Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/133085
Title: Precision Measurement of the Mass and Lifetime of the Ξ0b Baryon
Author: Badalov, Alexey
Calvo Gómez, Míriam
Camboni, Alessandro
Garrido Beltrán, Lluís
Gascón Fora, David
Graciani Díaz, Ricardo
Graugés Pous, Eugeni
Marin Benito, Carla
Picatoste Olloqui, Eduardo
Rives Molina, Vicente José
Ruiz, Hugo (Ruiz Pérez)
Vilasis-Cardona, Xavier
LHCb Collaboration
Keywords: Física de partícules
Experiments
Particle physics
Experiments
Issue Date: 15-Jul-2014
Publisher: American Physical Society
Abstract: Using a proton-proton collision data sample corresponding to an integrated luminosity of 3     fb − 1 collected by LHCb at center-of-mass energies of 7 and 8 TeV, about 3800 Ξ 0 b → Ξ + c π − , Ξ + c → p K − π + signal decays are reconstructed. From this sample, the first measurement of the Ξ 0 b baryon lifetime is made, relative to that of the Λ 0 b baryon. The mass differences M ( Ξ 0 b ) − M ( Λ 0 b ) and M ( Ξ + c ) − M ( Λ + c ) are also measured with precision more than 4 times better than the current world averages. The resulting values are τ Ξ 0 b τ Λ 0 b = 1.006 ± 0.018 ± 0.010 , M ( Ξ 0 b ) − M ( Λ 0 b ) = 172.44 ± 0.39 ± 0.17     MeV / c 2 , M ( Ξ + c ) − M ( Λ + c ) = 181.51 ± 0.14 ± 0.10     MeV / c 2 , where the first uncertainty is statistical and the second is systematic. The relative rate of Ξ 0 b to Λ 0 b baryon production is measured to be f Ξ 0 b f Λ 0 b B ( Ξ 0 b → Ξ + c π − ) B ( Λ 0 b → Λ + c π − ) B ( Ξ + c → p K − π + ) B ( Λ + c → p K − π + ) = ( 1.88 ± 0.04 ± 0.03 ) × 1 0 − 2 , where the first factor is the ratio of fragmentation fractions, b → Ξ 0 b relative to b → Λ 0 b . Relative production rates as functions of transverse momentum and pseudorapidity are also presented.
Note: Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.113.032001
It is part of: Physical Review Letters, 2014, vol. 113, num. 3, p. 032001
URI: http://hdl.handle.net/2445/133085
Related resource: https://doi.org/10.1103/PhysRevLett.113.032001
ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

Files in This Item:
File Description SizeFormat 
645755.pdf461.39 kBAdobe PDFView/Open


This item is licensed under a Creative Commons License Creative Commons