Measurement of the pionium lifetime

Details Measurement of the pionium lifetime Measurement of the pionium lifetime

2008-09-29

arxiv.org/abs/0809.4963v3

Physics

High Energy Physics

High Energy Physics - Experiment

Parallel talk at ICHEP08, Philadelphia, USA, July 2008. 4 pages, LaTeX, 3 eps figures. v2: Term with pion mass squared was int

Scientific paper

We report the progress in the measurement of the pionium lifetime by the
DIRAC Collaboration at CERN (PS212). Based on data collected in 2001-2003 on Ni
targets we have achieved the precision of 11% in the measurement of the pionium
lifetime, which corresponds to the measurement of S-wave pion-pion scattering
lengths difference |a0-a2| with the accuracy of 6%.

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