Searching for a squark LSP of the first two families at the LHC
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arXiv
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| Natura: | Preprint |
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2024
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| author | Knees, Paulina Kpatcha, Essodjolo Lara, Iñaki López-Fogliani, Daniel E. Muñoz, Carlos |
| author_facet | Knees, Paulina Kpatcha, Essodjolo Lara, Iñaki López-Fogliani, Daniel E. Muñoz, Carlos |
| contents | We analyse relevant signals expected at the LHC for a squark of the first two families as the lightest supersymmetric particle (LSP). The discussion is established in the framework of the $μν$SSM, where the presence of $R$-parity violating couplings involving right-handed neutrinos solves simultaneously the $μ$-problem and the accommodation of neutrino masses and mixing angles. The squarks are pair produced and decay dominantly to a neutrino and a quark. They also have two sub-dominant three body decays to quark, Higgs and neutrino/charged lepton. The decays can be prompt or displaced, depending on the regions of the parameter space of the model. We focus the analyses on squarks of right up-type, right down-type, and left up-type; since squarks of left down-type cannot be the LSP because of D-term contributions. We compare the predictions of these scenarios with ATLAS and CMS searches for prompt and long-lived particles. To analyse the parameter space we sample the $μν$SSM for a squark LSP, paying special attention to reproduce the current experimental data on neutrino and Higgs physics, as well as flavour observables. Because of the contribution of squark-squark final states to the production cross section, the results depend on the squark family. In particular, for a right strange squark LSP, the lower limit on the mass is $1646$ GeV, corresponding to an upper limit on the decay length of $54.7$ mm, and for a right (left) scharm LSP, the limits are $1625$ ($1357$) GeV and $13.4$ ($1.9$) mm. However, the first family of squarks as LSP turns out to be excluded, unless the gluino is heavier than $7$ TeV, which produces a limit on the squark mass of $1800$ GeV. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2411_07278 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Searching for a squark LSP of the first two families at the LHC Knees, Paulina Kpatcha, Essodjolo Lara, Iñaki López-Fogliani, Daniel E. Muñoz, Carlos High Energy Physics - Phenomenology High Energy Physics - Experiment We analyse relevant signals expected at the LHC for a squark of the first two families as the lightest supersymmetric particle (LSP). The discussion is established in the framework of the $μν$SSM, where the presence of $R$-parity violating couplings involving right-handed neutrinos solves simultaneously the $μ$-problem and the accommodation of neutrino masses and mixing angles. The squarks are pair produced and decay dominantly to a neutrino and a quark. They also have two sub-dominant three body decays to quark, Higgs and neutrino/charged lepton. The decays can be prompt or displaced, depending on the regions of the parameter space of the model. We focus the analyses on squarks of right up-type, right down-type, and left up-type; since squarks of left down-type cannot be the LSP because of D-term contributions. We compare the predictions of these scenarios with ATLAS and CMS searches for prompt and long-lived particles. To analyse the parameter space we sample the $μν$SSM for a squark LSP, paying special attention to reproduce the current experimental data on neutrino and Higgs physics, as well as flavour observables. Because of the contribution of squark-squark final states to the production cross section, the results depend on the squark family. In particular, for a right strange squark LSP, the lower limit on the mass is $1646$ GeV, corresponding to an upper limit on the decay length of $54.7$ mm, and for a right (left) scharm LSP, the limits are $1625$ ($1357$) GeV and $13.4$ ($1.9$) mm. However, the first family of squarks as LSP turns out to be excluded, unless the gluino is heavier than $7$ TeV, which produces a limit on the squark mass of $1800$ GeV. |
| title | Searching for a squark LSP of the first two families at the LHC |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2411.07278 |