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

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Dersch,  U.
Prof. Bogdan Povh, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Engelfried,  J.
Prof. Bogdan Povh, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Eschrich,  I.
Prof. Bogdan Povh, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Konorov,  I.
Prof. Bogdan Povh, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Kruger,  H.
Ralf Srama - Heidelberg Dust Group, Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Povh,  B.
Prof. Bogdan Povh, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Vorwalter,  K.
Prof. Bogdan Povh, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Citation

Ocherashvili, A., Alkhazov, G., Atamantchouk, A. G., Balatz, M. Y., Bondar, N. F., Cooper, P. S., et al. (2002). First measurement of pi(-)e ->pi(-)e gamma pion virtual compton scattering. Physical Review C, 66(3): 034613, pp. 034613-034613.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-82B2-F
Abstract
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.