Speaker
Description
Mesons produced in cosmic-ray-induced hadronic cascades face two competing fates: they may either interact to initiate lower-energy hadronic showers or decay into muons. As atmospheric temperature rises, air density decreases, reducing the interaction probability of mesons and thereby enhancing their decay into muons. This results in a positive correlation between the underground muon flux and atmospheric temperature. The strength of this correlation varies with the depth of overburden, as the overlying rock preferentially attenuates low-energy muons—those originating from parent mesons that are less sensitive to temperature changes.
The Daya Bay Reactor Neutrino Experiment is well suited for studying this effect, featuring three underground experimental halls located at different depths. Using the full dataset comprising over 14 billion cosmic muon events recorded across these halls, we extract correlation coefficients for each site. We evaluated multiple analysis techniques employed in the literature to ensure robustness and consistency of our results. In this presentation, I will report the latest results including comparison with theoretical predictions as well as published results from other experiments.
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