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arXiv 2011.04711hep-ph
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在EIC上产生高$|t|$衍射矢量介子

High $|t|$ diffractive vector meson production at the EIC

Michal Deak, Anna M. Stasto, Mark Strikman

摘要:

本文研究了在未来的电子-质子对撞机上,在大动量转移$|t|$中衍射产生$J/ψ$介子的前景。特别是,我们专注于测量的快度间隙的大小。用于计算的模型是基于Balitsky-Fadin-Kuraev-Lipatov微扰Pomeron的衍射交换。计算的横截面和估计率假设的积分亮度$10 \, \rm fb^{-1}$提供。两个实验策略被认为是。第一,通过观察中央探测器前向部分的活动直接测量快度间隙大小,第二,在探测器不能测量前向活动的情况下,对快度间隙大小设定下限。我们发现,在EIC测量截面对快度间隙间隔的依赖性是可能的,快度间隙间隔可达四个单位。这应允许测量由于BFKL交换而预期的截面变化因子1.6。这是可能的,与目前的设置的检测器,项目的覆盖范围高达3.5个单位的速度。然而,我们的结论是,探测器的扩展到更高的快度,例如4.5将是可取的,并提供更好的杠杆臂测试在EIC的快度间隙物理。

英文摘要:

We investigate the prospects of the diffractive production of $J/ψ$ mesons at large momentum transfer $|t|$ at the future Electron Ion Collider in electron-proton collisions. In particular, we focus on the measurements of the rapidity gap size. The model used for the calculations is based on the diffractive exchange of the Balitsky-Fadin-Kuraev-Lipatov perturbative Pomeron. Calculations for the cross section and the estimates for the rates assuming integrated luminosity of $10 \, \rm fb^{-1}$ are provided. Two experimental strategies were considered. First, measuring the rapidity gap size directly, by observing the activity in the forward part of the central detector, and second by putting a lower limit on the rapidity gap size in the case when the detector cannot measure forward activity. We find that, it is possible to measure at the EIC the dependence of the cross section on rapidity gap interval up to four units in rapidity. This should allow to measure the change of the cross section by a factor 1.6 expected due to the BFKL exchange. This is possible with the present setup of the detector which projects the coverage up to 3.5 units of rapidity. We conclude however, that the extension of the detector up to higher rapidity, for example to 4.5 would be desirable and provide even better lever arm for testing rapidity gap physics at the EIC.

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