Search for anomalous quartic WW gamma gamma couplings in dielectron and missing energy final states in p(p)over-bar collisions at root s 1.96 TeV
Abstract
We present a search for anomalous components of the quartic gauge boson coupling WW gamma gamma in events with an electron, a positron and missing transverse energy. The analyzed data correspond to 9.7 fb(-1) of integrated luminosity collected by the D0 detector in p (p) over bar collisions at root s 1.96 TeV.
The presence of anomalous quartic gauge couplings would manifest itself as an excess of boosted WW events. No such excess is found in the data, and we set the most stringent limits to date on the anomalous coupling parameters a(0)(W) and a(C)(W).
When a form factor with Lambda(cutoff) = 0.5 TeV is used, the observed upper limits at 95% C. L. are vertical bar a(0)(W)/Lambda(2)vertical bar < 0.0025 GeV-2 and vertical bar a(C)(W)/Lambda(2)vertical bar < 0.0092 GeV-2.