The $(\pi^-,\gamma\gamma)$ program at TRIUMF
Nuclear Experiment
2011-07-19 v1
Abstract
We report the first observation of the doubly-radiative decay mode of pionic hydrogen (pi- p --> gamma gamma n) and and deuterium (pi- d --> gamma gamma X) using the RMC pair spectrometer at TRIUMF. The process is interesting in the context of the pi-Compton scattering and the chiPT predictions of the pion polarizability We present our preliminary values for the B.R.(pi- p --> gamma gamma n)=3.8x10^-5 and B.R.(pi- d --> gamma gamma X)=1.6x10^-5. Our pi- p data indicates the dominance of pi pi --> gamma gamma mechanism. The pi- d data shows no evidence for the d1* dibaryon.
Keywords
Cite
@article{arxiv.nucl-ex/0007011,
title = {The $(\pi^-,\gamma\gamma)$ program at TRIUMF},
author = {Piotr A. Zolnierczuk},
journal= {arXiv preprint arXiv:nucl-ex/0007011},
year = {2011}
}
Comments
Talk at MESON'2000 conference in Cracow, Poland (4 pages, 2 figures)