Implications
How would an interfering amplitude affect form factor measurements?
-in process of evaluating this but fit quality improves dramatically
-might effect the overall scale of the form factors derived from the branching fraction Kpmn/K2p
What could be the strength of an s-wave amplitude according to theory?
-a small NR-K* interference (~10%) has been predicted by B. Bajc, S. Fajfer, R.J. Oakes, T.N. Pham (1997) hep-ph/9710422
Amundson and Rosner, Phys. Rev. D47, (1993) 1951
Will there be similar effects in other charm semileptonic or beauty semileptonic channels?
The new amplitude is small: About 7% of the BW peak amplitude in the H0 piece.
Our data is consistent with an interference of the (approximate ) form: