Speaker
Marta Luszczak
(University of Rzeszow)
Description
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)
