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arXiv 2007.11799hep-phhep-ex
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LHeC深非弹性散射中的电弱物理

Electroweak Physics in Inclusive Deep Inelastic Scattering at the LHeC

Daniel Britzger, Max Klein, Hubert Spiesberger

摘要:

拟议中的电子质子对撞机LHeC是一个独特的设施,电弱相互作用可以研究一个非常高的精度在很大程度上未开发的类空动量转移的运动学制度。我们模拟了包括中性和带电电流深非弹性轻子质子散射截面数据在1.2和1.3 TeV的质量中心的能量,包括其系统的不确定性。基于电弱物理参数和部分子分布函数的同时拟合,我们估计了标准模型参数的不确定度以及一些描述标准模型以外物理的参数,例如斜参数$S$,$T$,和$U$ .对于轻夸克与$Z$玻色子($g_{A/V}^{u/d}$)的弱中性流耦合的测量,预计将达到前所未有的亚百分比水平的精度,将其目前的精度提高一个数量级以上。弱混合角可以用大约$Δ\sin^2θ_\textrm{W} = \pm 0.00015$的精度来确定,并且其尺度依赖性可以在大约25和700 GeV之间的范围内进行研究。在壳层上方案中,$W$ -玻色子质量的间接测定是可能的,实验不确定度下降到$Δm_{W}=\pm6\,\textrm{MeV}$。我们讨论了如何在深非弹性散射的测量的不确定性比较与那些从类时域的测量,例如在$Z$极,以及哪些方面的电弱相互作用是唯一的测量在LHeC,例如电弱参数在带电电流相互作用。我们的结论是,LHeC将确定电弱物理参数,在类空区域,以前所未有的精度导致标准模型的彻底测试,并可能超越。

英文摘要:

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.

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