Zobrazeno 1 - 10
of 146
pro vyhledávání: '"van Neerven, W. L."'
We describe the calculation of the two--loop massive operator matrix elements with massive external fermions in QED. We investigate the factorization of the $O(\alpha^2)$ initial state corrections to $e^+e^-$ annihilation into a virtual boson for lar
Externí odkaz:
http://arxiv.org/abs/1111.6480
Publikováno v:
Phys.Rev.D77:034014,2008
We present the gluon-gluon and photon-gluon helicity amplitudes for color singlet and octet charmonium production in polarized and unpolarized hadron-hadron and photon-hadron collisions.
Comment: 11 pages amstex no figures
Comment: 11 pages amstex no figures
Externí odkaz:
http://arxiv.org/abs/0710.3090
Publikováno v:
Nucl.Phys.B767:100-129,2007
We present threshold enhanced QCD corrections to rapidity distributions of di-leptons in the Drell-Yan process and of Higgs particles in both gluon fusion and bottom quark annihilation processes using Sudakov resummed cross sections. We have used ren
Externí odkaz:
http://arxiv.org/abs/hep-ph/0608308
Publikováno v:
Nucl.Phys.B755:272-285,2006
The logarithmic and constant contributions to the Wilson coefficient of the longitudinal heavy quark structure function to $O(\alpha_s^3)$ are calculated using mass factorization techniques in Mellin space. The small $x$ behaviour of the Wilson coeff
Externí odkaz:
http://arxiv.org/abs/hep-ph/0608024
Autor:
Smith, J., van Neerven, W. L.
Publikováno v:
Nucl.Phys. B720 (2005) 182-202
In the framework of the gluon-gluon fusion process for Higgs boson production there are two different prescriptions. They are given by the exact process where the gluons couple via top-quark loops to the Higgs boson and by the approximation where the
Externí odkaz:
http://arxiv.org/abs/hep-ph/0501098
Autor:
Smith, J., van Neerven, W. L.
Publikováno v:
Eur.Phys.J. C40 (2005) 199-203
We discuss the difference between n-dimensional regularization and n-dimensional reduction for processes in QCD which have an additional mass scale. Examples are heavy flavour production in hadron-hadron collisions or on-shell photon-hadron collision
Externí odkaz:
http://arxiv.org/abs/hep-ph/0411357
Publikováno v:
Nucl.Phys. B713 (2005) 333-377
The first results on next-to-leading order QCD corrections to graviton-induced processes in hadron collisions in models of TeV-scale gravity are presented focusing on the case of dilepton pair production in \bar p p and pp collisions. Distributions i
Externí odkaz:
http://arxiv.org/abs/hep-ph/0411018
Publikováno v:
Nucl.Phys. B704 (2005) 332-348
In this paper we present the complete two-loop vertex corrections to scalar and pseudo-scalar Higgs boson production for general colour factors for the gauge group ${\rm SU(N)}$ in the limit where the top quark mass gets infinite. We derive a general
Externí odkaz:
http://arxiv.org/abs/hep-ph/0408315
We discuss the next-to-next-to-leading order (NNLO) corrections to the total cross section for (pseudo-) scalar Higgs boson production. The computation is carried out in the effective Lagrangian approach which emerges from the standard model by takin
Externí odkaz:
http://arxiv.org/abs/hep-ph/0405263
We present the full next-to-next-to-leading order (NNLO) corrections to the coefficient function for the polarized cross section $d \Delta\sigma/d Q$ of the Drell-Yan process. We study the effect of these corrections on the process $p+p\to l^+l^-+`X'
Externí odkaz:
http://arxiv.org/abs/hep-ph/0405233