Extraction of {ital V}{sub {ital ub}} from the decay {ital B}{r_arrow}{pi}{ital l}{nu}

Journal Article · Mon May 29 00:00:00 EDT 1995 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.74.4388· OSTI ID:69267

Li, H; Yu, H ^[1]

---

1. Department of Physics, National Chung-Cheng University, Chia-Yi, Taiwan (Taiwan, Province of China)

We develop the perturbative QCD formalism for semileptonic {ital B} meson decays, which includes Sudakov suppression on the spatial extent of a heavy meson containing a light valence quark. We show that the perturbative calculation for the spectrum of the decay {ital B}{r_arrow}{pi}{ital l}{nu} is reliable for the energy fraction of the pion above 0.3. Combining predictions from soft pion theorems, we obtain an upper limit of the matrix element {vert_bar}{ital V}{sub {ital ub}}{vert_bar} of roughly 3.5{times}10{sup {minus}3}.

• OSTI ID: 69267
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 22 Vol. 74; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
B MESONS
MATRIX ELEMENTS
PERTURBATION THEORY
PIONS
QUANTUM CHROMODYNAMICS
QUARKS
SEMILEPTONIC DECAY
SPECTRA