Measurement of the $WW+WZ$ cross section and limits on anomalous triple gauge couplings using final states with one lepton, missing transverse momentum, and two jets with the ATLAS detector at $\sqrt{\mathrm{s}}=7$ TeV

Abstract

The production of a $W$ boson decaying to $e\nu$ or $\mu \nu$ in association with a $W$ or $Z$ boson decaying to two jets is studied using $4.6{\mathrm{fb}}^{-1}$ of proton--proton collision data at $\sqrt{\mathrm{s}}=7$ TeV recorded with the ATLAS detector at the LHC. The combined $WW+WZ$ cross section is measured with a significance of 3.4$\sigma$ and is found to be $68\pm 7(stat.)\pm 19(syst.)pb$, in agreement with the Standard Model expectation of $61.1\pm 2.2\mathrm{pb}$. The distribution of the transverse momentum of the dijet system is used to set limits on anomalous contributions to the triple gauge coupling vertices and on parameters of an effective-field-theory model.

arXiv comment25 pages + author list + cover page (49 total), 5 tables, 7 figures. Submitted to JHEP, all figures can be found at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2012-22/

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• Search for anomalous couplings in boosted WW/WZ to l nu q q-bar production in proton-proton collisions at sqrt(s) = 8 TeV
• Measurement of the inclusive and differential WZ production cross sections, polarization angles, and triple gauge couplings in pp collisions at $\sqrt{s}=$ 13 TeV
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• CP-Violation in the $ZZZ$ and $ZWW$ vertices at $e^{+}{e}^{-}$ colliders in Two-Higgs-Doublet Models
• $W^{+}{W}^{-}$ production at NNLO+PS with MiNNLO${}_{\mathrm{PS}}$
• Measurement of $WW/WZ\to \ell \nu q{q}^{\prime }$ production with the hadronically decaying boson reconstructed as one or two jets in $pp$ collisions at $\sqrt{s}=8$ TeV with ATLAS, and constraints on anomalous gauge couplings
• Golden Probe of the Top Yukawa
• Status and prospects of precision analyses with $e^{+}{e}^{-}\to W^{+}{W}^{-}$
• Next-to-leading order predictions for WW+jet production
• A new method to distinguish hadronically decaying boosted $Z$ bosons from $W$ bosons using the ATLAS detector
• Measurement of the $WW$ and $WZ$ production cross section using final states with a charged lepton and heavy-flavor jets in the full CDF Run II data set
• Detecting quark anomalous electroweak couplings at the LHC