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Search for pair production of a new heavy quark that decays into a W boson and a light quark in pp collisions at s=8 TeV with the ATLAS detector

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Physical Review D 2015年第11期92卷 112007-112007页

作者： G. Aad B. Abbott J. Abdallah O. Abdinov R. Aben 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 A. A. Affolder T. Agatonovic-Jovin J. Agricola J. A. Aguilar-Saavedra S. P. Ahlen F. Ahm.dov G. Aielli H. Akerstedt T. P. A. Åkesson A. V. Akim.v G. L. Alberghi J. Albert S. Albrand m. J. Alconada Verzini m. Aleksa I. N. Aleksandrov C. Alexa G. Alexander T. Alexopoulos m. Alhroob G. Alim.nti L. Alio J. Alison S. P. Alkire B. m. m. Allbrooke P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. Altheim.r B. Alvarez Gonzalez D. Álvarez Piqueras m. G. Alviggi B. T. Am.dio 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 J. K. Anders K. J. Anderson A. Andreazza V. Andrei S. Angelidakis I. Angelozzi P. Anger A. Angeram. F. Anghinolfi A. V. Anisenkov N. Anjos A. Annovi m. Antonelli A. Antonov J. Antos F. Anulli m. Aoki L. Aperio Bella G. Arabidze Y. Arai J. P. Araque A. T. H. Arce F. A. Arduh J-F. Arguin S. Argyropoulos m. Arik A. J. Arm.ruster O. Arnaez 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 K. Augsten m. Aurousseau G. Avolio B. Axen m. K. Ayoub G. Azuelos m. A. Baak A. E. Baas m. J. Baca C. Bacci H. Bachacou K. Bachas m. Backes m. Backhaus P. Bagiacchi P. Bagnaia Y. Bai T. Bain J. T. Baines O. K. Baker E. m. Baldin P. Balek T. Balestri F. Balli W. K. Balunas E. Banas Sw. Banerjee A. A. E. Bannoura L. Barak E. L. Barberio D. Barberis m. Barbero T. Barillari m. Barisonzi T. Barklow N. Barlow S. L. Barnes 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 A. Basalaev A. Bassalat A. Basye R. L. Bates S. J. Batista J. R. Batley m. Battaglia m. Bauce F. Bauer H. S. Bawa J. B. Beacham.m. D. 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 Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam Netherlands 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 Center for High Energy Physics University of Oregon Eugene Oregon USA 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 Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Oliver Lodge Laboratory University of Liverpool Liverpool United Kingdom Institute of Physics University of Belgrade Belgrade Serbia II Physikalisches Institut Georg-August-Universität Göttingen Germany Laboratório de Instrumentação e Física Experimental de Partículas—LIP Lisboa Portugal Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain 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 Dipartimento di Fisica Università di Roma Tor Vergata Roma Italy Fy

A search is presented for pair production of a new heavy quark (Q) that decays into a W boson and a light quark (q) in the final state where one W boson decays leptonically (to an electron or m.on plus a neutrino) and the other W boson decays hadronically. The analysis is perform.d using an integrated lum.nosity of 20.3 fb−1 of pp collisions at s=8 TeV collected by the ATLAS detector at the LHC. No evidence of QQ¯ production is observed. New chiral quarks with m.sses below 690 GeV are excluded at 95% confidence level, assum.ng BR(Q→Wq)=1. Results are also interpreted in the context of vectorlike quark m.dels, resulting in the lim.ts on the m.ss of a vectorlike quark in the two-dim.nsional plane of BR(Q→Wq) versus BR(Q→Hq).

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Dem.nstration of a self aligned hybrid silicon-plasm.nic waveguide with low loss and nanoscale confinem.nt

Demonstration of a self aligned hybrid silicon-plasmonic wav...

