Speaker
Description
The LHeC is the proposal to deliver electron-proton/nucleus collisions at CERN using the LHC beams and 50 GeV electrons from an Energy Recovery Linac. Initially foreseen [1] for concurrent electron-hadron/hadron-hadron operation, a standalone electron-hadron operation phase has been proposed [2] considering the current LHC schedule. Thus, the LHeC becomes a bridge from HL-LHC to the next flagship at CERN, and one of the possible projects in the 2026 Update of the ESPP [3], were the FCC-ee as plan A not feasible.
Here we review the EW and top physics 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 LHeC improved PDFs+$\alpha_s$ determination on their extraction at HL-LHC and the possibilities for determining neutral current couplings to light quarks and constraining SMEFT parameters. Concerning top physics, we present the determination of $|V_{td}|$ and $|V_{ts}|$ and of anomalous couplings, including vector, tensor $Wtb$ and anomalous $t\bar{t} \gamma$ and $t\bar{t} Z$ through, e.g., M and EDM, CP-odd top-Yukawa, and FCNC $\gamma tq$ and $Z tq$.
[1] LHeC/FCC-he Study Group, J. Phys. G 48, 110501 (2021).
[2] F. Ahmadova et al., e-Print: 2503.17727 [hep-ex].
[3] https://cds.cern.ch/record/2950671/files/CERN-ESU-2025-002.pdf?version=1.
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