Quantum Field Theory - Norbury J.

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Quantum Field Theory
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In particle physics and quantum field theory we are usually dealing with particles that are moving fast and are very small, i.e. the particles are both relativistic and quantum mechanical and therefore our formulas have lots of factors of с (speed of light) and h (Planck's constant). The formulas considerably simplify if we choose a set of units, called natural units where з and h are equal to set 1. In CGS units (often also called Gaussian [Jackson appendix] units), the basic quantities of length, mass and time are centimeters {cm), gram (g), seconds (sec), or in MKSunits these are meters (m), кілограму (kg), seconds. In natural units units of the length, mass and time are all expressed in GeV..