Phenomenology of Left-Right Models in the quark sector

TL;DR

This paper analyzes Left-Right Models extending the Standard Model, focusing on meson-mixing observables, calculating QCD effects at NLO, and performing a global fit including electroweak data, direct searches, and uncertainties modeling.

Contribution

It provides a detailed NLO calculation of QCD corrections in LR Models and a comprehensive global fit incorporating various experimental constraints and uncertainty modeling techniques.

Findings

NLO QCD corrections significantly impact meson-mixing predictions.

Global fit constrains LR Model parameters using multiple observables.

Comparison of frequentist schemes for theoretical uncertainties in flavor physics.

Abstract

A natural avenue to extend the Standard Model (SM) is to embed it into a more symmetric framework. Here, I focus in Left-Right (LR) Models, which treat left- and right-handed chiralities on equal footing. Important information about the structure of LR Models comes from meson-mixing observables. Due to the impact of the new contributions to these processes, I consider the calculation of the short-distance QCD effects correcting the LR Model contributions to meson-mixing observables at the Next-to-Leading Order. I then revisit the phenomenology of a simple realization of LR Models, containing doublet scalars, and combine in a global fit electroweak precision observables, direct searches of the new gauge bosons and meson oscillation observables, a task performed within the CKMfitter statistical framework. Finally, I also cover a different issue, namely the modeling of theoretical uncertainties, a class of uncertainties specially important for flavour physics. Different frequentist schemes are compared, and their differences are illustrated with flavour-oriented examples.