Chiral properties of the nucleon interpolating current and $\theta$-dependent observables

Yohei Ema, Ting Gao, Maxim Pospelov +1

We revisit the chiral properties of nucleon interpolating currents, and show that of the two leading order currents $j_1$ and $j_2$, only two linear combinations $j_1\pm j_2$ trans…