Search for direct production of electroweakinos in final states with one lepton, jets and missing transverse momentum in pp collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
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arXiv
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| Natura: | Preprint |
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2023
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| _version_ | 1866909143330193408 |
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| author | ATLAS Collaboration |
| author_facet | ATLAS Collaboration |
| contents | Searches for electroweak production of chargino pairs, $\tildeχ^{+}_{1}\tildeχ^{-}_{1}$, and of chargino and next-to-lightest neutralino, $\tildeχ^{\pm}_{1}\tildeχ^{0}_{2}$, are presented. The models explored assume that the charginos decay into a $W$ boson and the lightest neutralino, $\tildeχ^{\pm}_1 \rightarrow W^{\pm} \tildeχ^{0}_{1}$. The next-to-lightest neutralinos are degenerate in mass with the chargino and decay to $\tildeχ^{0}_{1}$ and either a $Z$ or a Higgs boson, $\tildeχ^{0}_{2} \rightarrow Z \tildeχ^{0}_{1}$ or $h \tildeχ^{0}_{1}$. The searches exploit the presence of a single isolated lepton and missing transverse momentum from the $W$ boson decay products and the lightest neutralinos, and the presence of jets from hadronically decaying $Z$ or $W$ bosons or from the Higgs boson decaying into a pair of $b$-quarks. The searches use 139 fb$^{-1}$ of $\sqrt{s}= 13$ TeV proton-proton collisions data collected by the ATLAS detector at the Large Hadron Collider between 2015 and 2018. No deviations from the Standard Model expectations are found, and 95% confidence level exclusion limits are set. Chargino masses ranging from 260 to 520 GeV are excluded for a massless $\tildeχ^{0}_{1}$ in chargino pair production models. Degenerate chargino and next-to-lightest neutralino masses ranging from 260 to 420 GeV are excluded for a massless $\tildeχ^{0}_{1}$ for $\tildeχ^{0}_{2} \rightarrow Z \tildeχ^{0}_{1}$. For decays through an on-shell Higgs boson and for mass-splitting between $\tildeχ^{\pm}_{1} / \tildeχ^{0}_{2}$ and $\tildeχ^{0}_{1}$ as small as the Higgs boson mass, mass limits are improved by up to 40 GeV in the range of 200-260 GeV and 280-470 GeV compared to previous ATLAS constraints. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_08171 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Search for direct production of electroweakinos in final states with one lepton, jets and missing transverse momentum in pp collisions at $\sqrt{s}=13$ TeV with the ATLAS detector ATLAS Collaboration High Energy Physics - Experiment Searches for electroweak production of chargino pairs, $\tildeχ^{+}_{1}\tildeχ^{-}_{1}$, and of chargino and next-to-lightest neutralino, $\tildeχ^{\pm}_{1}\tildeχ^{0}_{2}$, are presented. The models explored assume that the charginos decay into a $W$ boson and the lightest neutralino, $\tildeχ^{\pm}_1 \rightarrow W^{\pm} \tildeχ^{0}_{1}$. The next-to-lightest neutralinos are degenerate in mass with the chargino and decay to $\tildeχ^{0}_{1}$ and either a $Z$ or a Higgs boson, $\tildeχ^{0}_{2} \rightarrow Z \tildeχ^{0}_{1}$ or $h \tildeχ^{0}_{1}$. The searches exploit the presence of a single isolated lepton and missing transverse momentum from the $W$ boson decay products and the lightest neutralinos, and the presence of jets from hadronically decaying $Z$ or $W$ bosons or from the Higgs boson decaying into a pair of $b$-quarks. The searches use 139 fb$^{-1}$ of $\sqrt{s}= 13$ TeV proton-proton collisions data collected by the ATLAS detector at the Large Hadron Collider between 2015 and 2018. No deviations from the Standard Model expectations are found, and 95% confidence level exclusion limits are set. Chargino masses ranging from 260 to 520 GeV are excluded for a massless $\tildeχ^{0}_{1}$ in chargino pair production models. Degenerate chargino and next-to-lightest neutralino masses ranging from 260 to 420 GeV are excluded for a massless $\tildeχ^{0}_{1}$ for $\tildeχ^{0}_{2} \rightarrow Z \tildeχ^{0}_{1}$. For decays through an on-shell Higgs boson and for mass-splitting between $\tildeχ^{\pm}_{1} / \tildeχ^{0}_{2}$ and $\tildeχ^{0}_{1}$ as small as the Higgs boson mass, mass limits are improved by up to 40 GeV in the range of 200-260 GeV and 280-470 GeV compared to previous ATLAS constraints. |
| title | Search for direct production of electroweakinos in final states with one lepton, jets and missing transverse momentum in pp collisions at $\sqrt{s}=13$ TeV with the ATLAS detector |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2310.08171 |