1. 3/29/111 Cuts breakdown : outline Use file with open cuts and apply cut values from the third production. Done for : –All pairs –True D 0 pairs –Crossfeed pairs Cuts are applied in the same order than those executed in MuKpi.

2. 3/29/112 List of cuts 1. TString vertexcut = " abs(Vz)<10 "; 2. TString tpccutF = " && (TpcKaonF>25) && (TpcPionF>25)"; 3. TString tpccut = " && (TpcKaonF/TpcKaonP)>.51 && (TpcPionF/TpcPionP)>.51"; 4. TString etacut = " && abs(etaPion)<1.2 && (etaKaon)<1.2"; 5. TString sicut = " && (SsdPion+SvtPion)>1 && (SsdKaon+SvtKaon)>1" ; 6. TString boolT = " && boolPion==1 && boolKaon==1"; 7. TString nsigmacut = " && TMath::Abs(ndEdxPion)<2.5 && TMath::Abs(ndEdxKaon)<2.5"; 8. TString dcacut = " && abs(dcaXYPion)<.2 && abs(dcaXYKaon)<.2"; 9. TString pcut = " && (PPion+PKaon)>1.5"; 10. TString cosinecut = " && abs(thetaGJ)<.8"; 11. TString yD0 = " && abs(RapD0)<1"; 12. TString slengthD0 = " && abs(slength)<.2"; 13. TString dslengthD0 = " && dslength<.1"; 14. TString probD0 = " && probability>=.05"; This cut translates than the logic for the radius of first hit

3. 3/29/113 All pairs

4. 3/29/114 All pairs probability dslength rapidity slengthCosine(theta*) Aftert Sum momentum After single Dca after vertex cut After tpcF After ratio After track eta After silicon cut After logic cut After ndEdx

5. 3/29/115 comments Cut 2 (tpc hits fitted) removed a lot but we see that the next cut (ratio fitted/poss) does not remove a lot, so it’s OK because we have to apply the cut ratio fitted/poss The major part of entries removal is done by : –Silicon hits –Logic of first hit radius –nsigma of dEdx The other cuts are negligible, except maybe the probability cut.

6. 3/29/116 Listing of # of entries h0 --> # : 20863 h1 --> # : 20019 h2 --> # : 16768 h3 --> # : 16768 h4 --> # : 16768 h5 --> # : 12837 h6 --> # : 9111 h7 --> # : 5538 h8 --> # : 5536 h9 --> # : 5536 h10 --> # : 4927 h11 --> # : 4927 h12 --> # : 4927 h13 --> # : 4927 h14 --> # : 3941 After probability cut After zvertex cut

7. 3/29/117 D 0 pairs The cut of the sign is applied here

8. 3/29/118 Crossfeed pairs The cut of the sign is applied here ndEdx cut removes a lot of crossfeed pirs

9. 3/29/119 Listing for true D 0 (left) and crossfeed pairs(right) h0 --> # : 20863 h1 --> # : 10041 h2 --> # : 8411 h3 --> # : 8411 h4 --> # : 8411 h5 --> # : 6440 h6 --> # : 4572 h7 --> # : 3531 h8 --> # : 3529 h9 --> # : 3529 h10 --> # : 2981 h11 --> # : 2981 h12 --> # : 2981 h13 --> # : 2981 h14 --> # : 2378 h0 --> # : 20863 h1 --> # : 9967 h2 --> # : 8351 h3 --> # : 8351 h4 --> # : 8351 h5 --> # : 6397 h6 --> # : 4539 h7 --> # : 2007 h8 --> # : 2007 h9 --> # : 2007 h10 --> # : 1946 h11 --> # : 1946 h12 --> # : 1946 h13 --> # : 1946 h14 --> # : 1563