@article{b0d37b6d54a5445b9906e83f029391a8, title = "Measurement of the forward W boson cross-section in pp collisions at root s = 7 TeV", abstract = "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 besigma(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 besigma(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.", keywords = "Hadron-Hadron Scattering, QCD, Forward physics, YAN K-FACTOR, PARTON DISTRIBUTIONS, MONTE-CARLO, DECAY, ORDER, LHC", author = "R. Aaij and B. Adeva and M. Adinolfi and A. Affolder and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and S. Ali and G. Alkhazov and Cartelle, {P. Alvarez} and Alves, {A. A.} and S. Amato and S. Amerio and Y. Amhis and L. An and L. Anderlini and J. Anderson and R. Andreassen and M. Andreotti and Andrews, {J. E.} and Appleby, {R. B.} and Gutierrez, {O. Aquines} and F. Archilli and A. Artamonov and M. Artuso and E. Aslanides and G. Auriemma and M. Baalouch and S. Bachmann and Back, {J. J.} and A. Badalov and W. Baldini and Barlow, {R. J.} and C. Barschel and S. Barsuk and W. Barter and V. Batozskaya and V. Battista and A. Bay and Laurence Carson and Clarke, {P. E. L.} and Cowan, {G. A.} and Daniel Craik and S. Eisenhardt and Silvia Gambetta and F. Muheim and M. Needham and S. Playfer and {LHCb Collaboration}", year = "2014", month = dec, day = "10", doi = "10.1007/JHEP12(2014)079", language = "English", volume = "1412", pages = "079", journal = " Journal of High Energy Physics", issn = "1126-6708", publisher = "Springer-Verlag", number = "12", }