LHCb collaboration measured CPV at the level of one percent in the difference of assymetries in D0(Dˉ0)→π+π−,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.
@article{arxiv.1111.6949,
title = {(\Delta A_{CP})_{LHCb} and the fourth generation},
author = {A. N. Rozanov and M. I. Vysotsky},
journal= {arXiv preprint arXiv:1111.6949},
year = {2012}
}
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