Low-energy probes of sterile neutrino transition magnetic moments

Abstract

Sterile neutrinos with keV-MeV masses and non-zero transition magnetic moments can be probed through low-energy nuclear or electron recoil measurements. Here we determine the sensitivities of current and future searches, showing how they can probe a previously unexplored parameter region. Future coherent elastic neutrino-nucleus scattering (CEνNS) or elastic neutrino-electron scattering (EνES) experiments using a monochromatic 51 Cr source can fully probe the region indicated by the recent XENON1T excess.

Probing Active-Sterile Neutrino Transition Magnetic Moments with Photon Emission from CE$ν$NS

“…We note that our limit derived for the Primakoff upscattering mode from the COHERENT experiment is in good agreement with the limits reported in Ref. [31].…”

Probing neutrino magnetic moments and the XENON1T excess with coherent elastic solar neutrino scattering

“…A weighted average have been performed according to the natural abundance of isotopes in detector material. The allowed region from the Xenon1T excess [66], and the present experimental constraints from Borexino [16], TEXONO [112,113] and the ν s → νγ decay sensitivity from Borexino and Super Kamiokande [78] are shown for comparison. consideration with corresponding weighted average.…”

“…are illustrated as colored bands. Meanwhile the constraints from the combined analysis of COHERENT Ar and CsI data [17], from Borexino [16], ν s → νγ [78], TEXONO [112,113] are also shown for comparison.…”

“…Future experimental scenarios provide significantly more stringent constraints and liquid noble gas based and low threshold solid based experiments are capable of the µ ν l limit to the O(10 • It is shown in Figure 3 that the CEνNS detection in DD experiments provide excellent constraints on the ν s MM model, and both next generation and future experimental scenarios can exclude the parameter space from the Xenon1T excess [66]. Meanwhile, constraints from these experiments are significantly better than present experimental constraints from Borexino [16], TEXONO [112,113] and the ν s → νγ decay sensitivity from Borexino and Super Kamiokande [78]. Note that there are several sudden changes in the sensitivity curves of silicon-based experiments and future germanium-based experiments, which are resulted from the appearance of different low energy solar neutrino fluxes.…”

CE$ν$NS as a probe of flavored generalized neutrino interactions

“…Since the COHERENT collaboration announced the first measurement of CEνNS with their CENNS-10 detector, several studies have been performed in order to extract information from this measurement, like the value of the weak mixing angle, limits for some BSM scenarios such as new light vector and scalar mediators, sterile neutrino transition magnetic moments, or even WIMP discovery limits, just to mention a few [28,39,[52][53][54][55][56]. This can be achieved by means of a χ 2 analysis of the experimental data provided by the COHERENT collaboration.…”