266 research outputs found
Weak radiative corrections to the Drell-Yan process for large invariant mass of a dilepton pair
The weak radiative corrections to the Drell-Yan process above the Z-peak have
been studied. The compact asymptotic expression for the two heavy boson
exchange - one of the significant contributions to the investigated process -
has been obtained, the results expand in the powers of the Sudakov electroweak
logarithms. At the quark level we compare the weak radiative corrections to the
total cross section and forward-backward asymmetry with the existing results
and achieve a rather good coincidence at \sqrt{s}>= 0.5 TeV. The numerical
analysis has been performed in the high energy region corresponding to the
future experiments at the CERN Large Hadron Collider (LHC). To simulate the
detector acceptance we used the standard CMS detector cuts. It was shown that
double Sudakov logarithms of the WW boxes are the dominant contributions in
hadronic cross section. The considered radiative corrections are significant at
high dilepton mass M and change the dilepton mass distribution up to ~+3(-12)%
at the LHC energies and M=1(5) TeV.Comment: Changed content; 13 pp, 4 fig, 1 tabl
High precision calculations of electroweak radiative corrections for polarized Moller scattering at one loop and beyond
Parity-violating Moller scattering measurements are a powerful probe of new
physics effects, and the upcoming high-precision experiments will require a new
level of accuracy for electroweak radiative corrections (EWC). First, we
perform the updated calculations of one-loop EWC for Moller scattering
asymmetry using two different approaches: semi-automatic, precise, with
FeynArts and FormCalc as base languages, and "by hand", with reasonable
approximations. In addition, we provide a tuned comparison between the one-loop
results obtained in two different renormalization schemes: on-shell and
constrained differential renormalization. As the last step, we discuss the
two-loop EWC induced by squaring one-loop diagrams, and show that the
significant size of this partial correction indicates a need for a complete
study of the two-loop EWC in order to meet the precision goals of future
experiments.Comment: PAVI11 Workshop Proceedings (September 5-9, 2011, Rome
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