论文标题
在LHEC的包含深度非弹性散射中的Electroweak Physics
Electroweak Physics in Inclusive Deep Inelastic Scattering at the LHeC
论文作者
论文摘要
拟议的电子普罗顿对撞机LHEC是一个独特的设施，可以在该设施中以很高的精度进行静电的相互作用，这在很大程度上未开发的空中动量转移的运动学方向上。我们已经模拟了包含的中性和带电的深度弹性Lepton Proton散射横截面数据，其中包括其系统的不确定性，包括1.2和1.3 TEV。基于Electroweak物理参数和Parton分布功能的同时拟合，我们估计标准模型参数的不确定性以及描述标准模型以外物理的许多参数，例如斜参数$ s $ s $，$ t $和$ u $。预计在次级水平上的前所未有的精度可用于测量光夸克的弱中性耦合到$ z $ boson，$ g_ {a/v}^{u/d/d} $，将目前的精度提高了不超过量的阶数。弱混合角可以用大约$δ\ sin^2θ_\ textrm {w} = \ pm 0.00015 $确定，并且可以在大约25至700 GEV之间研究其比例依赖性。可以在壳体方案中对$ W $ -BOSON质量的间接确定，实验性不确定性降低到$Δm_{w} = \ pm6 \，\ textrm {mev} $。我们讨论了深弹性散射中此类测量值的不确定性与及时域中的测量结果相比，例如在$ z $ - peL，以及electroweak互动的哪些方面是LHEC的测量值，例如电动电流相互作用中的electroweak参数。我们得出的结论是，LHEC将确定超空区域的Electroweak物理参数，并具有前所未有的精度，从而彻底测试了标准模型，甚至可能是超越的。
The proposed electron-proton collider LHeC is a unique facility where electroweak interactions can be studied with a very high precision in a largely unexplored kinematic regime of spacelike momentum transfer. We have simulated inclusive neutral- and charged-current deep-inelastic lepton proton scattering cross section data at center-of-mass energies of 1.2 and 1.3 TeV including their systematic uncertainties. Based on simultaneous fits of electroweak physics parameters and parton distribution functions, we estimate the uncertainties of Standard Model parameters as well as a number of parameters describing physics beyond the Standard Model, for instance the oblique parameters $S$, $T$, and $U$. An unprecedented precision at the sub-percent level is expected for the measurement of the weak neutral-current couplings of the light-quarks to the $Z$ boson, $g_{A/V}^{u/d}$, improving their present precision by more than an order of magnitude. The weak mixing angle can be determined with a precision of about $Δ\sin^2θ_\textrm{W} = \pm 0.00015$, and its scale dependence can be studied in the range between about 25 and 700 GeV. An indirect determination of the $W$-boson mass in the on-shell scheme is possible with an experimental uncertainty down to $Δm_{W}=\pm6\,\textrm{MeV}$. We discuss how the uncertainties of such measurements in deep-inelastic scattering compare with those from measurements in the timelike domain, e.g. at the $Z$-pole, and which aspects of the electroweak interaction are unique to measurements at the LHeC, for instance electroweak parameters in charged-current interactions. We conclude that the LHeC will determine electroweak physics parameters, in the spacelike region, with unprecedented precision leading to thorough tests of the Standard Model and possibly beyond.
