[单选题]
The Feynman diagram sd)b u3ny-ni0zjy:l 6z hows xwlaq n0(q0og3pe 2vl fmh 8/,the weak interaction 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
