When particles and antiparticles interact, they annihilate each other and produce photons. Particles and antiparticles have the same mass but they differ in charge. In particle physics, each particle has a corresponding antiparticle. Electrically charged leptons are called electron-like lepton, and neutral leptons are called neutrinos. Lepton is light mass particles with half-integer spins. Light mass particles are called leptons, medium mass particles are known as Mesons and heavy particles are called baryons. One more classification can be based on the masses of the particles. Particles with an integer value of spin, eg. All the particles with half-odd integer spin eg. One way could be to categorize them in terms of their spin. What is Lepton?Įlementary particles can be categorized in many ways. It is called the “Standard Model” in physics. Hence physicists introduced a scheme to categorize these particles. They were so many that it became difficult to keep track of them. In this process, many new particles got discovered. Physicists started using particle accelerators to bang particles to each other with higher and higher energies. But as years progressed, technological advancements increased the accuracy and capacity of the labs. In the 1930s, many physicists thought that the problem of the fundamental structure of matter is solved. Protons and neutrons reside in the nucleus and the electrons revolve around it. Slowly, it became clear that the atom consists of electrons, protons, and neutrons. They found that an atom is made is not indivisible, and it is made of smaller particles. At the beginning of the 20th century, several experiments were carried out by the physicists like Thomson, Rutherford, etc. The question “What is the universe made of?” is baffling scientists since ancient times.
In the history of physics, the composition of matter was always a central question.
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