期刊
PHYSICAL REVIEW LETTERS
卷 99, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.99.071802
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We measure the decay constant f(Ds)(+) using the D-s(+)-> l(+)nu channel, where the l(+) designates either a mu(+) or a tau(+), when the tau(+)->pi(+)(v) over bar. Using both measurements we find f(Ds)(+)= 274 +/- 13 +/- 7 MeV. Combining with our previous determination of f(D)(+), we compute the ratio f(Ds)(+)/f(D)(+)= 1.23 +/- 0.11 +/- 0.04. We compare with theoretical estimates.
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