Cookies

We use cookies to ensure that we give you the best experience on our website. You can change your cookie settings at any time. Otherwise, we'll assume you're OK to continue.

Durham University

Centre for Particle Theory

Research Staff

Publication details for Mikael Chala

Chala, Mikael, Lenz, Alexander, Rusov, Aleksey V. & Scholtz, Jakub (2019). Delta ACP within the Standard Model and beyond. Journal of High Energy Physics 2019(7): 161.

Author(s) from Durham

Abstract

In light of the recent LHCb observation of CP violation in the charm sector, we
review standard model (SM) predictions in the charm sector and in particular for ∆ACP.
We get as an upper bound in the SM |∆ASM
CP| ≤ 3.6 × 10−4
, which can be compared to
the measurement of ∆ALHCb2019
CP = (−15.4 ± 2.9) × 10−4
. We discuss resolving this tension
within an extension of the SM that includes a flavour violating Z
0
that couples only to ¯ss
and ¯cu. We show that for masses below 80 GeV and flavour violating coupling of the order
of 10−4
, this model can successfully resolve the tension and avoid constraints from dijet
searches, D0 − D
0 mixing and measurements of the Z width.