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Measurement of the absolute branching fractions for D−s→ℓ−¯νℓ and extraction of the decay constant fDs
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The absolute branching fractions for the decays D − s → ℓ − ¯ ν ℓ ( ℓ = e , μ , or τ ) are measured using a data sample corresponding to an integrated luminosity of 521 fb − 1 collected at center-of-mass energies near 10.58 GeV with the BABAR detector at the PEP-II e + e − collider at SLAC. The number of D − s mesons is determined by reconstructing the recoiling system D K X γ in events of the type e + e − → D K X D * − s , where D * − s → D − s γ and X represents additional pions from fragmentation. The D − s → ℓ − ν ℓ events are detected by full or partial reconstruction of the recoiling system D K X γ ℓ . The branching fraction measurements are combined to determine the D − s decay constant f D s = ( 258.6 ± 6.4 ± 7.5 ) MeV , where the first uncertainty is statistical and the second is systematic.
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GARRA TICÓ, Jordi, GRAUGÉS POUS, Eugeni and BABAR Collaboration. Measurement of the absolute branching fractions for D−s→ℓ−¯νℓ and extraction of the decay constant fDs. Physical Review D. 2010. Vol. 82, num. 9, pags. 091103. ISSN 1550-7998. [consulted: 1 of July of 2026]. Available at: https://hdl.handle.net/2445/131740