Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-09-12
Phys.Rev.D67:094001,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
26 pages, 5 figures (6 eps-files), submitted to Phys. Rev. D
Scientific paper
10.1103/PhysRevD.67.094001
The annihilation of the $B_c$ meson to leptons and inclusive light hadrons is analyzed in the framework of nonrelativistic QCD (NRQCD) factorization. We find that the decay mode, which escapes from the helicity suppression, contributes a sizable fraction width. According to the analysis, the branching ratio due to the contribution from the color-singlet component of the meson $B_c$ can be of order (10^{-2}). We also estimate the contributions from the color-octet components. With the velocity scaling rule of NRQCD, we find that the color-octet contributions are sizable too, especially, in certain phase space of the annihilation they are greater than (or comparative to) the color-singlet component. A few observables relevant to the spectrum of charged lepton are suggested, that may be used as measurements on the color-octet and color-singlet components in the future $B_c$ experiments. A typical long distance contribution in the annihilation is estimated too.
Chang Chao-Hsi
Chen Yu-Qi
Fang Zheng-Yun
Wu Xing-Gang
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