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International Symposium on Wireless Communication Systems (ISWCS)

作者： Ferkan Yilmaz Oğuz Kucur Mohamed-Slim Alouini Electrical Engineering Program Division of Physical Sciences and Engineering King Abdullah University for Science and Technology Thuwal Makkah Saudi Arabia Electronics Engineering Department Gebze Institute of Technology Gebze Kocaeli Turkey

In this paper, we propose an analytical framework on the exact computation of the average symbol error probabilities (ASEP) of multihop transmission over generalized fading channels when an arbitrary number of amplify-and-forward relays is used. Our approach relies on moment generating function (MGF) framework to obtain exact single integral expressions which can be easily computed by Gauss-Chebyshev Quadrature (GCQ) rule. As such, the derived results are a convenient tool to analyze the ASEP performance of multihop transmission over amplify-and-forward relay fading channels. Numerical and simulation results, performed to verify the correctness of the proposed formulation, are in perfect agreement.

关键词： Fading Relays Modulation Wireless communication Error probability Signal to noise ratio Harmonic analysis

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Exact capacity analysis of multihop transmission over amplify-and-forward relay fading channels

Exact capacity analysis of multihop transmission over amplif...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Ferkan Yilmaz Oğguz Kucur Mohamed-Slim Alouini Electrical Engineering Program Division of Physical Sciences and Engineering King Abdullah University for Science and Technology Mecca Saudi Arabia Electronics Engineering Department Gebze Institute of Technology (GYTE) Gebze Kocaeli Turkey

In this paper, we propose an analytical framework on the exact computation of the average capacity of multihop transmission over amplify-and-forward relay fading channels. Our approach relies on the algebraic combination of Mellin and Laplace transforms to obtain exact single integral expressions which can be easily computed by Gauss-Chebyshev Quadrature (GCQ) rule. As such, the derived results are a convenient tool to analyze the average capacity of multihop transmission over amplify-and-forward relay fading channels. As an application of the analytical framework on the exact computation of the average capacity of multihop transmission, some examples are accentuated for generalized Nakagami-m fading channels. Numerical and simulation results, performed to verify the correctness of the proposed formulation, are in perfect agreement.

关键词： Relays Fading Wireless communication Signal to noise ratio Harmonic analysis Joints Approximation methods

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Factors Governing Fibrillogenesis of Polypeptide Chains Revealed by Lattice Models

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physical Review Letters 2010年第21期105卷 218101-218101页

作者： Mai Suan Li Nguyen Truong Co Govardhan Reddy Chin-Kun Hu J. E. Straub D. Thirumalai Institute of Physics Polish Academy of Sciences Al. Lotnikow 32/46 02-668 Warsaw Poland Saigon Institute for Computational Science and Technology 6 Quarter Linh Trung Ward Thu Duc District Ho Chi Minh City Vietnam Biophysics Program Institute for Physical Science and Technology University of Maryland College Park Maryland 20742 USA Institute of Physics Academia Sinica Nankang Taipei 11529 Taiwan Center for Nonlinear and Complex Systems and Department of Physics Chung Yuan Christian University Chungli 32023 Taiwan Department of Chemistry Boston University Boston Massachusetts 02215 USA Department of Chemistry and Biochemistry University of Maryland College Park Maryland 20742 USA

Using lattice models we explore the factors that determine the tendencies of polypeptide chains to aggregate by exhaustively sampling the sequence and conformational space. The morphologies of the fibril-like structures and the time scales (τfib) for their formation depend on a balance between hydrophobic and Coulomb interactions. The extent of population of an ensemble of N* structures, which are fibril-prone structures in the spectrum of conformations of an isolated protein, is the major determinant of τfib. This observation is used to determine the aggregating sequences by exhaustively exploring the sequence space, thus providing a basis for genome wide search of fragments that are aggregation prone.

