Speaker
Description
The 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 ESPP [3], were the FCC-ee as plan A not feasible.
In this talk we review the Higgs physics studies at the LHeC. We present the standalone determination of the Higgs couplings. We then explore the impact of the improved extraction of PDFs+$\alpha_s$ at the LHeC on Higgs coupling determination at the HL-LHC, as well as the implications on the Higgs mass extracted in EW fits, and on the cross section through gluon-gluon fusion. We finally discuss the comparison of the extraction of couplings in different combinations of future accelerators, highlighting the role of the combination HL-LHC+LHeC.
[1] 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] https://cds.cern.ch/record/2950671/files/CERN-ESU-2025-002.pdf?version=1.
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