Discovery potential of multiton xenon detectors in neutrino electromagnetic properties

Hsieh, Chung-Chun; Singh, L.; Wu, Chih-Pan; Chen, Jiunn-Wei; Chi, Hsin-Chang; Liu, C.-P.; Pandey, Mukesh Kumar; Wong, H. T.

doi:10.1103/physrevd.100.073001

Cited by 26 publications

(17 citation statements)

References 69 publications

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“…(11) and applying a step-function approximation to account for the electron binding energies. In the energy range considered here, this approximation agrees well with more detailed calculations [47]. Note that this signal would be added to the SM neutrino elastic scattering spectrum, which we treat as a background as described in Sec.…”

Section: B Neutrino Magnetic Momentsupporting

confidence: 86%

Excess electronic recoil events in XENON1T

Aprile¹,

Aalbers²,

Agostini³

et al. 2020

Phys. Rev. D

556

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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Section: B Neutrino Magnetic Momentsupporting

confidence: 86%

Excess electronic recoil events in XENON1T

Aprile¹,

Aalbers²,

Agostini³

et al. 2020

Phys. Rev. D

556

745

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show abstract

“…[56,68]. It is remarkable that the low-energy pp neutrinos make up more than 90% of the total solar neutrino fluxes [70,132], but such neutrinos have very low energies, which only cover the range below 420 keV [64,132,133]. Our calculation shows that the pp neutrinos make the largest contribution (∼ 53.14%) to νn →νn reactions because of its relatively higher intensity.…”

Section: A (B − L) Is Conservedmentioning

confidence: 72%

Connection between νn→ν¯n¯ reactions and n−
Hao
¹

2020
Phys. Rev. D
3
0
1
0
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In this work, we investigate the connection and compatibility between νn →νn reactions and n-n oscillations based on the SU (3)c×SU (2)L×U (1) symmetry model with additional Higgs triplets. We explore the possibility that the scattering process νn →νn produced by low-energy solar neutrinos gives rise to an unavoidable background in the measurements of n-n oscillations. We focus on two different scenarios, depending on whether the (B − L) symmetry could be broken. We analyze the interplay of the various constraints on the two processes and their observable consequences. In the scenario where both (B + L) and (B − L) could be broken, we point out that if all the requirements, mainly arising from the type-II seesaw mechanism, are satisfied, the parameter space would be severely constrained. In this case, although the masses of the Higgs triplet bosons could be within the reach of a direct detection at the LHC or future high-energy experiments, the predicted n-n oscillation times would be completely beyond the detectable regions of the present experiments. In both scenarios, the present experiments are unable to distinguish a νn →νn reaction event from a n-n oscillation event within the accessible energy range. Nevertheless, if any of the two processes is detected, there could be signal associated with new physics beyond the Standard Model.

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“…(42) is used to set an upper bound here [130,131]. This approximation is consistent with more robust calculations involving the internal structure of the XENON nucleus [137]. Meanwhile, we use the data from ref.…”

Section: Incoming Sterile Neutrinomentioning

confidence: 86%

Shedding new light on sterile neutrinos from XENON1T experiment

Shakeri

Hajkarim

Xue

2020

J. High Energ. Phys.

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The XENON1T collaboration recently reported the excess of events from recoil electrons, possibly giving an insight into new area beyond the Standard Model (SM) of particle physics. We try to explain this excess by considering effective interactions between the sterile neutrinos and the SM particles. In this paper, we present an effective model based on one-particle-irreducible interaction vertices at low energies that are induced from the SM gauge symmetric four-fermion operators at high energies. The effective interaction strength is constrained by the SM precision measurements, astrophysical and cosmological observations. We introduce a novel effective electromagnetic interaction between sterile neutrinos and SM neutrinos, which can successfully explain the XENON1T event rate through inelastic scattering of the sterile neutrino dark matter from Xenon electrons. We find that sterile neutrinos with masses around 90 keV and specific effective coupling can fit well with the XENON1T data where the best fit points preserving DM constraints and possibly describe the anomalies in other experiments.

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Discovery potential of multiton xenon detectors in neutrino electromagnetic properties

Cited by 26 publications

References 69 publications

Excess electronic recoil events in XENON1T

Excess electronic recoil events in XENON1T

Connection between νn→ν¯n¯ reactions and n−
Hao
¹

2020
Phys. Rev. D
3
0
1
0
View full text Add to dashboard Cite

Shedding new light on sterile neutrinos from XENON1T experiment

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Discovery potential of multiton xenon detectors in neutrino electromagnetic properties

Cited by 26 publications

References 69 publications

Excess electronic recoil events in XENON1T

Excess electronic recoil events in XENON1T

Connection between νn→ν¯n¯ reactions and n−Hao1 2020Phys. Rev. D3010View full textAdd to dashboardCite

Shedding new light on sterile neutrinos from XENON1T experiment

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About

Connection between νn→ν¯n¯ reactions and n−
Hao
¹

2020
Phys. Rev. D
3
0
1
0
View full text Add to dashboard Cite