Abstract: A search for exclusive or quasi-exclusive W+W? production by photon-photon interactions, pp ? p(*)W+W?p(*), at s?=7 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 ? ±e? vertex with no additional associated charged tracks and dilepton transverse momentum p T(? ±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 aW0,C/?2 with a dipole form factor and an energy cutoff ?cutoff?=?500 GeV are of the order of 10?4.

Autoría

Descargar referencia