ICHEP 2022

Experimental signals for a heavy scalar resonance in the ATLAS 4-lepton data

8 Jul 2022, 17:45

15m

Room 10 (Magenta B)

Parallel Talk Beyond the Standard Model Beyond the Standard Model

Speaker

Maurizio Consoli (Istituto Nazionale di Fisica Nucleare)

Description

We have analyzed the ATLAS sample of 4-lepton
events, in the region of invariant mass 620$÷$740 GeV. We argue
that, from these data, one can obtain a clear signal for the
existence of a new scalar resonance. Looking for its possible
interpretation, we have compared with the hypothetical second
resonance of the Higgs field that has been recently proposed
and which would couple to longitudinal W's with the same typical
strength of the low-mass state at $125$ GeV. In fact, on the one hand,
the observed mass $(M_H{)}^{\mathrm{e}\mathrm{x}\mathrm{p}}=660÷680$ GeV would fit well with the
theoretical range $(M_H{)}^{\mathrm{t}\mathrm{h}\mathrm{e}\mathrm{o}\mathrm{r}}=690\pm 10(\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t})\pm 20(\mathrm{s}\mathrm{y}\mathrm{s})\mathrm{G}\mathrm{e}\mathrm{V}$.
On the other hand, the ATLAS data reproduce to high accuracy
the expected correlation between resonating peak cross section
${\sigma }_R(pp\to H\to 4l)$ and the ratio ${\gamma }_H={\mathrm{\Gamma }}_H/M_H$
which should mainly be determined by the lower mass $m_h=$ 125 GeV.
This supports the idea that $m_h$ and the new $(M_H{)}^{\mathrm{e}\mathrm{x}\mathrm{p}}$
could really represent two different excitations of the same Higgs field.
The analogous, CMS available results will also be discussed.

Presentation materials

Consoli_Fabbri_ICHEP_FINALISSIMA.pdf