Conveners
Low energy
- Yuki Fujii (Monash University (AU))
Low energy: Room C
- Jacinda Ginges
Low energy
- Ulrik Egede (Monash University (AU))
An overview of the search for permanent electric dipole moments in atoms and molecules will be given, with a particular focus on the theory that connects the measurements in atoms and molecules to fundamental CP-violating parameters.
The imbalance of matter and anti-matter in our universe provides compelling motivation to search for new particles that violate CP symmetry. The fields associated with the hypothetical new particles would interact with Standard Model particles, giving them CP-violating electric dipole moments (EDMs). In this talk, I will present the most precise measurement yet of the electron’s EDM using...
The muon anomaly, $a_\mu=(g_{\mu}-2)/2$, is a low-energy observable which can be both measured and computed to high precision, making it a sensitive test of the Standard Model (SM) and a probe for new physics. The current discrepancy between the experimental value and the Standard Model calculation from the Muon $g-2$ Theory Initiative [T. Aoyama et al. - Phys. Rep. 887, 1 (2020)] is...
In 2020, the DAMIC collaboration reported a 3 Sigma excess while searching for low-mass WIMPs using silicon CCD detectors with an analysis energy threshold of 50 eVee that were situated in SNOLAB. Since then, the experiment was upgraded to make use of skipper-CCD readout, which allows single-electron energy resolution. With this upgrade, the energy threshold could be reduced to 23 eVee,...
The Majorana nature of the neutrino, i.e., whether it is its own antiparticle, remains an open problem in modern physics. The observation of the hypothesized second order weak interaction, Neutrinoless Double Beta Decay (0$\nu\beta\beta$), is the only known experimental signature which would conclusively establish the Majorana nature of neutrinos. It would also demonstrate lepton number...
Electric charge quantization is a long-standing question in particle physics. While fractionally charged particles (millicharged particles hereafter) have typically been thought to preclude the possibility of Grand Unified Theories (GUTs), well-motivated dark-sector models have been proposed to predict the existence of millicharged particles while preserving the possibility for unification....
The MEG experiment searches for the μ+ → e+ γ decay and has set the most stringent upper limit on its branching ratio B(μ+ → e+ γ) < 4.2 10-13 at 90% C.L. It is a factor 30 improvement over the previous limit set by the MEGA experiment (B(μ+ → e+ γ)< 1.2 10-11 at 90% C.L.) and also the strongest bound on any forbidden particle decay.
The compelling physics motivation to further explore the...
If dark matter is ultralight, the number density of dark matter is very high and the techniques of zero-temperature field theory are no longer valid. The dark matter number density modifies the vacuum giving it a non-negligible particle occupation number. For fermionic dark matter, this occupation number can be no larger than one. However, in the case of bosons the occupation number is...
The anomalous magnetic moment of muon has been used as an indication of physics beyond the Standard Model. Fermilab Muon g-2 experiment has published the most precise measurement of the anomalous magnetic moment of muon with an uncertainty of 460 part-per-billion which showed 4.2 sigma discrepancy between the experiment average and the 2020 g-2 Theory Initiative Standard Model prediction. This...
