Abstract
Using a proton-proton collision data sample corresponding to an integrated luminosity of collected by LHCb at center-of-mass energies of 7 and 8 TeV, about 3800 , signal decays are reconstructed. From this sample, the first measurement of the baryon lifetime is made, relative to that of the baryon. The mass differences and are also measured with precision more than 4 times better than the current world averages. The resulting values are where the first uncertainty is statistical and the second is systematic. The relative rate of to baryon production is measured to be where the first factor is the ratio of fragmentation fractions, relative to . Relative production rates as functions of transverse momentum and pseudorapidity are also presented.
- Received 28 May 2014
DOI:https://doi.org/10.1103/PhysRevLett.113.032001
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© 2014 CERN, for the LHCb Collaboration