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Positronium hyperfine splitting: analytical value at m*alpha^6
A. Czarnecki, K. Melnikov, A. Yelkhovsky
We present an analytic calculation of the m*alpha^6 recoil corrections to the hyperfine splitting (HFS) of the ground state energy levels in positronium. We find ΔE_{\rm rec} = m a…
Perturbative QCD calculations with heavy quarks
Andrzej Czarnecki, Kirill Melnikov
We review recent calculations of second order corrections to heavy quark decays. Techniques developed in this context are applicable to many processes involving heavy charged parti…
Two-loop QCD corrections to top quark width
Andrzej Czarnecki, Kirill Melnikov
We present O(alpha_s^2) corrections to the decay t-->bW in the limit of a very large top quark mass, m_t >> m_W. We find that the O(alpha_s^2) effects decrease the top quark decay…
The b quark low-scale running mass from Upsilon sum rules
Kirill Melnikov, Alexander Yelkhovsky
The b quark low-scale running mass m_kin is determined from an analysis of the Upsilon sum rules in the next-to-next-to-leading order (NNLO). It is demonstrated that using this mas…
Two-loop QCD corrections to semileptonic b decays at an intermediate recoil
Andrzej Czarnecki, Kirill Melnikov
We present complete O(alpha_s^2) corrections to the decay b-->c+l+nu at the point where the invariant mass of the leptons sqrt{q^2} equals the c quark mass. We use this result, tog…
Top quark production at threshold with O(alpha_s^2) accuracy
Kirill Melnikov, Alexander Yelkhovsky
We calculate the next-to-next-to-leading order correction to the cross section for top quark pair production in e+e- annihilation in the threshold region, resumming all O [ (alpha_…
Coherent muon-electron conversion in muonic atoms
Andrzej Czarnecki, William J. Marciano, Kirill Melnikov
Transition rates for coherent muon-electron conversion in muonic atoms, mu+N --> e+N, are computed for various types of muon number violating interactions. Attention is paid to rel…