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Heavy-to-heavy quark decays at NNLO · Around

2008

Heavy-to-heavy quark decays at NNLO

Pak, Alexey, Czarnecki, Andrzej

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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 mass ratio m_c/m_b as well as the evaluation of new four-loop master integrals are presented.
The same techniques are applicable to the muon decay, mu -> e,nu_mu,anti-nu_e.
Analytical results are presented, for the physical cases as well as for a model with purely-vector couplings.

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