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Two-loop QCD corrections to the heavy quark pair production cross section in e+e- annihilation near the threshold
Andrzej Czarnecki, Kirill Melnikov
We present the O(alpha_s) corrections to the cross section for the reaction e+e- --> gamma^* --> Q \bar Q in the energy region close to the threshold. We assume that the energy of…
|V_{cb}| from semileptonic B decays with two-loop QCD accuracy
Andrzej Czarnecki, Kirill Melnikov
Recent progress in calculating O(alpha_s^2) corrections to inclusive and exclusive semileptonic b-->c transitions is reviewed. The impact of these corrections on the |V_cb| determi…
Lepton pair production by a high energy photon in a strong electromagnetic field
Dmitri Ivanov, Kirill Melnikov
Using impact-factor representation, we consider the lepton pair production by an incident high-energy photon in a strong electromagnetic field of a nucleus. By summing leading term…
Non-Abelian Dipole Radiation and the Heavy Quark Expansion
Andrzej Czarnecki, Kirill Melnikov, Nikolaj Uraltsev
Dipole radiation in QCD is derived to the second order in . A power-like evolution of the spin-singlet heavy quark operators is obtained to the same accuracy. In particular, $…
Complete O(alpha_s^2) Corrections to Zero-Recoil Sum Rules for B-->D* Transitions
Andrzej Czarnecki, Kirill Melnikov, Nikolai Uraltsev
We present the complete O(alpha_s^2) corrections to the Wilson coefficient of the unit operator in the zero-recoil sum rule for the B-->D* transition. We include both perturbative…
Techniques for computing two-loop QCD corrections to b-->c transitions
Andrzej Czarnecki, Kirill Melnikov
We have recently presented the complete O(alpha_s^2) corrections to the semileptonic decay width of the b quark at maximal recoil. Here we discuss various technical aspects of that…
Two-loop QCD corrections to semileptonic b decays at maximal recoil
Andrzej Czarnecki, Kirill Melnikov
We present a complete correction to the differential width of the inclusive semileptonic decay at the kinematical point of vanishing invariant mass of the l…
Two-loop QCD Corrections to Transitions at Zero Recoil: Analytical Results
Andrzej Czarnecki, Kirill Melnikov
We present analytical results for the contributions to the functions and which parameterize QCD corrections to semileptonic transitions at zero re…