Abstract
We classify new physics signals in coherent elastic neutrino-nucleus scattering (CEνNS) processes induced by 8B solar neutrinos in multi-ton xenon dark matter (DM) detectors. Our analysis focuses on vector and scalar interactions in the effective and light mediator limits after considering the constraints emerging from the recent COHERENT data and neutrino masses. In both cases we identify a region where measurements of the event spectrum alone suffice to establish whether the new physics signal is related with vector or scalar couplings. We identify as well a region where measurements of the recoil spectrum are required so to establish the nature of the new interaction, and categorize the spectral features that enable distinguishing the vector from the scalar case. We demonstrate that measurements of the isospin nature of the new interaction and thereby removal of isospin related degeneracies are possible by combining independent measurements from two different detectors. We also comment on the status of searches for vector and scalar interactions for on-going multi-ton year xenon experiments.
Highlights
Measurements of the CEνNS process in dark matter (DM) detectors will provide complementary information to that arising from dedicated CEνNS experiments such as COHERENT [9, 10], CONNIE [11], CONUS [12] and ν-cleus [13]
Our analysis focuses on vector and scalar interactions in the effective and light mediator limits after considering the constraints emerging from the recent COHERENT data and neutrino masses
In this paper we studied the sensitivity of multi-ton DM experiments to distinguish vector and scalar new physics signals, through measurements of CEνNS processes induced by 8B neutrinos
Summary
Where in the scalar case lepton number conserving (LNC) couplings require the presence of right handed neutrinos. Note that here we have assumed the same nuclear form factor for protons and neutrons Such a choice is accurate provided one assumes the root-mean-square (rms) radii of the neutron and proton distributions are equal. The neutrino-nucleus vector couplings CVN and gV (SM contribution) as well as the neutrino-nucleus scalar parameter are obtained by going from the quark to the nucleus operators. They are written as [18]. Note that the new physics couplings in (2.5) reduce to effective couplings for m2X 4Eν2 (X = V, S), which for Eν 100 MeV — as required by coherence of the neutrino-nucleus elastic scattering process — means that for mX 103 MeV CEνNS induced by the interactions in (2.1) and (2.2) is well described by the four-point contact interactions studied in refs.
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