2022/06/15(Wed)
15:00 -16:30
視訊演講 Video Seminar [ Meeting Link / ID: 2514 554 2533 / Password: aPWp63bNRJ4 ]
Title
Leptonic Scalar Dark Matter and Higgs Phenomenology at Hadron Colliders
Speaker
Prof. Chung Kao (University of Oklahoma)Abstract
We adopt a simple model with self interacting dark matter and focus on the effects of Sommerfeld enhancement. In this model, the dark matter candidate is a leptonic scalar particle with a light mediator. We have found favored regions of the parameter space with proper masses and coupling strength generating a relic density that is consistent with the observed CDM relic density. Furthermore, this model satisfies the constraints of recent direct searches and indirect detection for dark matter as well as the observed small-scale structure of the Universe. Furthermore, we present the prospects of discovering the top quark decay into a charm quark and a Higgs boson (????→????ℎ0) in top quark pair production at the CERN Large Hadron Collider (LHC). A general two Higgs doublet model is adopted to study flavor changing neutral Higgs (FCNH) interactions. We perform a parton level analysis as well as Monte Carlo simulations to study the flavor changing top quark decay ????→????ℎ0, followed by the Higgs decaying into ????+????−. To reduce the physics background to the Higgs signal, only the leptonic decays of tau leptons are considered, ????+????−→????±????∓+ MET, where MET represents the missing transverse energy from the neutrinos. In addition, we discuss the prospects of discovering heavy SUSY neutral Higgs bosons H and A decaying into light plus heavy chargino pairs which can yield a four isolated lepton plus missing transverse energy signature at the LHC and at a future 100 TeV pp collider. For FCC-hh or SPPC, we study the H, A→ SUSY reaction along with dominant physics backgrounds from the Standard Model and devise suitable selection requirements to extract a clean signal for FCC-hh or SPPC. We find that while a conventional cut-and-count analysis yields a signal statistical significance greater than 5σ for mA,H∼1.1−1.65 TeV, a boosted-decision-tree analysis allows for heavy Higgs signal discovery at FCC-hh or SPPC for mA,H∼1−2 TeV.
Language
演講語言 (Language): in English
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