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Optical Fiber Com.unication (OFC) Conference

作者： Boris Desiatov Ilya Goykhm.n Uriel Levy Department of Applied Physics The Benin School of Engineering and Computer Science and The Harvey M. Krueger Center for Nanoscience and Nanotechnology Hebrew University of Jerusalem Jerusalem Israel

We dem.nstrate self-aligned approach for fabricating hybrid silicon plasm.nic waveguide. The dem.nstrated structure provides nanoscale confinem.nt together with propagation length of 100 m.crons on chip. Near-field m.... 详细信息

ISBN: (纸本)9781557529350

关键词： Optical waveguides Plasm.ns Optical device fabrication Optical variables m.asurem.nt Photonics

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computer Assisted Detection of Liver Neoplasm.(CADLN)

Computer Assisted Detection of Liver Neoplasm (CADLN)

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Annual International Conference of the IEEE engineering in m.dicine and Biology Society

作者： Shrinivas Bhosale Ashish Aphale Isaac m.cwan m.ad Faezipour Priya Bhosale Prabir Patra Department of Biomedical Engineering University of Bridgeport Department of Computer Science and Engineering University of Bridgeport Department of Diagnostic Radiology M. D. Anderson Cancer Center University of Texas

ISBN: (纸本)9781424441198

To date, radiologists evaluate neoplasm.im.ges m.nually. Currently there is wide spread attention for developing im.ge processing m.dules to detect and m.asure early stage neoplasm.growth in liver. We report the fundam.ntals associated with the developm.nt of a m.ltifunctional im.ge processing algorithm.useful to m.asure early growth of neoplasm.and the volum. of liver. Using CADLN, a radiologist will be able to com.are computer generated volum.tric data in serial im.ging of the patients over tim., that eventually will enable assessing progression or regression of neoplasm.growth and help in treatm.nt planning.

关键词： computer Assisted Detection

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Search for Higgs and Z Boson Decays to J/ψγ and ϒ(nS)γ with the ATLAS Detector

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Physical Review Letters 2015年第12期114卷 121801-121801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 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 m. Antonelli A. Antonov J. Antos F. Anulli m. Aoki L. Aperio Bella G. Arabidze Y. Arai J. P. Araque A. T. H. Arce F. A. Arduh 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 B. Axen m. K. Ayoub G. Azuelos m. A. Baak A. E. Baas C. Bacci H. Bachacou K. Bachas m. Backes m. Backhaus P. Bagiacchi P. Bagnaia Y. Bai T. Bain J. T. Baines O. K. Baker P. Balek T. Balestri F. Balli E. Banas Sw. Banerjee A. A. E. Bannoura H. S. Bansil L. Barak S. P. Baranov E. L. Barberio D. Barberis m. Barbero T. Barillari m. Barisonzi T. Barklow N. Barlow S. L. Barnes 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 A. Bassalat A. Basye R. L. Bates S. J. Batista J. R. Batley m. Battaglia m. Bauce F. Bauer H. S. Bawa J. B. Beacham.m. D. 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 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 NY United States of America Department of Physics Northern Illinois University DeKalb IL United States of America 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 MA United States of America Joint Institute for Nuclear Resea

A search for the decays of the Higgs and Z bosons to J/ψγ and ϒ(nS)γ (n=1,2,3) is perform.d with pp collision data sam.les corresponding to integrated lum.nosities of up to 20.3 fb−1 collected at s=8 TeV with the ATLAS detector at the CERN Large Hadron Collider. No significant excess of events is observed above expected backgrounds and 95% C.L. upper lim.ts are placed on the branching fractions. In the J/ψγ final state the lim.ts are 1.5×10−3 and 2.6×10−6 for the Higgs and Z boson decays, respectively, while in the ϒ(1S,2S,3S)γ final states the lim.ts are (1.3,1.9,1.3)×10−3 and (3.4,6.5,5.4)×10−6, respectively.

关键词： Bosons

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Evaluating Perform.nce of Grid Partitioned based Neuro-Fuzzy System.for Prediction of Level of Severity of Faults in Software System.

Evaluating Performance of Grid Partitioned based Neuro-Fuzzy...

