Abstract

We present studies of diboson and triboson production in pp collisions based on data recorded by the CMS detector at the LHC. These include precise measurements the production cross section of these processes at center-of-mass energies of 8 and 13 TeV. Final states where one or more photons are produced in association of W and Z bosons, reconstructed through their decay products, are used. The results are interpreted in terms of constraints on anomalous triple and quartic gauge couplings.

Highlights

  • Multiboson final states provide a broad perspective on the Standard Model

  • The higher center-of-mass energy as well as the integrated luminosity of the LHC allow stringent limits to be placed on new physics that could appear as anomalous modifications of gauge couplings

  • If the energy scale of new physics is just beyond the reach of the LHC such that new particles cannot be produced as a resonance, effects from the new physics may appear in the high energy tails of standard model processes

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Summary

Introduction

Multiboson final states provide a broad perspective on the Standard Model. Final states including photons – the focus of this note – are unique probes of both the Standard Model and new physics. Photons participate in the electroweak sector, but unlike the W and Z bosons, photons provide clean experimental signatures without incurring reductions in the signal from additional branching fractions. Precision cross section measurements are made using high-rate multiboson processes. Multiboson final states access very rare standard model processes In multiboson final states that are newly accessible with the large integrated luminosity of the LHC. The higher center-of-mass energy as well as the integrated luminosity of the LHC allow stringent limits to be placed on new physics that could appear as anomalous modifications of gauge couplings. A summary of CMS measurements of these processes as well as others can be found here

Effective field theory for anomalous gauge couplings
Results from CMS
TeV 13 TeV
Conclusion
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