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.
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
Sensitivity prospects for lepton-trijet signals in the $ν$SMEFT at the LHeC
Instituto de Física de Mar del Plata (IFIMAR) CONICET, UNMDP(马德普拉塔物理研究所 (IFIMAR) 阿根廷国家科学研究委员会,马德普拉塔国立大学);Instituto de Física La Plata (IFLP) CONICET, UNLP(拉普拉塔物理研究所 (IFLP) 阿根廷国家科学研究委员会,拉普拉塔国立大学);Instituto de Física, Facultad Ingeniería, Universidad de la República(共和国大学工程学院物理研究所);Departamento de Física, Universidad Nacional de Mar del Plata(马德普拉塔国立大学物理系);Instituto de Física, Facultad de Ciencias, Universidad de la República(共和国大学理学院物理研究所)
Università di Padova(帕多瓦大学);INFN, Sezione di Padova(意大利国家核物理研究所帕多瓦分部);CERN(欧洲核子研究中心);Albert-Ludwigs-Universität Freiburg(弗莱堡大学);PSI Center for Neutron and Muon Sciences(瑞士保罗谢尔研究所中子与μ子科学中心)
Probing the trilinear Higgs boson self-coupling via single Higgs production at the LHeC
希格斯粒子自耦合的确定是理解电弱对称性破缺背后机制的关键因素之一。为了避免双Higgs产生研究的缺点,提出了一种通过单Higgs次领先级(NLO)产生来间接约束Higgs三线性自耦合的方法.本文研究了未来LHeC中通过矢量玻色子融合(VBF)过程$e^{-} p \to ν_{e} h j$的Higgs自相互作用。在非线性光学水平上,我们解析地计算了相关过程的散射振幅,特别是由Higgs自相互作用引起的散射振幅。然后利用分析结果对Higgs通过VBF产生和衰变到$b\bar{b}$的过程进行了蒙特卡罗模拟和统计分析,得到三线性Higgs自耦合重标度参数$κ_λ$与$2~\text{ab}^{-1}$积分亮度的极限[-0.57,2.98]。如果我们假设大约10%的信号在事件选择切割中幸存下来,并且包括所有的背景,则约束将扩展到[-2.11,4.63]。
The Large Hadron electron Collider as a bridge project for CERN
CERN(欧洲核子研究中心);University of Oxford(牛津大学);Nikhef(荷兰国家核物理与粒子物理研究所);University of Liverpool(利物浦大学);University of Cambridge(剑桥大学);University of Helsinki(赫尔辛基大学);University of the Witwatersrand(威特沃特斯兰德大学);iThemba LABS(iThemba实验室);University of Birmingham(伯明翰大学);Southern Methodist University(南方卫理公会大学);Penn State University(宾夕法尼亚州立大学);Kobe University(神户大学)
Ab initio study of $\boldsymbol{(ν_\ell,\ell^-)}$ and $\boldsymbol{(\overlineν_\ell,\ell^+)}$ inclusive scattering in $^{12}$C: confronting the MiniBooNE and T2K CCQE data
Nuclear Many-Body Theory of Electroweak Interactions with Nuclei at Intermediate Energies
将文献\cite{GNO97}中的核包容电子模型的准弹性(QE)贡献推广到研究电弱荷电电流(CC)引起的中能核反应,为将来的中微子振荡实验提供理论依据.长程核关联(RPA),最终状态相互作用(FSI)和库仑修正包括在模型中。RPA的相关性在整个中微子能量范围内发挥着至关重要的作用,高达500兆电子伏,在这项工作中研究。通过元素周期表和反应$^{12}$ C $(ν_μ,μ^-)X$和$^{12}$ C $(ν_e,e^-)X$阈值附近的包容μ子捕获的预测也给出了。
Probing Electroweak Baryogenesis induced by extra bottom Yukawa coupling via EDMs and collider signatures
我们研究了在一般的双Higgs模型中电偶极矩(EDM)测量和对撞机实验中探测由额外的底Yukawa耦合$ρ_{bb}$驱动的电弱重子生成的前景。参数空间接收有意义的约束,从125 GeV的希格斯$h$玻色子信号强度测量,以及几个重希格斯玻色子搜索在大型强子对撞机(LHC)。此外,我们表明,CP不对称的包容性$B\to X_s γ$衰变的不对称性将提供互补的探针。如果$|ρ_{bb}|\sim 0.15$和$250~\mbox{GeV}\lesssim m_A \lesssim 350$ GeV,其中$A$是CP奇数标量,则可以在LHC通过$bg\to bA \to b Z h$过程进行发现。对于$m_A> 2 m_t$阈值,其中$m_t$是顶夸克质量,如果额外的顶汤川耦合$|ρ_{tt}|\sim0.5$,也可以在高亮度LHC运行中发现$bg\to bA \to b t \bar t$,尽管它可能受到系统不确定性的影响。为了完整性,我们研究了$gg\to t \bar t A \to t \bar t b \bar b $,但发现它没有前途。
将核物理A627(1997)543中的核包容电子散射模型的准弹性(QE)贡献推广到研究电弱荷电电流(CC)诱导的核反应,在未来的中微子振荡实验中感兴趣的中能区.该模型占,除其他核效应,远程核(RPA)的相关性,最终状态相互作用(FSI)和库仑修正。对$^{12}$ C中的μ子俘获和阈附近的反应$^{12}$ C $(ν_μ,μ^-)X$也给出了预言。RPA的相关性被证明发挥了至关重要的作用,他们的列入导致一个最好的现有的同时描述这两个过程,精度的顺序为百分之10- 15的μ子捕获率,甚至更好的LSND测量。