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Electric charge is the most fundamental quantity in an electric circuit. The effects of electric charge are encountered daily, such as when a wool sweater sticks to the human body or when a person receives a shock while walking on a carpet.
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Setting Limits on Supersymmetry Using Simplified Models
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Jet charge at the LHC.

David Krohn1, Matthew D Schwartz, Tongyan Lin

  • 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA. dkrohn@physics.harvard.edu

Physical Review Letters
|June 11, 2013
PubMed
Summary
This summary is machine-generated.

Researchers can now determine the initiating parton charge of light-quark jets at the Large Hadron Collider (LHC). This method aids in testing the Standard Model and searching for new physics beyond it.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Quantum Chromodynamics

Background:

  • Determining the charge of initiating partons in light-quark jets is crucial for Standard Model tests and beyond-Standard Model (BSM) physics searches.
  • Hadronization and pileup present significant challenges to precisely measuring jet properties.

Purpose of the Study:

  • To demonstrate that a weighted sum of jet constituents' charges can effectively distinguish between jets initiated by different parton charges at the LHC.
  • To develop a robust method for calculating jet charge distributions, accounting for complex physics processes.

Main Methods:

  • Utilizing a weighted sum of the charges of a jet's constituents.
  • Combining multihadron fragmentation functions with perturbative jet functions and evolution equations.
  • Calculating moments of jet charge distributions.

Main Results:

  • A method is presented to distinguish between jets of different charges despite hadronization and pileup effects.
  • The dependence of average jet charge and its width on energy and jet size can be calculated.
  • The approach is validated to be independent of Monte Carlo fragmentation models.

Conclusions:

  • Jet charge measurements offer a powerful tool for probing electroweak quantum numbers of new particles and for Standard Model precision tests.
  • The developed theoretical framework provides a reliable method for analyzing jet charge data at the LHC.
  • This technique enhances the potential for discovering new physics and refining our understanding of the Standard Model.