Summing next-to-next-to-leading logarithms in b ---> c transitions at zero recoil
Sep, 2005Citations per year
0 Citations
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.- 12.38.Bx
- 12.39.Hg
- bottom
- quark: semileptonic decay
- charm
- quantum chromodynamics: perturbation theory
- leading logarithm approximation: higher-order
- HQET model
- recoil: 0
- numerical calculations
References(14)
Figures(0)