. Asfandiyarov s. Ask B. Åsman L. Asquith K. Assamagan A. Astbury A. Astvatsatourov B. Aubert E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen C. Ay G. Azuelos Y. Azuma M. A. Baak G. Baccaglioni C. Bacci A. M. Bach H. Bachacou K. Bachas M. Backes M. Backhaus E. Badescu P. Bagnaia s. Bahinipati Y. Bai D. C. Bailey t. Bain J. t. Baines O. K. Baker M. D. Baker s. Baker E. Banas P. Banerjee sw. Banerjee D. Banfi A. Bangert V. Bansal H. s. Bansil L. Barak s. P. Baranov A. Barashkou A. Barbaro Galtieri t. Barber E. L. Barberio D. Barberis M. Barbero D. Y. Bardin t. Barillari M. Barisonzi t. Barklow N. Barlow B. M. Barnett R. M. Barnett A. Baroncelli G. Barone A. J. Barr F. Barreiro J. Barreiro Guimarães da Costa P. Barrillon R. Bartoldus A. E. Barton V. Bartsch R. L. Ba Fakultät für Mathematik und Physik Albert-Ludwigs-Universität Freiburg i.Br. Germany Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institut de Física d’Altes Energies and Departament de Física de la Universitat Autònoma de Barcelona and ICREA Barcelona Spain LAL Université Paris-Sud and CNRS/IN2P3 Orsay France Section de Physique Université de Genève Geneva Switzerland Department of Physics Oxford University Oxford United Kingdom Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Department of Physics Oklahoma State University Stillwater Oklahoma USA Department of Physics and Astronomy Michigan State University East Lansing Michigan USA Department of Physics University of Toronto Toronto ON Canada Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel INFN Sezione di Milano Italy Dipartimento di Fisica Università di Milano Milano Italy INFN Gruppo Collegato di Udine Italy ICTP Trieste Italy Faculty of Physics and Applied Computer Science AGH University of Science and Technology Krakow Poland Physics Department Brookhaven National Laboratory Upton New York USA Department of Physics 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 Uni

A search for the standard model Higgs boson is performed in the diphoton decay channel. the data used correspond to an integrated luminosity of 4.9 fb−1 collected with the AtLAs detector at the Large Hadron Collider in proton-proton collisions at a center-of-mass energy of s=7 teV. in the diphoton mass range 110–150 GeV, the largest excess with respect to the background-only hypothesis is observed at 126.5 GeV, with a local significance of 2.8 standard deviations. taking the look-elsewhere effect into account in the range 110–150 GeV, this significance becomes 1.5 standard deviations. the standard model Higgs boson is excluded at 95% confidence level in the mass ranges of 113–115 GeV and 134.5–136 GeV.

关键词： statistics

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search for tb Resonances in Proton-Proton Collisions at s=7 teV with the AtLAs Detector

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Physical Review Letters 2012年第8期109卷 081801-081801页

