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Measurement of differential $t$-channel production cross-sections of single top quarks and top antiquarks at $\sqrt{s}=13$ TeV with the ATLAS detector

Lukas Kretschmann

Abstract

The differential production cross-sections of single top quarks and top antiquarks produced via the $t$-channel process are measured in proton-proton collisions at $\sqrt{s}=13$ TeV at the LHC with the full Run 2 ATLAS dataset corresponding to an integrated luminosity of $140$ fb$^{-1}$. The cross-sections are measured as a function of the transverse momentum and absolute rapidity of the top quark ($tq$) and top antiquark ($\bar{t}q$) at parton level. In addition, for the first time, the differential ratio of the $tq$ to $\bar{t}q$ cross-sections is presented. The results are compared to theoretical predictions from fixed-order calculations, various event generators, and different PDF sets. An interpretation in the framework of an effective field theory (EFT) is performed to constrain the Wilson coefficient $C^{3,1}_{Qq}$ of the four-fermion operator.

Measurement of differential $t$-channel production cross-sections of single top quarks and top antiquarks at $\sqrt{s}=13$ TeV with the ATLAS detector

Abstract

The differential production cross-sections of single top quarks and top antiquarks produced via the -channel process are measured in proton-proton collisions at TeV at the LHC with the full Run 2 ATLAS dataset corresponding to an integrated luminosity of fb. The cross-sections are measured as a function of the transverse momentum and absolute rapidity of the top quark () and top antiquark () at parton level. In addition, for the first time, the differential ratio of the to cross-sections is presented. The results are compared to theoretical predictions from fixed-order calculations, various event generators, and different PDF sets. An interpretation in the framework of an effective field theory (EFT) is performed to constrain the Wilson coefficient of the four-fermion operator.

Paper Structure

This paper contains 5 sections, 3 equations, 2 figures.

Table of Contents

  1. Introduction
  2. Analysis strategy
  3. Results
  4. EFT interpretation
  5. Conclusion

Figures (2)

  • Figure 1: The \ref{['fig:pt_main']} normalised differential $tq$ production cross-section and corresponding ratio to theory prediction as a function of $p_\text{T}(t)$compared to theoretical predictions from different MC generators and \ref{['fig:pt_ratio']} the differential cross-section ratio as a function of $p_\text{T}(t)$ compared to fixed-order with MCFM Campbell:2020fhf. The figures are both from ATLAS:2025vtm.
  • Figure 2: The \ref{['fig:y_main']} normalised differential $tq$ production cross-section and corresponding ratio to theory prediction as a function of $|y(t)|$ compared to theoretical predictions from different PDFs and \ref{['fig:y_total']} the differential cross-section as a function of $|y(t)|$ compared to fixed-order with MCFM. The figures are both from ATLAS:2025vtm.