Top quark effective couplings from top-pair tagged photoproduction in $pe^-$ collisions

TL;DR

This paper evaluates the potential of future colliders LHeC and FCC-he to precisely measure top-quark effective couplings through detailed photoproduction analysis, surpassing current collider limits.

Contribution

It provides a comprehensive, tree-level QED analysis of top-pair photoproduction without the equivalent-photon approximation, defining new sensitivity regions for top-quark couplings.

Findings

Future colliders will set tighter bounds on top dipole moments.

Limits on the $tbW$ coupling will be comparable to HL-LHC projections.

Photoproduction regions enhance sensitivity to top-quark effective couplings.

Abstract

We present a detailed study, at the fast detector simulation level, of top-pair photoproduction in semileptonic mode at the LHeC and FCC-he future colliders. We work in full tree-level QED, not relying on the equivalent-photon approximation, taking into account the complete photoproduction kinematics. This allows us to define three photoproduction regions based on the angular acceptance range of the electron tagger. Those regions provide different degrees of sensitivity to top-quark effective couplings. We focus on the $t\bar{t}\gamma$ dipole couplings and the left-handed vector $tbW$ coupling for which we determine limits at both energies and in different photoproduction regions. We find that the LHeC and FCC-he will yield tight direct bounds on top dipole moments, greatly improving on current direct limits from hadron colliders, and direct limits on the $tbW$ coupling as restrictive as those expected from the HL-LHC. We also consider indirect limits from $b\to s \gamma$ branching ratio and $CP$ asymmetry, that are well known to be very sensitive probes of top electromagnetic dipole moments.