Observation of B-meson semileptonic decays to noncharmed final states

We report the first evidence of charmless semileptonic decays of {ital B} mesons. In the momentum interval 2.4--2.6 GeV/{ital c} where the background from {ital b}{r arrow}{ital cl}{nu} is negligible, the average of the measured {ital b}{r arrow}{ital ue}{nu} and {ital b}{r arrow}{ital u}{mu}{nu} pa...

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Veröffentlicht in:	Physical review letters 1990-01, Vol.64 (1), p.16-20
Hauptverfasser:	Fulton, R, Hempstead, M, Jensen, T, Johnson, DR, Kagan, H, Kass, R, Morrow, F, Whitmore, J, Wilson, P, Chen, W, McIlwain, RL, Miller, DH, Ng, CR, Schaffner, SF, Shibata, EI, Yao, W, Sparks, K, Thorndike, EH, Wang, C, Brock, IC, Ferguson, T, Alam, MS, Kim, IJ, Li, WC, Lou, XC, Sun, CR, Wang, P, Zoeller, MI, Bortoletto, D, Goldberg, M, Horwitz, N, Jain, V, V, Mestayer, MD, Moneti, GC, Sharma, V, V, Shipsey, IP, Skwarnicki, T, Thulasidas, M, Csorna, SE, Letson, T, Alexander, J, Artuso, M, Bebek, C, Berkelman, K, Cassel, DG, Cheu, E, Coffman, DM, Crawford, G, DeWire, JW, Drell, PS, Ehrlich, R, Galik, RS, Gittelman, B, Gray, SW, Halling, AM, Hartill, DL, Heltsley, BK, Kandaswamy, J, Katayama, N, Kreinick, DL, Lewis, JD, Mistry, NB, Mueller, J, Namjoshi, R
Format:	Artikel
Sprache:	eng
Schlagworte:	645102 - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties ACCELERATORS B MESONS BOSONS BOTTOMONIUM BRANCHING RATIO CHARM PARTICLES CORNELL 10-GEV SYNCHROTRON CYCLIC ACCELERATORS DATA DECAY ELEMENTARY PARTICLES ENERGY RANGE EXPERIMENTAL DATA FERMIONS FIELD THEORIES GEV RANGE GEV RANGE 01-10 HADRONS INFORMATION KOBAYASHI-MASKAWA MATRIX LEPTONS MATRICES MATRIX ELEMENTS MESONS NUMERICAL DATA PARTICLE DECAY PARTICLE IDENTIFICATION PARTICLE PRODUCTION PHYSICS OF ELEMENTARY PARTICLES AND FIELDS PSEUDOSCALAR MESONS QUARKONIUM SEMILEPTONIC DECAY SYNCHROTRONS UNIFIED-FIELD THEORIES UPSILON-10860 MESONS VECTOR MESONS WEAK PARTICLE DECAY
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Zusammenfassung:	We report the first evidence of charmless semileptonic decays of {ital B} mesons. In the momentum interval 2.4--2.6 GeV/{ital c} where the background from {ital b}{r arrow}{ital cl}{nu} is negligible, the average of the measured {ital b}{r arrow}{ital ue}{nu} and {ital b}{r arrow}{ital u}{mu}{nu} partial branching ratios is {Delta}{ital B}{sub {ital ub}}(2.4,2.6) =(1.8{plus minus}0.4{plus minus}0.3){times}10{sup {minus}4}. Inclusion of data from the interval 2.2--2.4 GeV/{ital c}, where the lepton yield is dominated by {ital b}{r arrow}{ital cl}{nu}, gives {Delta}{ital B}{sub {ital ub}}(2.2,2.6) =(3.3{plus minus}0.8{plus minus}0.8){times}10{sup {minus}4}. {vert bar}{ital V}{sub {ital ub}}/V{sub cb}{vert bar} depends on the theoretical model of {ital b}{r arrow}{ital ul}{nu} decay and is approximately 0.1.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.64.16