When a top quark is produced in high-energy particle collisions, it decays very quickly due to its high mass. The decay of a top quark typically involves the weak force, which allows it to transform into other particles.
The most common decay mode of a top quark is into a W boson and a bottom quark. The W boson, in turn, can decay into various combinations of particles, including quarks and leptons (such as electrons and neutrinos). In the case of the top quark decaying into protons or alpha particles, it is not a direct process within the decay of the top quark itself.
Protons and alpha particles (which are composed of two protons and two neutrons) are not directly produced through the decay of a top quark. These particles are stable and can exist independently, typically found within atomic nuclei. They are not directly formed from the decay products of the top quark.