Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2004-12-13
Phys.Rev.Lett.93:262001,2004
Physics
High Energy Physics
High Energy Physics - Experiment
4 pages, 4 figures, to be published in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.93.262001
We have compared the proton and antiproton angular distributions in 117 million Xi-minus -> Lambda + pi-minus -> proton + pi-minus + pi-minus and 41 million anti-Xi-minus -> anti-Lamba + pi-plus -> antiproton + pi-plus + pi-plus decays using a subset of the data from the HyperCP experiment (E871) at Fermilab. We find no evidence of CP violation, with the direct-CP-violating parameter $A_{\Xi\Lambda} = \frac{\alpha_{\Xi}\alpha_{\Lambda} - \bar{\alpha}_{\Xi}\bar{\alpha}_{\Lambda}}{\alpha_{\Xi}\alpha_{\Lambda} + \bar{\alpha}_{\Xi}\bar{\alpha}_{\Lambda}} = [0.0+/-5.1(stat)+/-4.4(syst)]{\times}10^{-4}$.
Burnstein Ray A.
Chakravorty Alak
Chan Anthony A.
Chen Ya-Chen
Choong W.-S.
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