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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
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2024
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2407.16806 |
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| _version_ | 1866908586455597056 |
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| author | Sharma, Pramod Mulaudzi, Anza-Tshilidzi Mosala, Karabo Mathaha, Thuso Kumar, Mukesh Mellado, Bruce Crivellin, Andreas Titov, Maxim Ruan, Manqi Fang, Yaquan |
| author_facet | Sharma, Pramod Mulaudzi, Anza-Tshilidzi Mosala, Karabo Mathaha, Thuso Kumar, Mukesh Mellado, Bruce Crivellin, Andreas Titov, Maxim Ruan, Manqi Fang, Yaquan |
| contents | The Large Electron Positron collider observed an indication for a new Higgs boson with a mass around $95$\,GeV-$100$\,GeV in the process $e^+e^-\to Z^*\to ZS$ with $S\to b\bar b$. The interest in this excess re-emerged with the di-photon signature at $\approx$\,95\,GeV at the Large Hadron Collider. In fact, a combined global significance of $3.4σ$ is obtained once $WW$ and $ττ$ signals are included in addition. In this article, we perform a feasibility study for discovering such a new scalar $S$ at future electron-positron colliders using the recoil-mass method applied to $e^{+} e^{-} \to ZS$ with $Z \rightarrow μ^{+} μ^{-}$ and $S \to b \bar{b}$. For this, we employ a Deep Neural Network to enhance the separation between the Standard Model background and the signal, reducing the required integrated luminosity necessary for discovery by a factor of two to three. As a result, an $SU(2)_L$ singlet Higgs with a mass of $\approx$\,95\,GeV can be observed with more than 5$σ$ significance at a 250\,GeV centre-of-mass energy collider with $5~ {\rm ab}^{-1}$ integrated luminosity if it has a mixing angle of at least $0.1$ with the Standard Model Higgs, which means that a discovery can be achieved within the whole 95\% confidence-level region preferred by Large Electron Positron excess. Furthermore, including more decay channels such as $S\to ττ$ and $Z\to e^+e^-$ further enhances the discovery potential of future $e^+e^-$ accelerators, like CEPC, CLIC, FCC-ee and ILC. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_16806 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Discovery Potential of Future Electron-Positron Colliders for a 95 GeV Scalar Sharma, Pramod Mulaudzi, Anza-Tshilidzi Mosala, Karabo Mathaha, Thuso Kumar, Mukesh Mellado, Bruce Crivellin, Andreas Titov, Maxim Ruan, Manqi Fang, Yaquan High Energy Physics - Phenomenology The Large Electron Positron collider observed an indication for a new Higgs boson with a mass around $95$\,GeV-$100$\,GeV in the process $e^+e^-\to Z^*\to ZS$ with $S\to b\bar b$. The interest in this excess re-emerged with the di-photon signature at $\approx$\,95\,GeV at the Large Hadron Collider. In fact, a combined global significance of $3.4σ$ is obtained once $WW$ and $ττ$ signals are included in addition. In this article, we perform a feasibility study for discovering such a new scalar $S$ at future electron-positron colliders using the recoil-mass method applied to $e^{+} e^{-} \to ZS$ with $Z \rightarrow μ^{+} μ^{-}$ and $S \to b \bar{b}$. For this, we employ a Deep Neural Network to enhance the separation between the Standard Model background and the signal, reducing the required integrated luminosity necessary for discovery by a factor of two to three. As a result, an $SU(2)_L$ singlet Higgs with a mass of $\approx$\,95\,GeV can be observed with more than 5$σ$ significance at a 250\,GeV centre-of-mass energy collider with $5~ {\rm ab}^{-1}$ integrated luminosity if it has a mixing angle of at least $0.1$ with the Standard Model Higgs, which means that a discovery can be achieved within the whole 95\% confidence-level region preferred by Large Electron Positron excess. Furthermore, including more decay channels such as $S\to ττ$ and $Z\to e^+e^-$ further enhances the discovery potential of future $e^+e^-$ accelerators, like CEPC, CLIC, FCC-ee and ILC. |
| title | Discovery Potential of Future Electron-Positron Colliders for a 95 GeV Scalar |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2407.16806 |