Bhabha scattering is a type of high-energy particle interaction in which an electron and a positron collide and produce other particles. This process was first proposed by Indian physicist Homi J. Bhabha in the 1930s.
Fermi statistics, also known as Fermi-Dirac statistics, is a type of quantum statistics that describes the behavior of particles with half-integer spin, such as electrons. This theory was developed by Enrico Fermi and Paul Dirac in the 1920s and is an important concept in understanding the behavior of particles in quantum mechanics.
The relative sign difference in Bhabha scattering refers to the difference in the relative signs of the incoming and outgoing particles. In this process, the electron and positron have opposite charges, so their relative sign is negative. However, the particles produced in the collision may have either positive or negative charges, resulting in a relative sign difference.
Bhabha scattering is one of the processes described by the Standard Model of particle physics, which is the current theory that explains the fundamental particles and their interactions. This process is an important test of the Standard Model and has been studied extensively in high-energy particle colliders.
Bhabha scattering has various applications in particle physics research, such as studying the properties of fundamental particles and testing the predictions of the Standard Model. It is also used in medical imaging techniques, such as positron emission tomography (PET), which relies on the annihilation of positrons and electrons to produce images of the body's internal structures.