A low-mass dark matter project, ALETHEIA: A Liquid hElium Time projection cHambEr In dArk matter

Liao, J.; Gao, Y.; Liang, Zhuo; Peng, Zhaohua; Zhang, Lifeng; Zhang, Lei

doi:10.48550/arxiv.2103.02161

Cited by 4 publications

(3 citation statements)

References 51 publications

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“…Finally, other prospects to use He and Ne media at low temperatures for dark matter and neutrino detectors should also be mentioned [47,48,49,50].…”

Section: El Spectra and Yieldsmentioning

confidence: 99%

Neutral bremsstrahlung and excimer electroluminescence in noble gases and its relevance to two-phase dark matter detectors

Borisova,

Buzulutskov

2021

Preprint

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Proportional electroluminescence (EL) is the physical effect used in two-phase detectors for dark matter searches, to optically record (in the gas phase) the ionization signal produced by particle scattering in the liquid phase. In our previous work the presence of a new EL mechanism, namely that of neutral bremsstrahlung (NBrS), was demonstrated in two-phase argon detectors both theoretically and experimentally, in addition to the ordinary EL mechanism due to excimer emission. In this work the similar theoretical approach is applied to all noble gases, i.e. overall to helium, neon, argon, krypton and xenon, to calculate the EL yields and spectra both for NBrS and excimer EL. The relevance of the results obtained to the development of two-phase dark matter detectors is discussed.

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“…Finally, other prospects to use He and Ne media at low temperatures for dark matter and neutrino detectors should also be mentioned [47,48,49,50].…”

Section: El Spectra and Yieldsmentioning

confidence: 99%

Neutral bremsstrahlung and excimer electroluminescence in noble gases and its relevance to two-phase dark matter detectors

Borisova,

Buzulutskov

2021

Preprint

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“…and Ω n d h 2 = 10 −9 . This signal can be explored by the planning detection experiment searching for sub-GeV dark matter, called ALETHEIA [36].…”

Section: Estimator Of Unnaturalnessmentioning

confidence: 99%

QCD knows new quarks

Cui¹,

Ishida²,

Kawaguchi³

et al. 2021

Preprint

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We find new technical unnaturalness in the standard model, which is a big cancellation between the order parameters for the chiral SU (2) and U (1) axial symmetries related each other at the quantum level of QCD. This unnaturalness can be made technically natural if massless new quarks with a new chiral symmetry is present, which is insensitive to the chiral SU (2) symmetry for the lightest up and down quarks. Thus QCD without such a chiral symmetry is technical unnatural, being shown to be extremely off the defined natural-parameter space. Hypothetical massless quarks might simultaneously solve the strong CP problem, together with the new technical naturalness problem. As one viable candidate, we introduce a dark QCD model with massless new quarks, which can survive current experimental, cosmological, and astrophysical limits, and also leave various phenomenological and cosmological consequences, to be probed in the future. The new unnaturalness can be tested in lattice QCD, gives a new avenue to deeper understand QCD, and provides a new guideline to consider going beyond the standard model.

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“…Superfluid 4 He has been proposed for use in dark matter direct detection [1][2][3][4][5][6]. In particular, low-mass dark matter models have received substantial recent development and interest [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Scintillation yield from electronic and nuclear recoils in superfluid $^4$He

Biekert,

Chang,

Fink

et al. 2021

Preprint

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Superfluid 4 He is a promising target material for direct detection of light (< 1 GeV) dark matter. Possible signal channels available for readout in this medium include prompt photons, triplet excimers, and roton and phonon quasiparticles. The relative yield of these signals has implications for the sensitivity and discrimination power of a superfluid 4 He dark matter detector. Using a 16 cm 3 volume of 1.75 K superfluid 4 He read out by six immersed photomultiplier tubes, we measured the scintillation from electronic recoils ranging between 36.3 and 185 keVee, yielding a mean signal size of 1.12 +0.02 −0.03 phe/keVee, and nuclear recoils from 53.2 to 1090 keVnr. We compare the results of our relative scintillation yield measurements to an existing semi-empirical model based on helium-helium and electron-helium interaction cross sections. We also study the behavior of delayed scintillation components as a function of recoil type and energy, a further avenue for signal discrimination in superfluid 4 He.

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A low-mass dark matter project, ALETHEIA: A Liquid hElium Time projection cHambEr In dArk matter

Cited by 4 publications

References 51 publications

Neutral bremsstrahlung and excimer electroluminescence in noble gases and its relevance to two-phase dark matter detectors

Neutral bremsstrahlung and excimer electroluminescence in noble gases and its relevance to two-phase dark matter detectors

QCD knows new quarks

Scintillation yield from electronic and nuclear recoils in superfluid $^4$He

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