J/psi-pair production at NLL in TMD factorisation at the LHC
Alice Colpani Serri, Jelle Bor, Daniel Boer, Jean-Philippe Lansberg
备注：
LaTeX, 6 pages, 4 figures, uses pos.sty. Talk given by A. Colpani Serri at "The European Physical Society Conference on High Energy Physics (EPS-HEP2023)", 21-25 August 2023, Hamburg, Germany; Version to appear in PoS - Proceedings of Science
J/psi-pair production at the LHC is currently one of the few tools available to probe gluon transverse momentum distributions (TMDs). In this context, data from LHCb in the collider mode have the potential to probe the evolution of the unpolarised-gluon TMDs and to measure the distribution of the linearly-polarised gluon in unpolarised protons for the first time. In this proceedings contribution, improved predictions obtained for the LHC (at sqrt(s) = 13 TeV) up to next-to-leading logarithm (NLL) in TMD factorisation are presented. We show the obtained predictions of transverse-momentum distributions at different invariant masses and rapidities computed in the LHCb acceptance along with PDF uncertainty. We predict the azimuthal modulations of the cross section that arise from linearly-polarised gluons.
Single Spin Asymmetries in l p(transv. pol.) --> h X processes and TMD factorisation
本文给出了包含过程lp（transv.（pol.）--> h X的关系，并与新的实验数据进行了比较。这些预测是基于Sivers分布和Collins碎裂函数，其拟合在半包含深度非弹性散射（SIDIS）过程中测量的方位角不对称性（l p（transv.（pol.）--> l' h X）。根据横向动量相关分布和碎裂函数的因子分解（TMD因子分解）--即，分析SIDIS方位角不对称性的理论框架--假定在大P_T时对包含过程lp--> hX也成立。由此得到的A_N值在符号和形状上与数据一致。对今后的实验进行了展望。
Extraction of Quark Transversity Distribution and Collins Fragmentation Functions with QCD Evolution
研究了$e^+e^-$湮灭和半包含强子产生过程中柯林斯方位角不对称性的横动量相关演化。所有相关系数的计算精度均达到次首对数（NLL）阶精度。本文采用Collins-Soper-Sterman（CSS）近似NLL阶的TMD演化方法，通过对BELLE和BABAR合作组测量的$u$湮灭中背靠背双强子产生的Collins不对称性以及来自HERMES，COMPASS，JLab HALL A实验演化效应和相关的理论不确定性的影响进行了讨论。我们进一步讨论了结果的TMD解释，给出了非极化夸克分布、横动量分布、非极化夸克碎裂和Collins碎裂函数随横动量和硬动量标度的变化.我们对未来的实验进行了详细的预测，并讨论了它们的影响。
Determination of charged pion unpolarised TMDPDFs from Drell-Yan measurements
Institute of Physics, Academia Sinica（中央研究院物理研究所）；Department of Physics, Chung-Yuan Christian University（中原大学物理系）；Centre for High Energy Physics, Chung-Yuan Christian University（中原大学高能物理中心）；Institute of Physics, National Yang Ming Chiao Tung University（国立阳明交通大学物理研究所）；Physics Division, National Centre for Theoretical Sciences（国家理论科学中心物理组）
The quantum evolutions of the diffractive transverse-momentum dependent gluon distribution
CNRS（法国国家科学研究中心）；CEA（法国原子能和替代能源委员会）；European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*)（核物理及相关领域欧洲理论研究中心）；Fondazione Bruno Kessler（布鲁诺·凯斯勒基金会）；Key Laboratory of Particle Physics and Particle Irradiation (MOE)（粒子物理与粒子辐照教育部重点实验室）；Institute of frontier and interdisciplinary science, Shandong University（山东大学前沿交叉科学研究院）；Lawrence Berkeley National Laboratory（劳伦斯伯克利国家实验室）
