Article

# Measurements of inclusive W and Z cross sections in pp collisions at √s = 7 TeV

Academy of Scientific Research and Technology of the Arab Republic of Egypt, Egyptian Network of High Energy Physics, Cairo, Egypt; Università di Bari, Bari, Italy; Politecnico di Bari, Bari, Italy; Università di Bologna, Bologna, Italy; Università di Catania, Catania, Italy; Università di Firenze, Firenze, Italy; Università di Milano-Bicocca, Milano, Italy; Università di Napoli “Federico II”, Napoli, Italy; Università di Padova, Padova, Italy; Università di Trento (Trento), Padova, Italy; Università di Pavia, Pavia, Italy; Università di Perugia, Perugia, Italy; Università di Pisa, Pisa, Italy; Scuola Normale Superiore di Pisa, Pisa, Italy; Università di Roma “La Sapienza”, Roma, Italy; INFN Sezione di Torino, Torino, Italy; Università di Torino, Torino, Italy; Università del Piemonte Orientale (Novara), Torino, Italy; INFN Sezione di Trieste, Trieste, Italy; Università di Trieste, Trieste, Italy; Kangwon National University, Chunchon, Korea; Kyungpook National University, Daegu, Korea; Chonnam National University, Institute for Universe and Elementary Particles, Kwangju, Korea; Korea University, Seoul, Korea; University of Seoul, Seoul, Korea
Journal of High Energy Physics (Impact Factor: 5.62). 01/2011; 2011(1):080. DOI:10.1007/JHEP01(2011)080

ABSTRACT Measurements of inclusive W and Z boson production cross sections in pp collisions at Ös = 7 \sqrt {s} = 7 TeV are presented, based on 2.9 pb−1 of data recorded by the CMS detector at the LHC. The measurements, performed in the electron and muon decay channels, are
combined to give

s( \textpp ® \textWX ) B( \textW ® ln ) = 9.95±0.07( \textstat. )±0.28( \textsyst. )±1.09 \sigma \left( {{\text{pp}} \to {\text{W}}X} \right) \times \mathcal{B}\left( {{\text{W}} \to \ell \nu } \right) = 9.95\pm 0.07\left( {{\text{stat}}{.}} \right)\pm 0.28\left( {{\text{syst}}{.}} \right)\pm 1.09 (lumi.) nb and

s( \textpp ® \textZX ) B( Z ® l+ l- ) = 0.931±0.026( \textstat. )±0.023( \textsyst. )±0.102 \sigma \left( {{\text{pp}} \to {\text{Z}}X} \right) \times \mathcal{B}\left( {Z \to {\ell^{+} }{\ell^{-} }} \right) = 0.931\pm 0.026\left( {{\text{stat}}{.}} \right)\pm 0.023\left( {{\text{syst}}{.}} \right)\pm 0.102 (lumi.) nb, where ℓ stands for either e or μ. Theoretical predictions, calculated at the next-to-next-to-leading order in QCD using recent parton distribution functions,
are in agreement with the measured cross sections. Ratios of cross sections, which incur an experimental systematic uncertainty
of less than 4%, are also reported.

0 0
·
4 Bookmarks
·
162 Views
• Source
##### Article: Measurement of the charge ratio of atmospheric muons with the CMS detector
Physics Letters B 08/2010; 692(2):83. · 4.57 Impact Factor
• Source
##### Article: Parton Distributions for the LHC
[hide abstract]
ABSTRACT: We present a preliminary set of updated NLO parton distributions. For the first time we have a quantitative extraction of the strange quark and antiquark distributions and their uncertainties determined from CCFR and NuTeV dimuon cross sections. Additional jet data from HERA and the Tevatron improve our gluon extraction. Lepton asymmetry data and neutrino structure functions improve the flavour separation, particularly constraining the down quark valence distribution.
European Physical Journal C 07/2007; · 5.25 Impact Factor
• Source
##### Article: Electroweak gauge boson production at hadron colliders through O(Î±{sub s}Â²)
[hide abstract]
ABSTRACT: We describe a calculation of the O(Î±{sub s}Â²) QCD corrections to the fully differential cross section for W and Z boson production in hadronic collisions. The result is fully realistic in that it includes spin correlations, finite width effects, Î³-Z interference and allows for the application of arbitrary cuts on the leptonic decay products of the W and Z. We have implemented this calculation into a numerical program. We demonstrate the use of this code by presenting phenomenological results for several future LHC analyses and recent Tevatron measurements, including the W cross section in the forward rapidity region and the central over forward cross section ratio.
Physical review D: Particles and fields 01/2006; 74(11):114017-114017.