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Open Access Publications from the University of California

Examining CP symmetry in strange baryon decay

  • Author(s): Luk, Kam-Biu
  • Fermilab E756 Collaboration
  • HyperCP Collaboration
  • Burnstein, R.A.
  • Chakravorty, A.
  • Chan, A.
  • Chen, Y.C.
  • Choong, W.S.
  • Clark, K.
  • Diehl, T.
  • Dukes, E.C.
  • Durandet, C.
  • Duryea, J.
  • Felix, J.
  • Gidal, G.
  • Guglielmo, G.
  • Gustafson, H.R.
  • Heller, K.
  • Ho, C.
  • Ho, P.M.
  • Holmstrom, T.
  • Huang, M.
  • James, C.
  • Jenkins, M.
  • Johns, K.
  • Jones, T.
  • Kaplan, D.M.
  • Lederman, L.M.
  • Leros, N.
  • Lopez, F.
  • Longo, M.J.
  • Lu, L.
  • Luebke, W.
  • Nelson, K.
  • Park, H.K.
  • Perroud, J.P.
  • Rajaram, D.
  • Rameika, R.
  • Rubin, H.A.
  • Teige, S.
  • Teng, P.K.
  • Thomson, G.
  • Volks, J.
  • White, C.G.
  • White, S.L.
  • Zyla, P.
  • et al.

Non-conservation of CP symmetry can manifest itself in non-lepton ichyperon decays as a difference in the decay parameter between the strange-baryon decay and its charge conjugate. By comparing the decay distribution in the $\Lambda$ helicity frame for the decay sequence $\Xi- \to \Lambda \pi-$,$\Lambda \to p \pi-$with that of $\overline Xi+$ decay, E756 at Fermilab did not observe any CP-odd effect at the $10-2$ level. The status of a follow-up experiment, HyperCP (FNAL E871), to search for CP violation in charged $\Xi-\Lambda$ decay with a sensitivity of $10-4$is also presented.

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