Soft pion emission in semileptonic B-meson decays

Journal Article · Tue Mar 01 04:00:00 EST 1994 · Phys.Rev. D51 (1995) 3459-3477

OSTI ID:756879

Goity, J; Roberts, W

An analysis of semileptonic decays of B mesons with the emission of a single soft pion is presented in the framework of the heavy-quark limit using an effective Lagrangian which implements chiral and heavy-quark symmetries. The analysis is performed at leading order of the chiral and inverse heavy mass expansions. In addition to the ground state heavy mesons some of their resonances are included. The estimates of the various coupling constants and form factors needed in the analysis are obtained using a chiral quark model. As the main result, a clear indication is found that the 0{sup +} and 1{sup +} resonances substantially affect the decay mode with a D{sup *} in the final state, and a less dramatic effect is also noticed in the D mode. An analysis of the decay spectrum in the D{sup *}-{pi}{sup 2} invariant mass is carried out, showing the main effects of including the resonances. The obtained rates show promising prospects for studies of soft pion emission in semileptonic B-meson decays in a B-meson factory where, module experimental cuts, about 10{sup 5} such decays in the D meson mode and 10{sup 4} in the D{sup *} mode could be observed per year.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (US)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 756879
• Report Number(s): CEBAF-TH-94-05; DOE/ER/40150-1648; hep-ph/9406236
• Journal Information: Phys.Rev. D51 (1995) 3459-3477, Journal Name: Phys.Rev. D51 (1995) 3459-3477
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B MESONS
D MESONS
EFFECTIVE RANGE THEORY
LAGRANGIAN FUNCTION
PIONS
SEMILEPTONIC DECAY