关键词： Chains

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Microano-fabrication technologies for cell biology

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Medical & Biological Engineering & Computing 2010年第10期48卷 1023-1032页

作者： Qian, Tongcheng Wang, Yingxiao Department of Bioengineering and the Beckman Institute for Advanced Science and Technology University of Illinois at Urbana–Champaign Urbana USA Department of Biomedical Engineering Peking University Beijing People’s Republic of China Department of Integrative and Molecular Physiology Center for Biophysics and Computational Biology Institute for Genomic Biology Neuroscience Program University of Illinois at Urbana–Champaign Urbana USA

Micro/nano-fabrication techniques, such as soft lithography and electrospinning, have been well-developed and widely applied in many research fields in the past decade. Due to the low costs and simple procedures, these techniques have become important and popular for biological studies. In this review, we focus on the studies integrating micro/nano-fabrication work to elucidate the molecular mechanism of signaling transduction in cell biology. We first describe different micro/nano-fabrication technologies, including techniques generating three-dimensional scaffolds for tissue engineering. We then introduce the application of these technologies in manipulating the physical or chemical micro/nano-environment to regulate the cellular behavior and response, such as cell life and death, differentiation, proliferation, and cell migration. Recent advancement in integrating the micro/nano-technologies and live cell imaging are also discussed. Finally, potential schemes in cell biology involving micro/nano-fabrication technologies are proposed to provide perspectives on the future research activities.

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ERRATUM: 'FERMI DETECTION OF γ-RAY EMISSION FROM THE M2 SOFT X-RAY FLARE ON 2010 JUNE 12' (2012, ApJ, 745, 144)

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The Astrophysical Journal 2012年第2期748卷

作者： M. Ackermann M. Ajello A. Allafort W. B. Atwood L. Baldini G. Barbiellini D. Bastieri K. Bechtol R. Bellazzini P. N. Bhat R. D. Blandford E. Bonamente A. W. Borgland J. Bregeon M. S. Briggs M. Brigida P. Bruel R. Buehler J. M. Burgess S. Buson G. A. Caliandro R. A. Cameron J. M. Casandjian C. Cecchi E. Charles A. Chekhtman J. Chiang S. Ciprini R. Claus J. Cohen-Tanugi V. Connaughton J. Conrad S. Cutini B. R. Dennis F. de Palma C. D. Dermer S. W. Digel E. do Couto e Silva P. S. Drell A. Drlica-Wagner R. Dubois C. Favuzzi S. J. Fegan E. C. Ferrara P. Fortin Y. Fukazawa P. Fusco F. Gargano S. Germani N. Giglietto F. Giordano M. Giroletti T. Glanzman G. Godfrey L. Grillo J. E. Grove D. Gruber S. Guiriec D. Hadasch M. Hayashida E. Hays D. Horan G. Iafrate G. Jóhannesson A. S. Johnson