i have met a problem about the commutator of x and p.
[x,p]=ihbar
/p> is the eigenstate of momentum operator p.
<p/xp-px/p>
=<p/xp/p>-<p/px/p>
=p<p/x/p>-p<p/x/p> the second term is got by the momentum operator p acting on
the left state.
=0...
recently i am reading chiral symmetry in QFT. Almost all textbooks define γ5 as a chiral
operator without saying some reasons. i am very confused why γ5 has something to do with
chiral symmetry, can somebody explain it more intuitively and physically? who first introduce γ5 as a chiral...