Exploring anomalous top interactions via the final lepton in ttbar productions/decays at hadron colliders

TL;DR

This paper investigates how anomalous top-quark interactions influence the momentum distributions of final-state leptons in top-antitop production and decay at hadron colliders, aiming to identify signs of new physics.

Contribution

It derives analytical formulas for parton processes with general anomalous couplings and analyzes their effects on lepton distributions at Tevatron and LHC.

Findings

Lepton distributions are sensitive to anomalous top interactions.

Analytical formulas enable model-independent analysis.

Results help distinguish new physics effects in top sector.

Abstract

We study momentum distributions of the final-state charged lepton in ppbar/pp --> ttbar --> l^+ X (l=e or mu) at hadron colliders, i.e., Tevatron and Large Hadron Collider (LHC) in order to explore possible new-physics effects in the top-quark sector. Assuming general model-independent ttbar g + ttbar gg and tbW interactions beyond the standard model, we first derive analytical formulas for the corresponding parton-parton processes. We then compute the lepton angular, energy and transverse-momentum distributions in ppbar/pp collisions to clarify how they are affected by those anomalous couplings.