Identification of K-long meson in the Belle experiment

Long-lived neutral strange mesons (K-long) are identified by the energy deposits in the calorimeter (ECL) and the K-long and muon (KLM) detector in the Belle II experiment, which collects data from electron–positron collisions at center-of-mass energies near 10.58 GeV  in Japan. However, photons, neutrons, and other neutral hadrons can also deposit energy in the ECL and KLM detectors. The reconstruction of K-long is challenging due to the lack of satisfactory models that can describe well their shower shape and energy deposition in the detectors as well as the limited resolution of  the KLM detector.  This will improve the efficiency of neutral-hadron reconstruction and enhance the physics reach of Belle II analyses involving missing energy and heavy flavor physics observables.