Measurement of the ratio of branching fractions of the Υ(4S) to charged and neutral B mesons -: art. no. 052003

被引：26

作者：

Athar, SB ^{[1
]}

Avery, P

Stoeck, H

Yelton, J

Brandenburg, G

Ershov, A

Kim, DYJ

Wilson, R

Benslama, K

Eisenstein, BI

Ernst, J

Gollin, GD

Hans, RM

Karliner, I

Lowrey, N

Marsh, MA

Plager, C

Sedlack, C

Selen, M

Thaler, JJ

Williams, J

Edwards, KW

Ammar, R

Besson, D

Zhao, X

Anderson, S

Frolov, VV

Kubota, Y

Lee, SJ

Li, SZ

Poling, R

Smith, A

Stepaniak, CJ

Urheim, J

Ahmed, S

Alam, MS

Jian, L

Saleem, M

Wappler, F

Eckhart, E

Gan, KK

Gwon, C

Hart, T

Honscheid, K

Hufnagel, D

Kagan, H

Kass, R

Pedlar, TK

Thayer, JB

von Toerne, E

机构：

[1] Univ Florida, Gainesville, FL 32611 USA

[2] Harvard Univ, Cambridge, MA 02138 USA

[3] Univ Illinois, Urbana, IL 61801 USA

[4] Carleton Univ, Ottawa, ON K1S 5B6, Canada

[5] Inst Particle Phys, Toronto, ON M5S 1A7, Canada

[6] Univ Kansas, Lawrence, KS 66045 USA

[7] Univ Minnesota, Minneapolis, MN 55455 USA

[8] SUNY Albany, Albany, NY 12222 USA

[9] Ohio State Univ, Columbus, OH 43210 USA

[10] Univ Oklahoma, Norman, OK 73019 USA

[11] Univ Pittsburgh, Pittsburgh, PA 15260 USA

[12] Purdue Univ, W Lafayette, IN 47907 USA

[13] Univ Rochester, Rochester, NY 14627 USA

[14] So Methodist Univ, Dallas, TX 75275 USA

[15] Syracuse Univ, Syracuse, NY 13244 USA

[16] Univ Texas Pan Amer, Edinburg, TX 78539 USA

[17] Vanderbilt Univ, Nashville, TN 37235 USA

[18] Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA

[19] Wayne State Univ, Detroit, MI 48202 USA

[20] CALTECH, Pasadena, CA 91125 USA

[21] Univ Calif San Diego, La Jolla, CA 92093 USA

[22] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA

[23] Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA

[24] Cornell Univ, Ithaca, NY 14853 USA

来源：

PHYSICAL REVIEW D | 2002年 / 66卷 / 05期

关键词：

D O I：

10.1103/PhysRevD.66.052003

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The ratio of charged and neutral B meson production at the Y(4S), f(+-)/f(00), is measured through the decays (B) over bar->D*l(-)(ν) over barl, reconstructed using a partial reconstruction method where the D* is detected only through a pion daughter from the decay D*-->Dpi. Using data collected by the CLEO II detector, the charged and neutral B decays are measured in such a way that their ratio is independent of the decay model, limited mainly by the uncertainty in the relative efficiency for detecting neutral and charged pions. This measurement yields the ratio of production fractions times the ratio of semileptonic branching fractions, f(+-)b(+)/f(00)b(0). Assuming that b(+)/b(0) is equal to the lifetime ratio tau(+)/tau(0) and using the world average value of tau(+)/tau(0) as input, we obtain f(+-)/f(00)=1.058+/-0.084+/-0.136.

引用

页数：9

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