Measurement of baryon production in B -meson decay

Journal Article · Sat Feb 01 00:00:00 EST 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.45.752· OSTI ID:7048465

Crawford, G; Fulton, R; Jensen, T; Johnson, D R; Kagan, H; Kass, R; Malchow, R; Morrow, F; Whitmore, J; Wilson, P; Bortoletto, D; Brown, D; Dominick, J; McIlwain, R L; Miller, D H; Modesitt, M; Ng, C R; Schaffner, S F; Shibata, E I; Shipsey, I P.J. ; Battle, M; Kroha, H; Sparks, K; Thorndike, E H; Wang, C; Alam, M S; Kim, I J; Li, W C; Lou, X C; Nemati, B; Romero, V; Sun, C R; Wang, P; Zoeller, M M; Goldberg, M; Haupt, T; Horwitz, N; Jain, V; Kennett, R; Mestayer, M D; Moneti, G C; Rozen, Y; Rubin, P; Skwarnicki, T; Stone, S; Thusalidas, M; Yao, W; Zhu, G; Barnes, A V; Bartelt, J; Csorna, S E; Letson, T; Alexander, J; Artuso, M; Bebek, C; Berkelman, K; Besson, D; Browder, T; Cassel, D G; Cheu, E; Coffman, D M; Drell, P S; Ehrlich, R; Galik, R S; Garcia-Sciveres, M; Geiser, B; Gittelman, B; Gray, S W; Hartill, D L; Heltsley, B K; Honscheid, K; Kandaswamy, J; Katayama, N; Kreinick, D L; Lewis, J D; Ludwig, G S; Mas,

Using the CLEO detector at the Cornell Electron Storage Ring, we observe {ital B}-meson decays to {Lambda}{sub {ital c}}{sup +} and report on improved measurements of inclusive branching fractions and momentum spectra of other baryons. For the inclusive decay {ital {bar B}}{r arrow}{Lambda}{sub {ital c}}{sup +}{ital X} with {Lambda}{sub {ital c}}{sup +}{r arrow}{ital pK}{sup {minus}}{pi}{sup +}, we find that the product branching fraction {ital B}({ital {bar B}}{r arrow}{Lambda}{sub {ital c}}{sup +}{ital X}){ital B}({Lambda}{sub {ital c}}{sup +}{r arrow}{ital pK}{sup {minus}}{pi}{sup +})=(0.273{plus minus}0.051{plus minus} 0.039)%. Our measured inclusive branching fractions to noncharmed baryons are {ital B}({ital B}{r arrow}{ital pX})=(8.0{plus minus}0.5{plus minus}0.3)%, {ital B}({ital B}{r arrow}{Lambda}{ital X})=(3.8{plus minus}0.4{plus minus}0.6)%, and {ital B}({ital B}{r arrow}{Xi}{sup {minus}}{ital X})=(0.27{plus minus}0.05{plus minus}0.04)%. From these rates and studies of baryon-lepton and baryon-antibaryon correlations in {ital B} decays, we have estimated the branching fraction {ital B}({ital {bar B}}{r arrow}{Lambda}{sub {ital c}}{sup +}{ital X}) to be (6.4{plus minus}0.8{plus minus}0.8)%. Combining these results, we calculate {ital B}({Lambda}{sub {ital c}}{sup +}{r arrow}{ital pK}{sup {minus}}{pi}{sup +}) to be (4.3{plus minus}1.0{plus minus}0.8)%.

• DOE Contract Number: AC02-78ER05001; FG05-86ER40272
• OSTI ID: 7048465
• Journal Information: Physical Review, D (Particles Fields); (United States), Vol. 45:3; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B MESONS
HADRONIC PARTICLE DECAY
LAMBDA C PLUS BARYONS
PARTICLE PRODUCTION
BARYONS
BRANCHING RATIO
CESR STORAGE RING
CHARM PARTICLES
INCLUSIVE INTERACTIONS
MONTE CARLO METHOD
PARTICLE IDENTIFICATION
PROTONS
RADIATION DETECTORS
TIME-OF-FLIGHT METHOD
XI MINUS PARTICLES
BEAUTY PARTICLES
BOSONS
CHARMED BARYONS
DECAY
ELEMENTARY PARTICLES
FERMIONS
HADRONS
HYPERONS
INTERACTIONS
MEASURING INSTRUMENTS
MESONS
NUCLEONS
PARTICLE DECAY
PARTICLE INTERACTIONS
PSEUDOSCALAR MESONS
STORAGE RINGS
STRANGE PARTICLES
XI BARYONS
XI PARTICLES
662350* - Decays of Mesons- (1992-)