Measurement of W ± Z production in proton-proton collisions at $\sqrt{s}=7~\mbox{TeV}$ with the ATLAS detector

Abstract

A study of W ± Z production in proton-proton collisions at √ s = 7 TeV is presented using data corresponding to an integrated luminosity of 4.6 fb −1 collected with the ATLAS detector at the Large Hadron Collider in 2011. In total, 317 candidates, with a background expectation of 68 ± 10 events, are observed in double-leptonic decay final states with electrons, muons and missing transverse momentum. The total cross-section is determined to be σ tot W Z = 19.0

Two-loop planar master integrals for the production of off-shell vector bosons in hadron collisions

“…Production of pairs of vector bosons in hadron collisions is an important process that is used by ATLAS and CMS collaborations to study QCD dynamics, understand fine details of electroweak interactions and validate Monte Carlo event generators that are employed for estimating backgrounds in searches for physics beyond the Standard Model [2][3][4][5][6]. For this reason, high-quality theoretical predictions for these processes are warranted.…”

“…The first one is related to persistent and significant discrepancies between theoretical predictions and measured cross-sections and kinematic distributions for pp → W + W − production, observed both at 7 and at 8 TeV LHC by ATLAS and CMS collaborations [2][3][4][5][6]. It is important to compute NNLO QCD corrections to this process in order to exclude them once and for all as a potential reason for that discrepancy.…”

Evidence ofWγγProduction inppCollisions ats=8 TeVAad1, Abbott2, Abdallah3 et al. 2015Phys. Rev. Lett.Self Cite390342View full textAdd to dashboardCite

“…Limits on AQGC parameters are set in the exclusive phase space with a diphoton mass larger than 300 GeV. Total and differential cross sections for the diboson production processes WW, WZ, ZZ, Wγ, and Zγ have been reported previously by the ATLAS [2][3][4][5], CMS [6][7][8], D0 [9][10][11], and CDF [12][13][14] Collaborations, including limits on anomalous triple gauge boson couplings. Limits have been set on AQGCs by ATLAS [15], CMS [16,17], the LEP experiments [18][19][20][21], and D0 [22].…”

Measurement of the sum of WW and WZ production with W+dijet events in pp collisions at $\sqrt{s} = 7\ \mbox{TeV}$

“…[37, 43–46]. The ATLAS Collaboration recently reported limits in the fully leptonic channel for WZ [7] and WW [8] production. Limits obtained from fully leptonic channels are weaker due to the smaller branching fractions.…”