Elsevier

Physics Letters B

Volume 707, Issue 5, 7 February 2012, Pages 418-437
Physics Letters B

Measurement of the cross section for the production of a W boson in association with b-jets in pp collisions at s=7TeV with the ATLAS detector

https://doi.org/10.1016/j.physletb.2011.12.046Get rights and content
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Abstract

A measurement is presented of the cross section for the production of a W boson with one or two jets, of which at least one must be a b-jet, in pp collisions at s=7TeV. Production via top decay is not included in the signal definition. The measurement is based on 35pb1 of data collected with the ATLAS detector at the LHC. The W+b-jet cross section is defined for jets reconstructed with the anti-kt clustering algorithm with transverse momentum above 25 GeV and rapidity within ±2.1. The b-jets are identified by reconstructing secondary vertices. The fiducial cross section is measured both for the electron and muon decay channel of the W boson and is found to be 10.2±1.9(stat)±2.6(syst)pb for one lepton flavour. The results are compared with next-to-leading order QCD calculations, which predict a cross section smaller than, though consistent with, the measured value.

Cited by (0)

© CERN for the benefit of the ATLAS Collaboration.

E-mail address: [email protected].

a

Also at Laboratorio de Instrumentacao e Fisica Experimental de Particulas - LIP, Lisboa, Portugal.

b

Also at Faculdade de Ciencias and CFNUL, Universidade de Lisboa, Lisboa, Portugal.

c

Also at Particle Physics Department, Rutherford Appleton Laboratory, Didcot, United Kingdom.

d

Also at CPPM, Aix-Marseille Université and CNRS/IN2P3, Marseille, France.

e

Also at TRIUMF, Vancouver BC, Canada.

f

Also at Department of Physics, California State University, Fresno CA, United States.

g

Also at Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Krakow, Poland.

h

Also at Fermilab, Batavia IL, United States.

i

Also at Department of Physics, University of Coimbra, Coimbra, Portugal.

j

Also at Università di Napoli Parthenope, Napoli, Italy.

k

Also at Institute of Particle Physics (IPP), Canada.

l

Also at Department of Physics, Middle East Technical University, Ankara, Turkey.

m

Also at Louisiana Tech University, Ruston LA, United States.

n

Also at Group of Particle Physics, University of Montreal, Montreal QC, Canada.

o

Also at Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan.

p

Also at Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany.

q

Also at Manhattan College, New York NY, United States.

r

Also at School of Physics and Engineering, Sun Yat-sen University, Guanzhou, China.

s

Also at Academia Sinica Grid Computing, Institute of Physics, Academia Sinica, Taipei, Taiwan.

t

Also at High Energy Physics Group, Shandong University, Shandong, China.

u

Also at Section de Physique, Université de Genève, Geneva, Switzerland.

v

Also at Departamento de Fisica, Universidade de Minho, Braga, Portugal.

w

Also at Department of Physics and Astronomy, University of South Carolina, Columbia SC, United States.

x

Also at KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary.

y

Also at California Institute of Technology, Pasadena CA, United States.

z

Also at Institute of Physics, Jagiellonian University, Krakow, Poland.

aa

Also at Department of Physics, Oxford University, Oxford, United Kingdom.

ab

Also at Institute of Physics, Academia Sinica, Taipei, Taiwan.

ac

Also at Department of Physics, The University of Michigan, Ann Arbor MI, United States.

ad

Also at DSM/IRFU (Institut de Recherches sur les Lois Fondamentales de lʼUnivers), CEA Saclay (Commissariat a lʼEnergie Atomique), Gif-sur-Yvette, France.

ae

Also at Laboratoire de Physique Nucléaire et de Hautes Energies, UPMC and Université Paris-Diderot and CNRS/IN2P3, Paris, France.

af

Also at Department of Physics, Nanjing University, Jiangsu, China.

Deceased.