First search for invisible decays of orthopositronium confined in a vacuum cavity

Vigo, Carlos; Gerchow, Lars; Liszkay, L.; Rubbia, A.

doi:10.1103/physrevd.97.092008

Cited by 18 publications

(20 citation statements)

References 52 publications

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“…5. The previous experimental constraint on ε comes from invisible decays of orthopositronium in a vacuum [26]. If positronium-mirror positronium mixing were to occur, decay to missing photons would leave a missing energy signal.…”

Section: Resultsmentioning

confidence: 99%

First direct detection constraint on mirror dark matter kinetic mixing using LUX 2013 data

Akerib¹,

Alsum²,

Araujo³

et al. 2020

Phys. Rev. D

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We present the results of a direct detection search for mirror dark matter interactions, using data collected from the Large Underground Xenon experiment during 2013, with an exposure of 95 live-days × 118 kg. Here, the calculations of the mirror electron scattering rate in liquid xenon take into account the shielding effects from mirror dark matter captured within the Earth. Annual and diurnal modulation of the dark matter flux and atomic shell effects in xenon are also accounted for. Having found no evidence for an electron recoil signal induced by mirror dark matter interactions we place an upper limit on the kinetic mixing parameter over a range of local mirror electron temperatures between 0.1 and 0.9 keV. This limit shows significant improvement over the previous experimental constraint from orthopositronium decays and significantly reduces the allowed parameter space for the model. We exclude mirror electron temperatures above 0.3 keV at a 90% confidence level, for this model, and constrain the kinetic mixing below this temperature.

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Section: Resultsmentioning

confidence: 99%

First direct detection constraint on mirror dark matter kinetic mixing using LUX 2013 data

Akerib¹,

Alsum²,

Araujo³

et al. 2020

Phys. Rev. D

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“…The search for invisible decays is a major focus for Ps decay experiments [21,22,23,24,25].The process allowed by SM that would mimic the new physics invisible decays has a experimentally negligible branching ratio Br(o-Ps → ν eνe ) < 10 −18 [26].…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The no-signal method was used in two independent measurements by the ETH Zürich group. They established the most accurate constraint on a possible invisible decay of oPs in vacuum [25] up to now 1 :…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The BR(o-PS → X) can be expressed as BR ≈ 1 N P s × X . The advantage of the short signals formed in the plastic scintillators (of the order of few ns) allows to significantly reduce the pile-up problems present in the previous experiments [25,29,45] and therefore to choose sources with higher activities. The estimate of the accidental coincidence rate together with the oPs production rate is shown in Fig.…”

Section: J-pet Prospectsmentioning

confidence: 99%

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Feasibility of Ortho-positronium Lifetime Studies with the J-PET Detector in Context of Mirror Matter Models

Krzemień¹,

Río²,

Kacprzak³

2020

Acta Phys. Pol. B

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“…The arrival of a positron to the target is tagged by a Micro-Channel Plate (MCP) which detects Secondary Electrons (SE) released by the impinging positrons, as shown in Fig.1 (see Ref. [14,15] for more details on the beam).…”

Section: Experimental Techniques and Setup 21 Positronium Productiomentioning

confidence: 99%

A new approach for the ortho-positronium lifetime determination in a vacuum cavity

Vigo

Raaijmakers

Gerchow

et al. 2018

J. Phys.: Conf. Ser.

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Currently, the experimental uncertainty for the determination of the orthopositronium (o-Ps ) decay rate is at 150 ppm precision; this is two orders of magnitude lower than the theoretical one, at 1 ppm level. Here we propose a new proof of concept experiment aiming for an accuracy of 100 ppm to be able to test the second-order correction in the calculations, which is 45 α π 2 ≈ 200 ppm. The improvement relies on a new technique to confine the o-Ps in a vacuum cavity. Moreover, a new method was developed to subtract the time dependent pick-off annihilation rate of the fast backscattered positronium from the o-Ps decay rate prior to fitting the distribution. Therefore, this measurement will be free from the systematic errors present in the previous experiments. The same experimental setup developed for our recent search for invisible decay of ortho-positronium is being used. The precision will be limited by the statistical uncertainty, thus, if the expectations are fulfilled, this experiment could pave the way to reach the ultimate accuracy of a few ppm level to confirm or confront directly the higher order QED corrections. This will provide a sensitive test for new physics, e.g. a discrepancy between theoretical prediction and measurements could hint the existence of an hidden sector which is a possible dark matter candidate.

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First search for invisible decays of orthopositronium confined in a vacuum cavity

Cited by 18 publications

References 52 publications

First direct detection constraint on mirror dark matter kinetic mixing using LUX 2013 data

First direct detection constraint on mirror dark matter kinetic mixing using LUX 2013 data

Feasibility of Ortho-positronium Lifetime Studies with the J-PET Detector in Context of Mirror Matter Models

A new approach for the ortho-positronium lifetime determination in a vacuum cavity

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