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

TL;DR

The paper discusses the LHCb measurement of CP violation differences in D meson decays and explores how a hypothetical fourth quark-lepton generation could explain these observations as potential evidence of New Physics.

Contribution

It proposes that the existence of a fourth quark-lepton generation could account for the observed CP violation differences in D meson decays.

Findings

LHCb observed approximately 1% CP violation difference in D meson decays.

A fourth generation could potentially explain the observed CP violation.

Further data is needed to confirm these findings as evidence of New Physics.

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.