41. When a particle and antiparticle scatter, virtual particles can be exchanged in two qualitatively different ways. 42. Bubble chamber experiments provide further evidence that antiparticles have the same inertial mass as their normal counterparts. 43. If CP symmetry holds, the decay rate of B mesons and their antiparticles should be equal. 44. The other case is that it is a Dirac fermion, which is not its own antiparticle . 45. :: : : There's no asymmetry between particles and antiparticles : both come out. 46. :I believe that in current theory, the graviton's antiparticle is also the graviton. 47. I was trying to work out how the whole nothing-> particle + antiparticle thing works. 48. These properties led Einstein to believe that pairs of particles and antiparticles could be described in this way. 49. A unified interpretation of antiparticles is now available in quantum field theory, which solves both these problems. 50. The counterpart to a Dirac fermion is a Majorana fermion, a particle that is its own antiparticle .
