[单选题]
The Feynman diagram a7g(wv, xl6q nk7t6 aoshows two electrons approaching each other, in(k;x65cl )uc7rqad nm teracting, and then leaving each other. What particle is being exchanged during d(6x)cc m7 nl;ak5ruq the interaction?
A. pion
B. virtual photon
C. neutrino
D. $W$ particle
Post time 2024-1-22 02:15:01
