Measurement of Wγγ Cross Section and Limits on Anomalous Quartic Gauge Couplings in Proton-Proton Collisions at 8 TeV with the CMS detector

Abstract

Present the measurement of a rare Standard Model processes, pp →W±γγ

for the leptonic decays of the W±. The measurement is made with 19.4 fb−1 of

8 TeV data collected in 2012 by the CMS experiment. The measured cross section

is consistent with the Standard Model prediction and has a significance of 2.9σ.

Limits are placed on dimension-8 Effective Field Theories of anomalous Quartic

Gauge Couplings. The analysis has particularly sensitivity to the fT,0 coupling and

a 95% confidence limit is placed at −35.9 < fT,0/Λ4< 36.7 TeV−4. Studies of the

pp →Zγγ process are also presented. The Zγγ signal is in strict agreement with the Standard Model and has a significance of 5.9σ.