(\Delta A_{CP})_{LHCb} and the fourth generation

Abstract

LHCb collaboration measured CPV at the level of one percent in the difference of assymetries in $D^0({\bar{D}}^0)\to {\pi }^{+}{\pi }^{-},K^{+}{K}^{-}$ decays. If confirmed on a larger statistics and final systematics this would mean New Physics manifestation. The fourth quark-lepton generation can be responsible for the observed effect.

Comments: 4 pages, www address in ref. 8 is added, mechanism of CPV enhancement in case of 4 generation explained in more detail. Reference to recent CDF result is added. To be published in JETP Letters