The Tomography of Nucleon: Lattice QCD calculation of the unpolarized transverse-momentum-dependent parton distributions

by Prof. Qi-An Zhang（张其安） (Beihang University)

Tuesday 19 Sept 2023, 10:00 → 12:00 Asia/Shanghai

5#/6th-603 - Meeting Room 603 (Science Building)

Abstract：

We present a first calculation of the unpolarized nucleon's isovector transverse-momentum-dependent parton distribution functions (TMDPDFs) from lattice QCD, which are essential to predict observables of multi-scale, semi-inclusive processes in the standard model. We use a N_f=2+1+1 MILC ensemble with valence clover fermions on a highly improved staggered quark sea (HISQ) to compute the quark momentum distributions in large-momentum nucleon on the lattice. The state-of-the-art techniques in renormalization and extrapolation in correlation distance on the lattice are adopted. The perturbative kernel up to next-to-next-to-leading order with RG resummation are taken into account, and the dependence on the pion mass and hadron momentum is explored. Our results are qualitatively comparable with phenomenological TMDPDFs, which provide an opportunity to predict high energy scatterings from the first principles.

 

Biography: 

张其安，北京航空航天大学副教授。2019年博士毕业于中国科学院高能物理研究所，2019-2021年于上海交通大学李政道研究所从事博士后研究，2021年加入北京航空航天大学。主要研究领域为强子结构与分布的格点量子色动力学模拟，包括核子部分子分布函数、三维横向动量依赖的部分子分布，介子部分子分布振幅，以及重味强子弱衰变等的非微扰研究，兼涉猎重味物理的唯象学研究。在包括《物理评论快报》(Physical Review Letters)在内的国际知名刊物上发表多篇学术论文，得到国际同行的高度认可。

Host: Prof. Yifeng Sun

Alternative online link:  https://meeting.tencent.com/dm/Aan2ib9jDKlC (id: 623175365, password: 123456)