Probing theWWγvertex at hadron colliders

Abstract

We present a new, model independent method for extracting bounds for the anomalous $\ensuremath{\gamma}\mathrm{WW}$ couplings from hadron collider experiments. At the partonic level we introduce a set of three observables which are constructed from the unpolarized differential cross section for the process $d\stackrel{\ensuremath{\rightarrow}}{\ifmmode \bar{u}\else \={u}\fi{}}{W}^{\ensuremath{-}}\ensuremath{\gamma}$ by appropriate convolution with a set of simple polynomials depending only on the center-of-mass angle. One of these observables allows for the direct determination of the anomalous coupling usually denoted by $\ensuremath{\Delta}\ensuremath{\kappa},$ without any simplifying assumptions, and without relying on the presence of a radiation zero. The other two observables impose two sum rules on the remaining three anomalous couplings. The inclusion of the structure functions is discussed in detail for both $p\overline{p}$ and $\mathrm{pp}$ colliders. We show that, whilst for $p\overline{p}$ experiments this can be accomplished straightforwardly, in the $\mathrm{pp}$ case one has to resort to somewhat more elaborate techniques, such as the binning of events according to their longitudinal momenta.