# Search for $WW$ $\gamma$ and $WZ$ $\gamma$ production and constraints on anomalous quartic gauge couplings in $pp$ collisions at $\sqrt{s}=8\text{ }\text{ }\mathrm{TeV}$

CMS Collaboration; Canelli, M F; Chiochia, V; Kilminster, B; Robmann, P; et al (2014). Search for $WW$ $\gamma$ and $WZ$ $\gamma$ production and constraints on anomalous quartic gauge couplings in $pp$ collisions at $\sqrt{s}=8\text{ }\text{ }\mathrm{TeV}$. Physical Review D (Particles, Fields, Gravitation and Cosmology), 90(032008):online.

## Abstract

A search for $WV$ $\gamma$ triple vector boson production is presented based on events containing a $W$ boson decaying to a muon or an electron and a neutrino, a second $V$ ($W$ or $Z$) boson, and a photon. The data correspond to an integrated luminosity of $19.3\text{ }\text{ }{\mathrm{fb}}^{$-${}1}$ collected in 2012 with the CMS detector at the LHC in $pp$ collisions at $\sqrt{s}=8\text{ }\text{ }\mathrm{TeV}$. An upper limit of 311 fb on the cross section for the $WV$ $\gamma$ production process is obtained at 95% confidence level for photons with a transverse energy above 30 GeV and with an absolute value of pseudorapidity of less than 1.44. This limit is approximately a factor of 3.4 larger than the standard model predictions that are based on next-to-leading order QCD calculations. Since no evidence of anomalous $WW$$\gamma or WWZ \gamma quartic gauge boson couplings is found, this paper presents the first experimental limits on the dimension-eight parameter {f}_{T,0} and the CP-conserving WWZ \gamma parameters {\kappa{}}_{0}^{W} and {\kappa{}}_{C}^{W}. Limits are also obtained for the WW \gamma$$\gamma$ parameters ${a}_{0}^{W}$ and ${a}_{C}^{W}$.

## Abstract

A search for $WV$ $\gamma$ triple vector boson production is presented based on events containing a $W$ boson decaying to a muon or an electron and a neutrino, a second $V$ ($W$ or $Z$) boson, and a photon. The data correspond to an integrated luminosity of $19.3\text{ }\text{ }{\mathrm{fb}}^{$-${}1}$ collected in 2012 with the CMS detector at the LHC in $pp$ collisions at $\sqrt{s}=8\text{ }\text{ }\mathrm{TeV}$. An upper limit of 311 fb on the cross section for the $WV$ $\gamma$ production process is obtained at 95% confidence level for photons with a transverse energy above 30 GeV and with an absolute value of pseudorapidity of less than 1.44. This limit is approximately a factor of 3.4 larger than the standard model predictions that are based on next-to-leading order QCD calculations. Since no evidence of anomalous $WW$$\gamma or WWZ \gamma quartic gauge boson couplings is found, this paper presents the first experimental limits on the dimension-eight parameter {f}_{T,0} and the CP-conserving WWZ \gamma parameters {\kappa{}}_{0}^{W} and {\kappa{}}_{C}^{W}. Limits are also obtained for the WW \gamma$$\gamma$ parameters ${a}_{0}^{W}$ and ${a}_{C}^{W}$.

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## Additional indexing

Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2014 24 Feb 2015 15:27 08 Dec 2017 11:53 American Physical Society 1550-2368 https://doi.org/10.1103/PhysRevD.90.032008

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