The electron spectrum from B meson decays
Creators
- Wachs, K.1
- Bartels, H.W.1
- Bienlein, J.K.1
- Brockmueller, K.1
- Drews, G.1
- Koch, W.1
- Marsiske, H.1
- Meyer, H.1
- Selonke, F.1
- Skwarnicki, T.1
- Voigt, A.1
- Antreasyan, D.2
- Irion, J.2
- McBride, P.2
- Strauch, K.2
- Williams, D.2
- Bieler, C.3
- Graaf, K.3
- Heimlich, F.H.3
- Heinsius, F.H.3
- Kiel, T.3
- Krueger, S.3
- Lekebusch, R.3
- Maschmann, W.3
- Pegel, C.3
- Sievers, D.3
- Stock, V.3
- Strohbusch, U.3
- Bizzeti, A.4, 5
- Cartacci, A.4, 5
- Compagnucci, A.4, 5
- Conforto, G.4, 5
- Landi, G.4, 5
- Monteleoni, B.4, 5
- Pelfer, P.G.4, 5
- Bloom, E.D.6, 7, 8
- Clare, R.6, 7, 8
- Cooper, S.6, 7, 8
- Fairfield, K.6, 7, 8
- Gelphman, D.6, 7, 8
- Godfrey, G.6, 7, 8
- Hofstadter, R.6, 7, 8
- Kirkbride, I.6, 7, 8
- Leffler, S.6, 7, 8
- Litke, A.M.6, 7, 8
- Lowe, S.6, 7, 8
- Niczyporuc, B.6, 7, 8
- Schwarz, A.6, 7, 8
- Tompkins, J.6, 7, 8
- Uitert, B. van6, 7, 8
- Wacker, K.6, 7, 8
- Cavalli-Sforza, M.9
- Coyne, D.9
- Folger, G.10
- Glaser, G.10
- Kobel, M.10
- Lurz, B.10
- Schuette, J.10
- Volland, U.10
- Wegener, H.10
- Fridman, A.11
- Karch, K.11
- Keh, S.11
- Kilian, H.11
- Koenigsmann, K.11
- Scheer, M.11
- Schmitt, P.11
- Jakubowski, Z.12
- Muryn, B.12
- Nowak, G.12
- Koenig, A.C.13, 14
- Metzger, W.J.13, 14
- Reidenbach, M.13, 14
- Schotanus, J.13, 14
- Walle, R.T. van de13, 14
- Walk, W.13, 14
- Peck, C.15
- Porter, F.C.15
- Crystal Ball Collaboration
- 1. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany, F.R.)
- 2. Harvard Univ., Cambridge, MA (USA)
- 3. Hamburg Univ. (Germany, F.R.). 1. Inst. fuer Experimentalphysik
- 4. Florence Univ. (Italy)
- 5. Istituto Nazionale di Fisica Nucleare, Florence (Italy)
- 6. Stanford Linear Accelerator Center, CA (USA)
- 7. Stanford Univ., CA (USA). High-Energy Physics Lab.
- 8. Stanford Univ., CA (USA). Dept. of Physics
- 9. California Univ., Santa Cruz (USA)
- 10. Erlangen-Nuernberg Univ., Erlangen (Germany, F.R.)
- 11. Wuerzburg Univ. (Germany, F.R.)
- 12. Institute of Nuclear Physics, Krakow (Poland)
- 13. Nationaal Inst. voor Kernfysica en Hoge-Energiefysica (NIKHEF), Nijmegen (Netherlands)
- 14. Katholieke Univ. Nijmegen (Netherlands)
- 15. California Inst. of Tech., Pasadena (USA)
Description
The Crystal Ball Collaboration has measured the energy spectrum of electrons from semileptonic B meson decays at the e+e- storage ring DORIS II. Branching ratios and weak mixing angles of the Kobaysashi-Maskawa matrix are determined using several models for the hadronic matrix elements. We obtain the branching ratio for semileptonic B decays to charmed states BR(B → eνXc) = (11.7 ± 0.4 ± 1.0)%. Our result for the corresponding Kobaysashi-Maskawa matrix element is vertical strokeVcbvertical stroke = 0.052 ± 0.006. The model dependence of both results is included in the error. We have not observed semileptonic B decays to non-charmed mesons. Analyzing the measured electron spectrum above 2.4 GeV, where no b → c decays contribute, we find BR(B → eνXu)/BR (B → eνXc) < 6.5% at the 90% confidence level. This corresponds to an upper limit vertical strokeVub/Vcbvertical stroke < 0.21. (orig.)
Additional details
Publishing Information
- Journal Title
- Zeitschrift fuer Physik, C
- Journal Volume
- 42
- Journal Issue
- 1
- Series
- Z. Phys., C.
- Journal Page Range
- 33-48
- ISSN
- 0170-9739
- CODEN
- ZPCFD
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 20020992
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- ANNIHILATION; B MESONS; BRANCHING RATIO; CHARM PARTICLES; ELECTRON SPECTRA; ELECTRON-POSITRON INTERACTIONS; ENERGY DEPENDENCE; ENERGY SPECTRA; EXCITATION FUNCTIONS; EXPERIMENTAL DATA; GEV RANGE 10-100; INCLUSIVE INTERACTIONS; KOBAYASHI-MASKAWA MATRIX; LIMITING VALUES; MATRIX ELEMENTS; MIXING RATIO; MULTIPLE PRODUCTION; MULTIPLICITY; PAIR PRODUCTION; SEMILEPTONIC DECAY; TOTAL CROSS SECTIONS
- Descriptors DEC
- BEAUTY PARTICLES; BOSONS; CROSS SECTIONS; DATA; DECAY; ELEMENTARY PARTICLES; ENERGY RANGE; GEV RANGE; HADRONS; INFORMATION; INTERACTIONS; LEPTON-LEPTON INTERACTIONS; MATRICES; MESONS; NUMERICAL DATA; PARTICLE DECAY; PARTICLE INTERACTIONS; PARTICLE PRODUCTION; PSEUDOSCALAR MESONS; SPECTRA; WEAK PARTICLE DECAY