Search for CP Violation in Charged-Xi and Lambda Hyperon Decays

Abstract

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 $A_{\Xi \Lambda }=\frac{{\alpha }_{\Xi }{\alpha }_{\Lambda }-{\bar{\alpha }}_{\Xi }{\bar{\alpha }}_{\Lambda }}{{\alpha }_{\Xi }{\alpha }_{\Lambda }+{\bar{\alpha }}_{\Xi }{\bar{\alpha }}_{\Lambda }}=[0.0+/-5.1(stat)+/-4.4(syst)]\times 10^{-4}$.

4 pages, 4 figures, to be published in Phys. Rev. Lett

References in corpus (5)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• CP Violation in Hyperon Nonleptonic Decays within the Standard Model
• New Physics and CP Violation in Hyperon Nonleptonic Decays
• Measurement of Decay Parameters for ${\Xi }^{-}\to \Lambda {\pi }^{-}$ Decay
• CP Violation in Hyperon Decays from SUSY with Hermitian Yukawa and A Matrices

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• 70 Years of Hyperon Spectroscopy: A review of strange $\Xi$, $\Omega$ baryons, and the spectrum of charmed and bottom baryons
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• Constraining P and CP violation in the main decay of the neutral Sigma hyperon
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• A New Experiment to Study Hyperon CP Violation and the Charmonium System
• Precise Measurement of Matter-Antimatter Asymmetry with Entangled Hyperon Antihyperon Pairs
• Sensitivity of $CP$ Violation of $\Lambda$ decay in $J/\psi \to \Lambda \bar{\Lambda }$ at STCF
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