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iEEE international Conference on Power Electronics and Motion Control

作者： Wang, Yan Ojleska, Vesna Jing, Yuanwei Gugulovska, tatjana K. Dimirovski, Georgi M. Northeastern University and Institute of Eng. College of I. S. and E. Shenyang China SS Cyril and Methodius University Faculty of EEIT Skopje Macedonia Northeastern University College of Information Science and Engineering China Dogus University Computer Eng. and Control Eng Istanbul Turkey

ISBN: (纸本)9781424478545

the short term load forecasting plays a significant role in the management of power system supply for countries and regions, in particular in cases of insufficient electric energy for increased needs. A back-propagation artificial neural-network (BP-ANN) genetic algorithm (GA) based optimizing technique for improved accuracy of predictions short term loads is proposed. With GA's optimizing and BP-ANN's dynamic capacity, the weighted GA optimization is realized by selection, crossing and mutation operations. the performance of the proposed technique has been tested using load time-series from a real-world electrical power system. its prediction has been compared to those of obtained by only backpropagation based neural-network techniques. simulation results demonstrated that the here proposed technique possesses superior performance thus guarantees better forecasting. © 2010 iEEE.

关键词： Neural networks

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Review of Particle Physics*

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Physical Review D 2012年第1期86卷 010001-010001页

作者： J. Beringer J. -F. Arguin R. M. Barnett K. Copic O. Dahl D. E. Groom C. -J. Lin J. Lys H. Murayama C. G. Wohl W. -M. Yao P. A. Zyla C. Amsler M. Antonelli D. M. Asner H. Baer H. R. Band t. Basaglia C. W. Bauer J. J. Beatty V. i. Belousov E. Bergren G. Bernardi W. Bertl s. Bethke H. Bichsel O. Biebel E. Blucher s. Blusk G. Brooijmans O. Buchmueller R. N. Cahn M. Carena A. Ceccucci D. Chakraborty M. -C. Chen R. s. Chivukula G. Cowan G. D'Ambrosio t. Damour D. de Florian A. de Gouvêa t. DeGrand P. de Jong G. Dissertori B. Dobrescu M. Doser M. Drees D. A. Edwards s. Eidelman J. Erler V. V. Ezhela W. Fetscher B. D. Fields B. Foster t. K. Gaisser L. Garren H. -J. Gerber G. Gerbier t. Gherghetta s. Golwala M. Goodman C. Grab A. V. Gritsan J. -F. Grivaz M. Grünewald A. Gurtu t. Gutsche H. E. Haber K. Hagiwara C. Hagmann C. Hanhart s. Hashimoto K. G. Hayes M. Heffner B. Heltsley J. J. Hernández-Rey K. Hikasa A. Höcker J. Holder A. Holtkamp J. Huston J. D. Jackson K. F. Johnson t. Junk D. Karlen D. Kirkby s. R. Klein E. Klempt R. V. Kowalewski F. Krauss M. Kreps B. Krusche Yu. V. Kuyanov Y. Kwon O. Lahav J. Laiho P. Langacker A. Liddle Z. Ligeti t. M. Liss L. Littenberg K. s. Lugovsky s. B. Lugovsky t. Mannel A. V. Manohar W. J. Marciano A. D. Martin A. Masoni J. Matthews D. Milstead R. Miquel K. Mönig F. Moortgat K. Nakamura M. Narain P. Nason s. Navas M. Neubert P. Nevski Y. Nir K. A. Olive L. Pape J. Parsons C. Patrignani J. A. Peacock s. t. Petcov A. Piepke A. Pomarol G. Punzi A. Quadt s. Raby G. Raffelt B. N. Ratcliff P. Richardson s. Roesler s. Rolli A. Romaniouk L. J. Rosenberg J. L. Rosner C. t. sachrajda Y. sakai G. P. salam s. sarkar F. sauli O. schneider K. scholberg D. scott W. G. seligman M. H. shaevitz s. R. sharpe M. silari t. sjöstrand P. skands J. G. smith G. F. smoot s. spanier H. spieler A. stahl t. stanev s. L. stone t. sumiyoshi M. J. syphers F. takahashi M. tanabashi J. terning M. titov N. P. tkachenko N. A. törnqvist D. tovey G. Valencia K. van Bibber G. Venanzoni M. G. Vincter P. Vogel A. Vogt W. Wa Physics Division Lawrence Berkeley National Laboratory 1 Cyclotron Road Berkeley CA 94720 USA Département de physique Université de Montréal C.P. 6128 succ. centre-ville Montréal (Québec) H3C 3J7 Canada Kavli IPMU (WPI) Todai Institutes for Advanced Study University of Tokyo Kashiwa Chiba 277-8583 Japan Department of Physics University of California Berkeley CA 94720 USA Physik-Institut Universität Zürich CH-8057 Zürich Switzerland Albert Einstein Center for Fundamental Physics Universität Bern CH-3012 Bern Switzerland Lab. Nazionali di Frascati dell'INFN CP 13 via E. Fermi 40 I-00044 Frascati (Roma) Italy Pacific Northwest National Laboratory 902 Battelle Boulevard Richland WA 99352 USA Department of Physics Florida State University Tallahassee FL 32306 USA Department of Physics University of Wisconsin Madison WI 53706 USA CERN European Organization for Nuclear Research CH-1211 Genève 23 Switzerland Department of Physics The Ohio State University 191 W. Woodruff Ave. Columbus OH 43210 COMPAS Group Institute for High Energy Physics RU-142284 Protvino Russia LPNHE IN2P3-CNRS et Universités de Paris 6 et 7 F-75252 Paris France Paul Scherrer Institut CH-5232 Villigen PSI Switzerland Max-Planck-Institute of Physics 80805 Munich Germany Department of Physics University of Washington Seattle WA 98195 USA Ludwig-Maximilians-Universität Fakultät für Physik Schellingstr. 4 D-80799 München Germany Enrico Fermi Institute and Department of Physics University of Chicago Chicago IL 60637-1433 USA Department of Physics Syracuse University Syracuse NY 13244-1130 USA Department of Physics Columbia University 538 W. 120th Street New York NY 10027 USA High Energy Physics Group Blackett Laboratory Imperial College Prince Consort Road London SW7 2AZ UK Fermi National Accelerator Laboratory P.O. Box 500 Batavia IL 60510 USA Kavli Institute for Cosmological Physics University of Chicago Chicago IL 60637-1433 USA Department of Physics Norther

