Speaker
Description
The JUNO experiment is a multi-purpose anti-neutrino oscillation experiment with the main objective of determining the neutrino mass ordering ($\nu$MO). The baselines to its two major reactors are both 53 km. JUNO's goal is to achieve 3$\sigma$ sensitivity of $\nu$MO with 6-year of data taking, so it is critical to obtain an unprecedented energy resolution, better than 3% at 1 MeV. The JUNO Central Detector (CD), a 20 kton liquid scintillator detector, will be built with high PMT photocathode coverage and good transparency for this purpose.
Despite the 700m overburden, the atmospheric muon-induced background is still estimated to be non negligible compared to the expected signal for the $\nu$MO determination. A veto system was designed for muon detection to further suppress muon-induced background. Two subsystems are used for the muon veto strategy: the Top Tracker (TT) and the Water Cherenkov Detector (WCD). The TT is a 3-layer muon tracker covering about 60% of the surface above the WCD and will provide precise atmospheric muon tracking. These well reconstructed muons are essential in the JUNO veto strategy for rejecting cosmogenic isotopes ($^9$Li and $^8$He). Combining the muon information from the TT and the WCD, our veto strategy will remove most of the atmospheric muon-induced background.
This poster will discuss the current status and the expected performance of the JUNO Top Tracker.
