Minimal dark matter model for muon g-2 with scalar lepton partners up to the TeV scale

  • Event Date: 2022-11-28
  • High energy phenomenology
  • Speaker: Jan Tristram Acuña 安建宇 (NTHU)  /  Host: Dr. Girish Kumar
    Place: R517, New Physics Building, NTU

Title:Minimal dark matter model for muon g-2 with scalar lepton partners up to the TeV scale
Time:2022/11/28 (Mon.) 12:30
Place:R517, New Physics Building, NTU

Abstract:
Thewell-known 4.2-sigma discrepancy between the SM prediction and the measured value of the muon g-2 is a result that might provide a hint of new physics. On the other hand, a related problem concerns the identification of the nature of dark matter, which could be embedded in extensions of the SM. In this talk, I will make an attempt to address both issues by presenting a minimal BSM framework, which consists of the following extra particle states: a SM singlet Majorana fermion, referred to as the Bino, playing the role of DM; and muonic scalars, referred to as sleptons. The sleptons, SM muon, and the Bino interact in a manner similar to gaugino interactions in the MSSM. The presence of left-right mixing among the scalar muonic partners, at a level that breaks the assumption of minimal flavor violation, allows for a sufficient contribution to close the tension. We demonstrate that the relic density constraint can also be satisfied if we consider coannihilations among the extra species in the spectrum, which opens up anew viable parameter region, namely sizable smuon mixing and particle masses at the TeV scale, beyond what has been identified in old MSSM scans. Additional constraints from perturbative unitarity and metastability of the electroweak vacuum can be imposed on the model. Meanwhile, we show that future generation liquid noble gas detectors are marginally sensitive to the region of the parameter space that satisfies both the g-2 and relic density limits. This motivates the exploration of alternative methods of probing our model, such as neutronstar kinetic heating, which may provide better sensitivity than conventional dark matter searches