CP violation and CKM studies (and first LHCb Run II results)

TL;DR

The paper reviews recent results from the LHCb experiment on CP violation, rare decays, and cross-section measurements at 13 TeV, highlighting new constraints on physics beyond the Standard Model and initial Run II findings.

Contribution

It presents the first LHCb Run II results, including measurements of CP violation, rare decays, and charm cross-sections at 13 TeV, demonstrating the experiment's capabilities and new physics constraints.

Findings

Constraints on models beyond the Standard Model.

Discrepancies with Standard Model predictions in some decay modes.

First measurements from LHCb Run II at 13 TeV.

Abstract

The LHC is the new b-hadron factory and will be dominating flavour physics until the start of Belle II, and beyond in many decay modes. While the $B$ factories and Tevatron experiments are still analysing their data, ATLAS, CMS and LHCb are producing interesting new results in CP violation and rare decays, that set strong constraints on models beyond that SM and exhibit some discrepancies with the SM predictions. The LHCb collaboration used the LHC 50 ns ramp-up period of July 2015 to measure the double-differential $J/\psi$, $J/\psi$-from-$b$-hadron and charm cross-sections at $\sqrt{s} = 13$ TeV. Both measurements were performed directly on triggered candidates using a reduced data format that does not require offline processing.