作者： G. Aad B. Abbott J. Abdallah s. Abdel Khalek A. A. Abdelalim A. Abdesselam O. Abdinov B. Abi M. Abolins O. s. AbouZeid H. Abramowicz H. Abreu E. Acerbi B. s. Acharya L. Adamczyk D. L. Adams t. N. Addy J. Adelman M. Aderholz s. Adomeit P. Adragna t. Adye s. Aefsky J. A. Aguilar-saavedra M. Aharrouche s. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli t. Akdogan t. P. A. Åkesson G. Akimoto A. V. Akimov A. Akiyama M. s. Alam M. A. Alam J. Albert s. Albrand M. Aleksa i. N. Aleksandrov F. Alessandria C. Alexa G. Alexander G. Alexandre t. Alexopoulos M. Alhroob M. Aliev G. Alimonti J. Alison M. Aliyev B. M. M. Allbrooke P. P. Allport s. E. Allwood-spiers J. Almond A. Aloisio R. Alon A. Alonso B. Alvarez Gonzalez M. G. Alviggi K. Amako P. Amaral C. Amelung V. V. Ammosov A. Amorim G. Amorós N. Amram C. Anastopoulos L. s. Ancu N. Andari t. Andeen C. F. Anders G. Anders K. J. Anderson A. Andreazza V. Andrei M-L. Andrieux X. s. Anduaga A. Angerami F. Anghinolfi A. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli s. Aoun L. Aperio Bella R. Apolle G. Arabidze i. Aracena Y. Arai A. t. H. Arce s. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armbruster O. Arnaez V. Arnal C. Arnault A. Artamonov G. Artoni D. Arutinov s. Asai R. Asfandiyarov s. Ask B. Åsman L. Asquith K. Assamagan A. Astbury B. Aubert E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen C. Ay G. Azuelos Y. Azuma M. A. Baak G. Baccaglioni C. Bacci A. M. Bach H. Bachacou K. Bachas M. Backes M. Backhaus E. Badescu P. Bagnaia s. Bahinipati Y. Bai D. C. Bailey t. Bain J. t. Baines O. K. Baker M. D. Baker s. Baker E. Banas P. Banerjee sw. Banerjee D. Banfi A. Bangert V. Bansal H. s. Bansil L. Barak s. P. Baranov A. Barashkou A. Barbaro Galtieri t. Barber E. L. Barberio D. Barberis M. Barbero D. Y. Bardin t. Barillari M. Barisonzi t. Barklow N. Barlow B. M. Barnett R. M. Barnett A. Baroncelli G. Barone A. J. Barr F. Barreiro J. Barreiro Guimarães da Costa P. Barrillon R. Bartoldus A. E. Barton V. Bartsch R. L. Bates L. Batkova J. Fakultät für Mathematik und Physik Albert-Ludwigs-Universität Freiburg 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 United States of America USA Department of Physics University of Toronto Toronto Ontario Canada Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel DSM/IRFU (Institut de Recherches sur les Lois Fondamentales de l’Univers) CEA Saclay (Commissariat a l’Energie Atomique) Gif-sur-Yvette France INFN Sezione di Milano Italy Dipartimento di Fisica Università di Milano Milano Italy INFN Gruppo Collegato di Udine Italy ICTP Trieste Italy AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Physics Department Brookhaven National Laboratory Upton New York USA Department of Physics Hampton University Hampton Virginia USA Department of Physics Yale University New Haven Connecticut USA Max-Planck-Institut für Physik (Werner-Heisenberg-Institut) München Germany Fakultät für Physik Ludwig-Maximilians-Universität München München Germany School of Physics and Astronomy Queen Mary University of London London United Kingdom Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Department of Physics Brandeis University Waltham Massachusetts USA Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain Institut für Physik Un

this Letter presents a search for tb resonances in 1.04 fb−1 of LHC proton-proton collision data collected by the AtLAs detector at a center-of-mass energy of 7 teV. Events with a lepton, missing transverse momentum, and two jets are selected and the invariant mass of the corresponding final state is reconstructed. the search exploits the shape of the tb invariant mass distribution compared to the expected standard model backgrounds. the model of a right-handed WR′ with standard model-like couplings is chosen as the benchmark model for this search. No statistically significant excess of events is observed in the data, and upper limits on the cross section times the branching ratio of WR′ resonances at 95% C.L. lie in the range of 6.1–1.0 pb for WR′ masses ranging from 0.5 to 2.0 teV. these limits are translated into a lower bound on the allowed right-handed WR′ mass, giving mWR′>1.13 teV at 95% C.L.

