Artigo
Search for Pair Production of First-Generation Scalar Leptoquarks in pp Collisions at root s=7 TeV
Fecha
2011-05-17Registro en:
Physical Review Letters. College Pk: Amer Physical Soc, v. 106, n. 20, p. 15, 2011.
0031-9007
10.1103/PhysRevLett.106.201802
WOS:000290729400004
WOS000290729400004.pdf
Autor
Yerevan Phys Inst
Inst Hochenergiephys OeAW
Natl Ctr Particle & High Energy Phys
Univ Antwerp
Vrije Univ Brussel
Univ Libre Brussels
Univ Ghent
Catholic Univ Louvain
Univ Mons
Centro Brasileiro de Pesquisas Físicas (CBPF)
Univ Estado Rio de Janeiro
Rutgers State Univ
Tech Univ Split
Univ Tennessee
Texas A&M Univ
Texas Tech Univ
Vanderbilt Univ
University of Virginia (UVA)
Wayne State Univ
Univ Wisconsin
Izmir Inst Technol
Chonnam Natl Univ
Universidade Federal do ABC (UFABC)
Suez Canal Univ
Fayoum Univ
Univ Split
Brandenburg Tech Univ Cottbus
Rudjer Boskovic Inst
Lab Instrumentacao & Fis Expt Particulas
Kafkas Univ
Suleyman Demirel Univ
Ege Univ
Korea University
Univ Southampton
Horia Hulubei Natl Inst Phys & Nucl Engn IFIN HH
Univ Cyprus
Acad Sci Res & Technol Arab Republ Egypt
NICPB
Univ Helsinki
Helsinki Inst Phys
Joint Inst Nucl Res
Lappeenranta Univ Technol
CNRS
Univ Seoul
CEA Saclay
Ecole Polytech
Univ Haute Alsace Mulhouse
IN2P3
Univ Lyon 1
Georgian Acad Sci
Tbilisi State Univ
RWTH Aachen University
Petersburg Nucl Phys Inst
Sungkyunkwan Univ
DESY
Univ Hamburg
Univ Karlsruhe
Inst Nucl Phys Demokritos
Univ Athens
Univ Ioannina
KFKI Res Inst Particle & Nucl Phys
Inst Nucl Res ATOMKI
Russian Acad Sci
Vilnius Univ
Univ Debrecen
Panjab Univ
University of Delhi
Bhabha Atom Res Ctr
Tata Inst Fundamental Res EHEP
Tata Inst Fundamental Res HECR
Inst Res & Fundamental Sci IPM
Ist Nazl Fis Nucl
Univ Bari
Politecn Bari
IPN
Institute for Theoretical and Experimental Physics (ITEP)
Univ Bologna
Univ Catania
Univ Florence
Univ Iberoamer
Univ Milano Bicocca
Moscow MV Lomonosov State Univ
Univ Naples Federico II
Univ Padua
Univ Trent
Univ Pavia
Benemerita Univ Autonoma Puebla
Univ Perugia
PN Lebedev Phys Inst
Univ Pisa
Scuola Normale Super Pisa
Univ Roma La Sapienza
Univ Turin
Univ Piemonte Orientale Novara
Univ Autonoma San Luis Potosi
Univ Trieste
Kangwon Natl Univ
State Res Ctr Russian Federat
Kyungpook Natl Univ
University of Belgrade
Eotvos Lorand Univ
Univ Auckland
Univ Canterbury
Quaid I Azam Univ
Univ Warsaw
Soltan Inst Nucl Studies
Vinca Inst Nucl Sci
Universidade Estadual Paulista (Unesp)
CIEMAT
Univ Autonoma Madrid
Univ Oviedo
Visva Bharati Univ
Univ Cantabria
CERN
Paul Scherrer Inst
Swiss Fed Inst Technol
Univ Zurich
Natl Cent Univ
Natl Taiwan Univ
Bulgarian Acad Sci
Cukurova Univ
Middle E Tech Univ
Bogazici Univ
Natl Sci Ctr
Univ Bristol
Rutherford Appleton Lab
Univ London Imperial Coll Sci Technol & Med
Brunel Univ
Baylor Univ
Boston University
Univ Sofia
Brown University
Univ Basilicata
Univ Calif Davis
Univ Calif Los Angeles
University of California, Riverside (UCR)
Univ Calif San Diego
Univ Calif Santa Barbara
CALTECH
Carnegie Mellon Univ
Univ Colorado
Cornell Univ
Inst High Energy Phys
Univ Geneva
Fairfield Univ
Fermilab Natl Accelerator Lab
Univ Florida
Florida Int Univ
Florida State University
Florida Inst Technol
Univ Illinois
Univ Iowa
Johns Hopkins Univ
University of Kansas (KU)
Gaziosmanpasa Univ
Peking Univ
Kansas State University
Lawrence Livermore Natl Lab
University of Maryland
MIT
Univ Minnesota
University of Mississippi
Univ Nebraska
SUNY Buffalo
Northeastern University
Adiyaman Univ
Northwestern University (NU)
Universidad de los Andes
Univ Notre Dame
Ohio State Univ
Princeton University
Univ Puerto Rico
Purdue Univ
Purdue University Calumet
Rice University
University of Rochester
Mersin Univ
Rockefeller Univ
Resumen
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 root 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 beta(2) as a function of the leptoquark mass, where beta 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 beta = 1, which is the most stringent direct limit to date.