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Next-to-leading order QCD corrections to s-channel single top quark production and decay at the LHC

Sarah Heim, Qing-Hong Cao, Reinhard Schwienhorst, C. -P. Yuan

Abstract

We present a study of electroweak production of top and antitop quarks in the s-channel mode at the LHC, including next-to-leading order (NLO) quantum chromodynamics (QCD) corrections to the production and decay of the single (anti)top quark. The spin is preserved in production and decay by using the narrow width approximation for the (anti)top quark. We show the effect of different O(alpha_s) contributions on the inclusive cross section and various kinematic distributions at parton level after imposing relevant kinematic cuts to select s-channel single top quark events. We also discuss several possibilities for measuring the top quark polarization.

Next-to-leading order QCD corrections to s-channel single top quark production and decay at the LHC

Abstract

We present a study of electroweak production of top and antitop quarks in the s-channel mode at the LHC, including next-to-leading order (NLO) quantum chromodynamics (QCD) corrections to the production and decay of the single (anti)top quark. The spin is preserved in production and decay by using the narrow width approximation for the (anti)top quark. We show the effect of different O(alpha_s) contributions on the inclusive cross section and various kinematic distributions at parton level after imposing relevant kinematic cuts to select s-channel single top quark events. We also discuss several possibilities for measuring the top quark polarization.

Paper Structure

This paper contains 19 sections, 6 equations, 27 figures, 5 tables.

Table of Contents

  1. Introduction
  2. Cross Section (Inclusive Rate)
  3. Inclusive cross section
  4. Top quark mass dependence and theoretical uncertainties
  5. Single top quark acceptance studies
  6. Single top quark event distributions
  7. Final state object distributions
  8. Leptons and missing transverse energy
  9. $b_{fin}$ and $b_{dec}$ jets
  10. Invariant mass M($b_{dec}$ jet, lepton)
  11. $H_{T}$ distributions
  12. Event reconstruction
  13. Kinematical and spin correlations
  14. Correlations between the $b$ jets
  15. Top quark polarization
  16. ...and 4 more sections

Figures (27)

  • Figure 1: Representative Feynman diagrams of the three single top quark production modes: t-channel (a), associated production (b) and s-channel (c).
  • Figure 2: $E_{c.m.}$ dependence of the single top (a) and antitop (b) quark production cross section for $m_{T} =$ 175, 172.5, 170 GeV.
  • Figure 3: $E_{c.m.}$ dependence of single top (a) and antitop (b) quark production cross section at NLO and leading order (LO) for $m_{T} =$ 175 GeV and ratio of cross sections for top/antitop quark production (c).
  • Figure 4: $m_t$ dependence of single top (a) and antitop (b) quark production cross section and ratio of cross sections for top/antitop quark production (c), $E_{c.m.} =$ 14 TeV.
  • Figure 5: Scale dependence of single top (a) and antitop (b) quark production cross section and ratio of cross sections for top/antitop quark production (c). $E_{c.m.} =$ 14 TeV and $m_t =$ 175 GeV.
  • ...and 22 more figures