Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-01-12
Phys.Rev.D53:4991-5000,1996
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, revtex, 2 figures as uudecoded file
Scientific paper
10.1103/PhysRevD.53.4991
We investigate the total inclusive decay rate of the (ground state) $B_c$ meson within the framework of an operator product expansion in inverse powers of the heavy quark masses and subsequent matching onto nonrelativistic QCD. The expansion is organized as a series in the strong coupling and in powers of the heavy quark velocities in the $B_c$, reflecting the nonrelativistic nature of a heavy-heavy bound state. In this aspect the character of the expansion differs from the more familiar case of heavy-light mesons. The framework incorporates systematically corrections to the leading $b$- and $c$-quark decays due to binding effects, as well as contributions from weak annihilation and Pauli interference. Based on this approach we find for the $B_c$ meson lifetime $\tau_{B_c}=(0.4 - 0.7)\,$ps, the dominant mechanism being the decay of the charm constituent.
Beneke Martin
Buchalla Gerhard
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