关键词： Resonance

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search for supersymmetry in Events with three Leptons and Missing transverse Momentum in s=7 teV pp Collisions with the AtLAs Detector

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Physical Review Letters 2012年第26期108卷 261804-261804页

作者： G. Aad B. Abbott J. Abdallah s. Abdel Khalek A. A. Abdelalim O. Abdinov B. Abi M. Abolins O. s. AbouZeid H. Abramowicz H. Abreu E. Acerbi B. s. Acharya L. Adamczyk D. L. Adams t. N. Addy J. Adelman s. Adomeit P. Adragna t. Adye s. Aefsky J. A. Aguilar-saavedra M. Aharrouche s. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli t. Akdogan t. P. A. Åkesson G. Akimoto A. V. Akimov A. Akiyama M. s. Alam M. A. Alam J. Albert s. Albrand M. Aleksa i. N. Aleksandrov F. Alessandria C. Alexa G. Alexander G. Alexandre t. Alexopoulos M. Alhroob M. Aliev G. Alimonti J. Alison B. M. M. Allbrooke P. P. Allport s. E. Allwood-spiers J. Almond A. Aloisio R. Alon A. Alonso B. Alvarez Gonzalez M. G. Alviggi K. Amako C. Amelung V. V. Ammosov A. Amorim 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 X. s. Anduaga A. Angerami F. Anghinolfi A. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli s. Aoun L. Aperio Bella R. Apolle G. Arabidze i. Aracena Y. Arai A. t. H. Arce s. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armbruster O. Arnaez V. Arnal C. Arnault A. Artamonov G. Artoni D. Arutinov s. Asai R. Asfandiyarov s. Ask B. Åsman L. Asquith K. Assamagan A. Astbury B. Aubert E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen G. Azuelos Y. Azuma M. A. Baak G. Baccaglioni C. Bacci A. M. Bach H. Bachacou K. Bachas M. Backes M. Backhaus E. Badescu P. Bagnaia s. Bahinipati Y. Bai D. C. Bailey t. Bain J. t. Baines O. K. Baker M. D. Baker s. Baker E. Banas P. Banerjee sw. Banerjee D. Banfi A. Bangert V. Bansal H. s. Bansil L. Barak s. P. Baranov A. Barbaro Galtieri t. Barber E. L. Barberio D. Barberis M. Barbero D. Y. Bardin t. Barillari M. Barisonzi t. Barklow N. Barlow B. M. Barnett R. M. Barnett A. Baroncelli G. Barone A. J. Barr F. Barreiro J. Barreiro Guimarães da Costa P. Barrillon R. Bartoldus A. E. Barton V. Bartsch R. L. Bates L. Batkova J. R. Batley A. Battaglia M. Battistin F. Bauer H. s. Bawa s. Beale t. Beau P. H. 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 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 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 Brook University

A search for the weak production of charginos and neutralinos decaying to a final state with three leptons (electrons or muons) and missing transverse momentum is presented. the analysis uses 2.06 fb−1 of s=7 teV proton-proton collision data delivered by the Large Hadron Collider and recorded with the AtLAs detector. Observations are consistent with standard model expectations in two signal regions that are either depleted or enriched in Z-boson decays. Upper limits at 95% confidence level are set in R-parity conserving phenomenological minimal supersymmetric and simplified models. For the simplified models, degenerate lightest chargino and next-to-lightest neutralino masses up to 300 GeV are excluded for mass differences from the lightest neutralino up to 300 GeV.

关键词： supersymmetry

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search for the Higgs Boson in the H→WW(*)→l+νl−ν¯ Decay Channel in pp Collisions at s=7 teV with the AtLAs Detector

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Physical Review Letters 2012年第11期108卷 111802-111802页

