PT Journal AU Ruiz-Femenia, P Zahiri-Abyaneh, M TI On the minimality of the order p(6) chiral Lagrangian SO Physics Letters B JI Phys. Lett. B PY 2015 BP 256 EP 261 VL 751 DI 10.1016/j.physletb.2015.10.042 LA English AB A method to find relations between the operators in the mesonic Lagrangian of Chiral Perturbation Theory at order p(6) is presented. The procedure can be used to establish if the basis of operators in the Lagrangian is minimal. As an example, we apply the method to the two-flavor case in the absence of scalar and pseudo-scalar sources (s = p = 0), and conclude that the minimal Lagrangian contains 27 independent operators. ER