Bridge between Hadrodynamics & HEP: Regional CP Violation in Beauty & Charm Decays

TL;DR

This paper discusses the challenges and recent experimental evidence of CP violation in beauty and charm hadron decays, emphasizing the importance of consistent parametrization, symmetry considerations, and collaboration between theorists and experimentalists.

Contribution

It highlights the need for a unified approach to CP asymmetries, clarifies the role of symmetries and penguin operators, and reports recent LHCb findings on regional CP asymmetries in baryon decays.

Findings

LHCb evidence of CP asymmetries in T-odd moments of mbda_b^0 decays

Importance of probing regional asymmetries with more data

Discussion on the role of symmetries and penguin operators in CP violation

Abstract

There is a long way from `accuracy' to `precision' about {\bf CP} asymmetries in the decays of beauty \& charm hadrons. (a) We have to apply consistent parametrization of the CKM matrix. (b) Probing many-body final states (FS) is {\em not} a back-up for understanding the underlying forces; to be realistic we can hardly go beyond four-body FS. (c) Broken U-spin symmetry is a good tools to describe spectroscopy of hadrons.However the landscape is very different for weak transitions; the connection of U- \& V-spin symmetries are important. We have to understand the differences between Penguin {\em operators} vs. Penguin {\em diagrams}. (d) Collaborations of experimenters \& theorists are crucial with {\em judgment}. There is a `hot' news from the conference ICHEP2016: LHCb data show evidence of {\bf CP} asymmetries in the {\bf T}-odd moment from $\Lambda_b^0 \to p \pi^-\pi^+\pi^-$. LHCb will follow this `road' with $\Lambda_b^0 \to p \pi^-K^+K^-$, $\Lambda_b^0 \to p K^- \pi^+\pi^-$ \& $\Lambda_b^0 \to p K^-K^+K^-$ in run-1. With much more data it is crucial to probe its features in {\em regional} asymmetries. \\ A quote from Marinus, who was a $\sim$ 468 AD student of Proklos, a well-known Neoplatonic philosopher: "Only {\em being} good is one thing -- but good {\em doing} it is the other one!"