Published June 5, 1995
| Published
Journal Article
Open
Direct Measurement of the Pseudoscalar Decay Constant, f_D_s
Chicago
Abstract
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).Attached Files
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Additional details
- Eprint ID
- 29312
- Resolver ID
- CaltechAUTHORS:20120215-145754333
- National Natural Science Foundation of China
- 19290400
- Chinese Academy of Sciences
- KJ85
- Department of Energy (DOE)
- DE-FG02-91ER40676
- Department of Energy (DOE)
- DE-FG03-92ER40701
- Department of Energy (DOE)
- DE-FG03-93ER40788
- Department of Energy (DOE)
- DE-AC02-76ER03069
- Department of Energy (DOE)
- DE-AC03-76SF00515
- Department of Energy (DOE)
- DE-FG03-91ER40679
- Department of Energy (DOE)
- DE-FG03-94ER40833
- Department of Energy (DOE)
- DE-FG05-92ER40736
- Department of Energy (DOE)
- DE-AC35-89ER40486
- NSF
- PHY9203212
- Texas National Research Laboratory Commission
- RGFY91B5
- Texas National Research Laboratory Commission
- RGFY92B5
- Texas National Research Laboratory Commission
- RCFY93-316H
- Created
-
2012-02-15Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field