Abstrakt
We search for the tree-diagram dominated process B+ -> pn over bar pi 0, using a data sample of 772 x 106BB over bar pairs collected at the 3d(2);(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. This is the first search with the Belle detector for a decay mode including an antineutron.
No significant signal is observed and a 90% credible upper limit on the branching fraction is set at 6.3 x 10-6.