Explaining the γγ + X excesses at ≈151.5 GeV via the Drell-Yan production of a Higgs triplet
The multi-lepton anomalies suggest the existence of a new scalar with a mass between 145 GeV and 155 GeV, which is compatible with indications of the associated production of a narrow resonance with a mass of ≈151 GeV. These anomalies require a sizable branching fraction of the new scalar to WW. How...
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Elsevier
2025-03-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269325000589 |
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| author | Saiyad Ashanujjaman Sumit Banik Guglielmo Coloretti Andreas Crivellin Siddharth P. Maharathy Bruce Mellado |
| author_facet | Saiyad Ashanujjaman Sumit Banik Guglielmo Coloretti Andreas Crivellin Siddharth P. Maharathy Bruce Mellado |
| author_sort | Saiyad Ashanujjaman |
| collection | DOAJ |
| description | The multi-lepton anomalies suggest the existence of a new scalar with a mass between 145 GeV and 155 GeV, which is compatible with indications of the associated production of a narrow resonance with a mass of ≈151 GeV. These anomalies require a sizable branching fraction of the new scalar to WW. However, because no ZZ signal at this mass has been observed, this implies that the new boson could be the neutral component of an SU(2)L triplet with zero hypercharge. This field leads to a positive definite shift in the W mass and is produced via the Drell-Yan process pp→W⁎→Δ0Δ±. We use the side-bands of the ATLAS analysis [1] of the associated production of the Standard Model Higgs in the di-photon channel to search for this production mode of the triplet. Since the dominant decays of Δ± depend only on its mass, the effect in the 22 signal categories considered by ATLAS is completely correlated. Combining all channels in a likelihood ratio test, we find that a non-zero Br[Δ0→γγ], with a best-fit value of 0.66%, is preferred by ≈3σ for a mass of ≈151.5 GeV. While this mass is consistent with the multi-lepton anomalies, there is also an excess at ≈127 GeV with a significance of 3.6σ. However, the latter is inconsistent with the mass predicted by the multi-lepton anomalies and is in close proximity to the SM Higgs mass, suggesting the possibility of enhanced associated production of the SM Higgs. |
| format | Article |
| id | doaj-art-dbb85ca61bfa4830adc243f5c573c5e6 |
| institution | Kabale University |
| issn | 0370-2693 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
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| series | Physics Letters B |
| spelling | doaj-art-dbb85ca61bfa4830adc243f5c573c5e62025-02-08T04:59:28ZengElsevierPhysics Letters B0370-26932025-03-01862139298Explaining the γγ + X excesses at ≈151.5 GeV via the Drell-Yan production of a Higgs tripletSaiyad Ashanujjaman0Sumit Banik1Guglielmo Coloretti2Andreas Crivellin3Siddharth P. Maharathy4Bruce Mellado5Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China; Kaiping Neutrino Research Center, Jiangmen 529399, China; Corresponding author.Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH–8057 Zürich, Switzerland; Paul Scherrer Institut, CH–5232 Villigen PSI, SwitzerlandPhysik-Institut, Universität Zürich, Winterthurerstrasse 190, CH–8057 Zürich, Switzerland; Paul Scherrer Institut, CH–5232 Villigen PSI, SwitzerlandPhysik-Institut, Universität Zürich, Winterthurerstrasse 190, CH–8057 Zürich, Switzerland; Paul Scherrer Institut, CH–5232 Villigen PSI, SwitzerlandInstitute of Physics, Bhubaneswar, Sachivalaya Marg, Sainik School, Bhubaneswar 751005, India; Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400094, IndiaSchool of Physics and Institute for Collider Particle Physics, University of the Witwatersrand, Johannesburg, Wits 2050, South Africa; iThemba LABS, National Research Foundation, PO Box 722, Somerset West 7129, South AfricaThe multi-lepton anomalies suggest the existence of a new scalar with a mass between 145 GeV and 155 GeV, which is compatible with indications of the associated production of a narrow resonance with a mass of ≈151 GeV. These anomalies require a sizable branching fraction of the new scalar to WW. However, because no ZZ signal at this mass has been observed, this implies that the new boson could be the neutral component of an SU(2)L triplet with zero hypercharge. This field leads to a positive definite shift in the W mass and is produced via the Drell-Yan process pp→W⁎→Δ0Δ±. We use the side-bands of the ATLAS analysis [1] of the associated production of the Standard Model Higgs in the di-photon channel to search for this production mode of the triplet. Since the dominant decays of Δ± depend only on its mass, the effect in the 22 signal categories considered by ATLAS is completely correlated. Combining all channels in a likelihood ratio test, we find that a non-zero Br[Δ0→γγ], with a best-fit value of 0.66%, is preferred by ≈3σ for a mass of ≈151.5 GeV. While this mass is consistent with the multi-lepton anomalies, there is also an excess at ≈127 GeV with a significance of 3.6σ. However, the latter is inconsistent with the mass predicted by the multi-lepton anomalies and is in close proximity to the SM Higgs mass, suggesting the possibility of enhanced associated production of the SM Higgs.http://www.sciencedirect.com/science/article/pii/S0370269325000589 |
| spellingShingle | Saiyad Ashanujjaman Sumit Banik Guglielmo Coloretti Andreas Crivellin Siddharth P. Maharathy Bruce Mellado Explaining the γγ + X excesses at ≈151.5 GeV via the Drell-Yan production of a Higgs triplet Physics Letters B |
| title | Explaining the γγ + X excesses at ≈151.5 GeV via the Drell-Yan production of a Higgs triplet |
| title_full | Explaining the γγ + X excesses at ≈151.5 GeV via the Drell-Yan production of a Higgs triplet |
| title_fullStr | Explaining the γγ + X excesses at ≈151.5 GeV via the Drell-Yan production of a Higgs triplet |
| title_full_unstemmed | Explaining the γγ + X excesses at ≈151.5 GeV via the Drell-Yan production of a Higgs triplet |
| title_short | Explaining the γγ + X excesses at ≈151.5 GeV via the Drell-Yan production of a Higgs triplet |
| title_sort | explaining the γγ x excesses at ≈151 5 gev via the drell yan production of a higgs triplet |
| url | http://www.sciencedirect.com/science/article/pii/S0370269325000589 |
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