Implication of neutrino backgrounds on the reach of next generation dark matter direct detection experiments

TL;DR

This paper examines how neutrino backgrounds impact the ability of next-generation dark matter detectors to identify WIMPs, highlighting sensitivity loss at certain mass ranges and cross sections due to neutrino interference.

Contribution

It provides a detailed analysis of neutrino backgrounds' effects on WIMP detection sensitivity across a wide mass range, considering uncertainties in neutrino fluxes.

Findings

Neutrino backgrounds significantly limit detection sensitivity for light (~10 GeV) WIMPs.

Neutrino backgrounds significantly limit detection sensitivity for heavy (~100 GeV) WIMPs.

Sensitivity loss occurs below specific cross section thresholds due to neutrino interference.

Abstract

As direct dark matter experiments continue to increase in size, they will become sensitive to neutrinos from astrophysical sources. For experiments that do not have directional sensitivity, coherent neutrino scattering (CNS) from several sources represents an important background to understand, as it can almost perfectly mimic an authentic WIMP signal. Here we explore in detail the effect of neutrino backgrounds on the discovery potential of WIMPs over the entire mass range of 500 MeV to 10 TeV. We show that, given the theoretical and measured uncertainties on the neutrino backgrounds, direct detection experiments lose sensitivity to light (~10 GeV) and heavy (~100 GeV) WIMPs with a spin-independent cross section below 10^{-45} cm^2 and 10^{-49} cm^2, respectively.