Chávez José Manuel Morgado, Bertone Valerio, De Soto Borrero Feliciano, Defurne Maxime, Mezrag Cédric, Moutarde Hervé, Rodríguez-Quintero José, Segovia Jorge
Department of Integrated Sciences and Center for Advanced Studies in Physics, Mathematics and Computation, University of Huelva, E-21071 Huelva, Spain.
Irfu, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France.
Phys Rev Lett. 2022 May 20;128(20):202501. doi: 10.1103/PhysRevLett.128.202501.
We present the first systematic feasibility study of accessing generalized parton distributions of the pion at an electron-ion collider through deeply virtual Compton scattering. Relying on state-of-the-art models for pion GPDs, we show that quarks and gluons interfere destructively, modulating the expected event rate and maximizing it when parton content is generated via radiation from valence dressed quarks. Moreover, gluons are found to induce a sign inversion for the beam-spin asymmetry in every model studied, being a clear signal for pinning down the regime of gluon superiority.
我们展示了在电子-离子对撞机上通过深度虚拟康普顿散射获取π介子广义部分子分布的首个系统可行性研究。依靠最先进的π介子广义部分子分布模型，我们表明夸克和胶子存在相消干涉，这会调制预期的事件率，并且当部分子内容通过价夸克的辐射产生时，事件率会达到最大值。此外，在所研究的每个模型中，都发现胶子会导致束流自旋不对称性出现符号反转，这是确定胶子优势区域的一个明确信号。
