The Large High Altitude Air Shower Observatory (LHAASO) project, one of China's major national scientific and technological infrastructure facilities, has successfully passed national acceptance and formally gone into operation. LHAASO is a facility focusing on cosmic ray observation and research. It was approved by the National Development and Reform Commission (NDRC) on Dec. 31, 2015. Jointly sponsored by the Chinese Academy of Sciences (CAS) and the People’s Government of Sichuan Province, the construction project was undertaken by the Chengdu Branch of CAS and the Institute of High Energy Physics (IHEP) of CAS. The construction of the main part of the facility began in 2017 and was completed in 2021. The LHAASO project passed an acceptance inspection by five professional teams organized by CAS that covered the following areas: technical performance, construction and installation, financial matters, equipment and assets, and records.

Scientists from the Large High Altitude Air Shower Observatory (LHAASO) have presented roughly 1.5 years of observational data, calculating new limits on the lifetime of heavy dark matter particles that have masses between 10^5 and 10^9 giga-electron volts. The study, entitled “Constraints on heavy decaying dark matter from 570 days of LHAASO observations,” was recently published as a highlight letter in Physics Review Letter.

Researchers from the Institute of High Energy Physics of the Chinese Academy of Sciences examined the validity of the theory of relativity with the highest accuracy in a study entitled “Exploring Lorentz Invariance Violation from Ultrahigh-Energy γRays Observed by LHAASO,” which was published in the latest issue of Physics Review Letter.