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hep-ph2004
A phenomenological determination of the pion-nucleon scattering lengths from pionic hydrogen
T. E. O. Ericson, B. Loiseau, S. Wycech
A model independent expression for the electromagnetic corrections to a phenomenological hadronic pion-nucleon scattering length, extracted from pionic hydrogen, is obtained. In a…
hep-ph2004
Antiproton-proton resonant like channels in J/Psi decays into photon, proton and antiproton
B. Loiseau, S. Wycech
The BES collaboration has recently observed a strong enhancement close to the proton-antiproton threshold in the J/Psi decays into photon, proton and antiproton. Such a structure c…
hep-ph2004
Amplitudes Fitted to Experimental Data and to Roy's Equations
Robert Kaminski, Leonard Lesniak, Benoit Loiseau
The scalar-isoscalar, scalar-isotensor and vector-isovector pi-pi amplitudes are fitted simultaneously to experimental data and to Roy's equations. The resulting amplitudes are com…