Journal of High Energy Physics > 2013 > 2013 > 7 > 1-44
Study of exclusive two-photon production of W+W− in pp collisions at TeV and constraints on anomalous quartic gauge couplings
Source
Abstract
A search for exclusive or quasi-exclusive W+W− production by photon-photon interactions, pp → p(*)W+W−p(*), at TeV is reported using data collected by the CMS detector with an integrated luminosity of 5.05 fb−1. Events are selected by requiring a μ ±e∓ vertex with no additional associated charged tracks and dilepton transverse momentum p T(μ ±e∓) > 30 GeV. Two events passing all selection requirements are observed in the data, compared to a standard model expectation of 2.2 ± 0.4 signal events with 0.84 ± 0.15 background. The tail of the dilepton p T distribution is studied for deviations from the standard model. No events are observed with p T > 100 GeV. Model-independent upper limits are computed and compared to predictions involving anomalous quartic gauge couplings. The limits on the parameters with a dipole form factor and an energy cutoff Λcutoff = 500 GeV are of the order of 10−4.
Identifiers
journal e-ISSN : | 1029-8479 |
DOI | 10.1007/JHEP07(2013)116 |