Implications of the first detection of coherent elastic neutrino-nucleus scattering (CEvNS) with liquid Argon

Abstract

The CENNS-10 experiment of the COHERENT collaboration has recently reported the first detection of coherent-elastic neutrino-nucleus scattering (CEvNS) in liquid Argon with more than 3σ significance. In this work, we exploit the new data in order to probe various interesting parameters which are of key importance to CEvNS within and beyond the Standard Model. A dedicated statistical analysis of these data shows that the current constraints are significantly improved in most cases. We derive a first measurement of the neutron rms charge radius of Argon, and also an improved determination of the weak mixing angle in the low energy regime. We also update the constraints on neutrino non-standard interactions, electromagnetic properties and light mediators with respect to those derived from the first COHERENT-CsI data.

Constraints on light vector mediators through coherent elastic neutrino nucleus scattering data from COHERENT

“…Our limits for the B − L Z model are similar to those obtained in ref. [76], that have been derived using only the total number of events. In particular, it is difficult to compare our analysis of the COHERENT Ar dataset with that in ref.…”

“…In particular, it is difficult to compare our analysis of the COHERENT Ar dataset with that in ref. [76], that used the fitted number of CEνNS events derived by the COHERENT Collaboration [17] instead of the experimental data.…”

Physics results from the first COHERENT observation of coherent elastic neutrino-nucleus scattering in argon and their combination with cesium-iodide data

“…The observation of CEνNS scattering in argon can be used to probe the nuclear neutron distribution [3,4,16,19,50]. We fitted the COHERENT data in order to determine the neutron rms radius R n of Ar, considering for R n the lower bound in Eq.…”

“…During the completion of this work, another analysis of this type appeared on arXiv [16], but the results are not comparable with ours because we fit the COHERENT Ar data, whereas the analysis of Ref. [16] is not a fit of the COHERENT Ar data, but a fit of the number of CEνNS events obtained by the COHERENT Collaboration from the fit of the data [13]. Such an indirect analysis underestimates the systematic uncertainties, especially those due to the background that are not taken into account.…”

Determining the nuclear neutron distribution from Coherent Elastic neutrino-Nucleus Scattering: current results and future prospects

“…A non-exhaustive list of BSM topics covered includes bounds on non-standard neutrino interactions (NSI) [5][6][7][8][9][10][11][12][13][14][15][16][17][18], constraints on JHEP08(2020)030 neutrino electromagnetic properties [19][20][21][22][23], sterile neutrino searches [24,25], or searches for new weakly-interacting particles from a hidden sector [26][27][28]. On the other hand, standard physics studies include new constraints on the weak mixing angle [29][30][31] at very low momentum transfer, as well as studies of the nuclear structure factors of the target nuclei [32][33][34][35][36][37][38][39][40][41].…”