MEASUREMENTS OF SEMILEPTONIC BRANCHING FRACTIONS OF B-MESONS AT THE UPSILON(4S) RESONANCE

被引:70
作者
HENDERSON, S
KINOSHITA, K
PIPKIN, F
PROCARIO, M
SAULNIER, M
WILSON, R
WOLINSKI, J
XIAO, D
AMMAR, R
BARINGER, P
COPPAGE, D
DAVIS, R
HAAS, P
KELLY, M
KWAK, N
LAM, H
RO, S
KUBOTA, Y
NELSON, JK
PERTICONE, D
POLING, R
SCHRENK, S
CRAWFORD, G
FULTON, R
JENSEN, T
JOHNSON, DR
KAGAN, H
KASS, R
MALCHOW, R
MORROW, F
WHITMORE, J
WILSON, P
BORTOLETTO, D
BROWN, D
DOMINICK, J
MCILWAIN, RL
MILLER, DH
MODESITT, M
SCHAFFNER, SF
SHIBATA, EI
SHIPSEY, IPJ
BATTLE, M
KROHA, H
SPARKS, K
THORNDIKE, EH
WANG, CH
ALAM, MS
KIM, IJ
LI, WC
NEMATI, B
机构
[1] UNIV KANSAS,LAWRENCE,KS 66045
[2] UNIV MINNESOTA,MINNEAPOLIS,MN 55455
[3] OHIO STATE UNIV,COLUMBUS,OH 43210
[4] PURDUE UNIV,W LAFAYETTE,IN 47907
[5] UNIV ROCHESTER,ROCHESTER,NY 14627
[6] SUNY ALBANY,ALBANY,NY 12222
[7] VANDERBILT UNIV,NASHVILLE,TN 37235
[8] CORNELL UNIV,ITHACA,NY 14853
[9] ITHACA COLL,ITHACA,NY 14850
[10] UNIV FLORIDA,GAINESVILLE,FL 32611
[11] SYRACUSE UNIV,SYRACUSE,NY 13244
来源
PHYSICAL REVIEW D | 1992年 / 45卷 / 07期
关键词
D O I
10.1103/PhysRevD.45.2212
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report new measurements of semileptonic branching fractions of B mesons produced at the gamma(4S) resonance determined by fitting the inclusive electron and muon momentum spectra to different theoretical models. Using B(BBAR --> Xl-nuBAR) to denote the average of the semileptonic branching fractions for B decay to electrons and muons, we obtain B(BBAR --> Xl-nuBAR) = (10.5 +/- 0.2 +/- 0.4)% using the refined free-quark model of Altarelli et al., and B(BBAR --> Xl-nuBAR) = (11.2 +/- 0.3 +/- 0.4)% using a modified version of the form-factor model of Isgur et al., in which the D**l-nuBAR contribution is allowed to float in the fit. The average of these two results is B(BBAR --> Xl-nuBAR) = (10.8 +/- 0.2 +/- 0.4 +/- 0.4)%, where the errors are statistical, systematic uncertainties in the measurement, and systematic uncertainties associated with the theoretical models, respectively. Semileptonic branching fractions as low as this are difficult to accommodate in theoretical models where hadronic B-meson decays arise only from spectator diagrams. We use dilepton yields to limit the uncertainty in the semileptonic branching fraction due to the possible existence of non-B BBAR decays of the gamma(4S). In addition, we tag neutral B mesons using the decays B0BAR --> D*+ pi- and B0BAR --> D*+l-nuBAR to obtain the first direct measurement of semileptonic branching fractions for neutral B mesons; the average of the electron and muon results for neutral B mesons is B(B0BAR --> Xl-nuBAR) = (9.9 +/- 3.0 +/- 0.9)%.
引用
收藏
页码:2212 / 2231
页数:20
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