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7 papers · 2 filters
Semi-Leptonic b-decay at Intermediate Recoil
Matthew Dowling, Alexey Pak, Andrzej Czarnecki
We compute the O(α_s^2) corrections to the differential rate of the semileptonic decay b -> clv at the "intermediate recoil" point, where the c-quark mass and the invariant mass of…
Semileptonic decays in the limit of a heavy daughter quark
Matthew Dowling, Jan H. Piclum, Andrzej Czarnecki
The rate of the semileptonic decay b to c l v is calculated with order alphas^2 accuracy, as an expansion around the limit of equal masses of the b and c quarks. Recent results obt…
Heavy-to-heavy quark decays at NNLO
Alexey Pak, Andrzej Czarnecki
Details of a recent calculation of O(alpha_s^2) corrections to the decay b -> c,l,nu_l, taking into account the c-quark mass, are described. Construction of the expansion in the ma…
Study of highly-excited string states at the Large Hadron Collider
Douglas M. Gingrich, Kevin Martell
In TeV-scale gravity scenarios with large extra dimensions, black holes may be produced at future colliders. Good arguments have been made for why general relativistic black holes…
Charge asymmetries in γγ\to \ell^+\ell^-+ ν's (\ell=μ, e) with polarized photons in the Standard Model
D. A. Anipko, M. Cannoni, I. F. Ginzburg +3
It is shown that in reaction γγ\to\ell^+\ell^-+ν's at \sqrt{s}>200 GeV with polarized photons, large and well observable differences arise in the distribution of positive and negat…
Calculation of the Two-Loop Heavy-Flavor Contribution to Bhabha Scattering
R. Bonciani, A. Ferroglia, A. A. Penin
We describe in detail the calculation of the two-loop corrections to the QED Bhabha scattering cross section due to the vacuum polarization by heavy fermions. Our approach eliminat…