Measurement of the differential single-top-quark t-channel production cross section at √s = 13 TeV with the ATLAS detector / Maren Stratmann. Wuppertal, June 2026
Inhalt
- Introduction
- 1 Standard Model of particle physics
- 1.1 Theoretical formulation
- 1.2 Scattering amplitudes and Feynman diagrams
- 1.3 Quantum chromodynamics
- 1.4 The electroweak interaction
- 1.5 The Higgs mechanism
- 1.6 Experimental validation
- 1.7 Limitations
- 1.8 Extension through effective field theory
- 2 The ATLAS detector at the Large Hadron Collider
- 3 The top quark at the LHC
- 4 Simulation of proton-proton collisions
- 4.1 Modelling of the proton substructure
- 4.2 Hard scattering and parton shower
- 4.3 Detector simulation and pileup overlay
- 4.4 Proton PDF sets
- 4.5 Event generators and fixed-order calculations
- 5 Data and simulated samples
- 5.1 Signal samples
- 5.2 Top-quark background samples
- 5.3 Boson background samples
- 5.4 Multijet background samples
- 6 Object reconstruction and identification
- 6.1 ID tracks and vertices
- 6.2 Topological clusters
- 6.3 Electrons
- 6.4 Muons
- 6.5 Jets
- 6.6 Flavour tagging
- 6.7 Overlap removal
- 6.8 Missing transverse momentum
- 7 Event selection and top-quark reconstruction
- 8 Background estimation
- 8.1 MC simulated backgrounds
- 8.2 The multijet background
- 8.3 Estimation of the background rate
- 8.4 Event yields and data/MC comparisons in the signal regions
- 9 The unfolding method
- 9.1 Theoretical background
- 9.2 Binning of the observables
- 9.3 Unfolding corrections
- 9.4 Validation of the unfolding method
- 10 Uncertainties in the measurement
- 11 Results
- Conclusion and outlook
- Appendices
- A Cross sections of the EFT signal samples
- B Background estimate
- C Event selection
- C.1 Angular cut
- C.2 NN input variables
- C.3 Pseudorapidity of the light jet
- C.4 Background composition for different Dnn requirements
- D Unfolding corrections
- D.1 Binning of the observables
- D.2 Shape of the pT(t) and pT(siunitxunit-deprecatedࡡ爀戀愀爀戀愀爀琀⤀ 猀攀氀攀挀琀椀漀渀 攀昀昀椀挀椀攀渀挀椀攀
- E Unfolding validation
- F Systematic uncertainties
- F.1 Short description of all considered uncertainties
- F.2 Impact of individual uncertainties
- F.3 Signal modelling breakdown plots
- F.4 Experimental uncertainties breakdown plots
- F.5 Impact of signal modelling on the number of jets
- F.6 Statistical uncertainty in systematic variations
- F.7 Covariance matrices
- F.8 Correlation matrices
- G Results
- Bibliography
- Acknowledgements