Abnormal threshold behaviors of photo-pion production off the proton in the GZK region
Abnormal threshold behaviors of photo-pion production off the proton in the GZK region
The confirmation of the existence of GZK cut-off was tortuous, leading to activities to explore new physics, such as the cosmic-ray new components, unidentified cosmic-ray origins, unknown propagation mechanism, and the modification of fundamental physics concepts like the tiny Lorentz invariance violation (LV). The confirmation of the GZK cut-off provides …