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27 papers · 2 filters
Forward-backward and isospin asymmetry for B -> K* l+ l- decay in the standard model and in supersymmetry
Thorsten Feldmann, Joaquim Matias
We discuss two dedicated observables in exclusive B -> K* l+ l- decay that can be used to study effects of physics beyond the standard model, namely the forward-backward asymmetry…
Interference of Conversion and Bremsstrahlung Amplitudes in the Decay K_L -> mu^+ mu^- gamma
P. Poulose, L. M. Sehgal
In the region of large mu^+ mu^- invariant mass, the decay spectrum of K_L -> mu^+ mu^- gamma deviates from the Dalitz pair spectrum, as a result of interference between conversion…
Proton mass effects in wide-angle Compton scattering
M. Diehl, Th. Feldmann, H. W. Huang +1
We investigate proton mass effects in the handbag approach to wide-angle Compton scattering. We find that theoretical uncertainties due to the proton mass are significant for photo…
One-loop contributions of charginos and neutralinos to W-pair production in E+ E- collisions
Kaoru Hagiwara, Shinya Kanemura, Michael Klasen +1
We study the one-loop effects of charginos and neutralinos on the helicity amplitudes for $\eeww$ in the minimal supersymmetric standard model. The calculation is tested by using t…
Multipole-expanded soft-collinear effective theory with non-abelian gauge symmetry
M. Beneke, Th. Feldmann
In position space the interaction terms of soft-collinear effective theory must be multipole-expanded to obtain interaction terms with homogeneous scaling behaviour. In this note w…
Strong Final State Interactions in gamma.gamma --> W+W-
P. Poulose, L. M. Sehgal
We study the effects of a possible strong final state interaction among longitudinal W's in gamma.gamma --> W+W-. The relevant partial wave amplitudes are modified by an Omnès func…