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Precision measurement of the mass and lifetime of the Ξb0 baryon
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LHCb Collaboration (Including: Back, J. J., Blake, Thomas, Craik, Daniel, Dossett, D., Gershon, T. J., Kreps, Michal, Latham, Thomas, O'Hanlon, D. P., Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Wallace, Charlotte and Whitehead, M. (Mark)). (2014) Precision measurement of the mass and lifetime of the Ξb0 baryon. Physical Review Letters, Volume 113 (Number 3). Article number 032001. doi:10.1103/PhysRevLett.113.032001 ISSN 0031-9007.
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Official URL: http://dx.doi.org/10.1103/PhysRevLett.113.032001
Abstract
Using a proton-proton collision data sample corresponding to an integrated luminosity of 3fb-1 collected by LHCb at center-of-mass energies of 7 and 8 TeV, about 3800 Ξb0→Ξc+π-, Ξc+→pK-π+ signal decays are reconstructed. From this sample, the first measurement of the Ξb0 baryon lifetime is made, relative to that of the Λb0 baryon. The mass differences M(Ξb0)-M(Λb0) and M(Ξc+)-M(Λc+) are also measured with precision more than 4 times better than the current world averages. The resulting values are τΞb0τΛb0=1.006±0. 018±0.010,M(Ξb0)-M(Λb0)=172.44±0.39±0.17MeV/c2, M(Ξc+)-M(Λc+)=181.51±0.14±0.10MeV/c2,where the first uncertainty is statistical and the second is systematic. The relative rate of Ξb0 to Λb0 baryon production is measured to be fΞb0fΛ b0B(Ξb0→Ξc+π-)B(Λb0→Λc+π-) B(Ξc+→pK-π+)B(Λc+→pK-π+)=(1.88±0.04±0. 03)×10-2,where the first factor is the ratio of fragmentation fractions, b→Ξb0 relative to b→Λb0. Relative production rates as functions of transverse momentum and pseudorapidity are also presented.
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