First measurement of pi(-)e ->pi(-)e gamma pion virtual compton scattering

Ocherashvili A., Alkhazov G., Atamantchouk A., Balatz M., Bondar N., Cooper P., ...More

PHYSICAL REVIEW C, vol.66, no.3, 2002 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 66 Issue: 3
  • Publication Date: 2002
  • Doi Number: 10.1103/physrevc.66.034613
  • Journal Name: PHYSICAL REVIEW C
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED)
  • Istanbul University Affiliated: No


Pion virtual compton scattering (VCS) via the reaction pi(-)e-->pi(-)egamma was observed in the Fermilab E781 SELEX experiment. SELEX used a 600 GeV/c pi(-) beam incident on target atomic electrons, detecting the incident pi(-) and the final state pi(-), electron and gamma. Theoretical predictions based on chiral perturbation theory are incorporated into a Monte Carlo simulation of the experiment and are compared to the data. The number of reconstructed events (=9) and their distribution with respect to the kinematic variables (for the kinematic region studied) are in reasonable accord with the predictions. The corresponding pi(-) VCS experimental cross section is sigma=38.8+/-13 nb, in agreement with the theoretical expectation of sigma=34.7 nb.