SpinorUBar[p, m]
denotes a -spinor that depends on the -dimensional momentum .
Overview, Spinor, SpinorU, SpinorV, SpinorVBar, SpinorUBarD, SpinorUD, SpinorVD, SpinorVBarD.
[p, m] SpinorUBar
[p, m] // FCI // StandardForm
SpinorUBar
(*Spinor[Momentum[p], m, 1]*)
[p] SpinorUBar
[p] // FCI // StandardForm
SpinorUBar
(*Spinor[Momentum[p], 0, 1]*)
[p] . GS[p]
SpinorUBar
[%] DiracEquation