- Open Access
Search for Pair Production of First-Generation Scalar Leptoquarks in Collisions at
V. Khachatryan1, A. M. Sirunyan1, A. Tumasyan1, W. Adam2, T. Bergauer2, M. Dragicevic2, J. Erö2, C. Fabjan2, M. Friedl2 et al. (CMS Collaboration)
M. Friedl2, R. Frühwirth2, V. M. Ghete2, J. Hammer2,c, S. Hänsel2, C. Hartl2, M. Hoch2, N. Hörmann2, J. Hrubec2, M. Jeitler2, G. Kasieczka2, W. Kiesenhofer2, M. Krammer2, D. Liko2, I. Mikulec2, M. Pernicka2, H. Rohringer2, R. Schöfbeck2, J. Strauss2, A. Taurok2, F. Teischinger2, P. Wagner2, W. Waltenberger2, G. Walzel2, E. Widl2, C.-E. Wulz2, V. Mossolov3, N. Shumeiko3, J. Suarez Gonzalez3, L. Benucci4, K. Cerny4, E. A. De Wolf4, X. Janssen4, T. Maes4, L. Mucibello4, S. Ochesanu4, B. Roland4, R. Rougny4, M. Selvaggi4, H. Van Haevermaet4, P. Van Mechelen4, N. Van Remortel4, S. Beauceron5, F. Blekman5, S. Blyweert5, J. D’Hondt5, O. Devroede5, R. Gonzalez Suarez5, A. Kalogeropoulos5, J. Maes5, M. Maes5, S. Tavernier5, W. Van Doninck5, P. Van Mulders5, G. P. Van Onsem5, I. Villella5, O. Charaf6, B. Clerbaux6, G. De Lentdecker6, V. Dero6, A. P. R. Gay6, G. H. Hammad6, T. Hreus6, P. E. Marage6, L. Thomas6, C. Vander Velde6, P. Vanlaer6, J. Wickens6, V. Adler7, S. Costantini7, M. 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Ocalan104, A. Ozpineci104, M. Serin104, R. Sever104, U. E. Surat104, E. Yildirim104, M. Zeyrek104, M. Deliomeroglu105, D. Demir105,hh, E. Gülmez105, A. Halu105, B. Isildak105, M. Kaya105,ii, O. Kaya105,ii, S. Ozkorucuklu105,jj, N. Sonmez105,kk, L. Levchuk106, P. Bell107, F. Bostock107, J. J. Brooke107, T. L. Cheng107, E. Clement107, D. Cussans107, R. Frazier107, J. Goldstein107, M. Grimes107, M. Hansen107, D. Hartley107, G. P. Heath107, H. F. Heath107, B. Huckvale107, J. Jackson107, L. Kreczko107, S. Metson107, D. M. Newbold107,ll, K. Nirunpong107, A. Poll107, S. Senkin107, V. J. Smith107, S. Ward107, L. Basso108,mm, K. W. Bell108, A. Belyaev108,mm, C. Brew108, R. M. Brown108, B. Camanzi108, D. J. A. Cockerill108, J. A. Coughlan108, K. Harder108, S. Harper108, B. W. Kennedy108, E. Olaiya108, D. Petyt108, B. C. Radburn-Smith108, C. H. Shepherd-Themistocleous108, I. R. Tomalin108, W. J. Womersley108, S. D. Worm108, R. Bainbridge109, G. Ball109, J. Ballin109, R. Beuselinck109, O. 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Panwalkar152, R. Patel152, A. Richards152, K. Rose152, S. Schnetzer152, S. Somalwar152, R. Stone152, S. Thomas152, G. Cerizza153, M. Hollingsworth153, S. Spanier153, Z. C. Yang153, A. York153, J. Asaadi154, R. Eusebi154, J. Gilmore154, A. Gurrola154, T. Kamon154, V. Khotilovich154, R. Montalvo154, C. N. Nguyen154, I. Osipenkov154, J. Pivarski154, A. Safonov154, S. Sengupta154, A. Tatarinov154, D. Toback154, M. Weinberger154, N. Akchurin155, C. Bardak155, J. Damgov155, C. Jeong155, K. Kovitanggoon155, S. W. Lee155, P. Mane155, Y. Roh155, A. Sill155, I. Volobouev155, R. Wigmans155, E. Yazgan155, E. Appelt156, E. Brownson156, D. Engh156, C. Florez156, W. Gabella156, W. Johns156, P. Kurt156, C. Maguire156, A. Melo156, P. Sheldon156, S. Tuo156, J. Velkovska156, M. W. Arenton157, M. Balazs157, S. Boutle157, M. Buehler157, S. Conetti157, B. Cox157, B. Francis157, R. Hirosky157, A. Ledovskoy157, C. Lin157, C. Neu157, R. Yohay157, S. Gollapinni158, R. Harr158, P. E. Karchin158, P. Lamichhane158, M. Mattson158, C. Milstène158, A. Sakharov158, M. Anderson159, M. Bachtis159, J. N. Bellinger159, D. Carlsmith159, S. Dasu159, J. Efron159, L. Gray159, K. S. Grogg159, M. Grothe159, R. Hall-Wilton159,c, M. Herndon159, P. Klabbers159, J. Klukas159, A. Lanaro159, C. Lazaridis159, J. Leonard159, R. Loveless159, A. Mohapatra159, D. Reeder159, I. Ross159, A. Savin159, W. H. Smith159, J. Swanson159, and M. Weinberg159 (CMS Collaboration)
