Coherent pi^+pi^-pi^- production in the interactions of a beam of 600 GeV pi^- mesons with C, Cu and Pb nuclei has been studied with the SELEX facility (Experiment E781 at Fermilab). The a2(1320) meson signal has been detected in the Coulomb (low q^2) region. The Primakoff formalism used to extract radiative decay width of this meson yields Gamma=284+/-25+/-25 keV, which is the most precise measurement to date.
@article{arxiv.hep-ex/0109016,
title = {Radiative decay width of the a2(1320)^- meson},
author = {The SELEX collaboration and V. V. Molchanov},
journal= {arXiv preprint arXiv:hep-ex/0109016},
year = {2008}
}
Comments
16 pages, 5 figures, LaTeX, elsart, added reference and minor corrections, submitted to Phys.Lett.B