https://doi.org/10.1140/epjc/s10052-020-7952-4
Regular Article – Theoretical Physics
Multiphoton signals of a (96 GeV?) stealth boson
1
Instituto de Física Teórica UAM-CSIC, Campus de Cantoblanco, 28049, Madrid, Spain
2
Departamento de Física and CFTP, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001, Lisbon, Portugal
* e-mail: jaas@ugr.es
Received:
25
February
2020
Accepted:
20
April
2020
Published online:
12
May
2020
Cascade decays of new scalars into final states with multiple photons and possibly quarks may lead to distinctive experimental signatures at high-energy colliders. Such signals are even more striking if the scalars are highly boosted, as when produced from the decay of a much heavier resonance. We study this type of events within the framework of the minimal stealth boson model, an anomaly-free 
extension of the Standard Model with two complex scalar singlets. It is shown that, while those signals may have cross sections that might render them observable with LHC Run 2 data, they have little experimental coverage. We also establish a connection with a CMS excess observed in searches for new scalars decaying into diphoton final states near 96 GeV. In particular, we conclude that the predicted multiphoton signatures are compatible with such excess.
© The Author(s), 2020
