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Measurement of decay parameters for Xi- --> Lambda pi- decay
A Chakravorty1, H T Diehl, J Duryea
1Physics Division, Illinois Institute of Technology, Chicago, Illinois 60616, USA.
Physical Review Letters
|August 9, 2003
Abstract:
Based on 1.35 x 10(6) polarized Xi(-) events, we measure the parameter phi(Xi) to be -1.61 degrees +/-2.66 degrees +/-0.37 degrees for the Xi(-)-->Lambda pi(-) decay. New results for the parameters beta(Xi) and gamma(Xi) are also presented. Assuming that the CP-violating phase difference is negligible, we deduce the strong phase difference between the P-wave and S-wave amplitudes of the Lambda pi final state to be 3.17 degrees +/-5.28 degrees +/-0.73 degrees, reducing the uncertainty in estimating the level of CP violation in Xi-hyperon decay.