W. N. Johnson T. Kamae R. M. Kippen J. Knödlseder M. Kuss J. Lande L. Latronico F. Longo F. Loparco B. Lott M. N. Lovellette P. Lubrano M. N. Mazziotta J. E. McEnery C. Meegan J. Mehault P. F. Michelson W. Mitthumsiri C. Monte M. E. Monzani A. Morselli I. V. Moskalenko S. Murgia R. Murphy M. Naumann-Godo E. Nuss T. Nymark M. Ohno T. Ohsugi A. Okumura N. Omodei E. Orlando W. S. Paciesas J. H. Panetta D. Parent M. Pesce-Rollins V. Petrosian M. Pierbattista F. Piron G. Pivato H. Poon T. A. Porter R. Preece S. Rainò R. Rando M. Razzano S. Razzaque A. Reimer O. Reimer S. Ritz C. Sbarra R. A. Schwartz C. Sgrò G. H. Share E. J. Siskind P. Spinelli H. Takahashi T. Tanaka Y. Tanaka J. B. Thayer L. Tibaldo M. Tinivella A. K. Tolbert G. Tosti E. Troja Y. Uchiyama T. L. Usher J. Vandenbroucke V. Vasileiou G. Vianello V. Vitale A. vonKienlin A. P. Waite C. Wilson-Hodge D. L. Wood K. S. Wood Z. Yang Deutsches Elektronen Synchrotron DESY D-15738 Zeuthen Germany W. W. Hansen Experimental Physics Laboratory Kavli Institute for Particle Astrophysics and Cosmology Department of Physics and SLAC National Accelerator Laboratory Stanford University Stanford CA 94305 USA Santa Cruz Institute for Particle Physics Department of Physics and Department of Astronomy and Astrophysics University of California at Santa Cruz Santa Cruz CA 95064 USA Istituto Nazionale di Fisica Nucleare Sezione di Pisa I-56127 Pisa Italy Istituto Nazionale di Fisica Nucleare Sezione di Trieste I-34127 Trieste Italy Dipartimento di Fisica Università di Trieste I-34127 Trieste Italy Istituto Nazionale di Fisica Nucleare Sezione di Padova I-35131 Padova Italy Dipartimento di Fisica 'G. Galilei ' Università di Padova I-35131 Padova Italy Center for Space Plasma and Aeronomic Research (CSPAR) University of Alabama in Huntsville Huntsville AL 35899 USA Istituto Nazionale di Fisica Nucleare Sezione di Perugia I-06123 Perugia Italy Dipartimento di Fisica Università degli Studi di Perugia I-06123 Perugia Italy Dipartimento di Fisica 'M. Merlin ' dell'Università e del Politecnico di Bari I-70126 Bari Italy Istituto Nazionale di Fisica Nucleare Sezione di Bari I-70126 Bari Italy Laboratoire Leprince-Ringuet École polytechnique CNRS/IN2P3 Palaiseau France Institut de Ciències de l'Espai (IEEE-CSIC) Campus UAB E-08193 Barcelona Spain Laboratoire AIM CEA-IRFU/CNRS/Université Paris Diderot Service d'Astrophysique CEA Saclay 91191 Gif sur Yvette France Artep Inc. 2922 Excelsior Springs Court Ellicott City MD 21042 USA Resident at Naval Research Laboratory Washington DC 20375 USA. ASI Science Data Center I-00044 Frascati (Roma) Italy Laboratoire Univers et Particules de Montpellier Université Montpellier 2 CNRS/IN2P3 Montpellier France Department of Physics Stockholm University AlbaNova SE-106 91 Stockholm Sweden The Oskar Klein Centre for Cosmoparticle Physics AlbaNova SE-106 91 Stockhol

