Mäntysaari Heikki, Mueller Niklas, Salazar Farid, Schenke Björn
Department of Physics, University of Jyväskylä, P.O. Box 35, 40014 University of Jyväskyä, Finland.
Helsinki Institute of Physics, P.O. Box 64, 00014 University of Helsinki, Finland.
Phys Rev Lett. 2020 Mar 20;124(11):112301. doi: 10.1103/PhysRevLett.124.112301.
We study inclusive and diffractive dijet production in electron-proton and electron-nucleus collisions within the color glass condensate effective field theory. We compute dijet cross sections differentially in both mean dijet transverse momentum P and recoil momentum Δ, as well as the anisotropy in the relative angle between P and Δ. Our results cover a much larger kinematic range than accessible in previous computations performed in the correlation limit approximation, where it is assumed that |P|≫|Δ|. We validate this approximation in its range of applicability and quantify its failure for |P|≲|Δ|. We also predict significant target-dependent deviations from the correlation limit approximation for |P|>|Δ| and |P|≲Q_{s}, which offers a straightforward test of gluon saturation and access to multigluon distributions at a future Electron-Ion Collider.
我们在色玻璃凝聚有效场论框架下研究电子 - 质子和电子 - 原子核碰撞中的包含性和衍射双喷注产生。我们分别以平均双喷注横向动量(P)和反冲动量(\Delta)，以及(P)与(\Delta)之间相对角度的各向异性来计算双喷注截面的微分。我们的结果涵盖的运动学范围比之前在关联极限近似下进行的计算所能达到的范围大得多，在关联极限近似中假设(\vert P\vert\gg\vert\Delta\vert)。我们在其适用范围内验证了该近似，并量化了(\vert P\vert\lesssim\vert\Delta\vert)时它的失效情况。我们还预测，对于(\vert P\vert>\vert\Delta\vert)和(\vert P\vert\lesssim Q_s)，会有显著的与靶相关的偏离关联极限近似的情况，这为未来电子 - 离子对撞机上的胶子饱和和多胶子分布的获取提供了一个直接的检验。
