Goal

To study quantum theories with a radiation signature that can be detected by SABRE

Investigated processes

Wave function collapse models such as Continuous spontaneous localisation
Pauli Exclusion Principle
Quantum Gravity theories

Stage 1

Process	Info	Signature	Selection	Background rate	Limits on signal rate	Limits on model parameters	Current limits

Process	Info	Signature	Selection	Background rate	Limits on signal rate	Limits on model parameters	Current limits
Theo		Theo	Exp	Exp	Exp	Theo	Theo
Continuous spontaneous localisation	reference	Spontaneous radiation emission dR/dLmddE= k * Lmd/E in range 10-1000 keV assume is valid form 1 keV	1 crystal with energy [1,20] keV. Background rate above 20 keV too high to add anything significant No energy in liquid scintillator	0.4 cpd/keV/kg --> 400000 counts in 3 years	<1500 counts --> < 0.001 cpd/keV/kg	lambda< e-13s	lambda< e-11s
Pauli Exclusion Principle violation	reference	Electron transition 25-40 keV emission	1 crystal [25,35] keV high background above 35 keV No energy in liquid scintillator	0.4 cpd/keV/kg
Pauli Exclusion Principle violation		Nuclear transition 10 MeV emission	Scintillator + crystal signal >10 MeV Muon detector veto	background from muons, muon flux = …. veto efficiency= expected rate =
Quantum gravity

Stage 2 (example)

Continuous spontaneous localisation results competitive (1st), PEP nuclear violation less competitive (2nd), PEP electron violation not competitive (3rd). Quantum gravity undetectable (discarded)

Stage 3 (example)

Process	Signature	Selection	Background rate	Limits on signal rate	Limits on model parameters	Current limits	Writing

Process	Signature	Selection	Background rate	Limits on signal rate	Limits on model parameters	Current limits	Writing
Theo	Theo	Exp	Exp	Exp	Theo	Theo	Theo/Exp
Continuous spontaneous localisation	correction factor applied to approximate the rate reduction between 1 and 10 keV	range extended to 25 keV as the extra range improves the limit	estimated 10% uncertainty on the background level	updared limit based on new assumptions	lambda< e-12s	lambda< e-11s	process description signature selection background results
Pauli Exclusion Principle violation	Electron transition 25-40 keV emission
Pauli Exclusion Principle violation	Nuclear transition 10 MeV emission

Meeting room

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Reference material

PEP Violation - https://link.springer.com/content/pdf/10.1140/epjc/s10052-009-1068-1

Spontaneous Emission - Novel CSL bounds from the noise-induced radiation emission from atoms

https://link.springer.com/article/10.1140%2Fepjc%2Fs10052-021-09556-0

(Public) ARC CoE for Dark Matter Particle Physics

Quantum Mechanics