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Title: | Measurement of the absolute branching fractions for D−s→ℓ−¯νℓ and extraction of the decay constant fDs |
Author: | Garra Ticó, Jordi Graugés Pous, Eugeni BABAR Collaboration |
Keywords: | Física de partícules Experiments Particle physics Experiments |
Issue Date: | 10-Nov-2010 |
Publisher: | American Physical Society |
Abstract: | 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. |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.82.091103 |
It is part of: | Physical Review D, 2010, vol. 82, num. 9, p. 091103 |
URI: | http://hdl.handle.net/2445/131740 |
Related resource: | https://doi.org/10.1103/PhysRevD.82.091103 |
ISSN: | 1550-7998 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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