B semileptonic decays at the. Upsilon. (4 S ) and the. Upsilon. (5 S )

Journal Article · Mon May 13 04:00:00 EDT 1991 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.66.2436· OSTI ID:5593830

Yanagisawa, C; Heintz, U; Lee-Franzini, J; Lovelock, D M.J.; Narain, M; Schamberger, R D; Willins, J ^[1]; Franzini, P; Tuts, P M ^[2]

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1. Department of Physics, State University of New York at Stony Brook, Stony Brook, New York 11794 (USA)
2. Columbia University, New York, New York, 10027 (USA)

{ital B}-meson semileptonic decay spectra have been obtained at the {Upsilon}(4{ital S}) and at the {Upsilon}(5{ital S}) at the Cornell Electron Storage Ring with the Columbia University--Stony Brook detector. The branching ratio for {ital B}{r arrow}{ital e}{nu}{ital X} at the {Upsilon}(4{ital S}) is found to be (10.0{plus minus}0.5)%. The electron spectrum of {ital B}{r arrow}{ital e}{nu}{ital X} at the {Upsilon}(5{ital S}) is observed for the first time and the average branching ratio of {ital B},{ital B}{sub {ital s}}{r arrow}{ital e}{nu}{ital X} is consistent with that for {ital B}'s from {Upsilon}(4{ital S}) decays. The shape of the electron spectrum at the {Upsilon}(5{ital S}) indicates production of {ital B} mesons which are heavier than nonstrange {ital B}'s, presumably strange {ital B}'s.

• OSTI ID: 5593830
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 66:19; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
645102 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
B -5325 MESONS
B MESONS
B MINUS MESONS
BEAUTY MESONS
BEAUTY PARTICLES
BOSONS
BOTTOMONIUM
BRANCHING RATIO
CORNELL 10-GEV SYNCHROTRON
CYCLIC ACCELERATORS
DATA
DECAY
DETECTION
ELECTRON SPECTRA
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
GAMMA DETECTION
GEV RANGE
GEV RANGE 01-10
HADRONS
INFORMATION
MESONS
MONTE CARLO METHOD
NUMERICAL DATA
PARTICLE DECAY
PSEUDOSCALAR MESONS
QUARKONIUM
RADIATION DETECTION
SEMILEPTONIC DECAY
SPECTRA
SYNCHROTRONS
UPSILON-10575 MESONS
UPSILON-10860 MESONS
VECTOR MESONS
WEAK PARTICLE DECAY