Abstract
We present a phenomenological study of the single top (anti-)quark production with leptonic decays at the Large Hadron electron Collider (LHeC) at the next-to-leading-order (NLO) in QCD. We focus on various differential distributions in a fiducial region. The NLO corrections can reduce the fiducial cross section by 14%. We find the NLO predictions exhibit strong stability under scale variations for most observables considered while the scale variations at the leading-order (LO) dominated in the theoretical uncertainties. We propose a method of determining the top-quark mass using the measurement of the average transverse momentum of the charged lepton. The scale variations at the NLO induce a theoretical uncertainty of about 1.3 GeV of the extracted top-quark mass. The statistical error of the extracted top-quark mass amounts to 1.1 GeV. We also investigate the impact of the QCD corrections and the scale variations in searches of the anomalous Wtb couplings.
Highlights
The Large Hadron Electron Collider (LHeC) [1,2,3] is a proposed facility for using a newly built electron beam of 60 GeV or higher energy to collide with the intense hadron beams of the LHC
We present a phenomenological study of the single topquark production with leptonic decays at the Large Hadron Electron Collider at next-to-leading order (NLO) in QCD
We find that the NLO predictions exhibit strong stability under scale variations for most observables considered, while the scale variations at leading order dominate in the theoretical uncertainties
Summary
The Large Hadron Electron Collider (LHeC) [1,2,3] is a proposed facility for using a newly built electron beam of 60 GeV or higher energy to collide with the intense hadron beams of the LHC. For the LHeC, single top quark production via chargedcurrent DIS is dominant in all the top quark production channels We can utilize this unprecedented facility to measure the precise properties of the top quark and search for new physics. We show their impact on the precision measurement of the top quark mass and the searches of the anomalous Wtb couplings.
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