Due to an error at the publisher, the times given for the major tick marks in the X-axis in Figure 1 of the published article are incorrect. The correctly labeled times should be '00:52:00,' '00:54:00,'..., and '01:04:00.' The correct version of Figure 1 and its caption is shown below. IOP Publishing sincerely regrets this error.

关键词： acceleration of particles Sun: flares Sun: particle emission Sun: X-rays, gamma rays

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Optically anisotropic infinite cylinder above an optically anisotropic half space: Dispersion interaction of a single-walled carbon nanotube with a substrate

Optically anisotropic infinite cylinder above an optically a...

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作者： Šiber, A. Rajter, R.F. French, R.H. Ching, W.Y. Parsegian, V.A. Podgornik, R. Institute of Physics Bijenička Cesta 46 10001 Zagreb Croatia Department of Materials Science and Engineering Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139 United States DuPont Co. Central Research Experimental Station E400-5207 Wilmington DE 19880 United States Department of Physics University of Missouri-Kansas City Kansas City MO 64110 United States Department of Physics University of Massachusetts Amherst MA 01003 United States University of Ljubljana J. Stefan Institute Laboratory of Physical and Structural Biology National Institutes of Health Bethesda MD 20892-0924 United States Department of Physics Institute of Biophysics School of Medicine SI-1000 Ljubljana Slovenia Department of Theoretical Physics SI-1000 Ljubljana Slovenia

A complete form of the van der Waals dispersion interaction between an infinitely long anisotropic semiconducting/insulating thin cylinder and an anisotropic half space is derived for all separations between the cylinder and the half space. The derivation proceeds from the theory of dispersion interactions between two anisotropic infinite half spaces as formulated in Phys. Rev. A 71, 042102 (2005). The approach is valid in the retarded as well as nonretarded regimes of the interaction and is coupled with the recently evaluated ab initio dielectric response functions of various semiconducting/insulating single wall carbon nanotubes, enables the authors to evaluate the strength of the van der Waals dispersion interaction for all orientation angles and separations between a thin cylindrical nanotube and the half space. The possibility of repulsive and/or nonmonotonic dispersion interactions is examined in detail. © 2010 American Vacuum Society.

