Fig. 3: Fit results for data from the nine ANAIS–112 modules in the [1–6] keV energy range, under both the modulation and null hypotheses. | Communications Physics

Fig. 3: Fit results for data from the nine ANAIS–112 modules in the [1–6] keV energy range, under both the modulation and null hypotheses.

From: ANAIS–112 three years data: a sensitive model independent negative test of the DAMA/LIBRA dark matter signal

Fig. 3

Each panel corresponds to one of the nine detectors of ANAIS–112. The error bars on the data points represent the standard deviation of the observed rate of events combined with the efficiency uncertainty. The blue line shows the result of the modulation hypothesis fit, while the red line represents the result of the null hypothesis, although it is generally masked by the blue line and not visible. Each panel also displays the χ2 divided by the degrees of freedom (NDF) of the fit for each detector, along with the corresponding p-value. The global results of the fit are: for the null hypothesis, χ2/NDF = 982.20/972, corresponding to a p-value = 0.403, and for the modulation hypothesis, χ2/NDF = 982.07/971, corresponding to a p-value = 0.395. The best-fit modulation amplitude in the latter case is Sm = (−1.3 ± 3.7) (counts keV−1 ton−1 day−1).

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