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Observation and mass measurement of the baryon Ξb-

Abstract:
We report the observation and measurement of the mass of the bottom, strange baryon Ξb- through the decay chain Ξb-→J/ψΞ-, where J/ψ→μ+μ-, Ξ-→Λπ-, and Λ→pπ-. A signal is observed whose probability of arising from a background fluctuation is 6.6×10-15, or 7.7 Gaussian standard deviations. The Ξb- mass is measured to be 5792.9±2.5(stat) ±1.7(syst)MeV/c2. © 2007 The American Physical Society.

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Journal:
Physical Review Letters
Volume:
99
Issue:
5
Publication date:
2007-08-03
DOI:
EISSN:
1079-7114
ISSN:
0031-9007
URN:
uuid:8608e999-e4bd-44fe-b880-cefa7fc416b6
Source identifiers:
117283
Local pid:
pubs:117283
Language:
English

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