Background processes in Higgs decay to Z gamma

Abstract

The ATLAS and CMS Collaborations reported that the observed number of Higgs boson decays into a $Z$ boson and a photon is $\hat{I}¼=2.2\pm 0.7$ times higher than predicted by the Standard Model. Initially, this discrepancy was attributed to a modification of the $HZ{\hat{I}}^3$ vertex. In the $H\to Z{\hat{I}}^3$ process, this decay is reconstructed from $H\to \ell \ell {\hat{I}}^3$, where $\ell$ represents either an electron or a muon. In this study, an investigation is conducted to examine this anomaly by exploring potential additional background contributions to $H\to \ell \ell {\hat{I}}^3$ from various subprocesses within and beyond the Standard Model.

7 pages, 3 figures, 1 table