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Setting Limits on Supersymmetry Using Simplified Models
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Rosenbluth Separation of the π^{0} Electroproduction Cross Section.

M Defurne1, M Mazouz2, Z Ahmed3

  • 1Irfu, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France.

Physical Review Letters
|January 7, 2017
PubMed
Summary
This summary is machine-generated.

Deeply virtual neutral pion electroproduction measurements show the cross section is dominated by the transverse component, deviating from perturbative quantum chromodynamics predictions. The results support accessing transversity generalized parton distributions (GPDs) through this process.

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Area of Science:

  • Nuclear Physics
  • Particle Physics
  • Quantum Chromodynamics

Background:

  • Deeply virtual pion electroproduction probes the internal structure of nucleons.
  • Generalized Parton Distributions (GPDs) offer a framework to understand nucleon structure.
  • Previous measurements provide context for interpreting new cross-section data.

Purpose of the Study:

  • Measure deeply virtual neutral pion electroproduction cross-sections.
  • Separate longitudinal and transverse response functions.
  • Compare experimental results with theoretical models based on GPDs.

Main Methods:

  • Jefferson Lab Hall A experiment E07-007.
  • Rosenbluth technique for separating longitudinal and transverse responses.
  • Analysis of cross-section data at x_{B}=0.36 and Q^{2} from 1.5 to 2 GeV^{2}.

Main Results:

  • The cross section is predominantly transverse, differing from asymptotic perturbative quantum chromodynamics predictions.
  • A non-zero longitudinal contribution is indicated by the measured interference term σ_{LT}.
  • Good agreement is found with models incorporating chiral-odd transversity GPDs and twist-3 pion distribution amplitudes.

Conclusions:

  • Transversity GPDs can be accessed through neutral pion electroproduction at high Q^{2}.
  • The experiment provides strong support for the GPDs approach to nucleon structure.
  • The findings advance the understanding of the nucleon's partonic structure.