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A characteristic feature of the behavior of particles and antiparticles - their annihilation in the collision. Annihilation processes are, of course, with conservation of energy, momentum, electric charge, etc. It can be produced not only photons but also other particles, it is obvious that due to conservation laws of the various charges and are born at the same time the corresponding antiparticles.
In recent years, the annihilation process is increasingly being used as one of the most sophisticated methods of investigation of the microcosm.
The operation of replacing particles by antiparticles is called charge conjugation. Since truly neutral particles identical to their antiparticles, then the operation of charge conjugation, they transform into themselves. Therefore, truly neutral particles are characterized by a particular quantum number, called charge-parity, and show the behavior of the wave function of a particle with charge conjugation. Charge parity can be positive. This means that the wave function of these particles does not change under charge conjugation. But there are truly neutral particles whose charge parity is negative, i.e., their wave function at the corresponding operation changes the sign. An example of such a particle is a photon - a quantum electromagnetic field. It's pretty easy to understand, because the electric and magnetic fields change sign when the signs of all charges, i.e., when the operation of charge conjugation. In strong and electromagnetic interactions, there is complete symmetry between particles and antiparticles, if possible a process of the particles, it is possible and has the same characteristics similar process with the corresponding antiparticles. This means that such interactions do not change, in particular, the charge parity truly neutral particle or particle system. So, for example, mesons with positive charge parity electromagnetic decay to the two photons (each of which has a negative charge parity) and cannot decay into three photons. Then, just as protons and neutrons due to the strong interaction are linked in the kernel of the corresponding anti-particles will form an anti - core. |