[单选题]
The Feynman diagram shows the (lywe:t um 7,gfkg8j5weak inte rmqt s/+aw:h5raction of a neutrino ($\nu$) and a neutron ($n$), mediated by a $W+$ particle. The interaction produces an electron ($e-$) and another particle. What is the other particle?
A. a positron ($e+$)
B. a pion ($\pi+$)
C. a proton ($p$)
D. a quark
E. an anti-neutron
Post time 2024-1-22 02:15:01
