Direct Measurement of the Pseudoscalar Decay Constant, fDs
Constant (computer programming)
DOI:
10.1142/9789811217739_0025
Publication Date:
2020-06-18T09:09:11Z
AUTHORS (187)
ABSTRACT
The Beijing Spectrometer (BES) experiment has observed purely leptonic decays of the D, meson in reaction e+ e---+ v; D; at a c.m. energy 4.03 GeV.Three events are which one hadronically to cfnr, K'*°K, or XVK, and other leptonically JLVI'-or TJ'T• With assumption JL-T universality, values branching fraction, B(D,.--+JLVp.) = (1.5:':6t~8:i)%, pseudoscalar decay constant, fv, (4.3:':U:':8:1)X 10 2 MeV, obtained.
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