pion138.

pion138Download: Download hh-res image (147KB) Download: Download full-size image F. 2. Chronology plot of the charged pion mass evolution. Black symbols and s: resultsIn particle physics, a pion ( ˈ p aɪ. ɒ n , PIE-on) or pi meson, denoted with the Greek letter pi (π), is any of three subatomic particles: π 0, π +, and π −Each pion consists of a quark and an