Charmed penguin versus BAU

TL;DR

This paper proposes a fourth quark-lepton generation as an explanation for large CP asymmetries in D-meson decays, also addressing baryon number preservation and effects on Big Bang nucleosynthesis.

Contribution

It introduces a novel fourth generation model to explain CP asymmetries and discusses its implications for baryon number conservation and early universe physics.

Findings

Fourth generation can account for observed CP asymmetries

Weakly mixed leptons help preserve baryon number

Potential impacts on Big Bang nucleosynthesis

Abstract

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.