Soft pion emission in semileptonic [ital B]-meson decays

Journal Article · Sat Apr 01 04:00:00 EST 1995 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.51.3459· OSTI ID:6587544

Goity, J L ^[1]; Roberts, W ^[2]

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1. Department of Physics, Hampton University, Hampton, Virginia 23668 (United States) Continuous Electron Beam Accelerator Facility, 12000 Jefferson Avenue, Newport News, Virginia 23606 (United States)
2. Department of Physics, Old Dominion University, Norfolk, Virginia 23529 (United States) Continuous Electron Beam Accelerator Facility, 12000 Jefferson Avenue, Newport News, Virginia 23606 (United States)

An analysis of semileptonic decays of [ital 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 chrial and inverse heavy mass expansions. In addition to the ground-state heavy mesons, some of their resonances are included. The estimates of the various effective coupling constants and form factors needed in the analysis are obtained using a chiral quark model. An analysis of the decay spectrum in the squared invariant mass of the [pi][ital D][sup (*)] is carried out, showing the main effects of including the resonances. As the main result, a clear indication is found that the 0[sup +] and 1[sup +] resonances substantially affect the rate of the decay mode with a [ital D][sup *] in the final state, while a less dramatic effect is also noticed in the [ital D] mode. A peak related to the 0[sup [minus]] and 1[sup [minus]] radially excited [ital D] mesons is clear. The obtained rates show promising prospects for studies of soft pion emission in semileptonic [ital B]-meson decays in a [ital B]-meson factory where, modulo experimental cuts, about 10[sup 5] such decays in the [ital D] meson mode and 10[sup 4] in the [ital D][sup *] mode could be observed per year.

• DOE Contract Number: AC05-84ER40150; FG05-94ER40832
• OSTI ID: 6587544
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 51:7; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

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662350* -- Decays of Mesons-- (1992-)
662420 -- Properties of Mesons & Meson Resonances-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B MESONS
BEAUTY PARTICLES
BOSONS
CHARM PARTICLES
CHARMED MESONS
CHIRAL SYMMETRY
COMPOSITE MODELS
COUPLING CONSTANTS
D MESONS
DECAY
ELEMENTARY PARTICLES
EMISSION
ENERGY LEVELS
FORM FACTORS
FUNCTIONS
GROUND STATES
HADRONS
LAGRANGIAN FUNCTION
MASS
MATHEMATICAL MODELS
MESONS
PARTICLE DECAY
PARTICLE MODELS
PARTICLE PROPERTIES
PIONS
PSEUDOSCALAR MESONS
QUARK MODEL
RESONANCE
SEMILEPTONIC DECAY
SPECTRA
SYMMETRY
WEAK PARTICLE DECAY