Electroweak results at LHCb

Abstract

$W$ and $Z$ production cross-sections have been measured in proton-proton collisions at a center-of-mass energy of 7 TeV using the decays $W\to \mu \nu$, $Z\to \mu \mu$ and $Z\to \tau \tau$ collected by the LHCb detector. For all the measurements at least one of the reconstructed muons has a transverse momentum, $p_T$, above 20 GeV/$c$ and a pseudorapidity, $\eta$, between 2 and 4.5. In the case of the $Z$, a di-muon invariant mass between 60 GeV$/c^2$ and 120 GeV$/c^2$ is required. Theoretical predictions, calculated at next-to-next-to-leading order in QCD using recent parton distribution functions (PDFs), are found to be in agreement with the measurements.

arXiv commentPresented at the 2011 Hadron Collider Physics symposium (HCP-2011), Paris, France, November 14-18 2011, 4 pages, 8 figures