575 research outputs found
EW one-loop corrections to the longitudinally polarized Drell--Yan scattering. (I). The Neutral current case
Complete one-loop electroweak corrections to neutral current Drell-Yan
process are presented for the case of longitudinal
polarization of initial particles. Cross sections for longitudinally polarized
protons allow us to estimate different combinations of polarized quark
distributions from single- and double-spin asymmetries. Numerical impact of
electroweak next-order corrections to asymmetries as function of the vector
boson rapidity and lepton pseudorapidities in the hadron-hadron centre-of-mass
frame using the MC generator ReneSANCe is thoroughly studied.Comment: 7 pages, 9 figure
J_AW,WA functions in Passarino-Veltman reduction
In this paper we continue to study a special class of Passarino-Veltman
functions J arising at the reduction of infrared divergent box diagrams. We
describe a procedure of separation of two types of singularities, infrared and
mass singularities, which are absorbed in simple C0 functions. The infrared
divergences of C0's can be regularized then by any method: photon mass,
dimensionally or by the width of an unstable particle. Functions J, in turn,
are represented as certain linear combinations of the standard D0 and C0
Passarino-Veltman functions. The former are free of both types of singularities
and are expressed as explicit and compact linear combinations of logarithms and
dilogarithm functions. We present extensive comparisons of numerical results
with those obtained with the aid of the LoopTools package
Computer package DIZET v. 6.45
The new version of the DIZET electroweak library is described. Changes and
additional code features concerning the previous version are explained. The
software allows one to make state-of-the-art theoretical predictions for
pseudo-observable quantities, including higher-order radiative corrections. The
current version of the DIZET library v. 6.45 incorporates advanced recent
results of theoretical calculations. Numerical comparisons with the results of
the previous version are performed. Estimates of theoretical uncertainties are
discussed.Comment: 14 pages, 3 figures, 8 table
- …