- 1Yerevan Physics Institute, Yerevan, Armenia
- 2Institut für Hochenergiephysik der OeAW, Wien, Austria
- 3National Centre for Particle and High Energy Physics, Minsk, Belarus
- 4Universiteit Antwerpen, Antwerpen, Belgium
- 5Vrije Universiteit Brussel, Brussel, Belgium
- 6Université Libre de Bruxelles, Bruxelles, Belgium
- 7Ghent University, Ghent, Belgium
- 8Université Catholique de Louvain, Louvain-la-Neuve, Belgium
- 9Université de Mons, Mons, Belgium
- 10Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, Brazil
- 11Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
- 12Instituto de Fisica Teorica, Universidade Estadual Paulista, Sao Paulo, Brazil
- 13Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria
- 14University of Sofia, Sofia, Bulgaria
- 15Institute of High Energy Physics, Beijing, China
- 16State Key Lab. of Nucl. Phys. and Tech., Peking University, Beijing, China
- 17Universidad de Los Andes, Bogota, Colombia
- 18Technical University of Split, Split, Croatia
- 19University of Split, Split, Croatia
- 20Institute Rudjer Boskovic, Zagreb, Croatia
- 21University of Cyprus, Nicosia, Cyprus
- 22Academy of Scientific Research and Technology of the Arab Republic of Egypt, Egyptian Network of High Energy Physics, Cairo, Egypt
- 23National Institute of Chemical Physics and Biophysics, Tallinn, Estonia
- 24Department of Physics, University of Helsinki, Helsinki, Finland
- 25Helsinki Institute of Physics, Helsinki, Finland
- 26Lappeenranta University of Technology, Lappeenranta, Finland
- 27Laboratoire d’Annecy-le-Vieux de Physique des Particules, IN2P3-CNRS, Annecy-le-Vieux, France
- 28DSM/IRFU, CEA/Saclay, Gif-sur-Yvette, France
- 29Laboratoire Leprince-Ringuet, Ecole Polytechnique, IN2P3-CNRS, Palaiseau, France
- 30Institut Pluridisciplinaire Hubert Curien, Université de Strasbourg, Université de Haute Alsace Mulhouse, CNRS/IN2P3, Strasbourg, France
- 31Centre de Calcul de l’Institut National de Physique Nucleaire et de Physique des Particules (IN2P3), Villeurbanne, France
- 32Université de Lyon, Université Claude Bernard Lyon 1, CNRS-IN2P3, Institut de Physique Nucléaire de Lyon, Villeurbanne, France
- 33E. Andronikashvili Institute of Physics, Academy of Science, Tbilisi, Georgia
- 34Institute of High Energy Physics and Informatization, Tbilisi State University, Tbilisi, Georgia
- 35RWTH Aachen University, I. Physikalisches Institut, Aachen, Germany
- 36RWTH Aachen University, III. Physikalisches Institut A, Aachen, Germany
- 37RWTH Aachen University, III. Physikalisches Institut B, Aachen, Germany
- 38Deutsches Elektronen-Synchrotron, Hamburg, Germany
- 39University of Hamburg, Hamburg, Germany
- 40Institut für Experimentelle Kernphysik, Karlsruhe, Germany
- 41Institute of Nuclear Physics “Demokritos”, Aghia Paraskevi, Greece
- 42University of Athens, Athens, Greece
- 43University of Ioánnina, Ioánnina, Greece
- 44KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary
- 45Institute of Nuclear Research ATOMKI, Debrecen, Hungary
- 46University of Debrecen, Debrecen, Hungary
- 47Panjab University, Chandigarh, India
- 48University of Delhi, Delhi, India
- 49Bhabha Atomic Research Centre, Mumbai, India
- 50Tata Institute of Fundamental Research - EHEP, Mumbai, India
- 51Tata Institute of Fundamental Research - HECR, Mumbai, India
