Authors

Abstract

We report the observation and measurement of the mass of the bottom, strange baryon Xi(-)(b) through the decay chain Xi(-)(b)-->J/psi Xi(-), where J/psi-->mu(+)mu(-), Xi(-)-->Lambda pi(-), and Lambda-->p pi(-). A signal is observed whose probability of arising from a background fluctuation is 6.6 x 10(-15), or 7.7 Gaussian standard deviations. The Xi(-)(b) mass is measured to be 5792.9 +/- 2.5(stat) +/- 1.7(syst) MeV/c(2).

Published in:

Physical Review Letters 99,5 (2007) 052002 1-7;

Keywords

Physics, Multidisciplinary

Date of Version

January 2007

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