论文标题
连贯的$ j/ψ$ $^4 $ He和$^3 $ HE在电子离子对撞机上的电气喷射：一次探测核阴影一个核
Coherent $J/ ψ$ electroproduction on $^4$He and $^3$He at the Electron-Ion Collider: probing nuclear shadowing one nucleon at a time
论文作者
论文摘要
虽然在小$ x $下以$ x $的小核阴影的现象已经在QCD分析中对涉及重核的各种LHC测量结果进行了确认，但到目前为止，无法通过实验建立负责在给定过程中核阴影的目标核的数量。为了解决这个问题，我们在$^4 $ HE和$^3 $上研究连贯的$ j /ψ$电力增生，他在未来的电子离子撞机的运动学中，表明此过程有能力解除与特定数量的核子$ k $相互作用的互动的贡献，尤其是在动量转移$ t $ t $ t \ neq 0。我们预测，由于$ x $和$ k $之间的非平凡相关性，差异横截面的$ t $依赖性趋于较小的$ | t | $。该计算首次使用逼真的波函数，对核阴影模型进行了严格的测试，以及对光核中胶子的3D成像的新颖探针。此外，借助此分析，可以访问有关相应散射振幅实际部分的独特信息。
While the phenomenon of gluon nuclear shadowing at small $x$ has been getting confirmation in QCD analyses of various LHC measurements involving heavy nuclei, it has not been possible so far to establish experimentally the number of target nucleons responsible for nuclear shadowing in a given process. To address this issue, we study coherent $J / ψ$ electroproduction on $^4$He and $^3$He in the kinematics of a future electron-ion collider and show that this process has the power to disentangle the contributions of the interaction with a specific number of nucleons $k$, in particular, with two nucleons at the momentum transfer $t \neq 0$. We predict a dramatic shift of the $t$-dependence of the differential cross section toward smaller values of $|t|$ due to a non-trivial correlation between $x$ and $k$. This calculation, which makes use for the first time of realistic wave functions, provides a stringent test of models of nuclear shadowing and a novel probe of the 3D imaging of gluons in light nuclei. In addition, thanks to this analysis, unique information on the real part of the corresponding scattering amplitude could be accessed.
