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Measurement of the forward W boson cross-section in pp collisions at root s = 7 TeV

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  • R. Aaij
  • B. Adeva
  • M. Adinolfi
  • A. Affolder
  • Z. Ajaltouni
  • S. Akar
  • J. Albrecht
  • F. Alessio
  • M. Alexander
  • S. Ali
  • G. Alkhazov
  • P. Alvarez Cartelle
  • A. A. Alves
  • S. Amato
  • S. Amerio
  • Y. Amhis
  • L. An
  • L. Anderlini
  • J. Anderson
  • R. Andreassen
  • M. Andreotti
  • J. E. Andrews
  • R. B. Appleby
  • O. Aquines Gutierrez
  • F. Archilli
  • A. Artamonov
  • M. Artuso
  • E. Aslanides
  • G. Auriemma
  • M. Baalouch
  • S. Bachmann
  • J. J. Back
  • A. Badalov
  • W. Baldini
  • R. J. Barlow
  • C. Barschel
  • S. Barsuk
  • W. Barter
  • V. Batozskaya
  • V. Battista
  • A. Bay
  • Laurence Carson
  • P. E. L. Clarke
  • G. A. Cowan
  • Daniel Craik
  • S. Eisenhardt
  • Silvia Gambetta
  • F. Muheim
  • M. Needham
  • S. Playfer
  • LHCb Collaboration

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Original languageEnglish
Article number079
Pages (from-to)079
Number of pages25
JournalJournal of High Energy Physics
Issue number12
Publication statusPublished - 10 Dec 2014


A measurement of the inclusive W -> mu nu production cross-section using data from pp collisions at a centre-of-mass energy of root s=7 TeV is presented. The analysis is based on an integrated luminosity of about 1.0 fb(-1) recorded with the LHCb detector. Results are reported for muons with a transverse momentum greater than 20 GeV/c and pseudorapidity between 2.0 and 4.5. The W+ and W- production cross-sections are measured to be

sigma(W+->mu+nu)=861.0 +/- 2.0 +/- 11.2 +/- 14.7pb,

sigma(W-->mu-(nu)over bar)=675.8 +/- 1.9 +/- 8.8 +/- 11.6pb,

where the first uncertainty is statistical, the second is systematic and the third is due to the luminosity determination. Cross-section ratios and differential distributions as functions of the muon pseudorapidity are also presented. The ratio of W+ to W- cross-sections in the same fiducial kinematic region is determined to be

sigma(W+->mu+nu)/sigma(W-->mu-(nu)over bar) = 1.274 +/- 0.005 +/- 0.009,

where the uncertainties are statistical and systematic, respectively. Results are in good agreement with theoretical predictions at next-to-next-to-leading order in perturbative quantum chromodynamics.

    Research areas

  • Hadron-Hadron Scattering, QCD, Forward physics, YAN K-FACTOR, PARTON DISTRIBUTIONS, MONTE-CARLO, DECAY, ORDER, LHC

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