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

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

PHYSICAL REVIEW C, cilt.66, 2002 (SCI İndekslerine Giren Dergi) identifier


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.