TeV scale mirage mediation in NMSSM and precision Higgs measurement

TL;DR

This paper explores TeV scale mirage mediation within the NMSSM as a solution to the little hierarchy problem, showing it can accommodate the 125 GeV Higgs with low fine-tuning and promising collider signatures.

Contribution

It introduces a novel TeV scale mirage mediation scenario in the NMSSM that reduces fine-tuning and aligns with Higgs measurements, including suppressed singlet-doublet mixing.

Findings

Fine-tuning measures as low as 10% for 1.5 TeV gluino and 1 TeV stop.

Higgsino mass can reach 500 GeV without increasing fine-tuning.

Higgs couplings and prospects for detection at LHC and ILC are discussed.

Abstract

We propose that the TeV scale mirage mediation in the Next-to-Minimal Supersymmetric Standard Model (NMSSM) is a novel solution for the little hierarchy problem in supersymmetry. The 125 GeV Higgs boson can be accommodated with the new quartic coupling or the mixing with the singlet. The fine-tuning measures are estimated numerically and found as low as 10\% or below for $1.5$ TeV gluino and $1$ TeV stop. The higgsino can be as heavy as 500 GeV without deteriorating the fine-tuning. An undesirable singlet-doublet mixing in the Higgs sector is suppressed due to approximate scale symmetries. We investigate the couplings of the Higgs bosons and discuss the prospects for studying them at LHC and ILC.