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Subleading processes in production of $W^+ W^-$ pairs in proton-proton collisions | | Marta Luszczak
; Antoni Szczurek
; | | Date: |
27 Sep 2013 | | Abstract: | We discuss many new subleading processes for inclusive production of $W^+
W^-$ pairs not included in the literature so far. 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 $q
ar q$ 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, and are even comparable to the dominant $q ar q$ component at large
$M_{WW}$, i.e. are much larger than the often celebrated $g g o W^+ W^-$
component. Its size is comparable to double parton scattering contribution.
Only elastic-elastic, elastic-inelastic and inelastic-elastic contributions
could be potentially measured to verify our predictions using forward proton
detectors. | | Source: | arXiv, 1309.7201 | | Other source: | [GID 1656929] 1510.4570 | | Services: | Forum | Review | PDF | Favorites | |
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