Elsevier

Physics Letters B

Volume 701, Issue 1, 27 June 2011, Pages 31-49
Physics Letters B

Measurement of the W charge asymmetry in the Wμν decay mode in pp collisions at s=7TeV with the ATLAS detector

https://doi.org/10.1016/j.physletb.2011.05.024Get rights and content
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Abstract

This Letter reports a measurement of the muon charge asymmetry from W bosons produced in proton–proton collisions at a centre-of-mass energy of 7 TeV with the ATLAS experiment at the LHC. The asymmetry is measured in the Wμν decay mode as a function of the muon pseudorapidity using a data sample corresponding to a total integrated luminosity of 31pb1. The results are compared to predictions based on next-to-leading order calculations with various parton distribution functions. This measurement provides information on the u and d quark momentum fractions in the proton.

Keywords

W production
Charge asymmetry
Parton distribution function
Muon decay mode

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

d

Also at TRIUMF, Vancouver BC, Canada.

e

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

f

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

g

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

h

Also at Università di Napoli Parthenope, Napoli, Italy.

i

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

j

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

k

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

l

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

m

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

n

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

o

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

p

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

q

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

r

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

s

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

t

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

u

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

v

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

w

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

x

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

y

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

z

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

aa

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

ab

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

Deceased.