论文标题
在Lepton-Nucleus散射的近近序列QCD预测未来的EIC和可能的LHEC，HE-LHEC和FCC设施
Next-to-leading order QCD predictions for dijet photoproduction in lepton-nucleus scattering at the future EIC and at possible LHeC, HE-LHeC, and FCC facilities
论文作者
论文摘要
我们使用近代触发QCD和NCTEQ15和NCTEQ15和EPPS16核parton密度功能（NLO）攻击序列（NLO）扰动顺序（NLO），计算了未来EIC和可能的LHEC HE-LHEC和可能的LHEC和FCC的电子 - 核散射中的横截面。我们对Dijet平均横向动量$ {\ bar p} _t $，平均快速度$ \barη$，观察到的核动量分数$ x_a^{\ rm obs} $和观察到的光子动量分数$x_γ^{\ rm obs} $进行预测。比较四个山谷的运动学覆盖率，我们发现从EIC到LHEC及以后的碰撞能量增加范围扩大了所有四个所考虑的变量的覆盖率。值得注意的是，LHEC和HE-LHEC将允许一个人探测Dijet Cross截面至$ x_a^{\ rm obs} \ sim 10^{ - 4} $（下调至$ x_a^{\ rm obs} \ sim 10^{ - 5} $ fcc）。 Dijet交叉部分在细胞核和质子上的比例，$σ_A/（aσ_p）$，取决于$ x_a^{\ rm obs} $，其方式与gluon密度的比例相似，$ g_a（x_a，μ^2）/g_p（x_p pys n n n n n n n n n n n n n n n n o CHAN）该地区的核阴影$ x_a^{\ rm obs} <0.01 $。因此，可以使用未来的Lepton-Nucleus colliders的Dijet光生生成来测试这一预测，并大大减少NPDF的当前不确定性。
We calculate cross sections for inclusive dijet photoproduction in electron-nucleus scattering in the kinematics of the future EIC and the possible LHeC, HE-LHeC, and the FCC using next-to-leading order (NLO) perturbative QCD and nCTEQ15 and EPPS16 nuclear parton density functions (nPDFs). We make predictions for distributions in the dijet average transverse momentum ${\bar p}_T$, the average rapidity $\barη$, the observed nuclear momentum fraction $x_A^{\rm obs}$, and the observed photon momentum fraction $x_γ^{\rm obs}$. Comparing the kinematic reaches of the four colliders, we find that an increase of the collision energy from the EIC to the LHeC and beyond extends the coverage in all four considered variables. Notably, the LHeC and HE-LHeC will allow one to probe the dijet cross section down to $x_A^{\rm obs} \sim 10^{-4}$ (down to $x_A^{\rm obs} \sim 10^{-5}$ at the FCC). The ratio of the dijet cross sections on a nucleus and the proton, $σ_A/(Aσ_p)$, depends on $x_A^{\rm obs}$ in a similar way as the ratio of gluon densities, $g_A(x_A,μ^2)/[A g_p(x_A,μ^2)]$, for which current nPDFs predict a strong suppression due to nuclear shadowing in the region $x_A^{\rm obs} < 0.01$. Dijet photoproduction at future lepton-nucleus colliders can therefore be used to test this prediction and considerably reduce the current uncertainties of nPDFs.
