Comparison of $H\to \ell \bar{\ell }{\hat{I}}^3$ and $H\to {\hat{I}}^{3}Z,Z\to \ell \bar{\ell }$ including the ATLAS cuts

Abstract

A precise comparison is made between the Dalitz decay $H\to \ell \bar{\ell }{\hat{I}}^3$ and the two body decay $H\to {\hat{I}}^{3}Z,Z\to \ell \bar{\ell }$ for electrons and for muons including experimental cuts appropriate for the ATLAS detector. The widths for these two processes differ by 8% for electrons and 3% for muons. Given that there remain QCD radiative corrections of this order that are not included, this suggests that the isolation of the Dalitz decay will be challenging.

4 pages, 3 figures, 2 tables