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First Measurement of Timelike Compton Scattering.

P Chatagnon1, S Niccolai1, S Stepanyan2

  • 1Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France.

Physical Review Letters
|January 14, 2022
PubMed
Summary
This summary is machine-generated.

This study reports the first measurement of timelike Compton scattering using the CLAS12 detector. The results offer new insights into generalized parton distributions and Compton form factors.

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Area of Science:

  • Nuclear Physics
  • Particle Physics
  • Quantum Chromodynamics

Background:

  • Generalized Parton Distributions (GPDs) are crucial for understanding the structure of the nucleon.
  • Timelike Compton Scattering (TCS) provides a unique probe of GPDs, complementing spacelike experiments.
  • Previous experimental data on TCS were limited, hindering detailed studies of GPDs.

Purpose of the Study:

  • To present the first measurement of the timelike Compton scattering (TCS) process: γp→p^{'}γ^{*}(γ^{*}→e^{+}e^{-}).
  • To measure the photon beam polarization asymmetry and decay lepton angular asymmetries in TCS.
  • To probe the imaginary and real parts of Compton form factors and test GPD universality.

Main Methods:

  • Utilized the CLAS12 detector at Jefferson Lab for data acquisition.
  • Employed a high-intensity photon beam incident on a proton target.
  • Analyzed the decay products of the virtual photon (e^{+}e^{-}) to reconstruct the TCS process.

Main Results:

  • Reported measurements of TCS in the range of timelike photon virtualities 2.25
  • Presented the photon beam polarization asymmetry, sensitive to the imaginary part of Compton form factors.
  • Measured the decay lepton angular asymmetry, accessing the real part of Compton form factors.

Conclusions:

  • The results provide crucial data for constraining Generalized Parton Distributions (GPDs).
  • The measurements offer a new avenue to test the universality of GPDs.
  • This study advances our understanding of the nucleon's internal structure through the TCS process.