The $(π^-,γγ)$ program at TRIUMF

Details The $(π^-,γγ)$ program at TRIUMF The $(π^-,γγ)$ program at TRIUMF

2000-07-11

arxiv.org/abs/nucl-ex/0007011v1

Acta Phys.Polon.B31:2349-2352,2000

Physics

Nuclear Physics

Nuclear Experiment

Talk at MESON'2000 conference in Cracow, Poland (4 pages, 2 figures)

Scientific paper

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.

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