Gluino Search with Stop and Top in Nonuniversal Gaugino Mass Models at LHC and Future Colliders

Abstract

We discuss the gluino mass in the CMSSM and Nonuniversal Gaugino Mass Models (NUGM) frameworks in light of the results from the current LHC and Dark Matter experiments. We probe the gluino mass scales by considering its decay modes into stop and top quarks, $\tilde{g}\to {\tilde{t}}_{1}t$ and $\tilde{g}\to \bar{t}t{\tilde{\chi }}_1^0$, where ${\tilde{t}}_{1}t$ represents both ${\tilde{t}}_1\bar{t}$ and ${\tilde{t}}_1^{\ast }t$. The region with $m_{\tilde{g}}\lesssim 2$ TeV is excluded up to $68\%$ CL in the CMSSM if the gluino decays into a stop and top quark, while the $95\%$ CL exclusion requires $m_{\tilde{g}}\gtrsim 1.9$ TeV. Such exclusion bounds on the gluino mass more or less overlap with the current LHC results. The decay mode $\tilde{g}\to \bar{t}t{\tilde{\chi }}_1^0$ may take over if $\tilde{g}\to {\tilde{t}}_{1}t$ is not allowed. One can probe the gluino mass in this case up to about 1.5 TeV with $68\%$ CL in the CMSSM, and about 1.4 TeV with $95\%$ CL. A similar analyses in the NUGM framework yield exclusion curves for the gluino mass $m_{\tilde{g}}\gtrsim 2.1$ TeV at 14 TeV for both decay modes of the gluino under consideration. We also show that increasing the center of mass energy to 27 TeV can probe the gluino mass up to about 3 TeV through its decay mode into stop and top quark. The Dark Matter constraints are not very severe in the framework of NUGM, and they allow solutions with $m_{\tilde{g}},m_{\tilde{t}}\gtrsim 1$ TeV. In addition, with NUGM the LSP neutralino can coannihilate with gluino and/or stop for $m_{\tilde{g}},m_{\tilde{t}}\approx m_{{\tilde{\chi }}_1^0}\in [0.9-1.5]$ TeV. The 100 TeV FCC collider can probe the gluino masses up to about 6 TeV with $36.1f{b}^{-1}$ integrated luminosity. We also find that the decay $\tilde{g}\to \tilde{t}t$ can indirectly probe the stop mass up to about 4 TeV.

References in corpus (18)

• Planck 2018 results. I. Overview and the cosmological legacy of Planck
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• The Physics of Heavy Z' Gauge Bosons
• micrOMEGAs3.1 : a program for calculating dark matter observables
• Squark and gluino production cross sections in pp collisions at $\sqrt{s}$ = 13, 14, 33 and 100 TeV
• Averages of b-hadron, c-hadron, and tau-lepton Properties
• Search for squarks and gluinos in final states with jets and missing transverse momentum using 36 fb${}^{-1}$ of $\sqrt{s}$=13 TeV $pp$ collision data with the ATLAS detector
• Search for pair production of gluinos decaying via stop and sbottom in events with $b$-jets and large missing transverse momentum in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• t-b-tau Yukawa unification for mu < 0 with a sub-TeV sparticle spectrum
• Search for squarks and gluinos in events with an isolated lepton, jets, and missing transverse momentum at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• NLSP Gluino and NLSP Stop Scenarios from b-tau Yukawa Unification
• Non-universal gaugino masses and semi-natural supersymmetry in view of the Higgs boson discovery
• The Reach of the High-Energy LHC for Gluinos and Top Squarks in SUSY Models with Light Higgsinos
• Sparticle mass spectra from SU(5) SUSY GUT models with $b-\tau$ Yukawa coupling unification
• Search for squarks and gluinos in final states with hadronically decaying $\tau$-leptons, jets, and missing transverse momentum using $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• What hadron collider is required to discover or falsify natural supersymmetry?
• Discovery and Identification of Extra Neutral Gauge Bosons at the LHC
• Yukawa Unification with Four Higgs Doublets in Supersymmetric GUT

Cited by in corpus (1)

• Stop Search in SUSY SO(10) GUTs with Nonuniversal Gaugino Masses