High-accuracy $Υ$-meson photoproduction data from EIC and EicC experiments will allow the measurement of the near-threshold total cross section of the reaction $γp\toΥp$, from which the absolute value of the $Υp$ scattering length, $|α_{Υp}|$, can be extracted using a Vector-Meson Dominance model. For this evaluation, we used $Υ$-meson photoproduction quasi-data from the QCD approach (the production amplitude can be factorized in terms of gluonic generalized parton distributions and the quarkonium distribution amplitude). A comparative analysis of $|α_{Υp}|$ with the recently determined scattering lengths for $ωp$, $ϕp$, and $J/ψp$ using the A2, CLAS, and GlueX experimental data are performed. The role of the "young" vector-meson effect is evaluated.
Institute of Theoretical Physics, Chinese Academy of Sciences（中国科学院理论物理研究所）；University of Chinese Academy of Sciences, School of Physical Sciences（中国科学院大学物理科学学院）
Deeply virtual pion production through two-loop order
State Key Laboratory of Nuclear Physics and Technology, Institute of Quantum Matter, South China Normal University（华南师范大学量子物质研究所核物理与技术国家重点实验室）；Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter, Guangdong Provincial Key Laboratory of Nuclear Science（广东省基础与应用基础研究基地物质结构与基本相互作用卓越中心广东省核科学重点实验室）；China University of Mining and Technology（中国矿业大学）；Institute of High Energy Physics, Chinese Academy of Sciences（中国科学院高能物理研究所）；School of Physics, Zhengzhou University（郑州大学物理学院）；School of Physical Sciences, University of Chinese Academy of Sciences（中国科学院大学物理科学学院）
本文首次计算了在广义BJorken极限下，γ_L* p→π+ n和γ_L* p→π^0 p过程的次次leading order (NNLO) QCD辐射修正，这些修正显著提高了perturbative QCD预测与JLab数据的一致性，并研究了双环QCD修正对纵向DVπP横截面及某些基准动量下横单旋不对称性(TSSA)的影响。
Assessing the impact of the electron ion collider in China on Deeply Virtual Compton Scattering
Hebei University（河北大学）；Institute of Modern Physics, Chinese Academy of Sciences（中国科学院近代物理研究所）；University of Chinese Academy of Sciences（中国科学院大学）；Department of Physics, University of Zagreb Faculty of Science（萨格勒布大学理学院物理系）
An alternative way to decipher the nature of the doubly charmed tetraquark $T_{cc}(3875)^+$: its antiparticle $T_{{\bar c}{\bar c}}(3875)^-$ photoproduction off nuclei near threshold
