What is the kinetic temperature required to fuse two protons in a plasma? How much energy does it release? What are the products of the fusion reaction?
This is answered in the wikipedia article on proton-proton chain reaction
The first step in all the branches is the fusion of two protons into deuterium (D). As the protons fuse, one of them undergoes beta plus decay, converting into a neutron by emitting a positron and an electron neutrino
$p + p → D + e^+ + ν_e$
The positron will probably annihilate with an electron from the environment into two gamma rays. Including this annihilation the whole reaction has a Q value (released energy) of 1.442 MeV.