Gluon dipole penguin contributions to epsilon-prime / epsilon and CP violation in hyperon decays in the Standard Model

Jan, 1994
11 pages
Published in:
  • Phys.Lett.B 326 (1994) 307-311
e-Print:
Report number:
  • OITS-533,
  • UH-511-779-94

Citations per year

19942002201020182024012345
Abstract: (CERN)
We consider the gluon dipole penguin operator contributions to ϵ/ϵ\epsilon'/\epsilon and CP violation in hyperon decays. It has been proposed by Bertolini et al. that the contribution to ϵ/ϵ\epsilon'/\epsilon may be significant. We show that there is a cancellation in the leading order contribution and this contribution is actually suppressed by a factor of order O(mπ 2,mK 2)/Λ 2m_\pi~2, m_K~2)/\Lambda~2. We find that the same operator also contributes to CP violation in hyperon decays where it is not suppressed. The gluon dipole penguin operator can enhance CP violation in hyperon decays by as much as 25\%.)
  • hyperon: nonleptonic decay
  • nonleptonic decay: hyperon
  • K: nonleptonic decay
  • nonleptonic decay: K
  • Salam-Weinberg model
  • CP: violation
  • Feynman graph: higher-order
  • gluon
  • mass: top
  • top: mass