TEORIA GRACELI DE NÚMEROS DE SPINORES, TENSORES E MOMENTUM INTRÍNSECO. In quantum field theory , the Dirac spinor is the spinor that describes all known fundamental particles that are fermions , with the possible exception of neutrinos . It appears in the plane-wave solution to the Dirac equation , and is a certain combination of two Weyl spinors , specifically, a bispinor that transforms "spinorially" under the action of the Lorentz group . Dirac spinors are important and interesting in numerous ways. Foremost, they are important as they do describe all of the known fundamental particle fermions in nature ; this includes the electron and the quarks . Algebraically they behave, in a certain sense, as the "square root" of a vector . This is not readily apparent from direct examination, but it has slowly become clear over the last 60 years that ...