Abstract
We present the results of a systematic study of the constraints on neutrino neutral-current non-standard interactions (NSI) that can be obtained from the analysis of the COHERENT spectral and temporal data. First, we consider the general case in which all the ten relevant neutral-current NSI parameters are considered as free. We show that they are very weakly constrained by the COHERENT data because of possible cancellations between the up and down quark contributions. However, the up-down average parameters are relatively well constrained and the strongest constraints are obtained for an appropriate linear combination of up and down NSI parameters. We also consider the case in which there are only NSI with either up or down quarks, and we show that the LMA-Dark fit of solar neutrino data is excluded at $5.6\sigma$ and $7.2\sigma$ respectively, for NSI with up and down quark. We finally present the tight constraints that can be obtained on each NSI parameter if it is the dominant one, assuming that the effects of the others are negligible.
Highlights
Coherent elastic neutrino-nucleus scattering (CEνNS) has been observed recently for the first time in the COHERENT experiment [1], many years after its prediction [2,3,4]
We discuss only the constraints on vector neutral-current nonstandard interactions (NSIs) that can be obtained from the analysis of the COHERENT CEνNS data
We performed a systematic study of the constraints on neutrino neutral-current nonstandard interactions that can be obtained from the analysis of the COHERENT spectral and temporal data
Summary
Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Torino, Via P. Giuria 1, I–10125 Torino, Italy (Received 6 September 2019; revised manuscript received 7 January 2020; accepted 6 February 2020; published 27 February 2020). We present the results of a systematic study of the constraints on neutrino neutral-current nonstandard interactions (NSIs) that can be obtained from the analysis of the COHERENT spectral and temporal data. We consider the general case in which all ten relevant neutral-current NSI parameters are considered as free. We show that they are very weakly constrained by the COHERENT data because of possible cancellations between the up and down quark contributions. We present the tight constraints that can be obtained on each NSI parameter if it is the dominant one, assuming that the effects of the others are negligible
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