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

Ocherashvili, A.; Alkhazov, G.; Atamantchouk, A. G.; Balatz, M. Y.; Bondar, N. F.; Cooper, P. S.; Dauwe, L. J.; Davidenko, G. V.; Dersch, U.; Dolgolenko, A. G.; Dzyubenko, G. B.; Edelstein, R.; Emediato, L.; Endler, A. M. F.; Engelfried, J.; Eschrich, I.; Escobar, C. O.; Evdokimov, A. V.; Filimonov, I. S.; Garcia, F. G.; Gaspero, M.; Giller, I.; Golovtsov, V. L.; Gouffon, P.; Gulmez, E.; Kangling, H.; Iori, M.; Jun, S. Y.; Kaya, M.; Kilmer, J.; Kim, V. T.; Kochenda, L. M.; Konorov, I.; Kozhevnikov, A. P.; Krivshich, A. G.; Kruger, H.; Kubantsev, M. A.; Kubarovsky, V. P.; Kulyavtsev, A. I.; Kuropatkin, N. P.; Kurshetsov, V. F.; Kushnirenko, A.; Kwan, S.; Lach, J.; Lamberto, A.; Landsberg, L. G.; Larin, I.; Leikin, E. M.; Yunshan, L.; Luksys, M.; Lungov, T.; Maleev, V. P.; Mao, D.; Mao, C. S.; Mao, Z. L.; Mathew, P.; Mattson, M.; Matveev, V.; McCliment, E.; Moinester, M. A.; Molchanov, V. V.; Morelos, A.; Nelson, K. D.; Nemitkin, A. V.; Neoustroev, P. V.; Newsom, C.; Nilov, A. P.; Nurushev, S. B.; Ocherashvili, A.; Onel, Y.; Ozel, E.; Ozkorucuklu, S.; Penzo, A.; Petrenko, S. I.; Pogodin, P.; Povh, B.; Procario, M.; Prutskoi, V. A.; Ramberg, E.; Rappazzo, G. F.; Razmyslovich, B. V.; Rud, V. I.; Russ, J.; Schiavon, P.; Simon, J.; Sitnikov, A. I.; Skow, D.; Smith, V. J.; Srivastava, M.; Steiner, V.; Stepanov, V.; Stutte, L.; Svoiski, M.; Terentyev, N. K.; Thomas, G. P.; Uvarov, L. N.; Vasiliev, A. N.; Vavilov, D. V.; Verebryusov, V. S.; Victorov, V. A.; Vishnyakov, V. E.; Vorobyov, A. A.; Vorwalter, K.; You, J.; Zhao, W. H.; Zheng, S. C.; Zukanovich-Funchal, R.

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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: https://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.