| Issue |
EPL
Volume 152, Number 1, October 2025
|
|
|---|---|---|
| Article Number | 14002 | |
| Number of page(s) | 7 | |
| Section | Nuclear and plasma physics, particles and fields | |
| DOI | https://doi.org/10.1209/0295-5075/ae082b | |
| Published online | 13 October 2025 | |
The 690 GeV scalar resonance
1 Istituto Nazionale di Fisica Nucleare, Sezione di Catania - Catania, Italy
2 Istituto Nazionale di Fisica Nucleare, Sezione di Bari - Bari, Italy
3 Istituto Nazionale di Fisica Nucleare, Sezione di Bologna - Bologna, Italy
4 CFTP, Instituto Superior Técnico, Universidade de Lisboa - Lisboa, Portugal
Received: 8 April 2025
Accepted: 17 September 2025
Abstract
Spontaneous symmetry breaking through the Higgs field has been experimentally confirmed as a basic ingredient of the Standard Model. However, the origin of the phenomenon may not be entirely clear, because, in perturbation theory, the vacuum turns out to be a metastable state. An alternative scenario was proposed that implies a second resonance of the Higgs field with a well-delimited mass 
GeV. This stabilises the potential, but, owing to an H coupling to longitudinal W's with the same typical strength as that of the low-mass state with 
GeV, it would still represent a relatively narrow resonance. Our scope here is twofold. First, leaving out many details, we outline a simple logical path where the, apparently surprising, idea of such a second resonance easily follows from basic properties of 
theories. Secondly, we spell out a definite experimental signature that characterises this resonance and is clearly visible in various LHC data.
© 2025 The author(s)
Published by the EPLA under the terms of the Creative Commons Attribution 4.0 International License (CC-BY). Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.