作者： G. Aad B. Abbott J. Abdallah A. A. Abdelalim A. Abdesselam O. Abdinov B. Abi M. Abolins H. Abramowicz H. Abreu E. Acerbi B. s. Acharya L. Adamczyk D. L. Adams t. N. Addy J. Adelman M. Aderholz s. Adomeit P. Adragna t. Adye s. Aefsky J. A. Aguilar-saavedra M. Aharrouche s. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli t. Akdogan t. P. A. Åkesson G. Akimoto A. V. Akimov A. Akiyama M. s. Alam M. A. Alam J. Albert s. Albrand M. Aleksa i. N. Aleksandrov F. Alessandria C. Alexa G. Alexander G. Alexandre t. Alexopoulos M. Alhroob M. Aliev G. Alimonti J. Alison M. Aliyev P. P. Allport s. E. Allwood-spiers J. Almond A. Aloisio R. Alon A. Alonso B. Alvarez Gonzalez M. G. Alviggi K. Amako P. Amaral C. Amelung V. V. Ammosov A. Amorim G. Amorós N. Amram C. Anastopoulos L. s. Ancu N. Andari t. Andeen C. F. Anders G. Anders K. J. Anderson A. Andreazza V. Andrei M-L. Andrieux X. s. Anduaga A. Angerami F. Anghinolfi A. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli s. Aoun L. Aperio Bella R. Apolle G. Arabidze i. Aracena Y. Arai A. t. H. Arce J. P. Archambault s. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armbruster O. Arnaez C. Arnault A. Artamonov G. Artoni D. Arutinov s. Asai R. Asfandiyarov s. Ask B. Åsman L. Asquith K. Assamagan A. Astbury A. Astvatsatourov B. Aubert E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen C. Ay G. Azuelos Y. Azuma M. A. Baak G. Baccaglioni C. Bacci A. M. Bach H. Bachacou K. Bachas G. Bachy M. Backes M. Backhaus E. Badescu P. Bagnaia s. Bahinipati Y. Bai D. C. Bailey t. Bain J. t. Baines O. K. Baker M. D. Baker s. Baker E. Banas P. Banerjee sw. Banerjee D. Banfi A. Bangert V. Bansal H. s. Bansil L. Barak s. P. Baranov A. Barashkou A. Barbaro Galtieri t. Barber E. L. Barberio D. Barberis M. Barbero D. Y. Bardin t. Barillari M. Barisonzi t. Barklow N. Barlow B. M. Barnett R. M. Barnett A. Baroncelli G. Barone A. J. Barr F. Barreiro J. Barreiro Guimarães da Costa P. Barrillon R. Bartoldus A. E. Barton V. Bartsch R. L. Bates L. Batkova J. R. Batley A. B Fakultät für Mathematik und Physik Albert-Ludwigs-Universität Freiburg im Breisgau 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 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 Faculty of Physics and Applied Computer Science AGH-University of Science and Technology Krakow Poland Physics Department Brookhaven National Laboratory Upton New York USA Department of Physics 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 Department of Physics and Astronomy Stony Brook University Stony Brook New York USA Physics Department University of Texas

A search for the Higgs boson has been performed in the H→WW(*)→ℓ+νℓ−ν¯ channel (ℓ=e/μ) with an integrated luminosity of 2.05 fb−1 of pp collisions at s=7 teV collected with the AtLAs detector at the Large Hadron Collider. No significant excess of events over the expected background is observed and limits on the Higgs boson production cross section are derived for a Higgs boson mass in the range 110 GeVthe observations exclude the presence of a standard model Higgs boson with a mass 145t 95% confidence level.

关键词： Bosons

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search for a supersymmetric Partner to the top Quark in Final states with Jets and Missing transverse Momentum at s=7 teV with the AtLAs Detector

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Physical Review Letters 2012年第21期109卷 211802-211802页

