D0 Cut Variables Resolution in micro-Vertex code(MuKpi.C)

How?

Ø The Good daughter tracks are found from the matchedpair info in .minimc.root file.

Ø The same daughter tracks are found and D0 is reconstructed in MuKpi.C

Ø Do the same in .geant.root file

Ø Plot the difference.

1. Mass Resolution

Reco

Gauss Fit

Reco

Geant

Since the D0 mass is a single value in geant the Reco distribution is the resolution. After doing a gauss fit to the peak the resolution is ~0.8% (as expected)

1. Decay Length distribution

Reco

Geant

2. Distribution of Eta of D0

3. Pz Distribution of D0

4. Phi Distribution

5. pT Distribution of D0

6. Resolution of pT

mean(pT_RECO - pT_GEANT)

A slope of 3MeV is expected due to the decreasing D0 mass with pT increase. Here the slope is 2.17+-0.1MeV, which is in agreement with the above.

σ_{(pTRECO - pTGEANT/pTGEANT)}

For Sigma single Track resolution is not expected.

Decay Length Resolution pure D0 Sample:

mean(dL_RECO - dL_GEANT)

σ_{(dLRECO - dLGEANT/dLGEANT)}