Exploring $Z'$ and Right-Handed Neutrinos in the BLSM at the Large Hadron Collider
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| Format: | Preprint |
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2024
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| _version_ | 1866912532683292672 |
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| author | Chamoun, Nidal Ezzat, Kareem Khalil, Shaaban Sengupta, Rhitaja |
| author_facet | Chamoun, Nidal Ezzat, Kareem Khalil, Shaaban Sengupta, Rhitaja |
| contents | We study the collider phenomenology of the $B$-$L$ extension of the Standard Model (BLSM), focusing on the production and decay of a heavy neutral gauge boson (\( Z' \)) at the Large Hadron Collider (LHC). In this framework, the \( Z' \) can decay into pairs of heavy right-handed neutrinos (\( ν_R \)), which subsequently decay into charged leptons and \( W \) bosons. These processes give rise to three distinctive final states: (i) two leptons plus four jets (\( 2\ell + 4j \)), (ii) four leptons plus missing transverse energy (\( 4\ell + \text{MET} \)), and (iii) three leptons plus two jets and MET (\( 3\ell + 2j + \text{MET} \)). %
To enhance signal sensitivity and suppress Standard Model backgrounds, we employ multivariate analysis techniques based on Boosted Decision Trees (BDTs), as well as selection optimizations using the \texttt{XGBOOST} framework. The classifiers are trained on kinematic observables sensitive to the masses of the \( Z' \) and \( ν_R \). We demonstrate that all three final states offer significant discovery potential for both the \( Z' \) and heavy \( ν_R \) at the High-Luminosity LHC. Our results highlight the testability of the BLSM at current and future collider experiments, and provide a promising avenue for probing the origin of neutrino masses and the baryon asymmetry of the Universe. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_19269 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Exploring $Z'$ and Right-Handed Neutrinos in the BLSM at the Large Hadron Collider Chamoun, Nidal Ezzat, Kareem Khalil, Shaaban Sengupta, Rhitaja High Energy Physics - Phenomenology High Energy Physics - Experiment We study the collider phenomenology of the $B$-$L$ extension of the Standard Model (BLSM), focusing on the production and decay of a heavy neutral gauge boson (\( Z' \)) at the Large Hadron Collider (LHC). In this framework, the \( Z' \) can decay into pairs of heavy right-handed neutrinos (\( ν_R \)), which subsequently decay into charged leptons and \( W \) bosons. These processes give rise to three distinctive final states: (i) two leptons plus four jets (\( 2\ell + 4j \)), (ii) four leptons plus missing transverse energy (\( 4\ell + \text{MET} \)), and (iii) three leptons plus two jets and MET (\( 3\ell + 2j + \text{MET} \)). % To enhance signal sensitivity and suppress Standard Model backgrounds, we employ multivariate analysis techniques based on Boosted Decision Trees (BDTs), as well as selection optimizations using the \texttt{XGBOOST} framework. The classifiers are trained on kinematic observables sensitive to the masses of the \( Z' \) and \( ν_R \). We demonstrate that all three final states offer significant discovery potential for both the \( Z' \) and heavy \( ν_R \) at the High-Luminosity LHC. Our results highlight the testability of the BLSM at current and future collider experiments, and provide a promising avenue for probing the origin of neutrino masses and the baryon asymmetry of the Universe. |
| title | Exploring $Z'$ and Right-Handed Neutrinos in the BLSM at the Large Hadron Collider |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2412.19269 |