Measurement of the W$\gamma$ production cross section in proton-proton collisions at $\sqrt{s}=$ 13 TeV and constraints on effective field theory coefficients

Abstract

A fiducial cross section for W$\gamma$ production in proton-proton collisions is measured at a center-of-mass energy of 13 TeV in 137 fb${}^{-1}$ of data collected using the CMS detector at the LHC. The W $\to$ e$\nu$ and $\mu \nu$ decay modes are used in a maximum-likelihood fit to the lepton-photon invariant mass distribution to extract the combined cross section. The measured cross section is compared with theoretical expectations at next-to-leading order in quantum chromodynamics. In addition, 95% confidence level intervals are reported for anomalous triple-gauge couplings within the framework of effective field theory.

arXiv commentReplaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/SMP-19-002 (CMS Public Pages)

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• Sensitivity to New Physics in final states with multiple gauge and Higgs bosons
• Role of polarizations and spin-spin correlations of $W^{\prime }s$ in $e^{-}{e}^{+}\to W^{-}{W}^{+}$ at $\sqrt{s}=250$ GeV to probe anomalous $W^{-}{W}^{+}Z/\gamma$ couplings
• New physics in $WW\gamma$ at one loop via Majorana neutrinos
• Investigation of anomalous triple gauge couplings in $\mu \gamma$ collision at multi-TeV muon colliders
• Observation of WZ$\gamma$ production and constraints on new physics scenarios in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• $W\gamma$ production at NNLO+PS accuracy in GENEVA