作者： G. Aad t. Abajyan B. Abbott J. Abdallah s. Abdel Khalek A. A. Abdelalim O. Abdinov R. Aben B. Abi M. Abolins O. s. AbouZeid H. Abramowicz H. Abreu B. s. Acharya L. Adamczyk D. L. Adams t. N. Addy J. Adelman s. Adomeit P. Adragna t. Adye s. Aefsky J. A. Aguilar-saavedra M. Agustoni M. Aharrouche s. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli t. Akdogan t. P. A. Åkesson G. Akimoto A. V. Akimov M. s. Alam M. A. Alam J. Albert s. Albrand M. Aleksa i. N. Aleksandrov F. Alessandria C. Alexa G. Alexander G. Alexandre t. Alexopoulos M. Alhroob M. Aliev G. Alimonti J. Alison B. M. M. Allbrooke P. P. Allport s. E. Allwood-spiers J. Almond A. Aloisio R. Alon A. Alonso F. Alonso A. Altheimer B. Alvarez Gonzalez M. G. Alviggi K. Amako C. Amelung V. V. Ammosov s. P. Amor Dos santos A. Amorim N. Amram C. Anastopoulos L. s. Ancu N. Andari t. Andeen C. F. Anders G. Anders K. J. Anderson A. Andreazza V. Andrei X. s. Anduaga P. Anger A. Angerami F. Anghinolfi A. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli M. Aoki s. Aoun L. Aperio Bella R. Apolle G. Arabidze i. Aracena Y. Arai A. t. H. Arce s. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armbruster O. Arnaez V. Arnal C. Arnault A. Artamonov G. Artoni D. Arutinov s. Asai R. Asfandiyarov s. Ask B. Åsman L. Asquith K. Assamagan A. Astbury M. Atkinson B. Aubert E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen G. Azuelos Y. Azuma M. A. Baak G. Baccaglioni C. Bacci A. M. Bach H. Bachacou K. Bachas M. Backes M. Backhaus E. Badescu P. Bagnaia s. Bahinipati Y. Bai D. C. Bailey t. Bain J. t. Baines O. K. Baker M. D. Baker s. Baker E. Banas P. Banerjee sw. Banerjee D. Banfi A. Bangert V. Bansal H. s. Bansil L. Barak s. P. Baranov A. Barbaro Galtieri t. Barber E. L. Barberio D. Barberis M. Barbero D. Y. Bardin t. Barillari M. Barisonzi t. Barklow N. Barlow B. M. Barnett R. M. Barnett A. Baroncelli G. Barone A. J. Barr F. Barreiro J. Barreiro Guimarães da Costa P. Barrillon R. Bartoldus A. E. Barton V. Bartsch A. Basye R. L. Bates L. Batkova 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 for direct pair production of supersymmetric top squarks (t˜1) is presented, assuming the t˜1 decays into a top quark and the lightest supersymmetric particle, χ˜10, and that both top quarks decay to purely hadronic final states. A total of 16 (4) events are observed compared to a predicted standard model background of 13.5−3.6+3.7(4.4−1.3+1.7) events in two signal regions based on ∫Ldt=4.7 fb−1 of pp collision data taken at s=7 teV with the AtLAs detector at the LHC. An exclusion region in the t˜1 versus χ˜10 mass plane is evaluated: 370t˜1<465 GeV is excluded for mχ˜10∼0 GeV while mt˜1=445 GeV is excluded for mχ˜10≤50 GeV.

关键词： supersymmetry

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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. Abajyan B. Abbott J. Abdallah s. Abdel Khalek A. A. Abdelalim O. Abdinov R. Aben B. Abi M. Abolins O. s. AbouZeid H. Abramowicz H. Abreu B. s. Acharya L. Adamczyk D. L. Adams t. N. Addy J. Adelman s. Adomeit P. Adragna t. Adye s. Aefsky J. A. Aguilar-saavedra M. Agustoni M. Aharrouche s. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli t. Akdogan t. P. A. Åkesson G. Akimoto A. V. Akimov M. s. Alam M. A. Alam J. Albert s. Albrand M. Aleksa i. N. Aleksandrov F. Alessandria C. Alexa G. Alexander G. Alexandre t. Alexopoulos M. Alhroob M. Aliev G. Alimonti J. Alison B. M. M. Allbrooke P. P. Allport s. E. Allwood-spiers J. Almond A. Aloisio R. Alon A. Alonso F. Alonso 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 Bella R. Apolle G. Arabidze i. Aracena Y. Arai A. t. H. Arce s. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armbruster O. Arnaez V. Arnal C. Arnault A. Artamonov G. Artoni D. Arutinov s. Asai R. Asfandiyarov s. Ask B. Åsman L. Asquith K. Assamagan A. Astbury M. Atkinson B. Aubert E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen G. Azuelos Y. Azuma M. A. Baak G. Baccaglioni C. Bacci A. M. Bach H. Bachacou K. Bachas M. Backes M. Backhaus E. Badescu P. Bagnaia s. Bahinipati Y. Bai D. C. Bailey t. Bain J. t. Baines O. K. Baker M. D. Baker s. Baker E. Banas P. Banerjee sw. Banerjee D. Banfi A. Bangert V. Bansal H. s. Bansil L. Barak s. P. Baranov A. Barbaro Galtieri t. Barber E. L. Barberio D. Barberis M. Barbero D. Y. Bardin t. Barillari M. Barisonzi t. Barklow N. Barlow B. M. Barnett R. M. Barnett A. Baroncelli G. Barone A. J. Barr F. Barreiro J. Barreiro Guimarães da Costa P. Barrillon R. Bartoldus A. E. Barton V. Bartsch A. Basye R. L. Bates L. Batkova J. R. Batley A. Ba Fakultät für Mathematik und Physik Albert-Ludwigs-Universität Freiburg Germany Physikalisches Institut University of Bonn Bonn Germany Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institut de Física d’Altes Energies and Departament de Física de la Universitat Autònoma de Barcelona 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 based 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 be consistent with standard model expectations. top squark masses between 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： Photons

