# First results on dark matter annual modulation from ANAIS-112 experiment

## TL;DR

The ANAIS-112 experiment analyzed 1.5 years of data to test the DAMA/LIBRA dark matter modulation claim, finding results consistent with no modulation and supporting future sensitivity goals.

## Contribution

First experimental results from ANAIS-112 testing the DAMA/LIBRA modulation claim with null results over 1.5 years.

## Key findings

- Data are consistent with the null hypothesis of no modulation.
- Best fits show no significant modulation signal.
- Results support the projected 3σ sensitivity in 5 years.

## Abstract

ANAIS is a direct detection dark matter experiment aiming at the testing of the DAMA/LIBRA annual modulation result, which standing for about two decades has neither been confirmed nor ruled out by any other experiment in a model independent way. ANAIS-112, consisting of 112.5 kg of sodium iodide crystals, is taking data at the Canfranc Underground Laboratory, Spain, since August 2017. This letter presents the annual modulation analysis of 1.5 years of data, amounting to 157.55 kg$\times$y. We focus on the model independent analysis searching for modulation and the validation of our sensitivity prospects. ANAIS-112 data are consistent with the null hypothesis (p-values of 0.65 and 0.16 for [2-6] and [1-6] keV energy regions, respectively). The best fits for the modulation hypothesis are consistent with the absence of modulation ($S_m$=-0.0044$\pm$0.0058 cpd/kg/keV and -0.0015$\pm$0.0063 cpd/kg/keV, respectively). They are in agreement with our estimated sensitivity for the accumulated exposure, supporting our projected goal of reaching a 3$\sigma$ sensitivity to the DAMA/LIBRA result in 5 years of data taking.