Fitting technique
- Binned likelihood fit to the time histogram in signal region w/ background contributions
- Fit the f(t) corrected exponential for KK events ? the lifetime histogram of sidebands
- The signal region background is an average of the two non-charm side-bands
- Mass fit used to partition Region B2 events as non-charm side-band versus K? reflection
- Reflection mass shape taken direct from MC
- Subtract out the expected histogram for K? reflection events
- The level set by the mass fit
- Reflection time evolution from ? (K?) by simultaneous fit of K? time spectrum
- Subtract K? reflection ?Region B2 non-charm background time evolution.
- Fit parameters are YCP, ? K? , BK? in K? time hist , BKK in KK hist