Study of the decay D sup + r arrow K sup 0 e+. nu. sub e

Journal Article · Mon Sep 16 00:00:00 EDT 1991 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.67.1507· OSTI ID:5179445

Anjos, J C; Appel, J A; Bean, A; Bracker, S B; Browder, T E; Cremaldi, L M; Duboscq, J E; Elliott, J R; Escobar, C O; Gibney, M C; Hartner, G F; Karchin, P E; Kumar, B R; Losty, M J; Luste, G J; Mantsch, P M; Martin, J F; McHugh, S; Menary, S R; Morrison, R J ; Nash, T; Pinfold, J; Punkar, G; Purohit, M V; Ross, W R; Santoro, A F.S.; Schmidt, D M; Shoup, A L; Sliwa, K; Sokoloff, M D; Souza, M H.G.; Sperka, D; Spalding, W J; Streetman, M E; Stundzia, A B; Witherell, M S ^[1]

---

1. University of California, Santa Barbara, California (USA) Carleton University, Ottawa, Ontario (Canada) Centro Brasileiro de Pesquisas Fisica, Rio de Janeiro, Brazil University of Cincinnati, Cincinnati, Ohio (USA) University of Colorado, Boulder, Colorado (USA) Fermi National Accelerator Laboratory, Batavia, Illinois (USA) University of Mississippi, Oxford, Mississippi (USA) National Research Council, Ottawa, Ontario, Canada K1A 0R6 Princeton University, Princeton, New Jersey (USA) Uni

We have studied the exclusive semileptonic decay mode {ital D}{sup +}{r arrow}{ital {bar K}}{sup 0}{ital e+}{nu}{sub {ital e}} in the Fermilab photoproduction experiment E691. We find the ratio of {ital B}({ital D}{sup +}{r arrow}{ital {bar K}}{sup 0}{ital e+}{nu}{sub {ital e}})/{ital B}({ital D}{sup +}{r arrow}{ital K}{sup {minus}}{pi}{sup +}{pi}{sup +}) to be 0.66{plus minus}0.09{plus minus}0.14, corresponding to a {ital D}{sup +}{r arrow}{ital {bar K}}{sup 0}{ital e+}{nu}{sub {ital e}} branching ratio of 6.1{plus minus}0.9{plus minus}1.6%. Combining this result with our measurement of the {ital D}{sup +} lifetime, we find {Gamma}({ital D}{sup +}{r arrow}{ital {bar K}}{sup 0}{ital e+}{nu}{sub {ital e}})=(5.6{plus minus}0.8{plus minus}1.5){times}10{sup 10} s{sup {minus}1}. We also find, using E691 averages, the ratio of decay rates {Gamma}({ital D}{r arrow}{ital K}{sup *}{ital e}{nu})/{Gamma}({ital D}{r arrow}{ital Ke}{nu}) to be 0.55{plus minus}0.14.

• OSTI ID: 5179445
• Journal Information: Physical Review Letters; (United States), Vol. 67:12; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
D PLUS MESONS
SEMILEPTONIC DECAY
BRANCHING RATIO
EXPERIMENTAL DATA
KOBAYASHI-MASKAWA MATRIX
MASS SPECTRA
PARTICLE KINEMATICS
TAGGED PHOTON METHOD
BOSONS
CHARM PARTICLES
CHARMED MESONS
COINCIDENCE METHODS
COUNTING TECHNIQUES
D MESONS
DATA
DECAY
ELEMENTARY PARTICLES
FIELD THEORIES
HADRONS
INFORMATION
MATRICES
MESONS
NUMERICAL DATA
PARTICLE DECAY
PSEUDOSCALAR MESONS
SPECTRA
UNIFIED-FIELD THEORIES
WEAK PARTICLE DECAY
645101* - High Energy Physics- Particle Interactions & Properties-Experimental- Electromagnetic Interactions & Properties
645102 - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties