A practical strategy is presented and succesfully implemented to determine form factors in the time-like but unphysical (below threshold) region usinh dispersion reletions, in a model independent way without any bias towards expected resonances, Space and time-like data have been employed along with a regularization scheme to unfold and solve the integral equations. Remarkably, resonance structures with peaks for the rho(770), rho'(1600) and a structure near the NNbar threshold are automatically generated. The phi peak is invisible thus refuting suggestions about any sizeable ssbar content in the nucleon.
Determination of nucleon and pion form factors via dispersion relations / Baldini, R; Dubnicka, S; Gauzzi, Paolo; Pacetti, S; Pasqualucci, E; Srivastava, Y.. - In: NUCLEAR PHYSICS. A. - ISSN 0375-9474. - 666:(2000), pp. 38C-43C. [10.1016/S0375-9474(00)00008-7]
Determination of nucleon and pion form factors via dispersion relations
GAUZZI, Paolo;
2000
Abstract
A practical strategy is presented and succesfully implemented to determine form factors in the time-like but unphysical (below threshold) region usinh dispersion reletions, in a model independent way without any bias towards expected resonances, Space and time-like data have been employed along with a regularization scheme to unfold and solve the integral equations. Remarkably, resonance structures with peaks for the rho(770), rho'(1600) and a structure near the NNbar threshold are automatically generated. The phi peak is invisible thus refuting suggestions about any sizeable ssbar content in the nucleon.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
