• Open Access

Precision Measurement of the Mass and Lifetime of the Ξb0 Baryon

R. Aaij et al. (LHCb Collaboration)
Phys. Rev. Lett. 113, 032001 – Published 15 July 2014

Abstract

Using a proton-proton collision data sample corresponding to an integrated luminosity of 3fb1 collected by LHCb at center-of-mass energies of 7 and 8 TeV, about 3800 Ξb0Ξc+π, Ξc+pKπ+ 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 fΞb0fΛb0B(Ξb0Ξc+π)B(Λb0Λc+π)B(Ξc+pKπ+)B(Λc+pKπ+)=(1.88±0.04±0.03)×102,where the first factor is the ratio of fragmentation fractions, bΞb0 relative to bΛb0. Relative production rates as functions of transverse momentum and pseudorapidity are also presented.

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  • Received 28 May 2014

DOI:https://doi.org/10.1103/PhysRevLett.113.032001

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2014 CERN, for the LHCb Collaboration

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Vol. 113, Iss. 3 — 18 July 2014

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