Production of $W^+ W^-$ pairs via subleading processes at the LHC

Apr 29, 2014, 11:40 AM



Oral presentation WG3: Electroweak Physics and Beyond the Standard Model WG3: Electroweak Physics and Beyond the Standard Model


Marta Luszczak (University of Rzeszow)


The standard NLO calculations underpredict the measured rates of $W^+ W^-$ production compared to recent ATLAS and CMS experimental data. We discuss new subleading processes for inclusive production of $W^+ W^-$ pairs. We focus on photon-photon induced processes. We include elastic-elastic, elastic-inelastic, inelastic-elastic and inelastic-inelastic contributions. The inelastic photon distributions in the proton are calculated in two different ways: naive approach used already in the literature and using photon distributions by solving special evolution equation with photon being a parton in the proton. The results strongly depend on the approach used. We calculate also contributions with resolved photons. %The diffractive components have similar characteristics as %the photon-photon elastic-inelastic and inelastic-elastic mechanisms. The subleading contributions are compared with the well known $q \bar q$ and $g g$ as well as with double-parton scattering contributions. 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 constitute only about 1-2 \% of the inclusive $W^+ W^-$ cross section but about 10 \% at large $W^{\pm}$ transverse momenta. We calculate also cross section for single-diffractive production of $W^+ W^-$ pairs including pomeron and subleading reggeon exchanges in the Ingelman-Schlein model. The H1 diffractive parton distributions are used in the calculations. The results are compared to the results of elastic-inelastic (inelastic-elastic) $\gamma \gamma$ processes. M. Luszczak, A. Szczurek, arXiv:hep-ph/1309.7201

Primary authors

Antoni Szczurek (Institute of Nuclear Physics) Marta Luszczak (University of Rzeszow)

Presentation materials