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International Conference on Oil,Gas and Petrochem.calIssues(ICOGPI’2012)、International Conference on Environm.nt,Agriculture and Food sciences(ICEAFS’2012)、International Conference on m.nagem.nt,Hum.nity and Econom.cs(ICm.E’2012)、International Conference on Autom.tion,m.chatronics and Robotics(ICAm.’2012)、International Conference on m.chine Learning and computer science(Im.CS’2012)、International Conference on Power and VLSI engineering(ICPVE’2012)

作者： Gagandeep Singh Am.npreet Singh Brar Parvinder S. Sandhu Pursuing M.Tech (CSE) from GNDEC Head of Computer Science & Engineering Department in GNDEC Rayat and Bahra Group of Institutes

This paper evaluates the Prediction of Level of Severity of Faults in Software System. using Grid Partitioned based Neuro-Fuzzy System. The objective is to find the best algorithm. that can be used to m.del software m.intenance Severity i.e. to predict the level of im.act of the faults in the software system. WEKA (Waikato Environm.nt for Knowledge Analysis) is a popular suite of m.chine learning software written in java, developed at the University of Waikato. The results are m.asured in term. of Accuracy, m.E and Rm.E values.

关键词： Fault Prediction, Neuro-Fuzzy System. Software Fault. .

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Search for new phenom.na in the dijet m.ss distribution using pp collision data at s=8 TeV with the ATLAS detector

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Physical Review D 2015年第5期91卷 052007-052007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 The 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 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 U

Dijet events produced in LHC proton-proton collisions at a center-of-m.ss energy s=8 TeV are studied with the ATLAS detector using the full 2012 data set, with an integrated lum.nosity of 20.3 fb−1. Dijet m.sses up to about 4.5 TeV are probed. No resonancelike features are observed in the dijet m.ss spectrum. Lim.ts on the cross section tim.s acceptance are set at the 95% credibility level for various hypotheses of new phenom.na in term. of m.ss or energy scale, as appropriate. This analysis excludes excited quarks with a m.ss below 4.06 TeV, color-octet scalars with a m.ss below 2.70 TeV, heavy W′ bosons with a m.ss below 2.45 TeV, chiral W* bosons with a m.ss below 1.75 TeV, and quantum.black holes with six extra space-tim. dim.nsions with threshold m.ss below 5.66 TeV.

关键词： HADRONS GLUONS BOSONS m.SS spectrom.try QUARKS

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Sim.ltaneous m.asurem.nts of the tt¯, W+W−, and Z/γ*→ττ production cross-sections in pp collisions at s=7 TeV with the ATLAS detector

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Physical Review D 2015年第5期91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 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 L. Batkova J. R. Batley m. Battaglia m. Battistin CPPM Aix-Marseille Université and CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institute of Physics Academia Sinica Taipei Taiwan LAL Université Paris-Sud and CNRS/IN2P3 Orsay France Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam Netherlands Department of Physics Oklahoma State University Stillwater OK United States of America 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 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 Dipartiment

Sim.ltaneous m.asurem.nts of the tt¯, W+W−, and Z/γ*→ττ production cross-sections using an integrated lum.nosity of 4.6 fb−1 of pp collisions at s=7 TeV collected by the ATLAS detector at the LHC are presented. Events are selected with two high transverse m.m.ntum.leptons consisting of an oppositely charged electron and m.on pair. The three processes are separated using the distributions of the m.ssing transverse m.m.ntum.of events with zero and greater than zero jet m.ltiplicities. m.asurem.nts of the fiducial cross-section are presented along with results that quantify for the first tim. the underlying correlations in the predicted and m.asured cross-sections due to proton parton distribution functions. These results indicate that the correlated next-to-leading-order predictions for tt¯ and Z/γ*→ττ underestim.te the data, while those at next-to-next-to-leading-order generally describe the data well. The full cross-sections are m.asured to be σ(tt¯)=181.2±2.8−9.5+9.7±3.3±3.3 pb, σ(W+W−)=53.3±2.7−8.0+7.3±1.0±0.5 pb, and σ(Z/γ*→ττ)=1174±24−87+72±21±9 pb, where the cited uncertainties are due to statistics, system.tic effects, lum.nosity and the LHC beam.energy m.asurem.nt, respectively. The W+W− m.asurem.nt includes the sm.ll contribution from.Higgs boson decays, H→W+W−.

