Why do particles have antiparticles?

In particle physics, every type of particle is associated with an antiparticle with the same mass but with opposite physical charges (such as electric charge). While the electron has a negative electric charge, the positron has a positive electric charge, and is produced naturally in certain types of radioactive decay.

What happens when particles and antiparticles collide?

Annihilation, in physics, reaction in which a particle and its antiparticle collide and disappear, releasing energy. The most common annihilation on Earth occurs between an electron and its antiparticle, a positron.

Do particles and antiparticles attract?

Not true. Particle-antiparticle pairs have the same mass, and spin/isospin (I think), but they have opposite charge, baryon number, lepton number, strangeness, charm, bottomness, (and probably more stuff). Gravity.

Why Does antimatter exist?

Antiparticles are created everywhere in the universe where high-energy particle collisions take place. Antimatter may exist in relatively large amounts in far-away galaxies due to cosmic inflation in the primordial time of the universe.

When does annihilation occur in a subatomic particle?

In particle physics, annihilation is the process that occurs when a subatomic particle collides with its respective antiparticle to produce other particles, such as an electron colliding with a positron to produce two photons. The total energy and momentum of the initial pair are conserved in the process and distributed among a set of other

Can a particle and its anti-particle annihilate?

A particle and its anti-particle that are stationary can annihilate to make a particle and its antiparticle as long as the initial particle is heavier than the final particle. A particle and its anti-particle that are stationary cannot annihilate to make a particle and its antiparticle if the final particle is heavier than the initial particle.

How are photons produced during a low energy annihilation?

During a low-energy annihilation, photon production is favored, since these particles have no mass. However, high-energy particle colliders produce annihilations where a wide variety of exotic heavy particles are created.

How are the quantum numbers of antiparticles conserved?

The total energy and momentum of the initial pair are conserved in the process and distributed among a set of other particles in the final state. Antiparticles have exactly opposite additive quantum numbers from particles, so the sums of all quantum numbers of such an original pair are zero.