COHERENT constraints after the COHERENT-2020 quenching factor measurement

Recently, an improved quenching factor (QF) measurement for low-energy nuclear recoils in CsI[Na] has been reported by the COHERENT Collaboration. The new energy-dependent QF is characterized by a reduced systematic uncertainty and leads to a better agreement between the experimental COHERENT data and the Standard Model (SM) expectation. In this work, we report updated constraints on parameters that describe the process of coherent elastic neutrino-nucleus scattering within and beyond the SM, and we also present how the new QF affects their interpretation.

Figure 1

Comparison of the expected number of events at the COHERENT CsI detector for the old vs the new QF measurement.

Figure 2

${\chi }^2$ profiles for the cases of the weak mixing angle (left) and the average nuclear rms radius of CsI (right) extracted from the analysis of the COHERENT data for the old vs the new QF measurement.

Figure 3

${\chi }^2$ profiles for the NU NSIs from the analysis of the COHERENT data. A comparison of the obtained sensitivity using the old vs the new QF is also shown.

Figure 4

Allowed regions in the NU NSIs parameter space obtained from the analysis of the COHERENT data for the old vs the new QF measurement.

Figure 5

${\chi }^2$ profiles of the effective neutrino magnetic moment extracted by the COHERENT data for the old vs the new QF measurement.

Figure 6

${\chi }^2$ profiles of the relevant neutrino charge radii at the COHERENT experiment for the old (left) and the new (right) QF measurement.

Figure 7

Contours in the neutrino charge radius parameter space from the analysis of the COHERENT data. The results are shown for various combinations in the $(⟨r_{{\nu }_{\alpha }}^2⟩,⟨r_{{\nu }_{\beta }}^2⟩)$ plane and compared for the old vs the new QF measurement.

Figure 8

Exclusion curves in the $(g_{Z^{\prime }}^2,M_{Z^{\prime }})$ parameter space (left) and in the $(g_{\varphi }^2,M_{\varphi })$ parameter space (right) from the analysis of the COHERENT data. The results are shown for the old and the new QF measurement.