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The quark jet function for k T -like variables in NNLO QCD.

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Researchers developed new methods to precisely describe jet processes in particle physics. These transverse-momentum-like resolution variables improve the transition from n+1 to n jets, enhancing our understanding of hadronic final states.

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Area of Science:

  • High Energy Physics
  • Quantum Chromodynamics
  • Particle Physics

Background:

  • Precise description of jet processes is crucial for understanding hadronic final states.
  • Existing observables may not efficiently capture energy flow dynamics in multi-jet processes.

Purpose of the Study:

  • Introduce a class of transverse-momentum-like resolution variables.
  • Develop a general method for computing the quark jet function at next-to-next-to-leading order (NNLO) in perturbative Quantum Chromodynamics (pQCD).
  • Investigate the n+1 to n jet transition in multi-jet processes.

Main Methods:

  • Utilized a time-like auxiliary vector to regulate rapidity divergences.
  • Computed the quark jet function at NNLO in pQCD.
  • Applied the method to a variant of y23 in the E-scheme and WTA scheme.

Main Results:

  • Presented a novel class of resolution variables smoothly describing the n+1 to n jet transition.
  • Provided explicit NNLO calculations for the quark jet function.
  • Demonstrated the applicability of the method in different theoretical schemes.

Conclusions:

  • The developed observables offer improved precision for describing jet physics.
  • The computational method provides a robust tool for theoretical calculations in pQCD.
  • These advancements contribute to a more accurate understanding of multi-jet dynamics.