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The observation of neutrinoless double-β decay (0νββ) would be direct evidence of lepton number violation (LNV) beyond the standard model, demonstrating that neutrinos are Majorana fermions, shedding light on the mechanism of neutrino mass generation, and probing a key ingredient (LNV) for generating the matter-antimatter asymmetry in the universe via “leptogenesis”. Therefore, the search for 0νββ decay has become a priority in nuclear and particle physics.
The experimental search for the 0νββ decay is a great challenge as it is an extremely rare process if exists. Currently, the best half-life lower limit (>10^26 years) is achieved in the experiments on 76Ge and 136Xe. The next-generation ton-scale experiments with sensitivity up to 10^28 years after a few years of running are expected to provide a definite answer on the mass hierarchy of neutrinos based on our current knowledge on the nuclear matrix element (NME), which cannot be measured, but must be determined from a theoretical calculation.
It is a challenge for nuclear theory to provide accurate theoretical values of the NMEs for candidate nuclei, which are vital for the design and interpretation of future experiments. Based on the standard light-neutrino exchange mechanism, the popularly used nuclear models predict NMEs differing from each other by a factor up to three, causing an uncertainty of an order of magnitude in the half-life for a given value of the neutrino mass. Besides, there are other "non-standard" transition operators which probably contribute to the 0νββ decay. One possible solution is the computation of the NMEs in nuclear many-body methods with controllable approximations using nuclear interactions and weak transition operators derived consistently from an (chiral) effective field theory (EFT) with the feature of order-by-order convergence.
The aim of this workshop is to review the current status and future plans of 0νββ decay search mainly in China, to address the physics of 0νββ decay from different energy scales, and to unify all the theoretical efforts to determine the NMEs with controllable uncertainty. The workshop will cover (but not limited to) the following topics:
- Neutrino physics
- Status and plans of 0νββ decay experiments
- LNV operators from Standard Model EFT
- Perspectives from lattice QCD
- Nuclear potentials and effective transition operators in chiral EFT
- Nuclear ab initio methods
- Nuclear shell models and energy density functionals
- Mean-field and beyond approaches (QRPA, PHFB, GCM, etc.)
- Application of machine learning in nuclear physics
Here are the (tentative) questions to be discussed in the workshop:
- What is the challenge and perspective on 0νββ decay search (in China)?
- What level of precision is required for the NMEs from experimental design?
- How other mechanisms contribute to the 0νββ decay?
- How to determine the LECs in the effective transition operators?
- How much should gA be quenched in 0νββ decay?
- How to reduce the discrepancy among different model predictions?
- How to quantify theoretical uncertainty in the predicted NMEs of each model?
- How can we exploit machine learning techniques in the determination of NMEs?
Invited speakers: (部分待定)
安振东, 焦长峰, 李宁, 肖翔, 尧江明, 张鹏鸣
袁彬老师(秘书): firstname.lastname@example.org (13536557040)