Combined Explanation of LHC Multi-Lepton, Di-Photon and Top-Quark Excesses
Fuente:
arXiv
Salvato in:
| Autori principali: | , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2023
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866916423007207424 |
|---|---|
| author | Coloretti, Guglielmo Crivellin, Andreas Mellado, Bruce |
| author_facet | Coloretti, Guglielmo Crivellin, Andreas Mellado, Bruce |
| contents | The LHC analyses of processes containing two or more leptons and missing energy, possibly in association with b-jets, show strong tensions with the Standard Model predictions and are known as multi-lepton anomalies. In particular, top-quark differential distributions point towards the associated production of new Higgs bosons decaying into bottom quarks and W bosons ($>5σ$) with masses consistent with the di-photon excesses at 95GeV and 152GeV ($3.8σ$ and $4.9σ$, respectively). Furthermore, CMS found indications for resonant top-quark pair production at 400GeV ($3.5σ$) and both ATLAS and CMS reported elevated four-top and ttW cross-sections. In this article, we propose a combined explanation of these excesses by supplementing the SM Higgs with a second scalar doublet, a real scalar singlet ($S$) and a Higgs triplet with $Y=0$ ($Δ$); the $Δ$2HDMS. We fix the masses of the neutral triplet-like and the singlet-like scalars by the di-photon excesses, i.e. $m_{Δ^0}=152$GeV and $m_S=95$GeV, respectively. Here, H, the CP-even component of the second doublet, is produced via gluon fusion from a top-loop and decays dominantly to $S+Δ^0$ whose subsequent decays to WW and bb explain the differential top-quark distributions for $σ(pp\to H\to SΔ^0)\approx6$pb. Fixing the top-Yukawa accordingly, the CP-odd Higgs boson A turns out to have the right production cross-section to account for the resonant top-pair excess at 400GeV, while the top-associated production of H and A results in new physics pollution of Standard Model ttW and four-top cross sections, as preferred by the data. Furthermore, a positive shift in the W mass is naturally induced by the vacuum expectation value of the triplet and we show that the most relevant signal strengths of the 152GeV boson are compatible with the process $pp\to H\to Δ^0S$ if S is allowed to decay invisibly. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_17314 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Combined Explanation of LHC Multi-Lepton, Di-Photon and Top-Quark Excesses Coloretti, Guglielmo Crivellin, Andreas Mellado, Bruce High Energy Physics - Phenomenology High Energy Physics - Experiment The LHC analyses of processes containing two or more leptons and missing energy, possibly in association with b-jets, show strong tensions with the Standard Model predictions and are known as multi-lepton anomalies. In particular, top-quark differential distributions point towards the associated production of new Higgs bosons decaying into bottom quarks and W bosons ($>5σ$) with masses consistent with the di-photon excesses at 95GeV and 152GeV ($3.8σ$ and $4.9σ$, respectively). Furthermore, CMS found indications for resonant top-quark pair production at 400GeV ($3.5σ$) and both ATLAS and CMS reported elevated four-top and ttW cross-sections. In this article, we propose a combined explanation of these excesses by supplementing the SM Higgs with a second scalar doublet, a real scalar singlet ($S$) and a Higgs triplet with $Y=0$ ($Δ$); the $Δ$2HDMS. We fix the masses of the neutral triplet-like and the singlet-like scalars by the di-photon excesses, i.e. $m_{Δ^0}=152$GeV and $m_S=95$GeV, respectively. Here, H, the CP-even component of the second doublet, is produced via gluon fusion from a top-loop and decays dominantly to $S+Δ^0$ whose subsequent decays to WW and bb explain the differential top-quark distributions for $σ(pp\to H\to SΔ^0)\approx6$pb. Fixing the top-Yukawa accordingly, the CP-odd Higgs boson A turns out to have the right production cross-section to account for the resonant top-pair excess at 400GeV, while the top-associated production of H and A results in new physics pollution of Standard Model ttW and four-top cross sections, as preferred by the data. Furthermore, a positive shift in the W mass is naturally induced by the vacuum expectation value of the triplet and we show that the most relevant signal strengths of the 152GeV boson are compatible with the process $pp\to H\to Δ^0S$ if S is allowed to decay invisibly. |
| title | Combined Explanation of LHC Multi-Lepton, Di-Photon and Top-Quark Excesses |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2312.17314 |