19–21 mai 2025
IPHC
Fuseau horaire Europe/Paris

Impact of Background Processes in the $H \to Z \gamma$ Decay

21 mai 2025, 11:50
20m
Amphi Grünewald (IPHC)

Amphi Grünewald

IPHC

Institut Pluridisciplinaire Hubert Curien 23 rue du Loess 67200 Strasbourg

Orateur

Aliaksei Kachanovich (Université libre de Bruxelles)

Description

In the study of the rare $H \to Z \gamma$ process, both ATLAS and CMS collaborations reported an excess with $\mu = 2.2 \pm 0.7$ in the number of events. Initially, this was interpreted as a modification of the $HZ\gamma$ vertex. However, the $H \to Z \gamma$ process is reconstructed from the $H \to \ell \ell \gamma$ final state, and background contributions were previously neglected. In this work, we carefully analyze the background contributions to the $H \to Z \gamma$ process and propose an explanation for the excess as a new BSM physics background. We suggest an effective field theory approach, as well as a UV-complete model, both of which generate the required background to resolve this discrepancy.

Author

Aliaksei Kachanovich (Université libre de Bruxelles)

Documents de présentation