Abstract
Top-squarks (stop) play an important role in SUSY naturalness. The stop pair production is considered as the most effective way to search for stop at the LHC. However, the collider signature of stop pair production is usually characterized by tt¯ plus missing transverse energy, which is also predicted in many other non-supersymmetric models. On the other hand, the single stop production via the electroweak interaction can provide some distinctive signatures, and thus will help to confirm the existence of the stop. In this paper, we investigate the observability of the mono-b events from the single stop production process pp→t˜1χ˜1−→b+E̸T in a simplified MSSM framework where the higgsinos and stops are the only sparticles at the HL-LHC and HE-LHC. We find that the stop mass and the higgsino mass may be probed up to about 1.6 TeV and 550 GeV at 5σ level at the HE-LHC with the integrated luminosity L=15ab−1. We also present the 2σ exclusion limits of the stop mass at the HL-LHC and HE-LHC.
Highlights
With the Higgs boson discovered in 2012 [1,2], the last piece of the puzzle of the Standard Model (SM) was found
We investigate the single stop production process pp → t1χ1− in a simplified framework where the higgsinos and stops are the only sparticles in the minimal supersymmetric standard model (MSSM) at the High Luminosity LHC (HL-LHC) and HE
We find that the stop mass mt1 and the higgsino mass μ can be excluded up to roughly 1.25 TeV and 350 GeV at 2σ level at the HL-LHC, respectively
Summary
With the Higgs boson discovered in 2012 [1,2], the last piece of the puzzle of the Standard Model (SM) was found. It should be noted that the thermal relic density of the light higgsino-like neutralino dark matter is typically low because of the large annihilation rate in the early universe [40,41,42,43,44,45,46]. This leads to the standard thermally produced WIMP dark matter inadequate in the natural SUSY.
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