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

Andrey Grozin

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

High Energy Physics - Phenomenology 2007-05-23 v2

Authors: Andrey Grozin

Abstract

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.

Keywords

b→c transitions next-to-next-to-leading logarithms matching coefficient two-loop accuracy low-energy effective theory

Cite

@article{arxiv.hep-ph/0509328,
  title  = {Summing next-to-next-to-leading logarithms in b->c transitions at zero recoil},
  author = {Andrey Grozin},
  journal= {arXiv preprint arXiv:hep-ph/0509328},
  year   = {2007}
}

Comments

LaTeX2e (elsart class), 10 pages, no figures. The complete paper is also available via the www at http://www-ttp.physik.uni-karlsruhe.de/Preprints/ v2: discussion extended, references added

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

Abstract

Keywords

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