Scalar Form Factors in SU(3) Chiral Perturbation Theory

The scalar form factors for the pions and kaons are calculated in SU(3) Chiral Perturbation Theory at order p⁶, in the isospin limit m_u = m_d = hat m. We find in general sizable corrections of Script O(p⁶). We use our results to obtain information on the 1/N_c suppressed low energy constants L₄^r and L₆^r as well as on two Script O(p⁶) low energy constants. We present some numerical results for masses and decay constants as well. We derive a relation for the scalar form factors analogous to Sirlin's relation for vector form factors.