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