Collaboration, ATLAS
(2023)
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.
[Preprint]
|
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2310.08171v1.pdf - Other Download (2MB) | Preview |
Abstract
Searches for electroweak production of chargino pairs, $\tilde{\chi}^{+}_{1}\tilde{\chi}^{-}_{1}$, and of chargino and next-to-lightest neutralino, $\tilde{\chi}^{\pm}_{1}\tilde{\chi}^{0}_{2}$, are presented. The models explored assume that the charginos decay into a $W$ boson and the lightest neutralino, $\tilde{\chi}^{\pm}_1 \rightarrow W^{\pm} \tilde{\chi}^{0}_{1}$. The next-to-lightest neutralinos are degenerate in mass with the chargino and decay to $\tilde{\chi}^{0}_{1}$ and either a $Z$ or a Higgs boson, $\tilde{\chi}^{0}_{2} \rightarrow Z \tilde{\chi}^{0}_{1}$ or $h \tilde{\chi}^{0}_{1}$. 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 $\tilde{\chi}^{0}_{1}$ in chargino pair production models. Degenerate chargino and next-to-lightest neutralino masses ranging from 260 to 420 GeV are excluded for a massless $\tilde{\chi}^{0}_{1}$ for $\tilde{\chi}^{0}_{2} \rightarrow Z \tilde{\chi}^{0}_{1}$. For decays through an on-shell Higgs boson and for mass-splitting between $\tilde{\chi}^{\pm}_{1} / \tilde{\chi}^{0}_{2}$ and $\tilde{\chi}^{0}_{1}$ 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.
| Item Type: | Preprint |
|---|---|
| Additional Information: | 60 pages in total, authorlist starting on page 43, 10 figures, 12 tables, published in JHEP12(2023)167. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2023-01 |
| Uncontrolled Keywords: | hep-ex, hep-ex |
| Divisions: | Faculty of Science and Engineering > School of Physical Sciences |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 27 Oct 2023 07:42 |
| Last Modified: | 02 Apr 2024 09:30 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3176469 |
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