XENON1T takes a razor to a dark E6-inspired model

Abstract

Motivated by the recent result of XENON1T collaboration with full exposure, 279 life days, that sets the most stringent limit on the spin-independent dark matter-nucleon scattering cross section we discuss a dark E6-inspired model that features the presence of a U (1) d−u gauge symmetry. The dark matter candidate is a Dirac fermion that interacts with Standard Model fermions via a massive Z that preserves the quantum number assignments of this symmetry. We compute the spin-independent scattering cross section off xenon nucleus and compare with the XENON1T limit; find the LHC bound on the Z mass as well as the projection sensitivity of high-energy and luminosity LHC; and derive the Fermi-LAT bounds on the dark matter annihilation cross section based on the observation of gamma-rays in the direction of Dwarf Spheroidal galaxies. We exploit the complementarity between these datasets to conclude that the new bound from XENON1T severely constrain the model, which combined with the LHC upgrade sensitivity rules out this WIMP realization setup below 5 TeV.

A two Higgs doublet model for dark matter and neutrino masses

“…Moreover, the scalar doublets are charged under B − L, so they will introduce additional interactions involving the Z boson. For these reasons our results can differ from those obtained in studies involving simplified models [55][56][57][58][59].…”

Discovering heavy U(1)-gauged Higgs bosons at the HL-LHC

“…Its dependence on v s is shown in figure 4 for different values of the new gauge goupling g B−L . We choose g B−L = 0.1 in accordance with the latest LHC limits [52].…”

Z′ mediated WIMPs: dead, dying, or soon to be detected?

“…However, since the U(1) R charges of the SM up and down quarks are flipped, it is not possible in this scenario to generate purely axial interactions to either protons or neutrons, and therefore direct detections constraints will still be very restrictive (see also, refs. [233][234][235][236][237]).…”