Yes, that is a valid question. When a positron, which is the antimatter counterpart of an electron, collides with a proton, several things can happen depending on the energy of the particles involved.
In a low-energy collision, the positron and proton can annihilate each other. Annihilation occurs when a particle and its corresponding antiparticle come into contact, resulting in the conversion of their masses into energy. In the case of a positron colliding with a proton, this process can produce high-energy gamma rays.
At higher energies, more complex interactions can occur. The positron and proton can undergo a process called electron-positron pair production, where they annihilate and produce a virtual photon. This photon can then convert into an electron-positron pair in the presence of another particle or field.
It's worth noting that antimatter interactions are typically studied in high-energy physics experiments, such as particle accelerators, where particles are accelerated to extreme speeds and energies to observe these interactions.