Delta ACP within the Standard Model and beyond

Chala, Mikael; Lenz, Alexander; Rusov, Aleksey V.; Scholtz, Jakub

doi:10.1007/jhep07(2019)161

Delta ACP within the Standard Model and beyond

Chala, Mikael; Lenz, Alexander; Rusov, Aleksey V.; Scholtz, Jakub

Authors

Mikael Chala

Alexander Lenz

Aleksey V. Rusov

Jakub Scholtz

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.

Citation

Chala, M., Lenz, A., Rusov, A. V., & Scholtz, J. (2019). Delta ACP within the Standard Model and beyond. Journal of High Energy Physics, 2019(7), Article 161. https://doi.org/10.1007/jhep07%282019%29161

Journal Article Type	Article
Acceptance Date	Jul 16, 2019
Online Publication Date	Jul 26, 2019
Publication Date	Jul 31, 2019
Deposit Date	Aug 8, 2019
Publicly Available Date	Aug 8, 2019
Journal	Journal of High Energy Physics
Print ISSN	1126-6708
Publisher	Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Peer Reviewed	Peer Reviewed
Volume	2019
Issue	7
Article Number	161
DOI	https://doi.org/10.1007/jhep07%282019%29161

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