26 research outputs found
Radiative corrections to W gamma gamma production at the LHC
No full textRadiative W production at hadron colliders is an important testing ground for the Standard Model. We consider W gamma gamma production which is sensitive to the quartic WW gamma gamma coupling. Furthermore the Standard Model amplitude for this process contains a radiation zero. We present a calculation of the NLO QCD corrections for W gamma gamma production at the LHC
MSSM corrections to the top–antitop quark forward–backward asymmetry at the Tevatron
No full textWe study the effects of the complete supersymmetric QCD and electroweak one-loop corrections to the forward–backward asymmetry at the Fermilab Tevatron collider. We work in the complex Minimal Supersymmetric Standard Model (MSSM), only restricted by the condition of minimal flavor violation (MFV). We perform a comprehensive scan over the relevant parameter space of the complex MFV–MSSM and determine the maximal possible contributions of these MSSM loop corrections to the forward–backward asymmetry in the center-of-mass frame. We find that the SUSY loop-induced asymmetry at the Tevatron with M_{t\bar{t}}>450~\mbox{GeV} can be at most +2 % for very light SUSY particles, i.e. for m_{\tilde{t}_{1}} <100~\mbox{GeV} and m_{\min} = \mathrm{Min}\{ m_{\tilde{g}},m_{\tilde{u}_{1,2}},m_{\tilde{d}_{1,2}}\}<100~\mbox{GeV}, which reduces to 0.1 % for gluino and squark masses in the range 850 GeV–1000 GeV and a light top squark of m_{\tilde{t}_{1}}=200~\mbox{GeV}
Radiative corrections for the LHC and linear collider era
No full textWe emphasize the importance of including radiative corrections when extracting physics from colliders such as the Tevatron Run II at Fermilab, the Large Hadron Collider (LHC) at CERN, and a future linear collider (LC). We review both well-tested methods and recent advances for calculating these corrections within the Standard Model of electroweak and strong interactions. We discuss the demands on theory and the prospects for matching or exceeding the anticipated experimental precision
Supersymmetric QCD one-loop effects in (un)polarized top-pair production at hadron colliders
No full textWe study the effects of O(alpha_s) supersymmetric QCD (SQCD) corrections on the total production rate and kinematic distributions of polarized and unpolarized top-pair production in pp and p anti-p collisions. At the Fermilab Tevatron p anti-p collider, top-quark pairs are mainly produced via quark-antiquark annihilation, q anti-q -> t anti-t, while at the CERN LHC pp collider gluon-gluon scattering, g g -> t anti-t, dominates. We compute the complete set of O(alpha_s) SQCD corrections to both production channels and study their dependence on the parameters of the Minimal Supersymmetric Standard Model. In particular, we discuss the prospects for observing strong, loop-induced SUSY effects in top-pair production at the Tevatron Run II and the LHC
