Study of the B-0 semileptonic decay spectrum at the Y(4S) resonance

被引：6

作者：

Artuso, M

Efimov, A

Frasconi, F

Gao, M

Goldberg, M

He, D

Kopp, S

Moneti, GC

Mountain, R

Mukhin, Y

Schuh, S

Skwarnicki, T

Stone, S

Viehhauser, G

Xing, X

Bartelt, J

Csorna, SE

Jain, V

Marka, S

Freyberger, A

Godang, R

Kinoshita, K

Lai, IC

Pomianowski, P

Schrenk, S

Bonvicini, G

Cinabro, D

Greene, R

Perera, LP

Barish, B

Chadha, M

Chan, S

Eigen, G

Miller, JS

OGrady, C

Schmidtler, M

Urheim, J

Weinstein, AJ

Wurthwein, F

Asner, D

Bliss, DW

Brower, WS

Masek, G

Paar, HP

Sharma, V

Gronberg, J

Kutschke, R

Lange, DJ

Menary, S

Morrison, RJ

机构：

[1] VANDERBILT UNIV,NASHVILLE,TN 37235

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

[3] WAYNE STATE UNIV,DETROIT,MI 48202

[4] CALTECH,PASADENA,CA 91125

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

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

[7] UNIV COLORADO,BOULDER,CO 80309

[8] CORNELL UNIV,ITHACA,NY 14853

[9] UNIV FLORIDA,GAINESVILLE,FL 32611

[10] HARVARD UNIV,CAMBRIDGE,MA 02138

[11] UNIV HAWAII MANOA,HONOLULU,HI 96822

[12] UNIV ILLINOIS,CHAMPAIGN,IL 61801

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

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

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

[16] ITHACA COLL,ITHACA,NY 14850

[17] UNIV KANSAS,LAWRENCE,KS 66045

[18] UNIV MINNESOTA,MINNEAPOLIS,MN 55455

[19] SUNY ALBANY,ALBANY,NY 12222

[20] OHIO STATE UNIV,COLUMBUS,OH 43210

[21] UNIV OKLAHOMA,NORMAN,OK 73019

[22] PURDUE UNIV,W LAFAYETTE,IN 47907

[23] UNIV ROCHESTER,ROCHESTER,NY 14627

[24] STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309

[25] SO METHODIST UNIV,DALLAS,TX 75275

[26] BINP,RU-630090 NOVOSIBIRSK,RUSSIA

[27] UNIV TEXAS,AUSTIN,TX 78712

[28] LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551

来源：

PHYSICS LETTERS B | 1997年 / 399卷 / 3-4期

基金：

加拿大自然科学与工程研究理事会; 美国国家科学基金会;

关键词：

D O I：

10.1016/S0370-2693(97)00336-5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have made a first measurement of the lepton momentum spectrum in a sample of events enriched in neutral B's through a partial reconstruction of B-0 --> D*(-)l(+)<(nu)over bar>. This spectrum, measured with 2.38 fb(-1) of data collected at the Y(4S) resonance by the CLEO II detector, is compared directly to the inclusive lepton spectrum from all Y(4S) events in the same data set. These two spectra are consistent with having the same shape above 1.5 GeV/c. From the two spectra and two other CLEO measurements, we obtain the B-0 and B+ semileptonic branching fractions, b(0) and b(+), their ratio, and the production ratio f(+-)/f(00) of B+ and B-0 pairs at the Y(4S). We report b(+)/b(0) = 0.950(-0.080) (+0.117) +/- 0.091, b(0) = (10.78 +/- 0.60 +/- 0.69)%, and b(+) = (10.25 +/- 0.57 +/- 0.65)%. b(+)/b(0) is equivalent to the ratio of charged to neutral B lifetimes, tau(+)/tau(0). (C) 1997 Published by Elsevier Science B.V.

引用

页码：321 / 328

页数：8

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