I was recently reading "Particle Physics: A Very Short Introduction" by Oxford University Press, and in it (I haven't finished it yet though) he says,
"The weak force changes one variety of particle into another, such as in certain forms of of radioactivity. It can change a proton into a neutron, or vice versa, leading to transmutation of the elements. In doing so it also liberates particles known as neutrinos."
Being someone who thinks best with a diagram, I drew this based on the available information.
To me, it appears that a neutrino must have an negative charge to cancel the charge or the proton and make it neutral. The knowledge that a neutron is ever so slightly heavier than proton just seems to confirm that the neutron is actually a tightly bound unit of a proton and a neutrino. However, I also know that neutrinos are said to have zero charge, and I know (or thought I did) the neutron is composed of 3 quarks.
Obviously the neutrino cannot have a charge, or the billions of neutrinos zipping around would interact with matter far more than they do. They certainly live up to their nickname of "ghost particles", so what's going on here?
My best guess is the book is an oversimplifying things, or saving them for a later chapter.