Matter creation is the process inverse to particle annihilation. It is the conversion of massless particles into one or more massive particles. This process is the time reversal of annihilation. Since all known massless particles are bosons and the most familiar massive particles are fermions, usually what is considered is the process which converts two bosons (e.g. photons) into two fermions (e.g., an electron–positron pair).
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Some articles on matter creation:
... Because of momentum conservation laws, the creation of a pair of fermions (matter particles) out of a single photon cannot occur ... However, matter creation is allowed by these laws when in the presence of another particle (another boson, or even a fermion) which can share the primary photon's momentum ... Thus, matter can be created out of two photons ...
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