Georges F, Rashad M N H, Stefanko A, Dlamini M, Karki B, Ali S F, Lin P-J, Ko H-S, Israel N, Adikaram D, Ahmed Z, Albataineh H, Aljawrneh B, Allada K, Allison S, Alsalmi S, Androic D, Aniol K, Annand J, Atac H, Averett T, Ayerbe Gayoso C, Bai X, Bane J, Barcus S, Bartlett K, Bellini V, Beminiwattha R, Bericic J, Biswas D, Brash E, Bulumulla D, Campbell J, Camsonne A, Carmignotto M, Castellano J, Chen C, Chen J-P, Chetry T, Christy M E, Cisbani E, Clary B, Cohen E, Compton N, Cornejo J C, Covrig Dusa S, Crowe B, Danagoulian S, Danley T, De Persio F, Deconinck W, Defurne M, Desnault C, Di D, Duer M, Duran B, Ent R, Fanelli C, Franklin G, Fuchey E, Gal C, Gaskell D, Gautam T, Glamazdin O, Gnanvo K, Gray V M, Gu C, Hague T, Hamad G, Hamilton D, Hamilton K, Hansen O, Hauenstein F, Henry W, Higinbotham D W, Holmstrom T, Horn T, Huang Y, Huber G M, Hyde C E, Ibrahim H, Jen C-M, Jin K, Jones M, Kabir A, Keppel C, Khachatryan V, King P M, Li S, Li W B, Liu J, Liu H, Liyanage A, Magee J, Malace S, Mammei J, Markowitz P, McClellan E, Mazouz M, Meddi F, Meekins D, Mesik K, Michaels R, Mkrtchyan A, Montgomery R, Muñoz Camacho C, Myers L S, Nadel-Turonski P, Nazeer S J, Nelyubin V, Nguyen D, Nuruzzaman N, Nycz M, Obretch O F, Ou L, Palatchi C, Pandey B, Park S, Park K, Peng C, Pomatsalyuk R, Pooser E, Puckett A J R, Punjabi V, Quinn B, Rahman S, Reimer P E, Roche J, Sapkota I, Sarty A, Sawatzky B, Saylor N H, Schmookler B, Shabestari M H, Shahinyan A, Sirca S, Smith G R, Sooriyaarachchilage S, Sparveris N, Spies R, Su T, Subedi A, Sulkosky V, Sun A, Thorne L, Tian Y, Ton N, Tortorici F, Trotta R, Urciuoli G M, Voutier E, Waidyawansa B, Wang Y, Wojtsekhowski B, Wood S, Yan X, Ye L, Ye Z, Yero C, Zhang J, Zhao Y, Zhu P
Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France.
Old Dominion University, Norfolk, Virginia 23529, USA.
Phys Rev Lett. 2022 Jun 24;128(25):252002. doi: 10.1103/PhysRevLett.128.252002.
We report high-precision measurements of the deeply virtual Compton scattering (DVCS) cross section at high values of the Bjorken variable x_{B}. DVCS is sensitive to the generalized parton distributions of the nucleon, which provide a three-dimensional description of its internal constituents. Using the exact analytic expression of the DVCS cross section for all possible polarization states of the initial and final electron and nucleon, and final state photon, we present the first experimental extraction of all four helicity-conserving Compton form factors (CFFs) of the nucleon as a function of x_{B}, while systematically including helicity flip amplitudes. In particular, the high accuracy of the present data demonstrates sensitivity to some very poorly known CFFs.
我们报告了在高比约肯变量(x_{B})值下对深度虚拟康普顿散射（DVCS）截面的高精度测量。DVCS对核子的广义部分子分布敏感，该分布提供了其内部组分的三维描述。利用初始和末态电子、核子以及末态光子所有可能极化态下DVCS截面的精确解析表达式，我们首次实验提取了核子的所有四个螺旋度守恒康普顿形式因子（CFFs）作为(x_{B})的函数，同时系统地纳入了螺旋度翻转振幅。特别地，当前数据的高精度表明对一些非常不为人知的CFFs具有敏感性。
