The absolute branching fractions for the decays Ds-→ℓ -ν̄ℓ (ℓ=e, μ, or τ) are measured using a data sample corresponding to an integrated luminosity of 521fb -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 fD s=(258.6±6.4±7.5)MeV, where the first uncertainty is statistical and the second is systematic.

Sanchez, P., Lees, J., Poireau, V., Prencipe, E., Tisserand, V., Tico, J., et al. (2010). Measurement of the absolute branching fractions for Ds-→ℓ -ν̄ℓ and extraction of the decay constant fDs. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 82(9) [10.1103/PhysRevD.82.091103].

Measurement of the absolute branching fractions for Ds-→ℓ -ν̄ℓ and extraction of the decay constant fDs

CARPINELLI, Massimo;
2010

Abstract

The absolute branching fractions for the decays Ds-→ℓ -ν̄ℓ (ℓ=e, μ, or τ) are measured using a data sample corresponding to an integrated luminosity of 521fb -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 fD s=(258.6±6.4±7.5)MeV, where the first uncertainty is statistical and the second is systematic.
Articolo in rivista - Articolo scientifico
Scientifica
BABAR detector
English
P. del Amo Sanchez et al. (BABAR Collaboration)
Sanchez, P., Lees, J., Poireau, V., Prencipe, E., Tisserand, V., Tico, J., et al. (2010). Measurement of the absolute branching fractions for Ds-→ℓ -ν̄ℓ and extraction of the decay constant fDs. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 82(9) [10.1103/PhysRevD.82.091103].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/389362
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