Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-09-15
Phys.Rev.Lett.74:4388-4391,1995
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, CCUTH-94-05, IP-ASTP-13-94
Scientific paper
10.1103/PhysRevLett.74.4388
We develop the perturbative QCD formalism including Sudakov effects for semi-leptonic $B$ meson decays. We evaluate the differential decay rate of $B\to \pi l \nu$, and find that the perturbative calculation is reliable for the energy fraction of the pion above 0.3. Combining predictions from the soft pion theorems, we extract the value of the matrix element $|V_{ub}|$ which is roughly $2.7\times 10^{-3}$.
Li Hsiang-nan
Yu Hoi--Lai
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