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search for Magnetic Monopoles in s=7 teV pp Collisions with the AtLAs Detector

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Physical Review Letters 2012年第26期109卷 261803-261803页

作者： G. Aad t. Abajyan B. Abbott J. Abdallah s. Abdel Khalek A. A. Abdelalim O. Abdinov R. Aben B. Abi M. Abolins O. s. AbouZeid H. Abramowicz H. Abreu E. Acerbi B. s. Acharya L. Adamczyk D. L. Adams t. N. Addy J. Adelman s. Adomeit P. Adragna t. Adye s. Aefsky J. A. Aguilar-saavedra M. Agustoni M. Aharrouche s. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli t. Akdogan t. P. A. Åkesson G. Akimoto A. V. Akimov M. s. Alam M. A. Alam J. Albert s. Albrand M. Aleksa i. N. Aleksandrov F. Alessandria C. Alexa G. Alexander G. Alexandre t. Alexopoulos M. Alhroob M. Aliev G. Alimonti J. Alison B. M. M. Allbrooke P. P. Allport s. E. Allwood-spiers J. Almond A. Aloisio R. Alon A. Alonso F. Alonso B. Alvarez Gonzalez M. G. Alviggi K. Amako C. Amelung V. V. Ammosov A. Amorim N. Amram C. Anastopoulos L. s. Ancu N. Andari t. Andeen C. F. Anders G. Anders K. J. Anderson A. Andreazza V. Andrei X. s. Anduaga P. Anger A. Angerami F. Anghinolfi A. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli M. Aoki s. Aoun L. Aperio Bella R. Apolle G. Arabidze i. Aracena Y. Arai A. t. H. Arce s. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armbruster O. Arnaez V. Arnal C. Arnault A. Artamonov G. Artoni D. Arutinov s. Asai R. Asfandiyarov s. Ask B. Åsman L. Asquith K. Assamagan A. Astbury M. Atkinson B. Aubert E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen G. Azuelos Y. Azuma M. A. Baak G. Baccaglioni C. Bacci A. M. Bach H. Bachacou K. Bachas M. Backes M. Backhaus E. Badescu P. Bagnaia s. Bahinipati Y. Bai D. C. Bailey t. Bain J. t. Baines O. K. Baker M. D. Baker s. Baker E. Banas P. Banerjee sw. Banerjee D. Banfi A. Bangert V. Bansal H. s. Bansil L. Barak s. P. Baranov A. Barbaro Galtieri t. Barber E. L. Barberio D. Barberis M. Barbero D. Y. Bardin t. Barillari M. Barisonzi t. Barklow N. Barlow B. M. Barnett R. M. Barnett A. Baroncelli G. Barone A. J. Barr F. Barreiro J. Barreiro Guimarães da Costa P. Barrillon R. Bartoldus A. E. Barton V. Bartsch R. L. Bates L. Batkova J. R. Batley A. Battaglia M. Batt 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 Sezione di Milano Milano Italy Dipartimento di Fisica Università di Milano Milano Italy INFN Gruppo Collegato di Udine Udine Italy ICTP Trieste Italy AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Physics Department Brookhaven National Laboratory Upton New York USA Department of Physics Hampton University Hampton Virginia USA Department of Physics Yale University New Haven Connecticut USA 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 USAUniversidad de Granada Granada Spain Albert

