Mixing and CP Violation in the Charm System

In recent years charm physics has undergone a renaissance, which has been catalyzed by an unexpected and impressive set of experimental results from the B factories, the Tevatron, and LHCb. The existence of [Formula: see text] oscillations is now well established, and the recent discovery of CP violation in D0 decays has further renewed interest in the charm sector. In this article, we review the current status of charm-mixing and CP-violation measurements and assess their agreement with theoretical predictions within the Standard Model and beyond. We look forward to the great improvements in experimental precision that can be expected over the coming two decades and to the prospects for corresponding advances in theoretical understanding. Expected final online publication date for the Annual Review of Nuclear and Particle Science, Volume 71 is September 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

Charm physics confronts high-pT lepton tails

We present a systematic survey of possible short-distance new-physics effects in (semi)leptonic charged- and neutral-current charmed meson decays. Using the Standard Model Effective Field Theory (SMEFT) to analyze the most relevant experimental data at low and high energies, we demonstrate a striking complementarity between charm decays and high invariant mass lepton tails at the LHC. Interestingly enough, high-pT Drell-Yan data offer competitive constraints on most new physics scenarios. Furthermore, the full set of correlated constraints from K, π and τ decays imposed by SU(2)L gauge invariance is considered. The bounds from D(s) decays, high-pT lepton tails and SU(2)L relations chart the space of the SMEFT affecting semi(leptonic) charm flavor transitions.

Measurements with doubly-charmed hadrons in LHCb

The LHCb experiment has been collecting large amounts of charm data, making it possible to perform precise measurements and search for rare particles. In 2017, the LHCb collaboration reported the first observation of the doubly charmed baryon, the $ \Xi _{cc}^{ + + } $. In 2018, the first measurement of the $ \Xi _{cc}^{ + + } $ lifetime, using the same decay and dataset, was published. This paper summarizes the content of both analyses, as reported in the 9th International Workshop on Charm Physics, in Novosibirsk, Russia.

Charm physics at ATLAS

This proceeding contribution presents the recent highlights of charm physics programme of the ATLAS experiment at the Large Hadron Collider. These include measurements of charmonia production both in pp and nuclear collisions, charmonium pair production, studies of exotic states and Bc mesons. Most of the shown results are obtained with the data collected during the LHC Run-1.