Improved Measurement of Absolute Branching Fraction of Ds to tau nu
CLEO Collaboration: P.U.E. Onyisi, et al
TL;DR
This paper presents an improved measurement of the branching fraction for D_s^+ to tau^+ nu_tau decay and determines the decay constant f_Ds with higher precision using data from the CLEO-c detector.
Contribution
The study provides a more precise measurement of the D_s^+ to tau^+ nu_tau branching fraction and decay constant, enhancing previous experimental results.
Findings
Branching fraction B(D_s^+ to tau^+ nu_tau) = (5.30 +- 0.47 +- 0.22)%
Decay constant f_Ds = (252.5 +- 11.1 +- 5.2) MeV
Improved precision over previous measurements
Abstract
We have studied the leptonic decay D^+_s to tau^+ nu_tau, via the decay channel tau^+ to e^+ nu_e anti-nu_tau, using a sample of tagged D_s^+ decays collected near the D^*_s D_s peak production energy in e^+ e^- collisions with the CLEO-c detector. We obtain B(D^+_s to tau^+ nu_tau) = (5.30 +- 0.47 +- 0.22) % and determine the decay constant f_Ds = (252.5 +- 11.1 +- 5.2) MeV, where the first uncertainties are statistical and the second are systematic.
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