Bai, J. Z. and Hatanaka, M. and Hitlin, D. G. and Jones, L. and Kelsey, M. H. and Oyang, J. and Panetta, J. and Porter, F. and Prabhakar, E. (1995) Direct Measurement of the Pseudoscalar Decay Constant, f_D_s. Physical Review Letters, 74 (23). pp. 4599-4602. ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:20120215-145754333
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The Beijing Spectrometer (BES) experiment has observed purely leptonic decays of the D_s meson in the reaction e^+e^-→D_s^+D_s^- at a c.m. energy of 4.03 GeV. Three events are observed in which one D_s decays hadronically to φπ, K̅ ^(*0)K, or K̅^0K, and the other decays leptonically to μν_μ or τν_τ. With the assumption of μ-τ universality, values of the branching fraction, B(D_s→μν_μ) = (1.5_(-0.6-0.2)^(+1.3+0.3))%, and the D_s pseudoscalar decay constant, f_D_s = (4.3_(-1.3-0.4)^(+1.5+0.4))×10^2 MeV, are obtained.
|Additional Information:||© 1995 The American Physical Society. Received 22 December 1994; published in the issue dated 5 June 1995. We would like to thank the staffs of the BEPC accelerator, the Computing Center at the Institute of High Energy Physics (Beijing), and the Texas High Performance Computing Center. We thank Professor Chaohsi Chang for useful discussions of Ds physics. Work supported in part by the National Natural Science Foundation of China under Contract No. 19290400 and the Chinese Academy of Sciences under Contract No. KJ85 (IHEP); by the Department of Energy under Contract No. DE-FG02-91ER40676 (Boston University), No. DE-FG03-92ER40701 (Caltech), No. DE-FG03- 93ER40788 (Colorado State University), No. DE-AC02- 76ER03069 (MIT), No. DE-AC03-76SF00515 (SLAC), No. DE-FG03-91ER40679 (UC Irvine), No. DE-FG03- 94ER40833 (U Hawaii), No. DE-FG05-92ER40736 (UT Dallas), and No. DE-AC35-89ER40486 (SSC Lab); by the U.S. National Science Foundation, Grant No. PHY9203212 (University of Washington); and by the Texas National Research Laboratory Commission under Contract No. RGFY91B5, No. RGFY92B5 (Colorado State), and No. RCFY93-316H (UT Dallas).|
|Classification Code:||PACS: 13.20.Fc, 14.40.Lb|
|Official Citation:||Direct Measurement of the Pseudoscalar Decay Constant, fDs J. Z. Bai et al. (BES Collaboration) pp. 4599-4602|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||15 Feb 2012 23:30|
|Last Modified:||26 Dec 2012 14:50|
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