How exactly was antimatter produced, without reproducing the big bang(as said in the book 'Angels and Demons')

Answer 1

Not light. Charged particles such as electrons or protons are accelerated to great speed and collided with each other. If the total kinetic energy in the center-of-mass frame is greater than 2mc^2 before collision, where m is the particle mass, then a particle-antiparticle pair has a chance of being produced.

The pair is created by raising the energy of virtual particles which fill the vacuum to a positive level (where they are then said to be "real"). The vacuum is far from the "nothing" people think of it as. "Real" in this context does not have the metaphysical connotation that's usually associated with its common usage; it's just a technical term.

Answer 2

unless i'm mistaken it was 2 beams of light inside a particle accelerator that was sped up to an enormous speed and collided with each other. exactly how it was described i can't remember