Measurement of the Spin of the Omega^- Hyperon at BABAR

Details Measurement of the Spin of the Omega^- Hyperon at BABAR Measurement of the Spin of the Omega^- Hyperon at BABAR

2006-06-16

arxiv.org/abs/hep-ex/0606039v1

Phys.Rev.Lett.97:112001,2006

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 6 postscript figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.97.112001

A measurement of the spin of the Omega^- hyperon produced through the exclusive process Xi_c^0 --> Omega^- K^+ is presented using a total integrated luminosity of 116 fb^-1 recorded with the BABAR detector at the e^+ e^- asymmetric-energy B-Factory at SLAC. Under the assumption that the Xi_c^0 has spin 1/2, the angular distribution of the Lambda from Omega^- --> Lambda K^- decay is inconsistent with all half-integer Omega^- spin values other than 3/2. Lower statistics data for the process Omega_c^0 --> Omega^- pi^+ from a 230 fb^-1 sample are also found to be consistent with Omega^- spin 3/2. If the Xi_c^0 spin were 3/2, an Omega^- spin of 5/2 cannot be excluded.

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