Title: HORIZONTAL AIR SHOWERS AND VERY HIGH ENERGY HADRONIC

　　INTERACTIONS:  FROM COLLIDERS TO LHAASO.

　　Speaker: Dr. Andrea Addazi (Sichuan University and INFN Rome 2)

　　Host: Dr. Quanbu Gou

　　Time: 10:00 (Beijing Time), Friday, 2020-12-11

　　Place: 226 meeting room, Multidisciplinary Building, IHEP, CAS

　　Tencent meeting:  https://meeting.tencent.com/s/e5XR6PqHPGjG

　　Tencent meeting id:  907 406 189

　　Abstract:  

　　I will discuss the main aspects of horizontal air showers (HAS) analysis and very high energy interactions of Very High Energy (VHE) cosmic rays in high altitude atmosphere.  

　　I will show the main problematic issues in the modelization of hadronic interactions of very high energy cosmic rays with atmosphere nuclei, emphasizing the several implications for LHAASO experiment. The collision energy of very high energy CR particles is comparable to the Large Hadron Collider (LHC) one. Thus LHC data of proton-proton and proton-Nuclei collisions can provide precious information on VHE collision in high altitude atmosphere. This is essentially important for a CR “spectroscopy” — i.e for inferring the CR chemical composition —potentially “shining light” on the origin of VHE cosmic rays particles.  

　　Within my talk, I will also discuss on the main numerical and theoretical tools for describing VHE hadronic interactions; including SYBILL 2.1-2.3; EPOS-LHC and QJET.

　　Finally I comment on future possible directions in the field.  

　　About the speaker:  

　　Andrea Addazi is a professor in Sichuan University and an associate research member of INFN in Rome 2 group. He got his doctor degree in University of L’Aquila (UNIVAQ) and Gran Sasso National Laboratories (LNGS INFN). He is an expert in theoretical high energy physics, who had more than 80 publications in international journals in the last 6 years.