Observation of interference in D+ semileptonic decay into Kpmn
I intended to measure several semileptonic form factors as a thesis
- D+?K*0mn was intended as training exercise for the more controversial Ds+ ?fmn
We could not get good confidence level fits on K*0mn, even after exhaustive checks of MC and possible backgrounds
- Known backgrounds were small and benign (in form factor variables)
- The Monte Carlo simulated both resolution and acceptance well.
We then made a crucial observation that led to an explicit interference model
- The model is described by only a single amplitude and phase
- The model explained the discrepancies between the data and the fit.
- And suggested numerous new places to search for interference