In order to validate the new AODs(138 and 142) concerning the Lc-->pKpi analysis, some tests were performed, comparing the distribution of the invariant mass of 3 prongs candidates.

PID cuts

No extra PID cuts were applied during analysis level (in comparison with the production cuts).

Topological cuts

Since AOD138 and AOD142 have looser cuts, same topological cuts as AOD115 were applied during analysis level. The cuts are described below:

  Float_t cutsArrayLctopKpi[13]={0.13,0.9,1.,0.,0.,0.01,0.04,0.006,1.,0.5,0.,0.05,0.4};
  //  inv. mass [GeV]
  // pTK [GeV/c]
  // pTPi [GeV/c]
  // d0K [cm]   lower limit!
  // d0Pi [cm]  lower limit!
  // dist12 (cm)
  // sigmavert (cm)
  // dist prim-sec (cm)
  // pM=Max{pT1,pT2,pT3} (GeV/c)
  // cosThetaPoint
  // Sum d0^2 (cm^2)
  // dca cut (cm)
  // pTProton [GeV/c]

Results

1 - Run 170387

Figure 1.1 - Invariant Mass 3 prongs (pKpi) -- Normalized by the number of events analysed

Figure 1.2 - Invariant Mass 3 prongs (pKpi) -- Normalized by 2.15 - 2.4 GeV/c² region

2 Run 168069

Figure 2.1 - Invariant Mass 3 prongs (pKpi) -- Normalized by the number of events analysed

Figure 2.2 - Invariant Mass 3 prongs (pKpi) -- Normalized by 2.15 - 2.4 GeV/c² region

3 Run 170593

Figure 3.1 - Invariant Mass 3 prongs (pKpi) -- Normalized by the number of events analysed

Figure 3.2 - Invariant Mass 3 prongs (pKpi) -- Normalized by 2.15 - 2.4 GeV/c² region

Conclusions/Discussions

The results shown in the figures 1.1,1.2,2.1,2.2,3.1 and 3.2 indicate that all the reconstructions(AOD115, AOD138 and AOD142) are consistent with each other. The Normalization by the entries in the 2.15--2.4 GeV/c² region (figures 1.2, 2.2 and 3.2) shows that the shape is the same, no matter which production one uses. Normalizing by the number of events, one can see that the shape persists compatible with each other. The difference in amplitude seen for AOD115 is due to the absence of any PID cut in the AOD production, whereas a loose PID cut was introduced for AOD138 and AOD142.