Measurement of the sum of WW and WZ production with W+dijet events in pp collisions at sqrt(s) = 7 TeV

TL;DR

This paper reports the first measurement of the combined WW and WZ production cross section in proton-proton collisions at 7 TeV, using W+dijet events, and finds results consistent with the Standard Model predictions.

Contribution

It provides the first measurement of WW+WZ production in pp collisions with this specific signature, setting limits on anomalous gauge couplings.

Findings

Measured cross section: 68.9 pb with uncertainties

Results consistent with Standard Model predictions

No evidence for anomalous triple gauge couplings

Abstract

A measurement of the inclusive WW+WZ diboson production cross section in proton-proton collisions is reported, based on events containing a leptonically decaying W boson and exactly two jets. The data sample, collected at sqrt(s) = 7 TeV with the CMS detector at the LHC, corresponds to an integrated luminosity of 5.0 inverse femtobarns. The measured value of the sum of the inclusive WW and WZ cross sections is sigma(pp to WW+WZ) = 68.9 +/- 8.7 (stat.) +/- 9.7 (syst.) +/- 1.5 (lum.) pb, consistent with the standard model prediction of 65.6 +/- 2.2 pb. This is the first measurement of WW+WZ production in pp collisions using this signature. No evidence for anomalous triple gauge couplings is found and upper limits are set on their magnitudes.