期刊
PHYSICAL REVIEW D
卷 82, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.82.091103
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资金
- SLAC
- DOE
- NSF (USA)
- NSERC (Canada)
- CEA
- CNRS (France) [CNRS-IN2P3]
- BMBF
- DFG (Germany)
- INFN (Italy)
- FOM (The Netherlands)
- NFR (Norway)
- MES (Russia)
- MICIIN (Spain)
- STFC (United Kingdom)
- Marie Curie EIF (European Union)
- A. P. Sloan Foundation (USA)
- Binational Science Foundation (USA-Israel)
- Science and Technology Facilities Council [ST/H001166/1, PP/E003095/1, PP/E000444/1, ST/H000992/1, ST/I000097/1] Funding Source: researchfish
- STFC [ST/H000992/1, ST/H001166/1, PP/E003095/1, ST/I000097/1] Funding Source: UKRI
The absolute branching fractions for the decays D-s(-) -> l(-) (nu) over bar (l) (l = e, mu, or tau) 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 DKX gamma in events of the type e(+)e(-) -> DKXDs*(-), where D-s*(-) -> D-s(-) gamma and X represents additional pions from fragmentation. The D-s(-) -> l(-) nu(l) events are detected by full or partial reconstruction of the recoiling system DKX gamma l. The branching fraction measurements are combined to determine the D-s(-) decay constant f(Ds) (258.6 +/- 6.4 +/- 7:5) MeV, where the first uncertainty is statistical and the second is systematic.
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