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) 白春林（四川大学） 仇浩 （中科院近代物理研究所） 房栋梁（中科院近代物理研究所） 冯旭 （北京大学） 高早春 （原子能院） 耿立升 （北航） 韩柯 （上海交大） 黄焕中 (复旦大学） 李刚 (UMass) 李高嵩 (中科院高能所) 李剑 （吉林大学） 廖益 （南开大学） 龙炳蔚 （四川大学） 龙文辉 （兰州大学） 吕炳楠 （中国工程物理研究院） 罗延安 （南开大学） 马永亮 （国科大杭州高等研究院） 梅元 (LBNL) 牛一斐 （兰州大学） 庞龙刚 （华中师范大学） 任中洲 （同济大学） 王少博 （上海交大） 王小保 （湖州师范） 温良剑 (中科院高能所) 邢志忠 (中科院高能所) 杨丽桃 （清华大学） 于江浩 （中科院理论所） 张肇西 （中科院理论所） 赵鹏巍 （北京大学） 赵玉民 （上海交大） 周顺 (中科院高能所) ...
尧江明 邀请您参加腾讯会议 会议主题：无中微子双贝塔衰变研讨会 会议时间：2021/05/20-2021/05/23 08:00-20:00(GMT+08:00) 中国标准时间 - 北京, 每天 点击链接入会，或添加至会议列表： https://meeting.tencent.com/s/eGpebEXX6GG7 会议 ID：838 6938 5738 会议密码：(请与会议负责人联系索要密码) 手机一键拨号入会 +8675536550000,,83869385738# (中国大陆) +85230018898,,,2,83869385738# (中国香港) 根据您的位置拨号 +8675536550000 (中国大陆) +85230018898 (中国香港)
组织委员会成员(中山大学): 安振东, 焦长峰, 李宁, 肖翔, 尧江明（负责人）, 张鹏鸣
科学顾问委员会成员： 何小刚、黄焕中、季向东、廖益、刘江来、孟杰、 任中洲、王为、邢志忠、许怒、岳骞、张焕乔、张肇西
会议联络人： 袁彬老师(秘书): yuanb25@mail.sysu.edu.cn (13536557040)
尧江明教授：yaojm8@mail.sysu.edu.cn
Program and talks can be found here: https://nldbd-china.github.io
