arXiv 1003.21962010-03-10nucl-exhep-ex

电子-离子对撞机中旁观者碎片的作用

The role of Spectator Fragments at an electron Ion collider

Sebastian White, Mark Strikman

备注：: 10 pages, 6 figures

摘要：

观众碎片的有效检测是电子-离子对撞机（eIC）的关键。任何导致碎片或$γ$发射的过程都会破坏衍射过程中的相干性。因此，这相当于pp碰撞中未检测到快度间隙。例如，在矢量介子的相干光生过程中，它们的4-动量转移分布会像霍夫施塔特用$\sim$ 100 MeV电子的弹性散射测量其电荷结构一样，在核中成像“胶子电荷”。虽然他可以测量电子由于核能能级激发而导致的$\sim$ 4 MeV能量损失（图1），但即使入射束的能量扩散也会阻止eIC中准弹性事件的这种包容性选择。唯一可用的工具是碎片检测。由于在我们的示例中，人们发现去激发的$\sim100$经过$γ$或1个中子，很少经过2个中子，并且从不经过质子（由于库仑势垒抑制），因此eIC设计应该强调它们的检测。

英文摘要：

Efficient detection of spectator fragments is key to the main topics at an electron-ion collider (eIC). Any process which leads to emission of fragments or $γ$'s breaks coherence in diffractive processes. Therefore this is equivalent to non-detection of rapidity gaps in pp collisions. For example, in coherent photoproduction of vector mesons their 4-momentum transfer distribution would image the "gluon charge" in the nucleus in the same way that Hofstadter measured its charge structure using elastic scattering of $\sim$100 MeV electrons. Whereas he could measure the $\sim$4 MeV energy loss by the electron due to excitation of nuclear energy levels (Figure 1), even the energy spread of the incident beam would prevent such an inclusive selection of quasielastic events at an eIC. The only available tool is fragment detection. Since, in our example, one finds that $\sim100$ of deexcitations go through $γ$'s or 1 neutron, rarely to 2 neutron and never to protons(due to Coulomb barrier suppression), the eIC design should emphasize their detection.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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