Speaker
Description
The Jiangmen Underground Neutrino Observatory (JUNO) has reported its first physics results, highlighting its capability for precision measurements of neutrino oscillation parameters. Achieving this precision requires a robust inverse beta decay (IBD) event selection and stringent control of background contributions. Among cosmogenic isotopes, the $\beta$-$n$ decay of long-lived $^{9}$Li and $^{8}$He produces a double-coincidence signal that mimics IBD signatures, presenting the most critical background to oscillation parameter measurement. Accurate estimation and suppression of this background are crucial.
This poster presents JUNO's comprehensive cosmogenic background analysis, achieving significant reduction of more than an order of magnitude through advanced muon veto methods. It will also show combined fits across muon energy intervals for improved rate estimation, detailed spectral measurements, and systematic uncertainty evaluation, providing essential inputs for JUNO's oscillation analysis.