Speaker
Description
The Jiangmen Underground Neutrino Observatory (JUNO) is a 20-kiloton multipurpose liquid scintillator detector located in Guangdong Province, China. It is designed to address several fundamental open questions in neutrino physics. Following the completion of detector construction in 2024, JUNO entered the data taking phase in September 2025.
Positioned at an optimized baseline of approximately 52.5 km from the Yangjiang and Taishan Nuclear Power Plants, JUNO is designed to achieve its primary physics goals: determining the Neutrino Mass Ordering (NMO) and performing sub-percent precision measurements of the oscillation parameters Δm²21, sin²(2θ₁₂), and Δm²31 simultaneously. Reaching these ambitious objectives requires highly accurate event vertex reconstruction with great stability across the large active volume.
Vertex reconstruction in JUNO represents a particularly challenging task due to the detector large size and the presence of complex optical effects, especially near the detector boundary. In this poster, three different vertex reconstruction approaches are presented, and their performance is evaluated and compared.