关键词： Cylinders (shapes)

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Study of Z Boson Production in PbPb Collisions at sNN=2.76 TeV

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physical Review Letters 2011年第21期106卷 212301-212301页

作者： S. Chatrchyan V. Khachatryan A. M. Sirunyan A. Tumasyan W. Adam T. Bergauer M. Dragicevic J. Erö C. Fabjan M. Friedl R. Frühwirth V. M. Ghete J. Hammer S. Hänsel C. Hartl M. Hoch N. Hörmann J. Hrubec M. Jeitler G. Kasieczka W. Kiesenhofer M. Krammer D. Liko I. Mikulec M. Pernicka H. Rohringer R. Schöfbeck J. Strauss F. Teischinger P. Wagner W. Waltenberger G. Walzel E. Widl C.-E. Wulz V. Mossolov N. Shumeiko J. Suarez Gonzalez L. Benucci E. A. De Wolf X. Janssen T. Maes L. Mucibello S. Ochesanu B. Roland R. Rougny M. Selvaggi H. Van Haevermaet P. Van Mechelen N. Van Remortel F. Blekman S. Blyweert J. D’Hondt O. Devroede R. Gonzalez Suarez A. Kalogeropoulos J. Maes M. Maes W. Van Doninck P. Van Mulders G. P. Van Onsem I. Villella O. Charaf B. Clerbaux G. De Lentdecker V. Dero A. P. R. Gay G. H. Hammad T. Hreus P. E. Marage L. Thomas C. Vander Velde P. Vanlaer J. Wickens V. Adler S. Costantini M. Grunewald B. Klein A. Marinov J. Mccartin D. Ryckbosch F. Thyssen M. Tytgat L. Vanelderen P. Verwilligen S. Walsh N. Zaganidis S. Basegmez G. Bruno J. Caudron L. Ceard E. Cortina Gil C. Delaere D. Favart A. Giammanco G. Grégoire J. Hollar V. Lemaitre J. Liao O. Militaru S. Ovyn D. Pagano A. Pin K. Piotrzkowski N. Schul N. Beliy T. Caebergs E. Daubie G. A. Alves D. De Jesus Damiao M. E. Pol M. H. G. Souza W. Carvalho E. M. Da Costa C. De Oliveira Martins S. Fonseca De Souza L. Mundim H. Nogima V. Oguri W. L. Prado Da Silva A. Santoro S. M. Silva Do Amaral A. Sznajder F. Torres Da Silva De Araujo F. A. Dias T. R. Fernandez Perez Tomei E. M. Gregores C. Lagana F. Marinho P. G. Mercadante S. F. Novaes Sandra S. Padula N. Darmenov L. Dimitrov V. Genchev P. Iaydjiev S. Piperov M. Rodozov S. Stoykova G. Sultanov V. Tcholakov R. Trayanov I. Vankov M. Dyulendarova R. Hadjiiska V. Kozhuharov L. Litov E. Marinova M. Mateev B. Pavlov P. Petkov J. G. Bian G. M. Chen H. S. Chen C. H. Jiang D. Liang S. Liang X. Meng J. Tao J. Wang X. Wang Z. Wang H. Xiao M. Xu J. Zang Z. Zhang Y. Ban S. Guo Y. Guo W. Li Y. Mao S. J. Qian H. Teng L. Zhang Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik der OeAW Wien Austria National Centre for Particle and High Energy Physics Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Université de Mons Mons Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Instituto de Fisica Teorica Universidade Estadual Paulista Sao Paulo Brazil Institute for Nuclear Research and Nuclear Energy Sofia Bulgaria University of Sofia Sofia Bulgaria Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Massachusetts Institute of Technology Cambridge USA Universidad de Los Andes Bogota Colombia Technical University of Split Split Croatia University of Split Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland Laboratoire d’Annecy-le-Vieux de Physique des Particules IN2P3-CNRS Annecy-le-Vieux France DSM/IRFU CEA/Saclay Gif-sur-Yvette France Laboratoire Leprince-Ringuet Ecole Polytechnique IN2P3-CNRS Palaiseau France Institut Pluridisciplinaire Hubert Curien Université de Strasbourg Université de Haute Alsace Mulhouse CNRS/IN2P3 Strasbourg France Centre de Calcul de l’Institut National de Physique Nucleaire et de Physique des Particules (IN2P3) Villeurbanne France Unive