- 52Institute for Research and Fundamental Sciences (IPM), Tehran, Iran
- 53INFN Sezione di Bari, Università di Bari, Politecnico di Bari, Bari, Italy
- 53aINFN Sezione di Bari
- 53bUniversità di Bari
- 53cPolitecnico di Bari
- 54INFN Sezione di Bologna, Università di Bologna, Bologna, Italy
- 54aINFN Sezione di Bologna
- 54bUniversità di Bologna
- 55INFN Sezione di Catania, Università di Catania, Catania, Italy
- 55aINFN Sezione di Catania
- 55bUniversità di Catania
- 56INFN Sezione di Firenze, Università di Firenze, Firenze, Italy
- 56aINFN Sezione di Firenze
- 56bUniversità di Firenze
- 57aINFN Laboratori Nazionali di Frascati, Frascati, Italy
- 58aINFN Sezione di Genova, Genova, Italy
- 59INFN Sezione di Milano-Biccoca, Università di Milano-Bicocca, Milano, Italy
- 59aINFN Sezione di Milano-Biccoca
- 59bUniversità di Milano-Bicocca
- 60INFN Sezione di Napoli, Università di Napoli “Federico II”, Napoli, Italy
- 60aINFN Sezione di Napoli
- 60bUniversità di Napoli “Federico II”
- 61INFN Sezione di Padova, Università di Padova, Università di Trento (Trento), Padova, Italy
- 61aINFN Sezione di Padova
- 61bUniversità di Padova
- 61cUniversità di Trento (Trento)
- 62INFN Sezione di Pavia, Università di Pavia, Pavia, Italy
- 62aINFN Sezione di Pavia
- 62bUniversità di Pavia
- 63INFN Sezione di Perugia, Università di Perugia, Perugia, Italy
- 63aINFN Sezione di Perugia
- 63bUniversità di Perugia
- 64INFN Sezione di Pisa, Università di Pisa, Scuola Normale Superiore di Pisa, Pisa, Italy
- 64aINFN Sezione di Pisa
- 64bUniversità di Pisa
- 64cScuola Normale Superiore di Pisa
- 65INFN Sezione di Roma, Università di Roma “La Sapienza”, Roma, Italy
- 65aINFN Sezione di Roma
- 65bUniversità di Roma “La Sapienza”
- 66INFN Sezione di Torino, Università di Torino, Università del Piemonte Orientale (Novara), Torino, Italy
- 66aINFN Sezione di Torino
- 66bUniversità di Torino
- 66cUniversità del Piemonte Orientale (Novara)
- 67INFN Sezione di Trieste, Università di Trieste, Trieste, Italy
- 67aINFN Sezione di Trieste
- 67bUniversità di Trieste
- 68Kangwon National University, Chunchon, Korea
- 69Kyungpook National University, Daegu, Korea
- 70Chonnam National University, Institute for Universe and Elementary Particles, Kwangju, Korea
- 71Korea University, Seoul, Korea
- 72University of Seoul, Seoul, Korea
- 73Sungkyunkwan University, Suwon, Korea
- 74Vilnius University, Vilnius, Lithuania
- 75Centro de Investigacion y de Estudios Avanzados del IPN, Mexico City, Mexico
- 76Universidad Iberoamericana, Mexico City, Mexico
- 77Benemerita Universidad Autonoma de Puebla, Puebla, Mexico
- 78Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico
- 79University of Auckland, Auckland, New Zealand
- 80University of Canterbury, Christchurch, New Zealand
- 81National Centre for Physics, Quaid-I-Azam University, Islamabad, Pakistan
- 82Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Warsaw, Poland
- 83Soltan Institute for Nuclear Studies, Warsaw, Poland
- 84Laboratório de Instrumentação e Física Experimental de Partículas, Lisboa, Portugal
- 85Joint Institute for Nuclear Research, Dubna, Russia
- 86Petersburg Nuclear Physics Institute, Gatchina (St Petersburg), Russia
- 87Institute for Nuclear Research, Moscow, Russia
- 88Institute for Theoretical and Experimental Physics, Moscow, Russia
- 89Moscow State University, Moscow, Russia
- 90P.N. Lebedev Physical Institute, Moscow, Russia
- 91State Research Center of Russian Federation, Institute for High Energy Physics, Protvino, Russia
