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EnglishThe absolute branching fractions for the decays Ds-→ℓ-ν̅ 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 Ds- mesons is determined by reconstructing the recoiling system DKXγ in events of the type e+e-→DKXDs*-, where Ds*-→Ds-γ and X represents additional pions from fragmentation. The Ds-→ℓ-νℓ events are detected by full or partial reconstruction of the recoiling system DKXγℓ. The branching fraction measurements are combined to determine the Ds- decay constant fDs=(258.6±6.4±7.5) MeV, where the first uncertainty is statistical and the second is systematic.
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| Titolo: | Measurement of the Absolute Branching Fractions for D−s→ℓ−νˉℓ and Extraction of the Decay Constant fDs. |
| Autori: | |
| Data di pubblicazione: | 2010 |
| Rivista: | |
| Abstract: | The absolute branching fractions for the decays Ds-→ℓ-ν̅ ℓ (ℓ=e, μ, or τ) are measured using a da...ta 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 Ds- mesons is determined by reconstructing the recoiling system DKXγ in events of the type e+e-→DKXDs*-, where Ds*-→Ds-γ and X represents additional pions from fragmentation. The Ds-→ℓ-νℓ events are detected by full or partial reconstruction of the recoiling system DKXγℓ. The branching fraction measurements are combined to determine the Ds- decay constant fDs=(258.6±6.4±7.5) MeV, where the first uncertainty is statistical and the second is systematic. |
| Handle: | http://hdl.handle.net/11391/931611 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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