Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-05-07
Phys.Rev. D48 (1993) 5202-5207
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages
Scientific paper
10.1103/PhysRevD.48.5202
Heavy quark symmetry relations for $B\rightarrow De\bar \nu_e$ and $B\rightarrow D^*e \bar \nu_e$ form factors receive corrections suppressed by powers of the charm quark mass. For small up and down quark massed the leading corrections of order $(1/m_c)^{n+2}~n = 0,1,2,...$ have a nonanalytic dependence on the light quark masses of the form $\ell n m_\pi^2$ for $n = 0$ and $(1/m_\pi)^n$ for $n = 1,2, ...$~. These corrections arise from very low momentum physics (i.e., well below the chiral symmetry breaking scale) and are computed using chiral perturbation theory. They are typically of order a few percent.
Chow Chi-Keung
Wise Mark B.
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