75 research outputs found
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
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