出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We investigate the vector and scalar Kp form factors at low energies by the method of unitarity bounds which makes use of perturbative QCD for a suitable correlator and information on the phase and modulus along the elastic region of the unitarity cut. Using the values of the form factors at t =0 we obtain stringent constraints on the slope and curvature for the two form factors. The use of the value of the scalar form factor at the Callan-Treiman point (M2K −M2p) improves the constraints significantly.
