Abstract
New measurements of the coherent elastic neutrino-nucleus scattering (CEvNS) are expected to be achieved in the near future by using two neutrino production channels with different energy distributions: the very low energy electron antineutrinos from reactor sources and the muon and electron neutrinos from spallation neutron sources (SNS) with a relatively higher energy. Although precise measurements of this reaction would allow an improved knowledge of standard and beyond the Standard Model physics, it is important to distinguish the different new contributions to the process. We illustrate this idea by constraining the average neutron root mean square (rms) radius of the scattering material, as a standard physics parameter, together with the nonstandard interactions (NSI) contribution as the new physics formalism. We show that the combination of experiments with different neutrino energy ranges could give place to more robust constraints on these parameters as long as the systematic errors are under control.
Highlights
Four decades after its theoretical prediction [1], the COHERENT Collaboration [2] has eventually accomplished the challenge of first observing the coherent elastic neutrino-nucleus scattering (CEvNS) phenomenon
We illustrate this idea by constraining the average neutron root mean square radius of the scattering material, as a standard physics parameter, together with the nonstandard interactions (NSI) contribution as the new physics formalism
In this work, we simultaneously study the potential to measure the relevant parameter for the nuclear form factor and the restriction to new physics in the nonstandard interactions (NSI) formalism, a model independent picture able to describe many beyond Standard Model scenarios for neutrino interactions [44,45,46,47]
Summary
Four decades after its theoretical prediction [1], the COHERENT Collaboration [2] has eventually accomplished the challenge of first observing the coherent elastic neutrino-nucleus scattering (CEvNS) phenomenon This measurement was achieved with neutrinos coming from a spallation neutron source (SNS) with energies up to 52.8 MeV. Many experiments under commission are in the quest for the first detection of CEvNS using reactor neutrinos as a source; among them we have TEXONO [31], CONUS [32], NU-CLEUS [33], CONNIE [34,35,36,37,38], MINER [39], RED100 [40], and RICOCHET [41] Because of their different characteristics, it can be expected that the combination of CEvNS from a reactor and SNS fluxes can accurately constrain standard and nonstandard physics. NSI have been extensively studied in the context of CEvNS [12,13,15,25,26,48,49,50], and its current constraints are already useful for global analysis [51,52,53,54], specially to break some of the well-known degeneracy problems leading to the LMA-dark solution [55,56] and to the possible degeneracy in probing CP violation in neutrino oscillations [57,58]
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