Physics

The J/ particle is a meson made up of cc quark-antiquark pair. This particle is discovered in proton-proton and electron-positron collisions.

i) A proton collides with a proton at rest. Calculate the threshold energy for the incoming proton for this reaction to occur. p + p p + p + J/

ii) An electron collides with a positron, each of which has the same energy and opposite momenta. Calculate the threshold energy for either of the particles. e + + e- J/

mJ/ = 3 GeV, J/ = 10-20s