793 research outputs found
QCD corrections to single slepton production at hadron colliders
We evaluate the cross section for single slepton production at hadron
colliders in supersymmetric theories with R-parity violating interactions to
the next-to-leading order in QCD. We obtain fully differential cross section by
using the phase space slicing method. We also perform soft-gluon resummation to
all order in of leading logarithm to obtain a complete transverse
momentum spectrum of the slepton. We find that the full transverse momentum
spectrum is peaked at a few GeV, consistent with the early results for
Drell-Yan production of lepton pairs. We also consider the contribution from
gluon fusion via quark-triangle loop diagrams dominated by the -quark loop.
The cross section of this process is significantly smaller than that of the
tree-level process induced by the initial annihilation.Comment: one new reference is adde
Chiral Couplings of W' and Top Quark Polarization at the LHC
If a TeV-scale charged gauge boson (W') is discovered at the Large Hadron
Collider (LHC), it will become imperative to determine its chiral couplings to
standard model (SM) fermions in order to learn about the underlying theory
containing the W'. We describe the reconstruction of the t, b decay mode of the
W' at the LHC, and identify various kinematic observables such as the angular
distributions of the top quark and the lepton resulting from top decay that can
be used to disentangle the chiral couplings of the W' to SM fermions. We
demonstrate by presenting analytical expressions, numerical simulations, as
well as intuitive illustrations for these observables at the LHC that among the
SM fermions, the polarized top quark can most directly probe the chirality of
such couplings.Comment: 35 pages, 12 Figure
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