Year: 2025
Type: article
Abstract: We study the consequences for top-quark physics of having electron and positron beams available at the LHeC and FCC-he, as was the case in HERA. We show that the asymmetry between top production in $$pe^+$$ p e + collisions and antitop production in $$pe^-$$ p e - reactions is sensitive to $$|V_{td}|$$ | V td | . By means of detailed parton-level Monte Carlo simulations of single t and $$\bar{t}$$ t ¯ production and its backgrounds, we parametrize the asymmetry dependence on $$|V_{td}|$$ | V td | and estimate its uncertainties. Our analysis includes realistic phase-space cuts and machine-learning binary classifiers for background rejection. We thus obtain limits on $$|V_{td}|$$ | V td | that are substantially stronger than current ones and also smaller than current projections for the HL-LHC. We have $$|V_{td}| < 1.6\times |V_{td}^{\textrm{PDG}}|$$ | V td | < 1.6 × | V td PDG | at the LHeC, at 68% C.L. with $$L_{\textrm{int}}=2$$ L int = 2 /ab.
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,890
OpenAlex ID: W4407590688