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Measuring Sub-23 Nanometer Real Driving Particle Number Emissions Using the Portable DownToTen Sampling System
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Parton Showers beyond Leading Logarithmic Accuracy.

Mrinal Dasgupta1, Frédéric A Dreyer2, Keith Hamilton3

  • 1Consortium for Fundamental Physics, School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom.

Physical Review Letters
|August 16, 2020
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Summary
This summary is machine-generated.

New parton shower methods achieve next-to-leading logarithmic accuracy, improving precision in collider physics. These advancements overcome limitations of previous leading-logarithmic order tools for crucial physics applications.

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Area of Science:

  • High-energy particle physics
  • Quantum chromodynamics
  • Collider physics

Background:

  • Parton showers are essential tools in collider physics but are limited to leading logarithmic accuracy.
  • This limitation restricts their applicability in various physics domains.
  • Achieving higher accuracy is crucial for precise theoretical predictions.

Purpose of the Study:

  • To define criteria for next-to-leading logarithmic (NLL) accurate parton showers.
  • To introduce new parton shower classes that meet these NLL criteria.
  • To validate the accuracy of these new showers against analytical calculations.

Main Methods:

  • Proposed formal criteria for NLL accuracy in parton showers.
  • Developed new parton shower algorithms for final-state radiation.
  • Focused on the large-N_{C} limit for practical implementation.
  • Compared shower predictions with all-order analytical NLL calculations.

Main Results:

  • Established clear criteria for NLL accurate parton showers.
  • Introduced novel parton shower classes satisfying key NLL criteria in the large-N_{C} limit.
  • Demonstrated agreement between the new showers and analytical NLL calculations for various observables.
  • Achieved NLL accuracy in a parton shower for the first time.

Conclusions:

  • The proposed parton showers represent a significant advancement in theoretical precision for collider physics.
  • These new showers overcome previous accuracy limitations, enabling more reliable predictions.
  • The demonstrated agreement with analytical calculations validates the new approach for future research.