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Measurement of the pseudoscalar decay constant fDs using Ds+→τ+ν, τ+→ρ+ν̄ decays

Abstract:

Analyzing 600pb-1 of e+e- collisions at 4170 MeV center-of-mass energy with the CLEO-c detector, we measure the branching fraction B(Ds+→τ+ν)= (5.52±0.57±0.21)% using the τ+→ρ+ν̄ decay mode. Combining with other CLEO measurements of B(Ds+→τ+ν) we determine the pseudoscalar decay constant fDs=(259.7±7.8±3.4)MeV consistent with the value obtained from our Ds+→μ+ν measurement of (257.6±10.3±4.3)MeV. Combining these measurements we find a value of fDs=(259.0±6.2±3.0)MeV, that differs from the mos...

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Publisher copy:
10.1103/PhysRevD.80.112004

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Journal:
Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume:
80
Issue:
11
Publication date:
2009-12-28
DOI:
EISSN:
1550-2368
ISSN:
1550-7998
URN:
uuid:b1c52364-b7ac-4d15-8b22-e872c439b80d
Source identifiers:
149266
Local pid:
pubs:149266
Language:
English

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