- 92University of Belgrade, Faculty of Physics and Vinca Institute of Nuclear Sciences, Belgrade, Serbia
- 93Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain
- 94Universidad Autónoma de Madrid, Madrid, Spain
- 95Universidad de Oviedo, Oviedo, Spain
- 96Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander, Spain
- 97CERN, European Organization for Nuclear Research, Geneva, Switzerland
- 98Paul Scherrer Institut, Villigen, Switzerland
- 99Institute for Particle Physics, ETH Zurich, Zurich, Switzerland
- 100Universität Zürich, Zurich, Switzerland
- 101National Central University, Chung-Li, Taiwan
- 102National Taiwan University (NTU), Taipei, Taiwan
- 103Cukurova University, Adana, Turkey
- 104Middle East Technical University, Physics Department, Ankara, Turkey
- 105Bogazici University, Istanbul, Turkey
- 106National Scientific Center, Kharkov Institute of Physics and Technology, Kharkov, Ukraine
- 107University of Bristol, Bristol, United Kingdom
- 108Rutherford Appleton Laboratory, Didcot, United Kingdom
- 109Imperial College, London, United Kingdom
- 110Brunel University, Uxbridge, United Kingdom
- 111Baylor University, Waco, USA
- 112Boston University, Boston, USA
- 113Brown University, Providence, USA
- 114University of California, Davis, Davis, USA
- 115University of California, Los Angeles, Los Angeles, USA
- 116University of California, Riverside, Riverside, USA
- 117University of California, San Diego, La Jolla, USA
- 118University of California, Santa Barbara, Santa Barbara, USA
- 119California Institute of Technology, Pasadena, USA
- 120Carnegie Mellon University, Pittsburgh, USA
- 121University of Colorado at Boulder, Boulder, USA
- 122Cornell University, Ithaca, USA
- 123Fairfield University, Fairfield, USA
- 124Fermi National Accelerator Laboratory, Batavia, USA
- 125University of Florida, Gainesville, USA
- 126Florida International University, Miami, USA
- 127Florida State University, Tallahassee, USA
- 128Florida Institute of Technology, Melbourne, USA
- 129University of Illinois at Chicago (UIC), Chicago, USA
- 130The University of Iowa, Iowa City, USA
- 131Johns Hopkins University, Baltimore, USA
- 132The University of Kansas, Lawrence, USA
- 133Kansas State University, Manhattan, USA
- 134Lawrence Livermore National Laboratory, Livermore, USA
- 135University of Maryland, College Park, USA
- 136Massachusetts Institute of Technology, Cambridge, USA
- 137University of Minnesota, Minneapolis, USA
- 138University of Mississippi, University, USA
- 139University of Nebraska-Lincoln, Lincoln, USA
- 140State University of New York at Buffalo, Buffalo, USA
- 141Northeastern University, Boston, USA
- 142Northwestern University, Evanston, USA
- 143University of Notre Dame, Notre Dame, USA
- 144The Ohio State University, Columbus, USA
- 145Princeton University, Princeton, USA
- 146University of Puerto Rico, Mayaguez, USA
- 147Purdue University, West Lafayette, USA
- 148Purdue University Calumet, Hammond, USA
- 149Rice University, Houston, USA
- 150University of Rochester, Rochester, USA
- 151The Rockefeller University, New York, USA
- 152Rutgers, the State University of New Jersey, Piscataway, USA
- 153University of Tennessee, Knoxville, USA
- 154Texas A&M University, College Station, USA
- 155Texas Tech University, Lubbock, USA
- 156Vanderbilt University, Nashville, USA
- 157University of Virginia, Charlottesville, USA
- 158Wayne State University, Detroit, USA
- 159University of Wisconsin, Madison, USA
- aFull author list given at the end of the article.
