Skip to main content
eScholarship
Open Access Publications from the University of California

Search for CP violation in hyperon decays.

  • Author(s): Zyla, Piotr;
  • Chan, A.;
  • Chen, Y.C.;
  • Ho, C.;
  • Teng, P.K.;
  • Choong, W.S.;
  • Gidal, G.;
  • Fu, Y.;
  • Gu, P.;
  • Jones, T.D.;
  • Luk, K.B.;
  • Turko, B.;
  • James, C.;
  • Volk, J.;
  • Felix, J.;
  • Burnstein, R.A.;
  • Chakrovorty, A.;
  • Kaplan, D.M.;
  • Lederman, L.M.;
  • Luebke, W.;
  • Rajaram, D.;
  • Rubin, H.A.;
  • Solomey, N.;
  • Torun, Y.;
  • White, C.G.;
  • White, S.L.;
  • Leros, N.;
  • Perroud, J.P.;
  • Gustafson, H.R.;
  • Longo, M.J.;
  • Lopez, F.;
  • Park, H.K.;
  • Clark, K.;
  • Jenkins, M.;
  • Dukes, E.C.;
  • Durandet, C.;
  • Holmstrom, T.;
  • Huang, M.;
  • Lu, L.;
  • Nelson, K.S.
  • et al.
Abstract

Direct CP violation in nonleptonic hyperon decays can be established by comparing the decays of hyperons and anti-hyperons. For Xi decay to Lambda pi followed by Lambda to p pi, the proton distribution in the rest frame of Lambda is governed by the product of the decay parameters alXi alLam. The asymmetry A_Xi Lambda, proportional to the difference of alXi alLam of the hyperon and anti-hyperon decays, vanishes if CP is conserved. We report on an analysis of a fraction of 1997 and 1999 data collected by the Hyper CP (E871) collaboration during the fixed-target runs at Fermilab. The preliminary measurement of the asymmetry is AXiLam = [ -7 pm 12(rm stat) pm 6.2(rm sys) ] times 10-4, an order of magnitude better than the present limit.

Main Content
For improved accessibility of PDF content, download the file to your device.
Current View