OBSERVATION OF B-MESON SEMILEPTONIC DECAYS TO NONCHARMED FINAL-STATES

被引：158

作者：

FULTON, R

HEMPSTEAD, M

JENSEN, T

JOHNSON, DR

KAGAN, H

KASS, R

MORROW, F

WHITMORE, J

WILSON, P

CHEN, WY

MCILWAIN, RL

MILLER, DH

NG, CR

SCHAFFNER, SF

SHIBATA, EI

YAO, WM

SPARKS, K

THORNDIKE, EH

WANG, CH

BROCK, IC

FERGUSON, T

ALAM, MS

KIM, IJ

LI, WC

LOU, XC

SUN, CR

WANG, PN

ZOELLER, MI

BORTOLETTO, D

GOLDBERG, M

HORWITZ, N

JAIN, V

MESTAYER, MD

MONETI, GC

SHARMA, V

SHIPSEY, IPJ

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

机构：

[1] PURDUE UNIV,W LAFAYETTE,IN 47907

[2] UNIV ROCHESTER,ROCHESTER,NY 14627

[3] CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213

[4] SUNY ALBANY,ALBANY,NY 12222

[5] SYRACUSE UNIV,SYRACUSE,NY 13210

[6] VANDERBILT UNIV,NASHVILLE,TN 37235

[7] CORNELL UNIV,ITHACA,NY 14853

[8] ITHACA COLL,ITHACA,NY 14850

[9] UNIV FLORIDA,GAINESVILLE,FL 32611

[10] HARVARD UNIV,CAMBRIDGE,MA 02138

[11] UNIV KANSAS,LAWRENCE,KS 66045

[12] UNIV MARYLAND,COLLEGE PK,MD 20742

[13] UNIV MINNESOTA,MINNEAPOLIS,MN 55455

来源：

PHYSICAL REVIEW LETTERS | 1990年 / 64卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.64.16

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the first evidence of charmless semileptonic decays of B mesons. In the momentum interval 2.42.6 GeV/c where the background from bcl is negligible, the average of the measured ue and u partial branching ratios is Bub(2.4,2.6) =(1.80.40.3)×10-4. Inclusion of data from the interval 2.22.4 GeV/c, where the lepton yield is dominated by bcl, gives Bub(2.2,2.6) =(3.30.80.8)×10-4. Vub/Vcb depends on the theoretical model of bul decay and is approximately 0.1. © 1990 The American Physical Society.

引用

页码：16 / 20

页数：5

共 23 条

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