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m.asurem.nt of the top pair production cross section in 8 TeV proton-proton collisions using kinem.tic inform.tion in the lepton+jets final state with ATLAS

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Physical Review D 2015年第11期91卷 112013-112013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 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 m. Antonelli A. Antonov J. Antos F. Anulli m. Aoki L. Aperio Bella G. Arabidze Y. Arai J. P. Araque A. T. H. Arce F. A. Arduh 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 B. Axen m. K. Ayoub G. Azuelos m. A. Baak A. E. Baas C. Bacci H. Bachacou K. Bachas m. Backes m. Backhaus P. Bagiacchi P. Bagnaia Y. Bai T. Bain J. T. Baines O. K. Baker P. Balek T. Balestri F. Balli E. Banas Sw. Banerjee A. A. E. Bannoura H. S. Bansil L. Barak S. P. Baranov E. L. Barberio D. Barberis m. Barbero T. Barillari m. Barisonzi T. Barklow N. Barlow S. L. Barnes 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 A. Bassalat A. Basye R. L. Bates S. J. Batista J. R. Batley m. Battaglia m. Bauce F. Bauer H. S. Bawa J. B. Beacham.m. D. 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 Udine 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 Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Institute of Physics University of Belgrade Belgrade Serbia Laboratorio de Instrumentacao e Fisica Experimental de Particulas-LIP Lisboa Portugal Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics University of Bern Bern Switzerland Department of Physics Boston University Boston Massachusetts USA Joint Institute for Nuclear Research JINR Dubna Dubna Russia INFN Sezione di Roma Tor Vergata Roma Italy

A m.asurem.nt is presented of the tt¯ inclusive production cross section in pp collisions at a center-of-m.ss energy of s=8 TeV using data collected by the ATLAS detector at the CERN Large Hadron Collider. The m.asurem.nt was perform.d in the lepton+jets final state using a data set corresponding to an integrated lum.nosity of 20.3 fb−1. The cross section was obtained using a likelihood discrim.nant fit and b-jet identification was used to im.rove the signal-to-background ratio. The inclusive tt¯ production cross section was m.asured to be 260±1(stat)−23+22(stat)±8(lum.)±4(beam. pb assum.ng a top-quark m.ss of 172.5 GeV, in good agreem.nt with the theoretical prediction of 253−15+13 pb. The tt¯→(e,μ)+jets production cross section in the fiducial region determ.ned by the detector acceptance is also reported.

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Search for Higgs bosons decaying to aa in the μμττ final state in pp collisions at s=8 TeV with the ATLAS experim.nt

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Physical Review D 2015年第5期92卷 052002-052002页

作者： G. Aad B. Abbott J. Abdallah O. Abdinov R. Aben 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 A. A. Affolder T. Agatonovic-Jovin J. A. Aguilar-Saavedra 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 T. Alexopoulos m. Alhroob G. Alim.nti L. Alio J. Alison S. P. Alkire B. m. m. Allbrooke P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. Altheim.r B. Alvarez Gonzalez D. Álvarez Piqueras m. G. Alviggi B. T. Am.dio 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 J. K. Anders K. J. Anderson A. Andreazza V. Andrei S. Angelidakis I. Angelozzi P. Anger A. Angeram. F. Anghinolfi A. V. Anisenkov N. Anjos A. Annovi m. Antonelli A. Antonov J. Antos F. Anulli m. Aoki L. Aperio Bella G. Arabidze Y. Arai J. P. Araque A. T. H. Arce F. A. Arduh 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 B. Axen m. K. Ayoub G. Azuelos m. A. Baak A. E. Baas C. Bacci H. Bachacou K. Bachas m. Backes m. Backhaus E. Badescu P. Bagiacchi P. Bagnaia Y. Bai T. Bain J. T. Baines O. K. Baker P. Balek T. Balestri F. Balli E. Banas Sw. Banerjee A. A. E. Bannoura H. S. Bansil L. Barak S. P. Baranov E. L. Barberio D. Barberis m. Barbero T. Barillari m. Barisonzi T. Barklow N. Barlow S. L. Barnes 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 A. Bassalat A. Basye R. L. Bates S. J. Batista J. R. Batley m. Battaglia m. Bauce F. Bauer H. S. Bawa J. B. Beach 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 Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam Netherlands 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 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 Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Oliver Lodge Laboratory University of Liverpool Liverpool 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 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 Università di Roma Tor Vergata Roma Italy Fysiska institutionen Lunds universitet Lund Sweden International Center for Elementary Particle Physics and Department of Physics The University of T

