Artigo
First measurement of π-e→π-eγ pion virtual compton scattering
Fecha
2002-09-01Registro en:
Physical Review C - Nuclear Physics, v. 66, n. 3, p. 346131-346139, 2002.
0556-2813
10.1103/PhysRevC.66.034613
2-s2.0-4243272222
2-s2.0-4243272222.pdf
Autor
Ball State University
Bogazici University
Carnegie-Mellon University
Centro Brasiliero de Pesquisas Físicas
Fermilab
Institute for High Energy Physics
Institute of High Energy Physics
Institute of Theoretical and Experimental Physics
Max-Planck-Institut für Kernphysik
Moscow State University
Petersburg Nuclear Physics Institute
Tel Aviv University
Universidad Autónoma de San Luis Potosí
Universidade Federal da Paraíba (UFPB)
University of Bristol
University of Iowa
University of Michigan
INFN
Universidade de São Paulo (USP)
Medson Ltd.
Infineon Technologies AG
Imperial College
Universidade Estadual de Campinas (UNICAMP)
Technische Universität München
The Boston Consulting Group
Universidade Estadual Paulista (Unesp)
SPSS Inc.
University of Alabama at Birmingham
DOE
Siemens Medizintechnik
Deutsche Bank AG
Resumen
Pion virtual compton scattering (VCS) via the reaction π-e→π-eγ was observed in the Fermilab E781 SELEX experiment. SELEX used a 600 GeV/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.