Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published June 5, 1995 | Published
Journal Article Open

Direct Measurement of the Pseudoscalar Decay Constant, f_D_s

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

Published - BAIprl95.pdf

Files

BAIprl95.pdf
Files (625.1 kB)
Name Size Download all
md5:986f7316c798056ac6e9327050c7ca15
625.1 kB Preview Download

Additional details

Created:
August 20, 2023
Modified:
October 24, 2023