摘要：
The Kilometer Square Array (KM2A) of the Large High Altitude Air Shower Observatory (LHAASO) aims at surveying the northern gamma-ray sky at energies above 10 TeV with unprecedented sensitivity. Gamma-ray observations have long been one of the most powerful tools for dark matter searches, as e.g., high-energy gamma-rays could be produced by the decays of heavy dark matter particles. In this work, we present the first dark matter analysis with LHAASO-KM2A, using the first 340 days of data from 1/2-KM2A and 230 days of data from 3/4-KM2A. Several regions of interest are used to search for a signal and account for the residual cosmic-ray background after gamma/hadron separation. We find no excess of dark matter signals, and thus place some of the strongest gamma-ray constraints on the lifetime of heavy dark matter particles with mass between 10^5 and 10^9 GeV. Our results with LHAASO are robust, and have important implications for dark matter interpretations of the diffuse astrophysical high-energy neutrino emission.

报告人简介：
Kenny Chun Yu Ng (吴震宇), assistant professor of the Chinese University of Hong Kong. Kenny got his Ph.D. from the Ohio State University. He was awarded the Croucher and Benoziyo fellows during his post-doctoral research at Weizmann Institute of Science, Israel, and Marie Curie Fellow at University of Amsterdam, the Netherland. Kenny’s research interest focus on astro-particle physics, such as gamma rays, neutrinos, cosmic rays, and dark matter detections.