Searching for stop LSP at the LHC

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作者
Essodjolo Kpatcha
Iñaki Lara
Daniel E. López-Fogliani
Carlos Muñoz
Natsumi Nagata
Hidetoshi Otono
机构
[1] Instituto de Física Teórica (IFT) UAM-CSIC,Departamento de Física Teórica
[2] Universidad Autónoma de Madrid (UAM),Faculty of Physics
[3] Université Paris-Saclay,Instituto de Física de Buenos Aires UBA and CONICET, Departamento de Física, Facultad de Ciencia Exactas y Naturales
[4] CNRS/IN2P3,Department of Physics
[5] IJCLab,Research Center for Advanced Particle Physics
[6] University of Warsaw,undefined
[7] Universidad de Buenos Aires,undefined
[8] Pontificia Universidad Católica Argentina,undefined
[9] University of Tokyo,undefined
[10] Kyushu University,undefined
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We analyze relevant signals expected at the LHC for a stop as the lightest supersymmetric particle (LSP). The discussion is carried out in the framework of the μν\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\mu \nu $$\end{document}SSM, where the presence of R-parity violating couplings involving right-handed neutrinos solves the μ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\mu $$\end{document}-problem and reproduces neutrino data. The stops are pair produced at the LHC, decaying with displaced vertices to a lepton and a bottom quark or a neutrino and a top quark. We compare the predictions of this scenario with ATLAS and CMS searches for long-lived particles. To analyze the parameter space we sample the μν\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\mu \nu $$\end{document}SSM for a stop LSP using a likelihood data-driven method, and paying special attention to reproduce the current experimental data on neutrino and Higgs physics, as well as flavor observables. Our results translate into a lower limit on the mass of the left (right) stop LSP of 1068 GeV (1341 GeV), corresponding to a decay length of 1.86 mm (6.61 mm).
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