山东大学：TMD evolution at small x（讲稿，主讲：周剑）

TMD evolution at small x Jian Zhou ShanDong University Based on the papers: arXiv:1603.07426JZ,2016 arXiv:1703.06163 Bowen Xiao,Feng Yuan,JZ,2017 arXy:1807.00506JZ2018 USTC,April 2019,Hefei

TMD evolution at small x Jian Zhou ShanDong University USTC, April 2019, Hefei Based on the papers: arXiv:1603.07426 JZ, 2016 arXiv:1703.06163 Bowen Xiao, Feng Yuan, JZ, 2017 arXiv:1807.00506 JZ 2018

Outline: >Background:EIC physics >Joint TMD and small x resummation Summary

Outline:  Background: EIC physics  Joint TMD and small x resummation  Summary

Medium energy QCD(12Gev-500Gev) RHIC,Jlab,EIC,EicC

Medium energy QCD (12GeV-500GeV) RHIC, Jlab, EIC, EicC

The internal structure of nucleon and nucleus How are the sea quarks and gluons distributed in space and momentum inside the nucleon? How is proton spin decomposed into different pieces?Spin-Orbit correlation? Where does the saturation of gluon densities set in? Stimulate new progress of pQCD theory Ultimately,shed new light on QCD confinement

The internal structure of nucleon and nucleus  How are the sea quarks and gluons distributed in space and momentum inside the nucleon?  How is proton spin decomposed into different pieces? Spin-Orbit correlation?  Where does the saturation of gluon densities set in?  Stimulate new progress of pQCD theory  Ultimately, shed new light on QCD confinement ?

PDFs The internal structure of nucleon/nuclei in terms of quark and gluon degree of freedom. "Initial conditions"in ep/eA/pp/pA/AA collisions. Collinear parton distributions. k~xp DIS: (k)<2 The simpliest ones:unpolarized integrated parton distributions:f(x),G(x)

PDFs The internal structure of nucleon/nuclei in terms of quark and gluon degree of freedom. "Initial conditions" in ep/eA/pp/pA/AA collisions. Collinear parton distributions. The simpliest ones: unpolarized integrated parton distributions: f(x), G(x)

QCD factorization theorem tells us how to link measurable cross sections to parton distributions,in which important information on nucleon/nucleus is encoded

QCD factorization theorem tells us how to link measurable cross sections to parton distributions, in which important information on nucleon/nucleus is encoded

The extensions of PDes 3-dimensional imaging of nucleon: xp,kt:TMDs SIDIS xp,bt:GPDs DVCS... 5-dimensional imaging of nucleon: Parton Wigner distributions,GTMDs. Measurable in High energy scatterings as well Nucleon spin structure: Spin dependent PDFs,spin dependent TMDs &GPDs Multiple parton re-scattering: High twist correlation functions

The extensions of PDFs 3-dimensional imaging of nucleon: xp, kt: TMDs SIDIS xp, bt: GPDs DVCS… 5-dimensional imaging of nucleon: Parton Wigner distributions, GTMDs. Measurable in High energy scatterings as well Nucleon spin structure: Spin dependent PDFs, spin dependent TMDs &GPDs Multiple parton re-scattering: High twist correlation functions

The study of various type parton distributions and the associated QCD factorization properties are one of main focus in the EIC physics(TMD/Spin/Small x)community

The study of various type parton distributions and the associated QCD factorization properties are one of main focus in the EIC physics (TMD/Spin/Small x) community

Parton distributions not only encode information on nucleon internal structure, but also useful design for summing large logarithms in perturbation series. as In2 好 >>1

Parton distributions not only encode information on nucleon internal structure, but also useful design for summing large logarithms in perturbation series. >> 1

Parton distributions in general are not perturbative calculable. Their change with varying x,scale,are predictable in pQCD. G(,kL,2=u2=Q)

Parton distributions in general are not perturbative calculable. Their change with varying x, scale, are predictable in pQCD