ANAIS-112 sensitivity in the search for dark matter annual modulation

Coarasa, I.; Amaré, J.; Cebrián, S.; Cuesta, C.; Garcı́a, E.; Martínez, M.; Oliván, M. A.; Ortigoza, Y.; Solórzano, A. Ortíz de; Puimedón, J.; Salinas, A.; Sarsa, M.L.; Villar, P.; Villar, J.A.

doi:10.1140/epjc/s10052-019-6733-4

Cited by 44 publications

(58 citation statements)

References 35 publications

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“…We quote our sensitivity to DAMA/LIBRA as the ratio of DAMA modulation result over the standard deviation on the modulation amplitude derived from ANAIS-112 data (S DAM A m /σ(S m )). Results from two-year data of ANAIS-112 confirm our sensitivity prospects [19], being at present at 2σ level, and supporting our goal of reaching 3σ in 5 years of data taking (see Figure 3).…”

Section: Annual Modulation Analysis and Resultssupporting

confidence: 81%

“…After the first year of data taking we unblinded 10% of those events, chosen randomly distributed days along the data taking, for fine tuning the events rejection procedures and carry-out general background assessment and sensitivity estimates. All of this information was published [17,18,19]. After 1.5 years, using the designed analysis protocol, the unblinding of the ROI and annual modulation analysis allowed the confirmation of the sensitivity projections, while producing some tension with DAMA/LIBRA annual modulation result [20].…”

Section: Annual Modulation Analysis and Resultsmentioning

confidence: 99%

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ANAIS-112 status: two years results on annual modulation

Amaré

Cebrián

Cintas

et al. 2020

J. Phys.: Conf. Ser.

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ANAIS (Annual modulation with NaI Scintillators) is a dark matter direct detection experiment located at the Canfranc Underground Laboratory (LSC), in Spain. The goal is to confirm or refute in a model independent way the DAMA/LIBRA positive result: an annual modulation in the low-energy detection rate compatible with the expected signal induced by dark matter particles in the galactic halo. This signal, observed for about 20 years, is in strong tension with the negative results of other very sensitive experiments, but a direct comparison using the same target material, NaI(Tl), was still lacking. ANAIS-112, consisting of 112.5 kg of NaI(Tl) scintillators, is taking data at the LSC since August 2017. Here we present the preliminary annual modulation analysis corresponding to two years of data (exposure of 220.69 kg×y) and the ANAIS-112 projected sensitivity for the scheduled 5 y of operation.

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Section: Annual Modulation Analysis and Resultssupporting

confidence: 81%

Section: Annual Modulation Analysis and Resultsmentioning

confidence: 99%

ANAIS-112 status: two years results on annual modulation

Amaré

Cebrián

Cintas

et al. 2020

J. Phys.: Conf. Ser.

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“…The dark matter run is underway since August 2017, with an outstanding light collection of ∼15 phe/keV for all modules allowing an energy threshold at 1 keV ee . Before any analysis, the sensitivity from the measured background in 1-6 keV ee was evaluated, confirming the possibility to explore the 3σ DAMA/LIBRA region in 5 years [21]. The first results on annual modulation for the first 1.5 years of data and exposure of 157.55 kg·y have been published [22]; updated results for 2 years were presented at TAUP2019, being the best fit modulation amplitudes derived for the 2-6 keV ee region S m = (−0.0029 ± 0.0050) cpd/kg/keV and for the 1-6 keV ee region S m = (−0.0036 ± 0.0054) cpd/kg/keV, incompatible at 2.6σ with DAMA/LIBRA results [23].…”

Section: Annual Modulationmentioning

confidence: 84%

Small scale direct dark matter search experiments

Cebrián

2020

J. Phys.: Conf. Ser.

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Experiments based on noble liquids and solid state cryogenic detectors have had a leading role in the direct detection of dark matter. But smaller scale projects can help to explore the new dark matter landscape with advanced, ultra-sensitive detectors based on recently developed technologies. Here, the physics case of different types of small scale dark matter experiments will be presented and many of them will be reviewed, highlighting the detection techniques and summarizing their properties, results and status.

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“…The DAMA/LIBRA signal is an annual modulation effect while the COSINE-100 result is based on the time averaged spectral shape [34]. Although the first modulation measurements from ANAIS-112 [35] and COSINE-100 [36] were recently released, both experiments still need a few more years of exposure to reach a modulation sensitivity that is sufficient to probe the DAMA/LIBRA signal directly [25,27].…”

Section: Introductionmentioning

confidence: 99%

Comparison between DAMA/LIBRA and COSINE-100 in the light of quenching factors

Adhikari

et al. 2019

J. Cosmol. Astropart. Phys.

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There is a long standing debate about whether or not the annual modulation signal reported by the DAMA/LIBRA collaboration is induced by Weakly Interacting Massive Particles (WIMP) in the galaxy's dark matter halo scattering from nuclides in their NaI(Tl) crystal target/detector. This is because regions of WIMP-mass vs. WIMP-nucleon crosssection parameter space that can accommodate the DAMA/LIBRA-phase1 modulation signal in the context of the standard WIMP dark matter galactic halo and isospin-conserving (canonical), spin-independent (SI) WIMP-nucleon interactions have been excluded by many of other dark matter search experiments including COSINE-100, which uses the same NaI(Tl) target/detector material. Moreover, the recently released DAMA/LIBRA-phase2 results are inconsistent with an interpretation as WIMP-nuclide scattering via the canonical SI interaction and prefer, instead, isospin-violating or spin-dependent interactions. Dark matter interpretations of the DAMA/LIBRA signal are sensitive to the NaI(Tl) scintillation efficiency for nuclear recoils, which is characterized by so-called quenching factors (QF), and the QF values used in previous studies differ significantly from recently reported measurements, which may have led to incorrect interpretations of the DAMA/LIBRA signal. In this article, the compatibility of the DAMA/LIBRA and COSINE-100 results, in light of the new QF measurements is examined for different possible types of WIMP-nucleon interactions. The resulting allowed parameter space regions associated with the DAMA/LIBRA signal are explicitly compared with 90% confidence level upper limits from the initial 59.5 day COSINE-100 exposure. With the newly measured QF values, the allowed 3σ regions from the DAMA/LIBRA data are still generally excluded by the COSINE-100 data.

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ANAIS-112 sensitivity in the search for dark matter annual modulation

Cited by 44 publications

References 35 publications

ANAIS-112 status: two years results on annual modulation

ANAIS-112 status: two years results on annual modulation

Small scale direct dark matter search experiments

Comparison between DAMA/LIBRA and COSINE-100 in the light of quenching factors

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