A search for Z bosons in the μ+μ− decay channel has been performed in PbPb collisions at sNN=2.76 TeV with the CMS detector at the LHC, in a 7.2 μb−1 data sample. The number of opposite-sign muon pairs observed in the 60–120 GeV/c2 invariant mass range is 39, corresponding to a yield per unit of rapidity (y) and per minimum bias event of [33.8±5.5(stat)±4.4(syst)]×10−8, in the |y|<2.0 range. Rapidity, transverse momentum, and centrality dependencies are also measured. The results agree with next-to-leading order QCD calculations, scaled by the number of incoherent nucleon-nucleon collisions.

关键词： Binary alloys

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Search for Pair Production of Second-Generation Scalar Leptoquarks in pp Collisions at s=7 TeV

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physical Review Letters 2011年第20期106卷 201803-201803页

作者： V. Khachatryan A. M. Sirunyan A. Tumasyan W. Adam T. Bergauer M. Dragicevic J. Erö C. Fabjan M. Friedl R. Frühwirth V. M. Ghete J. Hammer S. Hänsel C. Hartl M. Hoch N. Hörmann J. Hrubec M. Jeitler G. Kasieczka W. Kiesenhofer M. Krammer D. Liko I. Mikulec M. Pernicka H. Rohringer R. Schöfbeck J. Strauss A. Taurok F. Teischinger P. Wagner W. Waltenberger G. Walzel E. Widl C.-E. Wulz V. Mossolov N. Shumeiko J. Suarez Gonzalez L. Benucci K. Cerny E. A. De Wolf X. Janssen T. Maes L. Mucibello S. Ochesanu B. Roland R. Rougny M. Selvaggi H. Van Haevermaet P. Van Mechelen N. Van Remortel S. Beauceron F. Blekman S. Blyweert J. D’Hondt O. Devroede R. Gonzalez Suarez A. Kalogeropoulos J. Maes M. Maes S. Tavernier W. Van Doninck P. Van Mulders G. P. Van Onsem I. Villella O. Charaf B. Clerbaux G. De Lentdecker V. Dero A. P. R. Gay G. H. Hammad T. Hreus P. E. Marage L. Thomas C. Vander Velde P. Vanlaer J. Wickens V. Adler S. Costantini M. Grunewald B. Klein A. Marinov J. Mccartin D. Ryckbosch F. Thyssen M. Tytgat L. Vanelderen P. Verwilligen S. Walsh N. Zaganidis S. Basegmez G. Bruno J. Caudron L. Ceard J. De Favereau De Jeneret C. Delaere P. Demin D. Favart A. Giammanco G. Grégoire J. Hollar V. Lemaitre J. Liao O. Militaru S. Ovyn D. Pagano A. Pin K. Piotrzkowski N. Schul N. Beliy T. Caebergs E. Daubie G. A. Alves D. De Jesus Damiao M. E. Pol M. H. G. Souza W. Carvalho E. M. Da Costa C. De Oliveira Martins S. Fonseca De Souza L. Mundim H. Nogima V. Oguri W. L. Prado Da Silva A. Santoro S. M. Silva Do Amaral A. Sznajder F. Torres Da Silva De Araujo F. A. Dias M. A. F. Dias T. R. Fernandez Perez Tomei E. M. Gregores F. Marinho S. F. Novaes Sandra S. Padula N. Darmenov L. Dimitrov V. Genchev P. Iaydjiev S. Piperov M. Rodozov S. Stoykova G. Sultanov V. Tcholakov R. Trayanov I. Vankov M. Dyulendarova R. Hadjiiska V. Kozhuharov L. Litov E. Marinova M. Mateev B. Pavlov P. Petkov J. G. Bian G. M. Chen H. S. Chen C. H. Jiang D. Liang S. Liang J. Wang X. Wang Z. Wang M. Xu M. Yang J. Zang Z. Zhang Y. Ban S. Guo Y. Guo W. Li Y. Mao S. Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik der OeAW Wien Austria National Centre for Particle and High Energy Physics Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Université de Mons Mons Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Instituto de Fisica Teorica Universidade Estadual Paulista Sao Paulo Brazil Institute for Nuclear Research and Nuclear Energy Sofia Bulgaria University of Sofia Sofia Bulgaria Institute of High Energy Physics Beijing China Massachusetts Institute of Technology Cambridge USA State Key Lab. of Nucl. Phys. and Tech. Peking University Beijing China Universidad de Los Andes Bogota Colombia Technical University of Split Split Croatia University of Split Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland Laboratoire d’Annecy-le-Vieux de Physique des Particules IN2P3-CNRS Annecy-le-Vieux France DSM/IRFU CEA/Saclay Gif-sur-Yvette France Laboratoire Leprince-Ringuet Ecole Polytechnique IN2P3-CNRS Palaiseau France Institut Pluridisciplinaire Hubert Curien Université de Strasbourg Université de Haute Alsace Mulhouse CNRS/IN2P3 Strasbourg France Centre de Calcul de l’Institut National de Physique Nucleaire et de Physique des Particules (IN2P3) Villeurbanne France Université de Lyon Université Claude Bernard Lyon 1 CNRS-IN2P

