Título:
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Measurement of Bs0 and Ds- meson lifetimes
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Autor/a:
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Badalov, Alexey; Calvo Gómez, Míriam; Camboni, Alessandro; Coquereau, Samuel; Fernandez, G.; Garrido Beltrán, Lluís; Gascón Fora, David; Graciani Díaz, Ricardo; Graugés Pous, Eugeni; Marin Benito, Carla; Picatoste Olloqui, Eduardo; Rives Molina, Vicente José; Sánchez Gonzalo, David; Vilasis-Cardona, Xavier; LHCb Collaboration
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Otros autores:
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Universitat de Barcelona |
Abstract:
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We report on a measurement of the flavor-specific Bs0 lifetime and of the Ds- lifetime using proton-proton collisions at center-of-mass energies of 7 and 8 TeV, collected by the LHCb experiment and corresponding to 3.0 fb-1 of integrated luminosity. Approximately 407 000 Bs0→Ds(*)-μ+νμ decays are partially reconstructed in the K+K-π-μ+ final state. The Bs0 and Ds- natural widths are determined using, as a reference, kinematically similar B0→D(*)-μ+νμ decays reconstructed in the same final state. The resulting differences between widths of Bs0 and B0 mesons and of Ds- and D- mesons are ΔΓ(B )=-0.0115 ±0.0053 (stat ) ±0.0041 (syst ) ps-1 and ΔΓ(D )=1.0131 ±0.0117 (stat ) ±0.0065 (syst ) ps-1, respectively. Combined with the known B0 and D- lifetimes, these yield the flavor-specific Bs0 lifetime, τBs 0 fs =1.547 ±0.013 (stat ) ±0.010 (syst ) ±0.004 (τB) ps and the Ds- lifetime, τDs-=0.5064 ±0.0030 (stat ) ±0.0017 (syst ) ±0.0017 (τD) ps . The last uncertainties originate from the limited knowledge of the B0 and D- lifetimes. The results improve upon current determinations. |
Materia(s):
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-Física de partícules -Experiments -Particle physics -Experiments |
Derechos:
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cc by (c) CERN; LHCb Collaboration, 2017
http://creativecommons.org/licenses/by/3.0/es/ |
Tipo de documento:
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Artículo Artículo - Versión publicada |
Editor:
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American Physical Society
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