- bDeceased.
- cAlso at CERN, European Organization for Nuclear Research, Geneva, Switzerland.
- dAlso at Universidade Federal do ABC, Santo Andre, Brazil.
- eAlso at Laboratoire Leprince-Ringuet, Ecole Polytechnique, IN2P3-CNRS, Palaiseau, France.
- fAlso at Suez Canal University, Suez, Egypt.
- gAlso at Fayoum University, El-Fayoum, Egypt.
- hAlso at Soltan Institute for Nuclear Studies, Warsaw, Poland.
- iAlso at Massachusetts Institute of Technology, Cambridge, MA, USA.
- jAlso at Université de Haute-Alsace, Mulhouse, France.
- kAlso at Brandenburg University of Technology, Cottbus, Germany.
- lAlso at Moscow State University, Moscow, Russia.
- mAlso at Institute of Nuclear Research ATOMKI, Debrecen, Hungary.
- nAlso at Eötvös Loránd University, Budapest, Hungary.
- oAlso at Tata Institute of Fundamental Research - HECR, Mumbai, India.
- pAlso at University of Visva-Bharati, Santiniketan, India.
- qAlso at Facoltà Ingegneria Università di Roma “La Sapienza”, Roma, Italy.
- rAlso at Università della Basilicata, Potenza, Italy.
- sAlso at California Institute of Technology, Pasadena, USA.
- tAlso at Faculty of Physics of University of Belgrade, Belgrade, Serbia.
- uAlso at University of California, Los Angeles, Los Angeles, USA.
- vAlso at University of Florida, Gainesville, USA.
- wAlso at Université de Genève, Geneva, Switzerland.
- xAlso at Scuola Normale e Sezione dell’ INFN, Pisa, Italy.
- yAlso at INFN Sezione di Roma, Università di Roma “La Sapienza”, Roma, Italy.
- zAlso at University of Athens, Athens, Greece.
- aaAlso at The University of Kansas, Lawrence, USA.
- bbAlso at Institute for Theoretical and Experimental Physics, Moscow, Russia.
- ccAlso at Paul Scherrer Institut, Villigen, Switzerland.
- ddAlso at University of Belgrade, Faculty of Physics and Vinca Institute of Nuclear Sciences, Belgrade, Serbia.
- eeAlso at Gaziosmanpasa University, Tokat, Turkey.
- ffAlso at Adiyaman University, Adiyaman, Turkey.
- ggAlso at Mersin University, Mersin, Turkey.
- hhAlso at Izmir Institute of Technology, Izmir, Turkey.
- iiAlso at Kafkas University, Kars, Turkey.
- jjAlso at Suleyman Demirel University, Isparta, Turkey.
- kkAlso at Ege University, Izmir, Turkey.
- llAlso at Rutherford Appleton Laboratory, Didcot, United Kingdom.
- mmAlso at School of Physics and Astronomy, University of Southampton, Southampton, United Kingdom.
- nnAlso at INFN Sezione di Perugia, Università di Perugia, Perugia, Italy.
- ooAlso at KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary.
- ppAlso at Institute for Nuclear Research, Moscow, Russia.
- qqAlso at Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH), Bucharest, Romania.
Phys. Rev. Lett. 106, 201802 – Published 17 May, 2011
DOI: https://doi.org/10.1103/PhysRevLett.106.201802
Abstract
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 . The data sample used corresponds to an integrated luminosity of 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 as a function of the leptoquark mass, where 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 , which is the most stringent direct limit to date.
See Also
Search for Pair Production of Second-Generation Scalar Leptoquarks in Collisions at
Article Text
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