Measurement of the Spin of the Omega- Hyperon at BABAR
Abstract
A measurement of the spin of the Omega- hyperon produced through the exclusive process Xic0 --> 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 Xic0 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 Omegac0 --> Omega- pi+ from a 230 fb-1 sample are also found to be consistent with Omega- spin 3/2. If the Xic0 spin were 3/2, an Omega- spin of 5/2 cannot be excluded.
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