Abstract
$W^+ W^-$ production is one of the golden channels for testing the Standard Model as well for searches beyond the Standard Model. We discuss many new subleading processes for inclusive production of $W^+ W^-$ pairs generally not included in the litterature so far. We focus mainly on photon-photon induced processes. We include elastic-elastic, elastic-inelastic, inelastic-elastic and inelastic-inelastic contributions. We also calculate the contributions with resolved photons including the partonic substructure of the virtual photon. Predictions for the total cross section and differential distributions in $W$- boson rapidity and transverse momentum as well as $WW$ invariant mass are presented. The $\gamma \gamma$ components only constitute about 1-2 \% of the inclusive $W^+ W^-$ cross section but increases up to about 10 \% at large $W^{\pm}$ transverse momenta, and are even comparable to the dominant $q \bar q$ component at large $M_{WW}$, i.e. are much larger than the $g g \to W^+ W^-$ one.
Highlights
The Standard Model predictions do not include several potentially important subleading processes, and this is the aim of this paper to compute the usually missing processes in the literature leading to pairs of W s in the final state
The cross section for double parton scattering is often modelled in the factorized anzatz which in our case would mean: σWDP+SW −
Before a detailed survey of results of the different contributions discussed in the present paper, let us concentrate on some technical details concerning inelastic photon-photon contributions
Summary
We review all processes leading to pairs of W s in the final state. we discuss a basic ingredient to produce W pairs exclusively via photon exchanges. The corresponding triple differential cross section for inelastic-inelastic photon-photon contribution can be written as usually in the parton-model formalism: dσγinγin dy1dy2d2pt x1γin(x1, μ2). In the following the elastic photon fluxes are calculated using the Drees-Zeppenfeld parametrization [21], where a simple parametrization of the nucleon electromagnetic form factors is used Such an approach is consistent with the partonic approach used recently to estimate the electroweak corrections to different QCD processes. In the case of resolved photons, the “photonic” quark/antiquark distributions in a proton must be calculated first This can be done as the convolution fqγ/p = fγ/p ⊗ fq/γ (2.15). An average value of the gap survival probability < |S|2 > is calculated first and the cross sections for different processes are multiplied by this value We shall follow this somewhat simplified approach. The absorptive corrections for single and central diffractive processes could be somewhat different
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