A search for pair production of second-generation scalar leptoquarks in the final state with two muons and two jets is performed using proton-proton collision data at s=7 TeV collected by the CMS detector at the LHC. The data sample used corresponds to an integrated luminosity of 34 pb−1. The number of observed events is in good agreement with the predictions from the standard model processes. An upper limit is set on the second-generation leptoquark cross section times β2 as a function of the leptoquark mass, and leptoquarks with masses below 394 GeV are excluded at a 95% confidence level for β=1, where β is the leptoquark branching fraction into a muon and a quark. These limits are the most stringent to date.

关键词： Germanium alloys

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Search for Pair Production of First-Generation Scalar Leptoquarks in pp Collisions at s=7 TeV

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physical Review Letters 2011年第20期106卷 201802-201802页

作者： V. Khachatryan A. M. Sirunyan A. Tumasyan W. Adam T. Bergauer M. Dragicevic J. Erö C. Fabjan M. Friedl R. Frühwirth V. M. Ghete J. Hammer S. Hänsel C. Hartl M. Hoch N. Hörmann J. Hrubec M. Jeitler G. Kasieczka W. Kiesenhofer M. Krammer D. Liko I. Mikulec M. Pernicka H. Rohringer R. Schöfbeck J. Strauss A. Taurok F. Teischinger P. Wagner W. Waltenberger G. Walzel E. Widl C.-E. Wulz V. Mossolov N. Shumeiko J. Suarez Gonzalez L. Benucci K. Cerny E. A. De Wolf X. Janssen T. Maes L. Mucibello S. Ochesanu B. Roland R. Rougny M. Selvaggi H. Van Haevermaet P. Van Mechelen N. Van Remortel S. Beauceron F. Blekman S. Blyweert J. D’Hondt O. Devroede R. Gonzalez Suarez A. Kalogeropoulos J. Maes M. Maes S. Tavernier W. Van Doninck P. Van Mulders G. P. Van Onsem I. Villella O. Charaf B. Clerbaux G. De Lentdecker V. Dero A. P. R. Gay G. H. Hammad T. Hreus P. E. Marage L. Thomas C. Vander Velde P. Vanlaer J. Wickens V. Adler S. Costantini M. Grunewald B. Klein A. Marinov J. Mccartin D. Ryckbosch F. Thyssen M. Tytgat L. Vanelderen P. Verwilligen S. Walsh N. Zaganidis S. Basegmez G. Bruno J. Caudron L. Ceard J. De Favereau De Jeneret C. Delaere P. Demin D. Favart A. Giammanco G. Grégoire J. Hollar V. Lemaitre J. Liao O. Militaru S. Ovyn D. Pagano A. Pin K. Piotrzkowski N. Schul N. Beliy T. Caebergs E. Daubie G. A. Alves D. De Jesus Damiao M. E. Pol M. H. G. Souza W. Carvalho E. M. Da Costa C. De Oliveira Martins S. Fonseca De Souza L. Mundim H. Nogima V. Oguri W. L. Prado Da Silva A. Santoro S. M. Silva Do Amaral A. Sznajder F. Torres Da Silva De Araujo F. A. Dias M. A. F. Dias T. R. Fernandez Perez Tomei E. M. Gregores F. Marinho S. F. Novaes Sandra S. Padula N. Darmenov L. Dimitrov V. Genchev P. Iaydjiev S. Piperov M. Rodozov S. Stoykova G. Sultanov V. Tcholakov R. Trayanov I. Vankov M. Dyulendarova R. Hadjiiska V. Kozhuharov L. Litov E. Marinova M. Mateev B. Pavlov P. Petkov J. G. Bian G. M. Chen H. S. Chen C. H. Jiang D. Liang S. Liang J. Wang X. Wang Z. Wang M. Xu M. Yang J. Zang Z. Zhang Y. Ban S. Guo Y. Guo W. Li Y. Mao S. J Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik der OeAW Wien Austria National Centre for Particle and High Energy Physics Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Université de Mons Mons Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Instituto de Fisica Teorica Universidade Estadual Paulista Sao Paulo Brazil Institute for Nuclear Research and Nuclear Energy Sofia Bulgaria University of Sofia Sofia Bulgaria Institute of High Energy Physics Beijing China Massachusetts Institute of Technology Cambridge USA State Key Lab. of Nucl. Phys. and Tech. Peking University Beijing China Universidad de Los Andes Bogota Colombia Technical University of Split Split Croatia University of Split Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland Laboratoire d’Annecy-le-Vieux de Physique des Particules IN2P3-CNRS Annecy-le-Vieux France DSM/IRFU CEA/Saclay Gif-sur-Yvette France Laboratoire Leprince-Ringuet Ecole Polytechnique IN2P3-CNRS Palaiseau France Institut Pluridisciplinaire Hubert Curien Université de Strasbourg Université de Haute Alsace Mulhouse CNRS/IN2P3 Strasbourg France Centre de Calcul de l’Institut National de Physique Nucleaire et de Physique des Particules (IN2P3) Villeurbanne France Université de Lyon Université Claude Bernard Lyon 1 CNRS-IN2P

A search for pair production of first-generation scalar leptoquarks is performed in the final state containing two electrons and two jets using proton-proton collision data at s=7 TeV. The data sample used corresponds to an integrated luminosity of 33 pb−1 collected with the CMS detector at the CERN LHC. The number of observed events is in good agreement with the predictions for the standard model background processes, and an upper limit is set on the leptoquark pair production cross section times β2 as a function of the leptoquark mass, where β is the branching fraction of the leptoquark decay to an electron and a quark. A 95% confidence level lower limit is set on the mass of a first-generation scalar leptoquark at 384 GeV for β=1, which is the most stringent direct limit to date.

关键词： Germanium compounds

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Measurement of Dijet Angular Distributions and Search for Quark Compositeness in pp Collisions at s=7 TeV

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physical Review Letters 2011年第20期106卷 201804-201804页

