Charmed penguin versus BAU
  Since the Standard Model most probably cannot explain the large value of CP asymmetries recently observed in D-meson decays we propose the fourth quark-lepton generation explanation of it. As a byproduct weakly mixed leptons of the fourth generation make it possible to save the baryon number of the Universe from erasure by sphalerons. An impact of the 4th generation on BBN is briefly discussed. 
A. D. Dolgov, S. I. Godunov, A. N. Rozanov, M. I. Vysotsky
hep-ph astro-ph.CO