3 years ago

# Improved perturbative QCD formalism for $B_c$ meson decays.

Hsiang-nan Li, Xin Liu, Zhen-Jun Xiao

We derive the $k_T$ resummation for doubly heavy-flavored $B_c$ meson decays by including the charm quark mass effect into the known formula for a heavy-light system. The resultant Sudakov factor is employed in the perutrbative QCD (PQCD) study of the "golden channel" $B_c^+ \to J/\psi \pi^+$. With a reasonable model for the $B_c$ meson distribution amplitude, which maintains approximate on-shell conditions of both the partonic bottom and charm quarks, it is observed that the imaginary piece of the $B_c \to J/\psi$ transition form factor appears to be power suppressed, and the $B_c^+ \to J/\psi \pi^+$ branching ratio is not lower than $10^{-3}$. The above improved PQCD formalism is applicable to $B_c$ meson decays to other charmonia and charmed mesons.

Publisher URL: http://arxiv.org/abs/1801.06145

DOI: arXiv:1801.06145v1

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