作者： V. Khachatryan A. M. Sirunyan A. Tumasyan W. Adam T. Bergauer M. Dragicevic J. Erö C. Fabjan M. Friedl R. Frühwirth V. M. Ghete J. Hammer S. Hänsel C. Hartl M. Hoch N. Hörmann J. Hrubec M. Jeitler G. Kasieczka W. Kiesenhofer M. Krammer D. Liko I. Mikulec M. Pernicka H. Rohringer R. Schöfbeck J. Strauss A. Taurok F. Teischinger P. Wagner W. Waltenberger G. Walzel E. Widl C.-E. Wulz V. Mossolov N. Shumeiko J. Suarez Gonzalez L. Benucci K. Cerny E. A. De Wolf X. Janssen T. Maes L. Mucibello S. Ochesanu B. Roland R. Rougny M. Selvaggi H. Van Haevermaet P. Van Mechelen N. Van Remortel S. Beauceron F. Blekman S. Blyweert J. D’Hondt O. Devroede R. Gonzalez Suarez A. Kalogeropoulos J. Maes M. Maes S. Tavernier W. Van Doninck P. Van Mulders G. P. Van Onsem I. Villella O. Charaf B. Clerbaux G. De Lentdecker V. Dero A. P. R. Gay G. H. Hammad T. Hreus P. E. Marage L. Thomas C. Vander Velde P. Vanlaer J. Wickens V. Adler S. Costantini M. Grunewald B. Klein A. Marinov J. Mccartin D. Ryckbosch F. Thyssen M. Tytgat L. Vanelderen P. Verwilligen S. Walsh N. Zaganidis S. Basegmez G. Bruno J. Caudron L. Ceard J. De Favereau De Jeneret C. Delaere P. Demin D. Favart A. Giammanco G. Grégoire J. Hollar V. Lemaitre J. Liao O. Militaru S. Ovyn D. Pagano A. Pin K. Piotrzkowski N. Schul N. Beliy T. Caebergs E. Daubie G. A. Alves D. De Jesus Damiao M. E. Pol M. H. G. Souza W. Carvalho E. M. Da Costa C. De Oliveira Martins S. Fonseca De Souza L. Mundim H. Nogima V. Oguri W. L. Prado Da Silva A. Santoro S. M. Silva Do Amaral A. Sznajder F. Torres Da Silva De Araujo F. A. Dias M. A. F. Dias T. R. Fernandez Perez Tomei E. M. Gregores F. Marinho S. F. Novaes Sandra S. Padula N. Darmenov L. Dimitrov V. Genchev P. Iaydjiev S. Piperov M. Rodozov S. Stoykova G. Sultanov V. Tcholakov R. Trayanov I. Vankov M. Dyulendarova R. Hadjiiska V. Kozhuharov L. Litov E. Marinova M. Mateev B. Pavlov P. Petkov J. G. Bian G. M. Chen H. S. Chen C. H. Jiang D. Liang S. Liang J. Wang X. Wang Z. Wang M. Xu M. Yang J. Zang Z. Zhang Y. Ban S. Guo Y. Guo W. Li Y. Mao S. J Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik der OeAW Wien Austria National Centre for Particle and High Energy Physics Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Université de Mons Mons Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Instituto de Fisica Teorica Universidade Estadual Paulista Sao Paulo Brazil Institute for Nuclear Research and Nuclear Energy Sofia Bulgaria University of Sofia Sofia Bulgaria Institute of High Energy Physics Beijing China Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Universidad de Los Andes Bogota Colombia Technical University of Split Split Croatia University of Split Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland Laboratoire d’Annecy-le-Vieux de Physique des Particules IN2P3-CNRS Annecy-le-Vieux France DSM/IRFU CEA/Saclay Gif-sur-Yvette France Laboratoire Leprince-Ringuet Ecole Polytechnique IN2P3-CNRS Palaiseau France Institut Pluridisciplinaire Hubert Curien Université de Strasbourg Université de Haute Alsace Mulhouse CNRS/IN2P3 Strasbourg France Centre de Calcul de l’Institut National de Physique Nucleaire et de Physique des Particules (IN2P3) Ville

Dijet angular distributions are measured over a wide range of dijet invariant masses in pp collisions at s=7 TeV, at the CERN LHC. The event sample, recorded with the CMS detector, corresponds to an integrated luminosity of 36 pb−1. The data are found to be in good agreement with the predictions of perturbative QCD, and yield no evidence of quark compositeness. With a modified frequentist approach, a lower limit on the contact interaction scale for left-handed quarks of Λ+=5.6 TeV (Λ−=6.7 TeV) for destructive (constructive) interference is obtained at the 95% confidence level.

关键词： Elementary particles

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