NLO Electroweak Corrections to Higgs Decay to Two Photons

The recent calculation of the next-to-leading order electroweak corrections to the decay of the Standard Model Higgs boson to two photons in the framework of the complex-mass scheme is briefly summarized.Comment: 4 pages, 4 figures, talk given at LCWS08, Chicago, November 200

Planar two-loop master integrals for massive Bhabha scattering: N_f=1 and N_f=2

Recent developments in the computation of two-loop master integrals for massive Bhabha scattering are briefly reviewed. We apply a method based on expansions of exact Mellin-Barnes representations and evaluate all planar four-point master integrals in the approximation of small electron mass at fixed scattering angle for the one-flavor case. The same technique is employed to derive and evaluate also all two-loop masters generated by additional fermion flavors. The approximation is sufficient for the determination of QED two-loop corrections for Bhabha scattering in the kinematics planned to be used for the luminosity determination at the ILC.Comment: 10 pages, 3 figures, 1 table, to appear in the proceedings of 8th DESY Workshop on Elementary Particle Theory: Loops and Legs in Quantum Field Theory, Eisenach, Germany, 23-28 Apr 2006; eqns. 22 and 23 correcte

NLO Electroweak Corrections to Higgs Boson Production at Hadron Colliders

Results for the complete NLO electroweak corrections to Standard Model Higgs production via gluon fusion are included in the total cross section for hadronic collisions. Artificially large threshold effects are avoided working in the complex-mass scheme. The numerical impact at LHC (Tevatron) energies is explored for Higgs mass values up to 500 GeV (200 GeV). Assuming a complete factorization of the electroweak corrections, one finds a +5 % shift with respect to the NNLO QCD cross section for a Higgs mass of 120 GeV both at the LHC and the Tevatron. Adopting two different factorization schemes for the electroweak effects, an estimate of the corresponding total theoretical uncertainty is computed.Comment: LaTeX, 11 pages, 3 figure

Two Loop QFT in the Making

Recent developments in the evaluation of two-loop pseudo-observables and observables are briefly reviewed.Comment: 5 pages, 2 figures, to appear in the proceedings of the 8th DESY Workshop on Elementary Particle Theory "Loops and Legs in Quantum Field Theory", April 2006, Eisenach, German

NLO QED Corrections to Hard-Bremsstrahlung Emission in Bhabha Scattering

In this paper we present a numerical implementation of the one-loop QED corrections to the hard-bremsstrahlung process e- e+ \to e- e+ gamma. These corrections can be included in the Monte Carlo event generators employed for simulating Bhabha scattering events at low-energy high-luminosity electron-positron colliders. The calculation is performed by employing the reduction method developed by Ossola, Papadopoulos and Pittau. Our results are implemented in a modular code for the numerical evaluation of the scattering amplitudes for any given phase-space point. In a similar way, we also evaluate the one-loop QED corrections to e- e+ \to mu- mu+ gamma, which represents an interesting application of the method in the presence of two different mass scales in the loops.Comment: 8 pages, 5 figures, v2 minor changes: comments and references added, matches PLB versio