Measurement of the Λ b 0 , Ξ b − , and Ω b − Baryon Masses
Name
PhysRevLett.110.182001.pdf
Description
Published version
Size
231.18 KB
Format
Adobe PDF
Checksum (MD5)
883db2c1b42ad992d8710b4643caa927
Author(s)
Williams, Michael
Date Issued
2013
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Aaij, R., et al. "Measurement of the Lambda(0)(B), Xi(-)(B), and Omega(-)(B) Baryon Masses." Physical Review Letters 110 18 (2013): 8.
Version
Final published version
Abstract
Bottom baryons decaying to a J/ψ meson and a hyperon are reconstructed using 1.0 fb-1 of data collected in 2011 with the LHCb detector. Significant Λb0→J/ψΛ, Ξb-→J/ψΞ- and Ωb-→J/ψΩ- signals are observed and the corresponding masses are measured to be M(Λb0)=5619.53±0.13(stat.) ±0.45(syst.) MeV/c2, M(Ξb-)=5795.8±0.9(stat.)±0.4(syst.) MeV/c2, M(Ωb-)=6046.0±2.2(stat.)±0.5(syst.) MeV/c2, while the differences with respect to the Λb0 mass are M(Ξb-)-M(Λb0)= 176.2±0.9(stat.)±0.1(syst.) MeV/c2, M(Ωb-)-M(Λb0)= 426.4±2.2(stat.)±0.4(syst.) MeV/c2. These are the most precise mass measurements of the Λb0, Ξb- and Ωb- baryons to date. Averaging the above Λb0 mass measurement with that published by LHCb using 35 pb-1 of data collected in 2010 yields M(Λb0)=5619. 44±0.13(stat.)±0.38(syst.) MeV/c2. © 2013 CERN. Published by the American Physical Society under the terms of the.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution 3.0
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DOI of Published Version
https://doi.org/10.1103/PHYSREVLETT.110.182001
