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Unique Access to u-Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction.

W B Li1,2, G M Huber1, H P Blok3,4

  • 1University of Regina, Regina, Saskatchewan S4S 0A2, Canada.

Physical Review Letters
|November 26, 2019
PubMed
Summary

This study reveals a new peak in backward-angle meson electroproduction, offering novel insights into the nucleon

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Area of Science:

  • Nuclear Physics
  • Particle Physics

Background:

  • Previously unexplored backward-angle meson electroproduction offers unique access to nucleon structure.
  • Understanding the three quark plus sea component of the nucleon wave function is crucial.

Purpose of the Study:

  • To present the first complete separation of electromagnetic structure functions in exclusive omega electroproduction off the proton.
  • To explore the physics of backward-angle electroproduction above the resonance region.

Main Methods:

  • Exclusive omega electroproduction (ep→e'pω) was analyzed.
  • Measurements were performed at Q² values of 1.60 and 2.45 GeV² and W=2.21 GeV.
  • Complete separation of four electromagnetic structure functions (σL, σT, σLT, σTT) was achieved.

Main Results:

  • An unanticipated backward-angle cross section peak was observed.
  • Full separation of structure functions was demonstrated in this new kinematic region.
  • Dominance of σT over σL at Q²=2.45 GeV² was found, consistent with collinear QCD predictions.

Conclusions:

  • Backward-angle electroproduction provides access to universal nonperturbative objects (transition distribution amplitudes).
  • The findings support factorization in the near-backward regime, linking scattering amplitudes to QCD descriptions.
  • This research opens a new avenue for probing nucleon structure via transition distribution amplitudes.