Summing next-to-next-to-leading logarithms in b->c transitions at zero recoil

Details Summing next-to-next-to-leading logarithms in b->c transitions at zero recoil Summing next-to-next-to-leading logarithms in b->c transitions at zero recoil

2005-09-28

arxiv.org/abs/hep-ph/0509328v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX2e (elsart class), 10 pages, no figures. The complete paper is also available via the www at http://www-ttp.physik.uni-

Scientific paper

Perturbative corrections to b->c transitions at zero recoil are considered in the two-step matching scheme. The matching coefficient for the b->c currents from the intermediate effective theory (between the scales m_b and m_c) to the low-energy effective theory (scales below m_c) has been found with two-loop accuracy. The next-to-next-to-leading logarithms has been summed in the leading order in m_c/m_b. Higher-order corrections are estimated in the large-beta_0 limit.

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