Speaker
Description
Antiprotons in cosmic rays provide an important tool for probing cosmic ray propagation and investigating the potential existence of dark matter. As cosmic rays approach the Earth, they are influenced by the geomagnetic field, which causes the deflection directions of protons and antiprotons to differ. This effect allows for the search for antiparticles in the direction opposite to the observed deficit of cosmic rays caused by the Moon. We searched for the Moon shadow produced by antiprotons in the energy range of 2.3 TeV to 70.8 TeV by observing the LHAASO WCDA experiment over 41 months from March 2021 to July 2024. The results indicate that there is no evidence for the existence of antiprotons, but we provide upper limits on the flux ratio of antip/p ratio for the corresponding energy range.