this biennial Review summarizes much of particle physics. Using data from previous editions, plus 2658 new measurements from 644 papers, we list, evaluate, and average measured properties of gauge bosons, leptons, quarks, mesons, and baryons. We summarize searches for hypothetical particles such as Higgs bosons, heavy neutrinos, and supersymmetric particles. All the particle properties and search limits are listed in summary tables. We also give numerous tables, figures, formulae, and reviews of topics such as the standard Model, particle detectors, probability, and statistics. Among the 112 reviews are many that are new or heavily revised including those on Heavy-Quark and soft-Collinear Effective theory, Neutrino Cross section Measurements, Monte Carlo Event Generators, Lattice QCD, Heavy Quarkonium spectroscopy, top Quark, Dark Matter, Vcb & Vub, Quantum Chromodynamics, High-Energy Collider Parameters, Astrophysical Constants, Cosmological Parameters, and Dark Matter.

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Communities of practice of e-learning, an innovative learning space for e-learning actors

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Procedia - social and Behavioral sciences 2010年第2期2卷 5022-5027页

作者： Azeddine Chikh Lamia Berkani Department of Information Systems College of Computer and Information SciencesKSU 11543 Riyadh Saudi Arabia Department of Computer Science Faculty of Computer and Electrical Engineering U.S.T.H.B 16111 Algiers Algeria

today collaboration and information exchange and sharing are critical in driving both individual and organizational success. Communities of Practice (CoPs) represent an environment in which individuals, experts and novices, learn together to develop and improve their professional practices and skills. they are therefore the best environment for individual and collective learning. the purpose of this article is to show the potential of social learning in the domain of e-learning, through CoPs of e-learning (CoPEs). We present the main concepts and objectives of CoPEs and explain how they can support e-learning actors in their daily activities. An example of a CoPE, whose main objective is to promote e-learning in higher education context applied to the domain of computer science, is also presented.

关键词： E-learning commutity of practice commutity of practice of e-learning social learning innovation

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A process for knowledge reuse in communities of practice of e-learning

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Procedia - social and Behavioral sciences 2010年第2期2卷 4436-4443页

作者： Lamia Berkani Azeddine Chikh Department of Computer Science Faculty of Computer and Electrical Engineering U.S.T.H.B 16111 Algiers Algeria Department of Information Systems College of Computer and Information SciencesKSU 11543 Riyadh Saudi Arabia

Knowledge management aims at capturing, transferring, and reusing knowledge. We are interested by knowledge reuse within Communities of Practice of E-learning (CoPEs). Pertinent reuse would facilitate learning of e-learning actors, increase their productivity and finally improve the quality of their artefacts. the present paper proposes a process for knowledge reuse within a CoPE, composed of two subprocesses: (1) reification process, transforming tacit and Elicit knowledge to a new Elicit Knowledge, and (2) An indexing process, making reusable the previous resulted knowledge. two knowledge indexing techniques are used: (a) Knowledge Annotation, using the concepts of O’CoPE ontology, and (b) Knowledge intentionalisation using members’ intentions. Moreover an adaptation process of Knowledge regarding the members’ profiles allows a personalized reuse of that knowledge.

关键词： CoP of e-learning Knowledge reuse Knowledge reification Knowledge indexing Knowledge adaptation member's Profile Reuse intention

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Measurement of the transverse momentum distribution of W bosons in pp collisions at s=7 teV with the AtLAs detector

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Physical Review D 2012年第1期85卷 012005-012005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 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 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 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 G. Atoian B. Aubert E. Auge K. Augsten M. Aurousseau N. Austin 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 D. Bartsch V. Bartsch R. L. Bates L. Batkova J. R. Batley A. Battaglia M. 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 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 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 Portugal 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 Università di Roma To

this paper describes a measurement of the W boson transverse momentum distribution using AtLAs pp collision data from the 2010 run of the LHC at s=7 teV, corresponding to an integrated luminosity of about 31 pb−1. Events form both W→eν and W→μν are used, and the transverse momentum of the W candidates is measured through the energy deposition in the calorimeter from the recoil of the W. the resulting distributions are unfolded to obtain the normalized differential cross sections as a function of the W boson transverse momentum. We present results for ptW<300 GeV in the electron and muon channels as well as for their combination, and compare the combined results to the predictions of perturbative QCD and a selection of event generators.

