| Article | |
| Report number | arXiv:2109.02650 ; ICPP-057 ; PSI-PR-21-21 ; ZU-TH 38/21 ; CERN-TH-2021-129 ; LTH 1267 |
| Title | Accumulating evidence for the associated production of a new Higgs boson at the LHC |
| Related title | Accumulating Evidence for the Associate Production of a Neutral Scalar with Mass around 151 GeV |
| Author(s) | Crivellin, Andreas (Zurich U. ; PSI, Villigen ; CERN) ; Fang, Yaquan (Beijing, Inst. High Energy Phys. ; Beijing, GUCAS) ; Fischer, Oliver (Liverpool U.) ; Bhattacharya, Srimoy (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Kumar, Mukesh (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Malwa, Elias (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Mellado, Bruce (U. Witwatersrand, Johannesburg, Sch. Phys. ; iThemba LABS) ; Rapheeha, Ntsoko (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Ruan, Xifeng (U. Witwatersrand, Johannesburg, Sch. Phys.) ; Sha, Qiyu (Beijing, Inst. High Energy Phys. ; Beijing, GUCAS) |
| Publication | 2023-12-01 |
| Imprint | 2021-09-06 |
| Number of pages | 9 |
| Note | 9 pages, 5 figures, 1 table, version accepted for publication in PRD |
| In: | Phys. Rev. D 108 (2023) 115031 |
| DOI | 10.1103/PhysRevD.108.115031 (publication) |
| Subject category | hep-th ; Particle Physics - Theory ; hep-ex ; Particle Physics - Experiment ; hep-ph ; Particle Physics - Phenomenology |
| Abstract | In the last decades, the Standard Model (SM) of particle physics has been extensively tested and confirmed, with the announced discovery of the Higgs boson in 2012 being the last missing puzzle piece. Even though since then the search for new particles and interactions has been further intensified, the experiments ATLAS and CMS at the Large Hadron Collider (LHC) at CERN did not find evidence for the direct production of a new state. However, in recent years deviations between LHC data and SM predictions in multiple observables involving two or more leptons (electrons or muons) have emerged, the so-called ``multi-lepton anomalies'', pointing towards the existence of a beyond the SM Higgs boson $S$. While from these measurements its mass cannot be exactly determined, it is estimated to lay in the range between $130\,$GeV and $160\,$GeV. Motivated by this observation, we perform a search for signatures of $S$, by using existing CMS and ATLAS analyses. Combining channels involving the associate productions of SM gauge bosons ($\gamma\gamma$ and $Z\gamma$), we find that a simplified model with a new scalar with $m_S= 151.5\,$GeV is preferred over the SM hypothesis by 4.3$\sigma$ (3.9$\sigma$) locally (globally). On the face of it, this provides a good indication for the existence of a new scalar resonance $S$ decaying into photons, in association with missing energy and allows for a connection to the long-standing problem of Dark Matter. Furthermore, because $S$ is always produced together with other particles, we postulate the existence of a second new (heavier) Higgs boson $H$ that decays into $S$ and propose novel searches to discover this particle, which can be performed by ATLAS and CMS. |
| Copyright/License | publication: © 2023-2024 authors (License: CC BY 4.0), sponsored by SCOAP³ preprint: (License: CC BY 4.0) |
Corresponding record in: Inspire
Record created 2021-09-09, last modified 2024-01-10
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