Measurement of pionium lifetime with the Dirac spectrometer
IGFAE, Universidade de Santiago de Compostela, 15706, Santiago de Compostela, Spain
* e-mail: email@example.com
Accepted: 15 November 2006
Published online: 5 March 2007
Pionium ( π + π - bound state) lifetime is measured with improved precision with respect to earlier work, and the ππ s-wave scattering length difference between I = 0 and I = 2 amplitudes | a 0 - a 2| is determined to 5% precision.
PACS: 13.75.Lb Meson-meson interactions – / 12.39.Fe Chiral Lagrangians –
© Società Italiana di Fisica and Springer-Verlag, 2007