Measurement of charmless semileptonic decays of [ital B] mesons

Using the CLEO II detector and a sample of 955 000 [Upsilon](4S) decays we have confirmed charmless semileptonic decays of [ital B] mesons. In the momentum interval 2.3--2.6 GeV/[ital c] we observe an excess of 107[plus minus]15[plus minus]11 leptons, which we attribute to [ital b][r arrow][ital ul]...

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Published in:Physical review letters 1993-12, Vol.71:25
Main Authors: Bartelt, J., Csorna, S.E., Egyed, Z., Jain, V., Akerib, D.S., Barish, B., Chadha, M., Chan, S., Cowen, D.F., Eigen, G., Miller, J.S., O'Grady, C., Urheim, J., Weinstein, A.J., Acosta, D., Athanas, M., Masek, G., Paar, H., Sivertz, M., Bean, A., Gronberg, J., Kutschke, R., Menary, S., Morrison, R.J., Nakanishi, S., Nelson, H.N., Nelson, T.K., Richman, J.D., Ryd, A., Tajima, H., Schmidt, D., Sperka, D., Witherell, M.S., Procario, M., Yang, S., Cho, K., Daoudi, M., Ford, W.T., Johnson, D.R., Lingel, K., Lohner, M., Rankin, P., Smith, J.G., Alexander, J.P., Bebek, C., Berkelman, K., Besson, D., Browder, T.E., Cassel, D.G., Cho, H.A., Coffman, D.M., Drell, P.S., Ehrlich, R., Garcia-Sciveres, M., Geiser, B., Gittelman, B., Gray, S.W., Hartill, D.L., Heltsley, B.K., Jones, C.D., Jones, S.L., Kandaswamy, J., Katayama, N., Kim, P.C., Kreinick, D.L., Ludwig, G.S., Masui, J., Mevissen, J., Mistry, N.B., Ng, C.R., Nordberg, E., Ogg, M., Patterson, J.R., Peterson, D., Riley, D., Salman, S., Sapper
Format: Article
Language:English
Subjects:
662210 > Specific Theories & Interaction Models
662420 > Properties of Mesons & Meson Resonances-- (1992-)
B MESONS
BEAUTY PARTICLES
BOSONS
CP INVARIANCE
CROSS SECTIONS
DECAY
ELEMENTARY PARTICLES
ENERGY DEPENDENCE
FIELD THEORIES
HADRONS
INVARIANCE PRINCIPLES
KOBAYASHI-MASKAWA MATRIX
MATRICES
MATRIX ELEMENTS
MESONS
Pa
PARTICLE DECAY
Particle Systematics > Unified Theories & Models > (1992-)
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PSEUDOSCALAR MESONS
SEMILEPTONIC DECAY
UNIFIED-FIELD THEORIES
WEAK PARTICLE DECAY 662350 > Decays of Mesons-- (1992-)
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Summary:Using the CLEO II detector and a sample of 955 000 [Upsilon](4S) decays we have confirmed charmless semileptonic decays of [ital B] mesons. In the momentum interval 2.3--2.6 GeV/[ital c] we observe an excess of 107[plus minus]15[plus minus]11 leptons, which we attribute to [ital b][r arrow][ital ul][nu]. This result yields a model-dependent range of values for [vert bar][ital V][sub [ital u][ital b]]/[ital V][sub [ital c][ital b]][vert bar] that is lower than has been obtained in previous studies. For the inclusive spectator model of Altarelli [ital et] [ital al]. we find [vert bar][ital V][sub [ital u][ital b]]/[ital V][sub [ital c][ital b]][vert bar]=0.076[plus minus]0.008. Models that describe [ital b][r arrow][ital ul][nu] with a limited set of exclusive final states give [vert bar][ital V][sub [ital u][ital b]]/[ital V][sub [ital c][ital b]][vert bar]=0.06[minus]0.10.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.71.4111