Delta ACP within the Standard Model and beyond

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

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
• Electronic ISSN: 1029-8479
• 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
• Public URL: https://durham-repository.worktribe.com/output/1325702