Measurement of the leptoquark Yukawa couplings in e+e- collisions at TESLA

TL;DR

This study explores how TESLA e+e- collisions can precisely measure first-generation leptoquark Yukawa couplings, surpassing LHC sensitivity and distinguishing coupling chiralities even near production thresholds.

Contribution

It demonstrates the potential for high-precision measurement of leptoquark Yukawa couplings at TESLA, including sensitivity to very small couplings and chirality distinctions.

Findings

Yukawa couplings can be measured with a few percent precision.

TESLA can detect very small couplings down to lambda ~ 0.05.

Distinction between left- and right-handed couplings is feasible near kinematic limits.

Abstract

Measurement of the Yukawa couplings of the first-generation leptoquarks has been studied for e+e- collisions at TESLA, at sqrt(s)=800 GeV. By combining measurements from different production and decay channels, determination of Yukawa couplings with precision on the few per-cent level is possible. TESLA will be sensitive to very small leptoquark Yukawa couplings not accessible at LHC, down to lambda ~ 0.05 [e]. Distinction between left-handed and right-handed Yukawa couplings is feasible even for leptoquark masses very close to the pair-production kinematic limit.