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Measurement of the absolute branching fraction of Ds+ --> tau+ nutau decay |
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| Authors: | Ecklund K M Love W Savinov V Lopez A Mendez H Ramirez J Ge J Y Miller D H Shipsey I P J Xin B Adams G S Anderson M Cummings J P Danko I Hu D Moziak B Napolitano J He Q Insler J Muramatsu H Park C S Thorndike E H Yang F Artuso M Blusk S Khalil S Li J Mountain R Nisar S Randrianarivony K Sultana N Skwarnicki T Stone S Wang J C Zhang L M Bonvicini G Cinabro D Dubrovin M Lincoln A Rademacker J Asner D M Edwards K W Naik P Reed J Briere R A Ferguson T Tatishvili G Vogel H Watkins M E Rosner J L Alexander J P Cassel D G Duboscq J E Ehrlich R Fields L Gibbons L Gray R Gray S W Hartill D L |
| Affiliation: | State University of New York at Buffalo, Buffalo, New York 14260, USA. |
| Abstract: | 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 study the leptonic decay D(s)(+)-->tau(+)nu(tau) via the decay channel tau(+)-->e(+)nu(e)nu(tau). We measure B(D(s)(+)-->tau(+)nu(tau))=(6.17+/-0.71+/-0.34)%, where the first error is statistical and the second systematic. Combining this result with our measurements of D(s)(+)-->mu(+)nu(mu) and D(s)(+)-->tau(+)nu(tau) (via tau(+)-->pi(+)nu(tau)), we determine f(D(s))=(274+/-10+/-5) MeV. |
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