Implications of dark sector mixing on leptophilic scalar dark matter

Abstract

We propose a new viable outlook to the mixing between a singlet and a doublet leptonic dark sector fields. This choice relaxes the dark matter (DM) search constraints on the quintessential scalar singlet DM as well as presents new opportunities for its detection in the lab. The mixing produces an arbitrary mass difference between the two components of the extra doublet in a gauge-invariant way, without introducing any new scale of electroweak symmetry breaking in the theory. It also provides a useful handle to distinguish between the dark sector particles of different isospins, which is a challenging task otherwise. As the dark leptons coannihilate non-trivially, the mixing effectively enhances the viable parameter space for the relic density constraint. In low DM mass regime, our analysis shows that with a non-zero mixing, it is possible to relax the existing indirect search bounds on the upper limit of the DM-Standard Model coupling. From the analysis of the $3\tau +E_T^{miss}$ and $\ell \tau +E_T^{miss}$ channels for LHC at $\sqrt{s}=13$ TeV, we show that one ensures the presence of the mixing parameter between the dark sector particles of the theory by looking at the peak and tail positions of the kinematic distributions. Even with a tweak in the values of other free parameters within the viable parameter region, the distinct peak and tail positions of the kinematic distributions remains a constant feature of the model. While both the channels present us the opportunity to detect the mixing signature at the LHC/HL-LHC, the former gives better results in terms of a larger region of mixing parameter. From the fiducial cross section, the projected statistical significance for the integrated luminosity, $\mathcal{L}=3{\text{ab}}^{-1}$, are shown for a combined parameter region obeying all the existing constraints, where there is the best possibility to detect such a signature.

arXiv comment20 pages, 12 captioned figures, matches published version in JHEP

References in corpus (43)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• Particle Dark Matter: Evidence, Candidates and Constraints
• FastJet user manual
• Dark Matter Candidates from Particle Physics and Methods of Detection
• Minimal Dark Matter
• Gauge Singlet Scalars as Cold Dark Matter
• The Minimal Model of Nonbaryonic Dark Matter: A Singlet Scalar
• Non-Baryonic Dark Matter - Observational Evidence and Detection Methods
• MadAnalysis 5, a user-friendly framework for collider phenomenology
• The Well-Tempered Neutralino
• Neutralino-Stau Coannihilation and the Cosmological Upper Limit on the Mass of the Lightest Supersymmetric Particle
• Global fit to Higgs signal strengths and couplings and implications for extended Higgs sectors
• Dark Matter through the Higgs portal
• Prospects and Blind Spots for Neutralino Dark Matter
• Singlet-Doublet Dark Matter
• Simplified Models of Mixed Dark Matter
• $Z_3$ Scalar Singlet Dark Matter
• Two-Component Dark Matter
• The Leptonic Higgs Portal
• WIMP Dark Matter in a Well-Tempered Regime: A case study on Singlet-Doublets Fermionic WIMP
• Mitigating Direct Detection Bounds in Non-minimal Higgs Portal Scalar Dark Matter Models
• The End of the CMSSM Coannihilation Strip is Nigh
• Naturally Small Dirac Neutrino Mass with Intermediate $SU(2{)}_L$ Multiplet Fields
• Two Component Higgs-Portal Dark Matter
• Minimal Vector-like leptonic Dark Matter and Signatures at the LHC
• Is well-tempered neutralino in MSSM still alive after 2016 LUX results?
• Singlet-Doublet Dirac Dark Matter
• Simplified models of dark matter with a long-lived co-annihilation partner
• Leptonic WIMP Coannihilation and the Current Dark Matter Search Strategy
• Closing in on the Tip of the CMSSM Stau Coannihilation Strip
• Stau relic density at the Big-Bang nucleosynthesis era consistent with the abundance of the light element nuclei in the coannihilation scenario
• Anomalous Higgs Couplings as a Window to New Physics
• Using Tau Polarization to probe the Stau Co-annihilation Region of mSUGRA Model at LHC
• Unifying the flavor origin of dark matter with leptonic nonzero ${\theta }_{13}$
• Singlet-Doublet Dirac Dark Matter and Neutrino Masses
• Potential discovery of staus through heavy Higgs boson decays at the LHC
• Scalar Dark Matter in Leptophilic Two-Higgs-Doublet Model
• Investigating Unitarity in Presence of Anomalous Couplings
• A light scalar dark matter extension of the type-II two-Higgs-doublet model
• Scattering unitarity with effective dimension-6 operators
• Multilepton signatures for scalar dark matter searches in coannihilation scenario

Cited by in corpus (5)

• EFT analysis of leptophilic dark matter at future electron-positron colliders in the mono-photon and mono-$Z$ channels
• New Physics Search at the CEPC: a General Perspective
• Neutrinos from the Sun can discover dark matter-electron scattering
• Dark Matter candidates in a Type-II radiative neutrino mass model
• Search for sub-GeV Scalars in $e^{+}{e}^{-}$ collisions