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Search: authors:"Zhaofeng Kang"

9 papers found.
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Uncover compressed supersymmetry via boosted bosons from the heavier stop/sbottom

A light stop around the weak scale is a hopeful messenger of natural supersymmetry (SUSY), but it has not shown up at the current stage of LHC. Such a situation raises the question of the fate of natural SUSY. Actually, a relatively light stop can easily be hidden in a compressed spectra such as mild mass degeneracy between stop and neutralino plus top quark. Searching for such a...

Upgrading sterile neutrino dark matter to FImP using scale invariance

In this article we propose a class of extremely light feebly interacting massive particle, FImPs. They are combination of feebly interacting massive particle with scale invariance, by which DM stability, mass origin and relic density are inherently related. In the scale invariant version of the Standard Model (SM) with three right-handed neutrinos (\(\nu \)SISM), the lightest...

Naturally large radiative lepton flavor violating Higgs decay mediated by lepton-flavored dark matter

In the standard model (SM), lepton flavor violating (LFV) Higgs decay is absent at renormalizable level and thus it is a good probe to new physics. In this article we study a type of new physics that could lead to large LFV Higgs decay, i.e., a lepton-flavored dark matter (DM) model which is specified by a Majorana DM and scalar lepton mediators. Different from other similar...

The maximal \(U(1)_L\) inverse seesaw from \(d=5\) operator and oscillating asymmetric Sneutrino dark matter

The maximal \(U(1)_L\) supersymmetric inverse seesaw mechanism (MLSIS) provides a natural way to relate asymmetric dark matter (ADM) with neutrino physics. In this paper we point out that MLSIS is a natural outcome if one dynamically realizes the inverse seesaw mechanism in the next-to minimal supersymmetric standard model (NMSSM) via the dimension-five operator \((N)^2S^2/M_...

Light doubly charged Higgs boson via the \(WW^*\) channel at LHC

The doubly charged Higgs bosons \(H^{\pm \pm }\) searches at the large hadron collider (LHC) have been studied extensively and strong bound is available for \(H^{\pm \pm }\) dominantly decaying into a pair of same-sign di-leptons. In this paper we point out that there is a large cavity in the light \(H^{\pm \pm }\) mass region left unexcluded. In particular, \(H^{\pm \pm }\) can...

LHC τ -rich tests of lepton-specific 2HDM for (g − 2) μ

The lepton-sepcific (or type X) 2HDM (L2HDM) is an attractive new physics candidate explaining the muon g − 2 anomaly requiring a light CP-odd boson A and large tan β. This scenario leads to τ -rich signatures, such as 3τ , 4τ and 4τ + W/Z, which can be readily accessible at the LHC. We first study the whole L2HDM parameter space to identify allowed regions of extra Higgs boson...

Simplified supersymmetry with sneutrino LSP at 8 TeV LHC

The current searches of supersymmetry (SUSY) are based on the neutralino lightest sparticle (LSP). In this article we instead focus on SUSY with sneutrino LSP. It is well motivated in many contexts, especially in which sneutrino services as a dark matter candidate. We first develop a simplified model, which contains the stop, chargino/neutralino and sneutrino, to describe the LHC...

Higgs boson mass and complex sneutrino dark matter in the supersymmetric inverse seesaw models

The discovery of a relatively heavy Standard Model (SM)-like Higgs boson challenges naturalness of the minimal supersymmetric standard model (MSSM) from both Higgs and dark matter (DM) sectors. We study these two aspects in the MSSM extended by the low-scale inverse seesaw mechanism. Firstly, it admits a sizable radiative contribution to the Higgs boson mass m h , up to ~4 GeV in...