this Letter presents a search for magnetic monopoles with the AtLAs detector at the CERN Large Hadron Collider using an integrated luminosity of 2.0 fb−1 of pp collisions recorded at a center-of-mass energy of s=7 teV. No event is found in the signal region, leading to an upper limit on the production cross section at 95% confidence level of 1.6/ϵ fb for Dirac magnetic monopoles with the minimum unit magnetic charge and with mass between 200 GeV and 1500 GeV, where ϵ is the monopole reconstruction efficiency. the efficiency ϵ is high and uniform in the fiducial region given by pseudorapidity |η|<1.37 and transverse kinetic energy 600–700insin θ<1400 GeV. the minimum value of 700 GeV is for monopoles of mass 200 GeV, whereas the minimum value of 600 GeV is applicable for higher mass monopoles. therefore, the upper limit on the production cross section at 95% confidence level is 2 fb in this fiducial region. Assuming the kinematic distributions from Drell-Yan pair production of spin-1/2 Dirac magnetic monopoles, the efficiency is in the range 1%–10%, leading to an upper limit on the cross section at 95% confidence level that varies from 145 fb to 16 fb for monopoles with mass between 200 GeV and 1200 GeV. this limit is weaker than the fiducial limit because most of these monopoles lie outside the fiducial region.

关键词： Germanium alloys

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Notice of Retraction: Performance evaluation of sigmoid functions with hybrid computational method for Optimizing Lemon Grass Oil Production

Notice of Retraction: Performance evaluation of sigmoid func...

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international Conference on computer science and information technology (Csit)

作者： Brajesh Kumar singh Akash Punhani shafiqulabidin Ritu Nigam Department of Computer Science & Engineering F.E.T. R.B.S College Agra India Department of Information Technology Ministry of Manpower Al Musanna College of Technology Sultanate of Oman Oman Department of Computer Science & Engineering BMAS Engineering College Agra India

this article has been retracted by the publisher.

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Performance Evaluation of sigmoid Functions with Hybrid Computational Method for Optimizing Lemon Grass Oil Production

Performance Evaluation of Sigmoid Functions with Hybrid Comp...

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2010 3rd iEEE international Conference on computer science and information technology—iCCsit 2010

作者： Brajesh Kumar singh Akash Punhani shafiqulabidin Ritu Nigam Department of Computer Science & Engineering F.E.T. R.B.S.CollegeBichpuri AgraIndia Department of Information Technology Al Musanna College of Technology(Ministry of Manpower) Sultanate of Oman Department of Computer Science & Engineering BMAS Engineering College Agra India

two different Approaches are used to Optimize Lemon Grass Oil *** Production is compared and Production-Nutrient ratio comparison also shows that Logistic function is giving best result for production-nutrient *** log... 详细信息

关键词： Back propagation neural network,fertilizers,Genetic algorithm,oil production.

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Analysis and study of embedded capability to HsBH by sPA

Journal of Software

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Journal of software 2010年第11期5卷 1256-1261页

作者： Wang, Yuanzhi Chen, Liwei Zhang, Fei Jiang, shanhe sun, Lijuan School of Computer and Information Anqing Normal College Anhui China College of the Computer Science and Technology Southwest University of S and T Sichuan China School of Physics and Electric Engineering Anqing Normal College Anhui China College of Computer Harbin University of Science and Technology HeiLong Jiang China

steganography of sPA is one of the important research subjects in the field of information security. And HsBH is an effective image hiding algorithm. it proves that sPA can detect HsBH algorithm in theory and experiment. this method not only can detect the existence of messages embedded by sequential or random replacement, but also can estimate the hiding capability. Experimental results show that the correct rate of detection is above 95% when the embedding rate p>3%. © 2010 ACADEMY PUBLisHER.

关键词： steganography

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