Measurement of the B semileptonic branching fraction with lepton tags

被引：101

作者：

Barish, B

Chadha, M

Chan, S

Eigen, G

Miller, JS

OGrady, C

Urheim, J

Weinstein, AJ

Wurthwein, F

Asner, DM

Athanas, M

Bliss, DW

Brower, WS

Masek, G

Paar, HP

Gronberg, J

Korte, CM

Kutschke, R

Menary, S

Morrison, RJ

Nakanishi, S

Nelson, HN

Nelson, TK

Qiao, C

Richman, JD

Roberts, D

Ryd, A

Tajima, H

Witherell, MS

Balest, R

Cho, K

Ford, WT

Lohner, M

Park, H

Rankin, P

Smith, JG

Alexander, JP

Bebek, C

Berger, BE

Berkelman, K

Bloom, K

Browder, TE

Cassel, DG

Cho, HA

Coffman, DM

Crowcroft, DS

Dickson, M

Drell, PS

Dumas, DJ

Ehrlich, R

机构：

[1] UNIV HAWAII,HONOLULU,HI 96802

[2] UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093

[3] UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106

[4] UNIV COLORADO,BOULDER,CO 80309

[5] CORNELL UNIV,ITHACA,NY 14853

[6] UNIV FLORIDA,GAINESVILLE,FL 32611

[7] HARVARD UNIV,CAMBRIDGE,MA 02138

[8] UNIV ILLINOIS,CHAMPAIGN,IL 61801

[9] CARLETON UNIV,OTTAWA,ON K1S 5B6,CANADA

[10] INST PARTICLE PHYS,MONTREAL,PQ,CANADA

[11] MCGILL UNIV,MONTREAL,PQ H3A 2T8,CANADA

[12] ITHACA COLL,ITHACA,NY 14850

[13] UNIV KANSAS,LAWRENCE,KS 66045

[14] UNIV MINNESOTA,MINNEAPOLIS,MN 55455

[15] SUNY ALBANY,ALBANY,NY 12222

[16] OHIO STATE UNIV,COLUMBUS,OH 43210

[17] UNIV OKLAHOMA,NORMAN,OK 73019

[18] PURDUE UNIV,W LAFAYETTE,IN 47907

[19] UNIV ROCHESTER,ROCHESTER,NY 14627

[20] SO METHODIST UNIV,DALLAS,TX 75275

[21] SYRACUSE UNIV,SYRACUSE,NY 13244

[22] VANDERBILT UNIV,NASHVILLE,TN 37235

[23] VIRGINIA POLYTECH INST & STATE UNIV,BLACKSBURG,VA 24061

来源：

PHYSICAL REVIEW LETTERS | 1996年 / 76卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.76.1570

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have used the CLEO II detector and 2.06 fb(-1) of Y(4S) data to measure the B-meson semileptonic branching fraction. The B --> Xe nu momentum spectrum was obtained over nearly the full momentum range by using charge and kinematic correlations in events with a high-momentum lepton tag and an additional electron. We find B(B --> Xe nu) = (10.49 +/- 0.17 +/- 0.43)%, with overall systematic uncertainties less than those of untagged single-lepton measurements. We use this result to calculate the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element V-cb and to set an upper limit on the fraction of Y(4S) decays to final states other than B (B) over bar.

引用

页码：1570 / 1574

页数：5

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