The fundamental interaction mediated by this particle is described by the U(1) symmetry group. These particles form bosonic quasiparticles called polaritons when they interact with dipole excitations. Neutral pions mostly decay into two of these particles, whose scattering f
The fundamental interaction mediated by this particle is described by the U(1) symmetry group. These particles form bosonic quasiparticles called polaritons when they interact with dipole excitations. Neutral pions mostly decay into two of these particles, whose scattering from electrons has a cross section given by the (*) Klein-Nishina formula. Interactions of two of these particles at high energies can create electrons and positrons through pair production, and these particles are produced in matter-antimatter annihilations. These particles are the gauge bosons of electromagnetism, have spin zero, and are massless. For 10 points, identify these particles, the quantized units of light.
The fundamental interaction mediated by this particle is described by the U(1) symmetry group.
photon