Phys. Rev. C
66,
034613
(2002)
[9 pages]
First measurement of π-e⃗π-eγ pion virtual compton scattering
A. Ocherashvili et al.
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A. Ocherashvili12,*, G. Alkhazov11, A. G. Atamantchouk11, M. Y. Balatz8,†, N. F. Bondar11, P. S. Cooper5, L. J. Dauwe17, G. V. Davidenko8, U. Dersch9,‡, A. G. Dolgolenko8, G. B. Dzyubenko8, R. Edelstein3, L. Emediato19, A. M. F. Endler4, J. Engelfried13,5, I. Eschrich9,§, C. O. Escobar19,**, A. V. Evdokimov8, I. S. Filimonov10,*, F. G. Garcia19,5, M. Gaspero18, I. Giller12, V. L. Golovtsov11, P. Gouffon19, E. Gülmez2, He Kangling7, M. Iori18, S. Y. Jun3, M. Kaya16, J. Kilmer5, V. T. Kim11, L. M. Kochenda11, I. Konorov9,††, A. P. Kozhevnikov6, A. G. Krivshich11, H. Krüger9,‡‡, M. A. Kubantsev8, V. P. Kubarovsky6, A. I. Kulyavtsev3,a, N. P. Kuropatkin11, V. F. Kurshetsov6, A. Kushnirenko3, S. Kwan5, J. Lach5, A. Lamberto20, L. G. Landsberg6, I. Larin8, E. M. Leikin10, Li Yunshan7, M. Luksys14, T. Lungov19,b, V. P. Maleev11, D. Mao3,a, Mao Chensheng7, Mao Zhenlin7, P. Mathew3,c, M. Mattson3, V. Matveev8, E. McCliment16, M. A. Moinester12, V. V. Molchanov6, A. Morelos13, K. D. Nelson16,d, A. V. Nemitkin10, P. V. Neoustroev11, C. Newsom16, A. P. Nilov8, S. B. Nurushev6, A. Ocherashvili12, Y. Onel16, E. Ozel16, S. Ozkorucuklu16, A. Penzo20, S. I. Petrenko6, P. Pogodin16, B. Pouh9, M. Procario3,e, V. A. Prutskoi8, E. Ramberg5, G. F. Rappazzo20, B. V. Razmyslovich11, V. I. Rud10, J. Russ3, P. Schiavon20, J. Simon9,f, A. I. Sitnikov8, D. Skow5, V. J. Smith15, M. Srivastava19, V. Steiner12, V. Stepanov11, L. Stutte5, M. Svoiski11, N. K. Terentyev11,3, G. P. Thomas1, L. N. Uvarov11, A. N. Vasiliev6, D. V. Vavilov6, V. S. Verebryusov8, V. A. Victorov6, V. E. Vishnyakov8, A. A. Vorobyov11, K. Vorwalter9,g, J. You3,5, Zhao Wenheng7, Zheng Shuchen7, and R. Zukanovich-Funchal19
1Ball State University, Muncie, Indiana 47306
2Bogazici University, Bebek, 80815 Istanbul, Turkey
3Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213
4Centro Brasiliero de Pesquisas Físicas, Rio de Janeiro, Brazil
5Fermilab, Batavia, Illinois 60510
6Institute for High Energy Physics, Protvino, Russia
7Institute of High Energy Physics, Beijing, People’s Republic of China
8Institute of Theoretical and Experimental Physics, Moscow, Russia
9Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany
10Moscow State University, Moscow, Russia
11Petersburg Nuclear Physics Institute, St. Petersburg, Russia
12Tel Aviv University, IL-69978 Ramat Aviv, Israel
13Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico
14Universidade Federal da Paraíba, Paraíba, Brazil
15University of Bristol, Bristol BS8 1TL, United Kingdom
16University of Iowa, Iowa City, Iowa 52242
17University of Michigan-Flint, Flint, Michigan 48502
18University of Rome “La Sapienza” and INFN, Rome, Italy
19University of São Paulo, São Paulo, Brazil
20University of Trieste and INFN, Trieste, Italy
Received 9 September 2001; revised 21 June 2002; published 26 September 2002
Pion virtual compton scattering (VCS) via the reaction π-e⃗π-eγ was observed in the Fermilab E781 SELEX experiment. SELEX used a 600GeV/c π- beam incident on target atomic electrons, detecting the incident π- and the final state π-, electron and γ. 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 π- VCS experimental cross section is σ=38.8±13 nb, in agreement with the theoretical expectation of σ=34.7 nb.
© 2002 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.66.034613
DOI:
10.1103/PhysRevC.66.034613
*Present address: Medson Ltd., Rehovot 76702, Israel. †Deceased. ‡Present address: Infineon Technologies AG, München, Germany. §Present address: Imperial College, London SW7 2BZ, U.K. **Present address: Instituto de Física da Universidade Estadual de Campinas, UNICAMP, SP, Brazil. ††Present address: Physik-Department, Technische Universität München, 85748 Garching, Germany. ‡‡Present address: The Boston Consulting Group, München, Germany. aPresent address: Fermilab, Batavia, IL. bPresent address: Instituto de Física Teórica da Universidade Estadual Paulista, São Paulo, Brazil. cPresent address: SPSS Inc., Chicago, IL. dPresent address: University of Alabama at Birmingham, Birmingham, AL 35294. ePresent address: DOE, Germantown, MD. fPresent address: Siemens Medizintechnik, Erlangen, Germany. gPresent address: Deutsche Bank AG, Eschborn, Germany.
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