[单选题]
The Feynman diagram shows two electrtg 4p zj3yil,f)j078f6 jd3seqgnvk 8ons approachin qf5:ur7af5 wxg each other, interacting, and then lxwr :5u7 f5fqaeaving each other. What particle is being exchanged during the interaction?
A. pion
B. virtual photon
C. neutrino
D. $W$ particle
Post time 2024-1-22 02:15:01