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Measurement of inclusive jet and dijet production in pp collisions at s=7 teV using the AtLAs detector

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Physical Review D 2012年第1期86卷 014022-014022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 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 A. Aktas 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 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 G. Atoian 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. Battagl 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 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 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 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 U

inclusive jet and dijet cross sections have been measured in proton-proton collisions at a center-of-mass energy of 7 teV using the AtLAs detector at the Large Hadron Collider. the cross sections were measured using jets clustered with the anti-kt algorithm with parameters R=0.4 and R=0.6. these measurements are based on the 2010 data sample, consisting of a total integrated luminosity of 37 pb−1. inclusive jet double-differential cross sections are presented as a function of jet transverse momentum, in bins of jet rapidity. Dijet double-differential cross sections are studied as a function of the dijet invariant mass, in bins of half the rapidity separation of the two leading jets. the measurements are performed in the jet rapidity range |y|<4.4, covering jet transverse momenta from 20 GeV to 1.5 teV and dijet invariant masses from 70 GeV to 5 teV. the data are compared to expectations based on next-to-leading-order QCD calculations corrected for nonperturbative effects, as well as to next-to-leading-order Monte Carlo predictions. in addition to a test of the theory in a new kinematic regime, the data also provide sensitivity to parton distribution functions in a region where they are currently not well-constrained.

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Ks0 and Λ production in pp interactions at s=0.9 and 7 teV measured with the AtLAs detector at the LHC

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Physical Review D 2012年第1期85卷 012001-012001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 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 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 A. Artamonov G. Artoni D. Arutinov s. Asai R. Asfandiyarov s. Ask B. Åsman L. Asquith K. Assamagan A. Astbury A. Astvatsatourov G. Atoian 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 R. Bartoldus A. E. Barton V. Bartsch R. L. Bates L. Batkova J. R. Batley A. Battaglia M. Battistin G. Battistoni F. 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 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 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 Università di Roma Tor V

the production of Ks0 and Λ hadrons is studied in pp collision data at s=0.9 and 7 teV collected with the AtLAs detector at the LHC using a minimum-bias trigger. the observed distributions of transverse momentum, rapidity, and multiplicity are corrected to hadron level in a model-independent way within well-defined phase-space regions. the distribution of the production ratio of Λ¯ to Λ baryons is also measured. the results are compared with various Monte Carlo simulation models. Although most of these models agree with data to within 15% in the Ks0 distributions, substantial disagreements are found in the Λ distributions of transverse momentum.

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Measurement of the production cross section for Z/γ* in association with jets in pp collisions at s=7 teV with the AtLAs detector

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Physical Review D 2012年第3期85卷 032009-032009页

Results are presented on the production of jets of particles in association with a Z/γ* boson, in proton-proton collisions at s=7 teV with the AtLAs detector. the analysis includes the full 2010 data set, collected with a low rate of multiple proton-proton collisions in the accelerator, corresponding to an integrated luminosity of 36 pb−1. inclusive jet cross sections in Z/γ* events, with Z/γ* decaying into electron or muon pairs, are measured for jets with transverse momentum pt>30 GeV and jet rapidity |y|<4.4. the measurements are compared to next-to-leading-order perturbative QCD calculations, and to predictions from different Monte Carlo generators implementing leading-order matrix elements supplemented by parton showers.

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study of jets produced in association with a W boson in pp collisions at s=7 teV with the AtLAs detector

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Physical Review D 2012年第9期85卷 092002-092002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 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 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 at Dal

We report a study of final states containing a W boson and hadronic jets, produced in proton-proton collisions at a center-of-mass energy of 7 teV. the data were collected with the AtLAs detector at the CERN LHC and comprise the full 2010 data sample of 36 pb−1. Cross sections are determined using both the electron and muon decay modes of the W boson and are presented as a function of inclusive jet multiplicity, Njet, for up to five jets. At each multiplicity, cross sections are presented as a function of jet transverse momentum, the scalar sum of the transverse momenta of the charged lepton, missing transverse momentum, and all jets, the invariant mass spectra of jets, and the rapidity distributions of various combinations of leptons and final-state jets. the results, corrected for all detector effects and for all backgrounds such as diboson and top quark pair production, are compared with particle-level predictions from perturbative QCD. Leading-order multiparton event generators, normalized to the next-to-next-to-leading-order total cross section for inclusive W-boson production, describe the data reasonably well for all measured inclusive jet multiplicities. Next-to-leading-order calculations from MCFM, studied here for Njet≤2, and BlackHat-sherpa, studied here for Njet≤4, are found to be mostly in good agreement with the data.

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

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

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

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

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