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Title: Precision measurement of the Λc+, Ξc+, and Ξc0 baryon lifetimes
Author: LHCb Collaboration
Alfonso Albero, Alejandro
Calvo Gómez, Míriam
Camboni, Alessandro
Coquereau, Samuel
Garrido Beltrán, Lluís
Gascón Fora, David
Gironella Gironell, Pere
Graciani Díaz, Ricardo
Graugés Pous, Eugeni
Vilasis-Cardona, Xavier
Marin Benito, Carla
Keywords: Barions
Col·lisions (Astrofísica)
Collisions (Astrophysics)
Issue Date: 1-Aug-2019
Publisher: American Physical Society
Abstract: We report measurements of the lifetimes of the Λþc , Ξþc and Ξ0 c charm baryons using proton-proton collision data at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment. The charm baryons are reconstructed through the decays Λþc → pK−πþ, Ξþc → pK−πþ and Ξ0c → pK−K−πþ, and originate from semimuonic decays of beauty baryons. The lifetimes are measured relative to that of the Dþ meson, and are determinedto be τΛþc ¼ fs; τΞþc ¼ 456. fs; τΞ0 c ¼ fs; where the uncertainties are statistical, systematic, and due to the uncertainty in the Dþ lifetime. The measurements are approximately 3-4 times more precise than the current world average values. The Λþc and Ξþ c lifetimes are in agreement with previous measurements; however, the Ξ0 c baryon lifetime is approximately 3.3 standard deviations larger than the world average value.
Note: Reproducció del document publicat a:
It is part of: Physical Review D, 2019, num. 100, p. 032001
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ISSN: 1550-7998
Appears in Collections:Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))
Articles publicats en revistes (Física Quàntica i Astrofísica)

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