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BRTW Fit on D0+D0bar Inv. Mass Plots from 1 st Production & Effective Signal Calculation

BRTW Fit on D0+D0bar Inv. Mass Plots from 1 st Production & Effective Signal Calculation. 1 st December 2010. MassD0 = 1.8648, sigma = 20MeV and Reject point at 3 sigma. S/N ~ 13.78 (raw yield, from Yuri’s calculation) Significance ( s/√(s+b )) ~ 1.7375.

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BRTW Fit on D0+D0bar Inv. Mass Plots from 1 st Production & Effective Signal Calculation

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  1. BRTW Fit on D0+D0bar Inv. Mass Plots from 1st Production&Effective Signal Calculation 1st December 2010

  2. MassD0 = 1.8648, sigma = 20MeV and Reject point at 3 sigma S/N ~ 13.78 (raw yield, from Yuri’s calculation) Significance (s/√(s+b)) ~ 1.7375

  3. With MassD0 = 1.8648, sigma = 20MeV and Reject point at 4 sigma S/N ~ 10.759 (raw yield, from Yuri’s calculation) Significance (s/√(s+b)) ~ 2.2304

  4. With MassD0 = 1.8648, sigma = 20MeV and Reject point at 5 sigma S/N ~ 10.7586 (raw yield, from Yuri’s calculation) Significance (s/√(s+b)) ~ 3.4732

  5. With MassD0 = 1.8648, sigma = 20MeV and Reject point at 5 sigma but with increased fit range (1.7,2.1) S/N ~ 10.4449 (raw yield, from Yuri’s calculation) Significance (s/√(s+b)) ~ 1.3991

  6. With MassD0 = 1.8648, sigma = 15.5MeV and Reject point at 5 sigma S/N ~ 8.8076 (raw yield, from Yuri’s calculation) Significance (s/√(s+b)) ~ 1.3159

  7. Sigma of the pure D0 sample (power law pT distribution) Pure D0 hijing sample gives a sigma of 15.5MeV

  8. Summary • The reject point used in BRTW macro was varied to see the effect • When the reject point is increased to 4 or 5 sigma we get a better chi^2/ndf • Also looked at the sigma of D0 signal from Simulation and it is about 15.5MeV • A better fit is obtained by increasing the sigma from the default value 10MeV used in the fit macro to 20MeV • Attempted to calculate the effective signal S/√(S+B) by counting the number of entries under the signal and background curves. • Best value of Effective Signal got is 3.47 corresponding to a raw yield of 10.7586 • Need to look at the sigma of D0bar and D0+D0bar from simulation. • Need to check if the calculation of effective signal is right.

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