Speaker
Description
The Large Hadron electron Collider (LHeC) is the proposal to deliver electron-proton/nucleus collisions at CERN using the LHC beams and a 50 GeV electron beam from an Energy Recovery Linac. While initially foreseen [1] for concurrent electron-hadron and hadron-hadron operation, a standalone electron-hadron operation phase has been proposed [2] in view of the current LHC schedule. Thus, the LHeC becomes a bridge from the HL-LHC to the next flagship at CERN, and one of the possible projects in the 2026 Update of the European Strategy for Particle Physics [3], were the FCC-ee as plan A not feasible.
In this talk we review the EW and top physics studies at the LHeC. We present new results on the extraction of the Weinberg angle and top, Z and W masses, together with the impact of the improved determination of PDFs+$\alpha_s$ at the LHeC on their extraction at the HL-LHC. We also present the possibilities for the determination of neutral current vector and axial couplings to light quarks, and for constraining parameters in SMEFT analyses. Concerning top physics, we present the determination of $|V_{td}|$ and $|V_{ts}|$ and of anomalous couplings, including vector- and tensor $Wtb$ couplings, anomalous $t\bar{t} \gamma$ and $t\bar{t} Z$ couplings through, for example, magnetic and electric dipole moments, CP-odd top-Yukawa couplings, and FCNC $\gamma tq$ and $Z tq$ couplings.
[1] P. Agostini et al. (LHeC/FCC-he Study Group), J. Phys. G 48, 110501 (2021), arXiv:2007.14491 [hep-ex].
[2] F. Ahmadova et al., e-Print: 2503.17727 [hep-ex].
[3] The European Strategy for Particle Physics: 2026 Update - Recommendations by the European Strategy Group, https://cds.cern.ch/record/2950671/files/CERN-ESU-2025-002.pdf?version=1.
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