中国物理学会高能物理分会第十三届全国粒子物理学术会议（2021）

We’ll present the first lattice QCD calculation of transverse momentum dependence wave function of pion using large momentum effective theory. We use the clover fermion action on three ensembles with 2+1+1 flavors of highly improved staggered quarks (HISQ) action, generated by MILC collaboration, at pion mass 670MeV and 0.12 fm lattice spacing, choose three different hadron momenta Pz={1.72, 2.15, 2.58} GeV. Our target is to extract Collins-Soper kernel from quasi transverse momentum dependence wave function(quasi-TMDWF), which is computed on lattice calculation. For quasi-TMDWF, we use non perturbative renormalization in MSbar scheme by using Wilson-loop renormalization. We find the Collins-Soper is positive when transverse momentum is small. This is different from other groups results.