28 research outputs found
Electroweak corrections to W-boson pair production at the LHC
Vector-boson pair production ranks among the most important Standard-Model
benchmark processes at the LHC, not only in view of on-going Higgs analyses.
These processes may also help to gain a deeper understanding of the electroweak
interaction in general, and to test the validity of the Standard Model at
highest energies. In this work, the first calculation of the full one-loop
electroweak corrections to on-shell W-boson pair production at hadron colliders
is presented. We discuss the impact of the corrections on the total cross
section as well as on relevant differential distributions. We observe that
corrections due to photon-induced channels can be amazingly large at energies
accessible at the LHC, while radiation of additional massive vector bosons does
not influence the results significantly.Comment: 29 pages, 15 figures, 4 tables; some references and comments on
\gamma\gamma -> WW added; matches version published in JHE
Interference effects for H -> WW/ZZ -> 2l 2nu searches in gluon fusion at the LHC
WW/ZZ interference for Higgs signal and continuum background as well as
signal-background interference is studied for same-flavour l anti-nu_l anti-l
nu_l final states produced in gluon-gluon scattering at the LHC for light and
heavy Higgs masses with minimal and realistic experimental selection cuts. For
the signal cross section, we find WW/ZZ interference effects of O(5%) at M_H =
126 GeV. For M_H >= 200 GeV, we find that WW/ZZ interference is negligible. For
the gg continuum background, we also find that WW/ZZ interference is
negligible. As general rule, we conclude that non-negligible WW/ZZ interference
effects occur only if at least one weak boson of the pair is dominantly
off-shell due to kinematic constraints. The subdominant weak boson pair
contribution induces a correction to the signal-background interference, which
is at the few percentage point level before search selection cuts. Optimised
selection cuts for M_H >~ 600 GeV are suggested.Comment: 22 pages, 2 figures, 9 tables; added 2 references, version to appear
in JHE