B r arrow. pi. nu. nu. ,. rho. nu. nu. and determination of t bar V sub t d / V sub u b t bar

Journal Article · Mon Jul 01 04:00:00 EDT 1991 · Physical Review, D (Particles Fields); (USA)

DOI:https://doi.org/10.1103/PhysRevD.44.291· OSTI ID:5538382

Schwartz, A ^[1]; Deshpande, N G ^[2]; Urheim, J ^[3]

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1. Department of Physics, Stanford University, Stanford, California 94305-4060 (USA)
2. Institute of Theoretical Science, University of Oregon, Eugene, Oregon 97403 (USA)
3. Department of Physics, California Institute of Technology, Pasadena, California 91125 (USA)

The rare decays {ital B}{r arrow}{pi}{nu}{bar {nu}} and {ital B}{r arrow}{rho}{nu}{bar {nu}} are investigated. The ratio of branching fractions {ital B}({ital B}{r arrow}{ital M}{nu}{bar {nu}})/{ital B}({ital B}{r arrow}{ital Ml}{bar {nu}}) is shown to depend on the ratio {vert bar}{ital V}{sub {ital t}{ital d}}/{ital V}{sub {ital u}{ital b}}{vert bar} of Kobayashi-Maskawa matrix elements with little hadronic uncertainty. The measurement of these fractions thus gives a robust constraint on the Kobayashi-Maskawa matrix. The branching fractions for {ital B}{r arrow}{pi}{nu}{bar {nu}}, {rho}{nu}{bar {nu}} are estimated to range from 10{sup {minus}8} to 10{sup {minus}6}; an experimental method is presented which yields a single-event sensitivity below 10{sup {minus}4}.

• OSTI ID: 5538382
• Journal Information: Physical Review, D (Particles Fields); (USA), Journal Name: Physical Review, D (Particles Fields); (USA) Vol. 44:1; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

645203* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANTILEPTONS
ANTIMATTER
ANTINEUTRINOS
ANTIPARTICLES
B MESONS
BEAUTY PARTICLES
BOSONS
BRANCHING RATIO
DECAY
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
FORM FACTORS
FUNCTIONS
HADRONS
ISOSPIN
KOBAYASHI-MASKAWA MATRIX
LAGRANGIAN FUNCTION
LEPTONS
MASSLESS PARTICLES
MATHEMATICAL MODELS
MATRICES
MATRIX ELEMENTS
MATTER
MESONS
MONTE CARLO METHOD
NEUTRINOS
PARTICLE DECAY
PARTICLE MODELS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PIONS
PSEUDOSCALAR MESONS
SEMILEPTONIC DECAY
STANDARD MODEL
UNIFIED GAUGE MODELS
UNIFIED-FIELD THEORIES
WEAK PARTICLE DECAY