SAIP2025

Measuring the anomalous ttZ and ttγ couplings at Future e−p colliders.

9 Jul 2025, 10:00

20m

Solomon Mahlangu House (University of the Witwatersrand, Johannesburg)

Oral Presentation Track B - Nuclear, Particle and Radiation Physics Nuclear, Particle and Radiation Physics-2

Speaker

Dr Mukesh Kumar (University of the Witwatersrand)

Description

We investigate the anomalous tt̅X couplings for neutral charged gauge boson X=Z/γ in the Standard Model (SM) and measure their precision beyond the SM in future electron-proton collider environments. The tt̅ quark pairs are produced in the neutral currents channel through the process e^- p → e^- t t̅ , for electron and proton beams of energy E_e = 60 GeV and E_p = 7 TeV respectively, at the center of mass energy of 1.3 TeV as proposed for the LHeC. The tt̅γ interaction is further probed through the photo-production process γp→t t̅ with γ scattered from the electron. We focus on the semileptonic channel where t → bW⁺, W⁺→l⁺ν_l and t̅→b̅W^-, W^-→l^-ν_l and investigate sensitive kinematic observables to these couplings. We observe that the azimuthal angular difference, ΔΦ, between the scattered electron and the l⁺ is the most sensitive observable to tt̅Z couplings. We further investigate sensitive kinematic observables to tt̅γ couplings in the photo-production process. We perform a χ² analysis at the inclusive and differential levels in the cross section to constrain the couplings.