Hyperfine splitting of B mesons and B sub s production at the. Upsilon. (5 S )

Journal Article · Mon Dec 10 04:00:00 EST 1990 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.65.2947· OSTI ID:6144087

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

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1. The State University of New York at Stony Brook, Stony Brook, NY (USA)
2. Columbia University, New York, NY (USA)

Using the Columbia University--Stony Brook (CUSB-II) detector we have studied the inclusive photon spectrum from 2.9{times}10{sup 4} {Upsilon}(5{ital S}) decays. We observe a strong signal due to {ital B}{sup *}{r arrow}{ital B}{gamma} decays. From this we obtain (i) the average {ital B}{sup *}-{ital B} mass difference, 46.7{plus minus}0.4 MeV, (ii) the photon yield per {Upsilon}(5{ital S}) decay, {l angle}{gamma}/{Upsilon}(5{ital S}){r angle}=1.09{plus minus}0.06, and (iii) the average velocity of the {ital B}{sup *}'s, {l angle}{beta}{r angle}=0.156{plus minus}0.010, for a mix of nonstrange ({ital B}) and strange ({ital B}{sub {ital s}}) {ital B}{sup *} mesons from {Upsilon}(5{ital S}) decays. From the shape of the photon line, we find that both {ital B} and {ital B}{sub {ital s}} mesons are produced with nearly equal values for the hyperfine splitting of the {ital B} and {ital B}{sub {ital s}} meson systems.

• OSTI ID: 6144087
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 65:24; 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
645103 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
B -5325 MESONS
B MESONS
BASIC INTERACTIONS
BEAUTY MESONS
BEAUTY PARTICLES
BOSONS
BOTTOMONIUM
DATA
DECAY
ELECTROMAGNETIC INTERACTIONS
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
HADRONIC PARTICLE DECAY
HADRONS
INFORMATION
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
MASS
MASSLESS PARTICLES
MESONS
NUMERICAL DATA
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTONS
PSEUDOSCALAR MESONS
QUARKONIUM
UPSILON-10860 MESONS
VECTOR MESONS