Measurement of the {bar B} {yields} D{ell}{bar {nu}} Anti-Neutrino Partial Width and Form Factor Parameters

Technical Report · Mon May 05 04:00:00 EDT 2003

DOI:https://doi.org/10.2172/813077· OSTI ID:813077

Jessop, Colin P ^[1]

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1. SLAC

We have studied the decay {bar B} {yields} D{ell}{bar {nu}}, where {ell} = e or {mu}. From a fit to the differential decay rate d{Lambda}/dw we measure the rate normalization F{sub D}(1)|V{sub cb}| and form factor slope {rho}{sub D}{sup 2}, and, using measured values of {tau}{sub B}, find {Lambda}({bar B} {yields} D{ell}{bar {nu}}) = (12.0 {+-} 0.9 {+-} 2.1) ns{sup -1}. The resulting branching fractions are {Beta}({bar B}{sup 0} {yields} D{sup +}{ell}{sup -}{bar {nu}}) = (1.87 {+-} 0.15 {+-} 0.32)% and {Beta}(B{sup -} {yields} D{sup 0}{ell}{sup -}{bar {nu}}) = (1.94 {+-} 0.15 {+-} 0.34)%. The form factor parameters are in agreement with those measured in {bar B} {yields} D*{ell}{bar {nu}} decays, as predicted by heavy quark effective theory.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (US)
• Sponsoring Organization: USDOE Office of Science (US)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 813077
• Report Number(s): SLAC-PUB-9776
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DATA
DECAY
FORM FACTORS
QUARKS