Measurement of the branching fraction and the CP-violating asymmetry for the decay B{sup 0}{yields}K{sub S}{sup 0}{pi}{sup 0}

We measure the branching fraction and the CP-violating asymmetry of B{sup 0}{yields}K{sub S}{sup 0}{pi}{sup 0} decays with 227 million {upsilon}(4S){yields}BB events collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at SLAC. We obtain a branching fraction B(B{sup 0}{yields}K{sup 0}{pi}{sup 0})=(11.4{+-}0.9{+-}0.6)x10{sup -6} and CP-violating asymmetry parameters C{sub K{sub S}{sup 0}}{pi}{sup 0}=0.06{+-}0.18{+-}0.03 and S{sub K{sup 0}}{pi}{sup 0}=0.35{sub -0.33}{sup +0.30}{+-}0.04, where the first error is statistical and the second systematic.