Calculation of BR(${\bar{B}}^0\to {\Lambda }_c^{+}+\bar{p})$ in the PQCD Approach

Abstract

We calculate the branching ratio of ${\bar{B}}^0\to {\Lambda }_c^{+}\bar{p}$ in the PQCD approach. Most previous model calculations obtained branching ratios significantly larger than experimental data. We find that the predicted branching ratio for BR$({\bar{B}}^0\to {\Lambda }_c^{+}\bar{p})$ in the PQCD approach can vary over a range of $(2.3\sim 5.1)\times 10^{-5}$ with the largest uncertainty coming from the parameters in the wave function of ${\Lambda }_c$. With the favored values for the parameters in the ${\Lambda }_c^{+}$ wave function, $\beta =1$ GeV and $m_q=0.3$ GeV, the branching ratio is about $2.3\times 10^{-5}$ which is satisfactorily consistent with the value measured by experiments.

Comments: 45 pages, 4 figure and 4 tables. New version replaced