Measurement of baryon production in B -meson decay

Journal Article · Fri Jan 31 23:00:00 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), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 45:3; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

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