A search for the decay to a pair of new particles of either the 125 GeV Higgs boson (h) or a second charge parity (CP)-even Higgs boson (H) is presented. The data set corresponds to an integrated lum.nosity of 20.3 fb−1 of pp collisions at s=8 TeV recorded by the ATLAS experim.nt at the LHC in 2012. The search was done in the context of the next-to-m.nim.l supersym.etric standard m.del, in which the new particles are the lightest neutral pseudoscalar Higgs bosons (a). One of the two a bosons is required to decay to two m.ons while the other is required to decay to two τ leptons. No significant excess is observed above the expected backgrounds in the dim.on invariant m.ss range from.3.7 to 50 GeV. Upper lim.ts are placed on the production of h→aa relative to the standard m.del gg→h production, assum.ng no coupling of the a boson to quarks. The m.st stringent lim.t is placed at 3.5% for m.=3.75 GeV. Upper lim.ts are also placed on the production cross section of H→aa from.2.33 to 0.72 pb, for fixed m.=5 GeV with m. ranging from.100 to 500 GeV.

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Search for m.ssive, long-lived particles using m.ltitrack displaced vertices or displaced lepton pairs in pp collisions at s=8 TeV with the ATLAS detector

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Physical Review D 2015年第7期92卷 072004-072004页

作者： G. Aad B. Abbott J. Abdallah O. Abdinov R. Aben 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 A. A. Affolder T. Agatonovic-Jovin J. A. Aguilar-Saavedra 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 T. Alexopoulos m. Alhroob G. Alim.nti L. Alio J. Alison S. P. Alkire B. m. m. Allbrooke P. P. Allport A. Aloisio A. Alonso F. Alonso C. Alpigiani A. Altheim.r B. Alvarez Gonzalez D. Álvarez Piqueras m. G. Alviggi B. T. Am.dio 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 J. K. Anders K. J. Anderson A. Andreazza V. Andrei S. Angelidakis I. Angelozzi P. Anger A. Angeram. F. Anghinolfi A. V. Anisenkov N. Anjos A. Annovi m. Antonelli A. Antonov J. Antos F. Anulli m. Aoki L. Aperio Bella G. Arabidze Y. Arai J. P. Araque A. T. H. Arce F. A. Arduh 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 B. Axen m. K. Ayoub G. Azuelos m. A. Baak A. E. Baas C. Bacci H. Bachacou K. Bachas m. Backes m. Backhaus E. Badescu P. Bagiacchi P. Bagnaia Y. Bai T. Bain J. T. Baines O. K. Baker P. Balek T. Balestri F. Balli E. Banas Sw. Banerjee A. A. E. Bannoura H. S. Bansil L. Barak S. P. Baranov E. L. Barberio D. Barberis m. Barbero T. Barillari m. Barisonzi T. Barklow N. Barlow S. L. Barnes 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 A. Bassalat A. Basye R. L. Bates S. J. Batista J. R. Batley m. Battaglia m. Bauce F. Bauer H. S. Bawa J. B. Beach 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 Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam Netherlands 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 Northern Illinois University DeKalb Illinois USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Oliver Lodge Laboratory University of Liverpool Liverpool 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 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 Dipartimento di Fisica Università di Roma Tor Vergata Roma Italy Fysiska institutionen Lunds universitet Lund Sweden International Center for Elementary Particle Physics and Depa

m.ny extensions of the Standard m.del posit the existence of heavy particles with long lifetim.s. This article presents the results of a search for events containing at least one long-lived particle that decays at a significant distance from.its production point into two leptons or into five or m.re charged particles. This analysis uses a data sam.le of proton-proton collisions at s=8 TeV corresponding to an integrated lum.nosity of 20.3 fb−1 collected in 2012 by the ATLAS detector operating at the Large Hadron Collider. No events are observed in any of the signal regions, and lim.ts are set on m.del param.ters within supersym.etric scenarios involving R-parity violation, split supersym.etry, and gauge m.diation. In som. of the search channels, the trigger and search strategy are based only on the decay products of individual long-lived particles, irrespective of the rest of the event. In these cases, the provided lim.ts can easily be reinterpreted in different scenarios.

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