Study of Excess Electronic Recoil Events in XENON1T

Shockley, E.

doi:10.1007/978-3-030-87752-1

Cited by 6 publications

(12 citation statements)

References 118 publications

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“…In this brief note, we argue that hidden photons (also known as dark photons or paraphotons) that kinetically mix with the Standard Model photon may provide a simultaneous explanation for both of these observations: a single hidden photon with mass in the m X ∼ 2-3 keV range and a kinetic mixing ∼ 10 −15 connects the hidden photon dark matter interpretation of XENON1T [16,17,21] to the cooling excesses in HB stars [20].…”

Section: Introductionmentioning

confidence: 95%

“…Both effects make these particles amenable to experimental and observational tests. Intriguingly, experiments and observations of both systems have shown (small) excesses: XENON1T has recently reported a surplus of events in ∼ few × keV electronic recoils [16,17], and observations of horizontal branch (HB) stars favor the existence of an extra cooling mechanism [18][19][20]. While both of these could have other explanations such as a tritium component in XENON1T [16] or an insufficient understanding of the stellar physics (as well as the statistical significance not being very large), it is nevertheless interesting to speculate.…”

Section: Introductionmentioning

confidence: 99%

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Hidden Photon Dark Matter in the Light of XENON1T and Stellar Cooling

Alonso-Álvarez,

Ertas,

Jaeckel

et al. 2020

Preprint

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The low-energy electronic recoil spectrum in XENON1T provides an intriguing hint for potential new physics. At the same time, observations of horizontal branch stars favor the existence of a small amount of extra cooling compared to the one expected from the Standard Model particle content. In this note, we argue that a hidden photon with a mass of ∼ 2.8 keV and a kinetic mixing of ∼ 10 −15 allows for a good fit to both of these excesses. In this scenario, the signal detected in XENON1T is due to the absorption of hidden photon dark matter particles, whereas the anomalous cooling of horizontal branch stars arises from resonant production of hidden photons in the stellar interior.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Hidden Photon Dark Matter in the Light of XENON1T and Stellar Cooling

Alonso-Álvarez,

Ertas,

Jaeckel

et al. 2020

Preprint

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“…(Bottom) A different look at NEST: S2 vs. S1 for 10 6 37 Ar events. Color scale and black contours are both NEST's; red contours inner-/outer-most (arbitrary) contours of slide 68 of [19]. As raw data was marked as preliminary, not provided by XENON1T, only a qualitative comparison can be performed.…”

Section: Fig 7 Efficiencies Reported By Xenon1t In Their Figuresmentioning

confidence: 99%

“…If the excess is due to 37 Ar then we expect additional excess at low S2s due to the 0.27 keV peak from the 37 Ar , along with more events at high S2s due to the 2.82 keV peak. Our NEST simulation is compared to the XENON1T S2only cross-check [19] and it is shown in Fig. 9.…”

Section: Fig 7 Efficiencies Reported By Xenon1t In Their Figuresmentioning

confidence: 99%

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Investigating the XENON1T Low-Energy Electronic Recoil Excess Using NEST

Szydagis,

Levy,

Blockinger

et al. 2020

Preprint

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The search for dark matter, the missing mass of the universe, is one of the most active fields of study within particle physics. The XENON1T experiment recently observed a 3.5σ excess potentially consistent with dark matter, or with solar axions. Here, we utilize the Noble Element Simulation Technique (NEST) software to simulate the XENON1T detector, reproducing the excess. We present different detector efficiency and energy reconstruction models, but they primarily impact sub-keV energies and cannot explain the XENON1T excess. However, using NEST, we can reproduce their excess in multiple, unique ways, most easily via the addition of 31 ± 11 37 Ar decays. Furthermore, this results in new, modified background models, reducing the significance of the excess to only 1.5-2σ, at least with non-PLR methods. This is independent confirmation the excess is a real effect, but potentially explicable by known physics. Many cross-checks of our 37 Ar hypothesis are presented.

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Excess electronic recoil events in XENON1T

Aprile¹,

Aalbers²,

Agostini³

et al. 2020

Phys. Rev. D

548

745

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We report results from searches for new physics with low-energy electronic recoil data recorded with the XENON1T detector. With an exposure of 0.65 tonne-years and an unprecedentedly low background rate of 76 AE 2 stat events=ðtonne × year × keVÞ between 1 and 30 keV, the data enable one of the most sensitive searches for solar axions, an enhanced neutrino magnetic moment using solar neutrinos, and bosonic dark matter. An excess over known backgrounds is observed at low energies and most prominent between 2 and 3 keV. The solar axion model has a 3.4σ significance, and a three-dimensional 90% confidence surface is reported for axion couplings to electrons, photons, and nucleons. This surface is inscribed in the cuboid defined by g ae < 3.8 × 10 −12 , g ae g eff an < 4.8 × 10 −18 , and g ae g aγ < 7.7 × 10 −22 GeV −1 , and excludes either g ae ¼ 0 or g ae g aγ ¼ g ae g eff an ¼ 0. The neutrino magnetic moment signal is similarly favored over background at 3.2σ, and a confidence interval of μ ν ∈ ð1.4; 2.9Þ × 10 −11 μ B (90% C.L.) is reported. Both results are in strong tension with stellar constraints. The excess can also be explained by β decays of tritium at 3.2σ significance with a corresponding tritium concentration in xenon of ð6.2 AE 2.0Þ × 10 −25 mol=mol. Such a trace amount can neither be confirmed nor excluded with current knowledge of its production and reduction mechanisms. The significances of the solar axion and neutrino magnetic moment hypotheses are decreased to 2.0σ and 0.9σ, respectively, if an unconstrained tritium component is included in the fitting. With respect to bosonic dark matter, the excess favors a monoenergetic peak at ð2.3 AE 0.2Þ keV (68% C.L.) with a 3.0σ global (4.0σ local) significance over background. This analysis sets the most restrictive direct constraints to date on pseudoscalar and vector bosonic dark matter for most masses between 1 and 210 keV=c 2. We also consider the possibility that 37 Ar may be present in the detector, yielding a 2.82 keV peak from electron capture. Contrary to tritium, the 37 Ar concentration can be tightly constrained and is found to be negligible.

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Study of Excess Electronic Recoil Events in XENON1T

Cited by 6 publications

References 118 publications

Hidden Photon Dark Matter in the Light of XENON1T and Stellar Cooling

Hidden Photon Dark Matter in the Light of XENON1T and Stellar Cooling

Investigating the XENON1T Low-Energy Electronic Recoil Excess Using NEST

Excess electronic recoil events in XENON1T

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