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Area of Science:

  • High Energy Physics
  • Quantum Chromodynamics
  • Collider Physics

Background:

  • The Large Hadron Collider (LHC) facilitates studies of fundamental particle interactions.
  • Understanding particle production, such as Z boson, Higgs boson, and di-jet events, is crucial for testing the Standard Model.
  • Jet substructure and cross-section measurements are sensitive probes of Quantum Chromodynamics (QCD).

Purpose of the Study:

  • To conduct a phenomenological study of Z plus jet, Higgs plus jet, and di-jet production at the LHC.
  • To investigate the dependence of the leading jet cross section on jet radius and transverse momentum.
  • To improve theoretical predictions and assess uncertainties in jet measurements.

Main Methods:

  • Utilizing perturbative QCD calculations at next-to-leading order (NLO) and next-to-next-to-leading order (NNLO).
  • Employing a range of renormalization and factorization scales to evaluate theoretical uncertainties.
  • Comparing fixed-order predictions with matched NLO calculations to parton showers.
  • Estimating non-perturbative corrections using different event generators.

Main Results:

  • The leading jet cross section shows a dependence on jet radius, varying with jet transverse momentum.
  • Scale dependence studies provide refined estimates of theoretical uncertainties, particularly for smaller jet sizes.
  • Comparisons between fixed-order and matched parton shower calculations reveal differences in predictions.

Conclusions:

  • The study provides crucial insights into the behavior of jet production at the LHC.
  • Results offer improved methods for estimating theoretical uncertainties in jet physics.
  • Findings contribute to a more precise understanding of particle interactions and the underlying theory of strong interactions.