Measurement of B(Ds+ → l plus v) and the decay constant fDs+ from 600 pb-1 of e+e- annihilation data near 4170 MeV

被引：74

作者：

Alexander, J. P. ^{[1
]}

Cassel, D. G. ^{[1
]}

Duboscq, J. E. ^{[1
]}

Ehrlich, R. ^{[1
]}

Fields, L. ^{[1
]}

Galik, R. S. ^{[1
]}

Gibbons, L. ^{[1
]}

Gray, R. ^{[1
]}

Gray, S. W. ^{[1
]}

Hartill, D. L. ^{[1
]}

Heltsley, B. K. ^{[1
]}

Hertz, D. ^{[1
]}

Hunt, J. M. ^{[1
]}

Kandaswamy, J. ^{[1
]}

Kreinick, D. L. ^{[1
]}

Kuznetsov, V. E. ^{[1
]}

Ledoux, J. ^{[1
]}

Mahlke-Krueger, H. ^{[1
]}

Mohapatra, D. ^{[1
]}

Patterson, J. R. ^{[1
]}

Peterson, D. ^{[1
]}

Riley, D. ^{[1
]}

Ryd, A. ^{[1
]}

Sadoff, A. J. ^{[1
]}

Shi, X. ^{[1
]}

Stroiney, S. ^{[1
]}

Sun, W. M. ^{[1
]}

Wilksen, T. ^{[1
]}

Yelton, J. ^{[2
]}

Rubin, P. ^{[3
]}

Lowrey, N. ^{[4
]}

Mehrabyan, S. ^{[4
]}

Selen, M. ^{[4
]}

Wiss, J. ^{[4
]}

Mitchell, R. E. ^{[5
]}

Shepherd, M. R. ^{[5
]}

Besson, D. ^{[6
]}

Pedlar, T. K. ^{[7
]}

Cronin-Hennessy, D. ^{[8
]}

Gao, K. Y. ^{[8
]}

Hietala, J. ^{[8
]}

Kubota, Y. ^{[8
]}

Klein, T. ^{[8
]}

Poling, R. ^{[8
]}

Scott, A. W. ^{[8
]}

Zweber, P. ^{[8
]}

Dobbs, S. ^{[9
]}

Metreveli, Z. ^{[9
]}

Seth, K. K. ^{[9
]}

Tan, B. J. Y. ^{[9
]}

机构：

[1] Cornell Univ, Ithaca, NY 14853 USA

[2] Univ Florida, Gainesville, FL 32611 USA

[3] George Mason Univ, Fairfax, VA 22030 USA

[4] Univ Illinois, Urbana, IL 61801 USA

[5] Indiana Univ, Bloomington, IN 47405 USA

[6] Univ Kansas, Lawrence, KS 66045 USA

[7] Luther Coll, Decorah, IA 52101 USA

[8] Univ Minnesota, Minneapolis, MN 55455 USA

[9] Northwestern Univ, Evanston, IL 60208 USA

[10] Univ Oxford, Oxford OX1 3RH, England

[11] Univ Puerto Rico, Mayaguez, PR 00681 USA

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

[13] Rensselaer Polytech Inst, Troy, NY 12180 USA

[14] Rice Univ, Houston, TX 77005 USA

[15] Univ Rochester, Rochester, NY 14627 USA

[16] Syracuse Univ, Syracuse, NY 13244 USA

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

[18] Univ Bristol, Bristol BS8 1TL, Avon, England

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

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

[21] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

来源：

PHYSICAL REVIEW D | 2009年 / 79卷 / 05期

基金：

加拿大自然科学与工程研究理事会; 英国科学技术设施理事会; 美国国家科学基金会;

关键词：

QED RADIATIVE-CORRECTIONS; UNIVERSAL MONTE-CARLO; RELATIVISTIC TREATMENT; PSEUDOSCALAR MESONS; LEPTONIC DECAYS; LIGHT; PHOTOS; QCD;

D O I：

10.1103/PhysRevD.79.052001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We examine e(+)e(-) -> D-s(-) D-s*(+) and D-s*(-) D-s(+) interactions at 4170 MeV using the CLEO-c detector in order to measure the decay constant f(Ds+) with good precision. Previously our measurements were substantially higher than the most precise lattice based QCD calculation of (241 +/- 3) MeV. Here we use the D-s(+) -> l(+) v channel, where the l(+) designates either a mu(+) or a tau(+) when the tau(+) -> pi(+) (v) over bar Analyzing both modes independently, we determine B(D-s(+) -> mu(+)v) = (0.565 +/- 0.045 +/- 0.017)%, and B(D-s(+) -> tau(+) v) = (6.42 +/- 0.81 +/- 0.18)%. We also analyze them simultaneously to find an effective value of B-eff(D-s(+) -> mu(+)v) = (0.591 +/- 0.037 +/- 0.018)% and f(Ds+) = (263.3 +/- 8.2 +/- 3.9) MeV. Combining with the CLEO-c value determined independently using D-s(+) -> tau(+) v, tau(+) -> e(+) v (v) over bar decays, we extract f(Ds+) = (259.5 +/- 6.6 +/- 3.1) MeV. Combining with our previous determination of B(D+ -> mu(+)v), we extract the ratio f(Ds+) / f(D+) = 1.26 +/- 0.06 +/- 0.02. No evidence is found for a CP asymmetry between Gamma(D-s(+) -> mu(+)v) and Gamma(D-s(-) -> mu(+)v); specifically the fractional difference in rates is measured to be (4.8 +/- 6.1)%. Finally, we find B(D-s(+) -> e(+)v) < 1.2 x 10(-4) at 90% confidence level.

引用

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