"I Know She Invented Fire, but What Has She Done Recently?" or "I Have Come to Praise Ch., not Bury Her!" or `On the Second Renaissance of Charm Physics'

TL;DR

Charm meson oscillations, strongly evidenced by B factories, offer a promising avenue to detect New Physics through CP violation, with theoretical interpretations remaining ambiguous but potentially revealing beyond Standard Model effects.

Contribution

This paper highlights the potential of charm oscillations as a new probe for New Physics and discusses CP violation phenomenology in charm decays.

Findings

Strong evidence for D0 oscillations from B factories

Oscillations may be fully explained by SM or include New Physics contributions

Charm's unique role among up-type quarks enhances its importance in flavor physics

Abstract

$D^0$ oscillations, for which the $B$ factories have found strong evidence, provide a new stage for our search for New Physics in heavy flavour dynamics. While the theoretical verdict on the observed values of $x_D$ and $y_D$ is ambiguous -- they could be fully generated by SM dynamics, yet could contain also a sizable contribution from New Physics -- such oscillations can enhance the observability of \cp violation driven by New Physics. After emphasizing the unique role of charm among up-type quarks, I sketch the \cp phenomenology for partial widths and final state distributions.