ABSTRACT
To understand the nature of interactions of any particles at very high energies, one needs to treat the particles as quantum elds and study them in Quantum eld theory (QFT), which started as an elegant theory of relativistic quantum electrodynamics (QED) [1, 2, 3]. Although the beauty of the theory was plagued with all kinds of apparent innities, the QFT was accepted because of its predictability. The innities are accepted as our inability to deal with interactions at very high energies, not as a problem with the theory. Proper mathematical prescriptions, called renormalization, to take care of the innities are then introduced to maintain the predictive power of the theory even at high energies. So far no discrepancy between the predictions of QFT and experiments has been noticed, which makes it one of the building blocks for our present knowledge of particle physics.
