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Crossfeed studies

Crossfeed studies. Run the single D 0 sample with : Open cuts (plots sent yesterday) First production cuts Third production cuts Plots of crossfeed vs. p T pair (Kπ) Crossfeed defined as : # pairs (Kπ) / # ALL pairs Plots of mass width and mean vs. p T pair (Kπ). Open cuts.

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Crossfeed studies

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  1. Crossfeed studies • Run the single D0 sample with : • Open cuts (plots sent yesterday) • First production cuts • Third production cuts • Plots of crossfeed vs. pT pair (Kπ) • Crossfeed defined as : # pairs (Kπ) / # ALL pairs • Plots of mass width and mean vs. pT pair (Kπ)

  2. Open cuts

  3. First production

  4. Third production

  5. comments • The 3 samples show the same behaviors : • Crossfeed decreases with pT of pair • Plateau ~ 35% • Crossfeed is lower when taking only mass entries in [1.7;2.0], means more crossfeed have wrong mass value

  6. Inv mass • I looked at the invariant mass of true pair and crossfeed (wrong sign), in particular the mean and width since I saw yesterday a broader width when plotting the inv. Mass of crossfeed

  7. Open cuts • error bars are the fit parameters errors • The error bar for the last bin should be asymmetric in pT[2,20] • Plot on the bottom left is an example for a given pT bin of the fits

  8. First production

  9. Third production

  10. comments • For 3 samples : • Mean of fit : • Constant for true D0 pair • Slightly shifted for crossfeed and increases with pT of pair • Width of fit : • around  ~ 15 MeV for true D0 and slight increase with pT (expected) • Around twice the true D0 pair and large increase with pT • Inv mass histo : we see (left bottom plot) the effect of cuts in the # of entries : • The maximum of the inv. Mass distribution decreases from 1000 (open cuts) to 150 and 250 (first and third production)

  11. Pico cuts • Run the third production with the cuts used to make the pico files • Cuts are : • |D0|<1.85 • Probability>.1 • |dcaXYtoPV|<.1cm • |yD0|<.5 • |cosine(theta*)|<.6 • Silicon hits>2 • The cuts used in the plots here are only : • MuKpi (see last slides) • Pico cuts (see above) • For the invariant mass making, I don’t use other cuts

  12. crossfeed

  13. Inv. Mass vs pT D0

  14. comments • With the cuts used to make the pico files, the crossfeed is flattened • But error bars have increased because of the low statistic

  15. Open cuts • static const Double_t pTCut = 0.1; // transverse momentum cut • static const Double_t PCut = 0.1; // momentum cut • static const Double_t sumPCut = .5 ; // sum of momentum(kaon)+momentum(pion) • static const Double_t mKpiMin = 0.; // min mass of (Kpi) association • static const Double_t mKpiMax = 5; // max mass of (Kpi) association • static const Double_t DcaCut = 1; // single track DCA to PV • static const Int_t TpcCut = 10; // TPC hits fitted • static const Float_t TpcRatioCut = 0.51; // TPC hits fitted / TPC hits Poss • static const Double_t TrackLengthCut = 40; // min value for dEdxTrackLength • static const Int_t SiCut = 0; // (SVT+SSD) hits fitted • static const Int_t SvtCut = 3; // (SVT) hits fitted • static const Int_t SsdCut = 1; // (SSD) hits fitted • static const Float_t RadiusCutSvt1 = 9.0; • static const Float_t RadiusCutSvt2 = 13.0; • static const Float_t SigmaPionCut = 4.; // nsigma for pion • static const Float_t SigmaKaonCut = 4.; // nsigma for kaon • static const Float_t SigmaProtonCut = 4.; // nsigma for Proton • static const Double_t EtaCut = 2; // track pseudorapidity • static const Double_t zcut = 30; // zvertex cut • static const Double_t cosThetaCut = 1; • static const Double_t rapCandCut = 2.0; • static const Double_t slengthCut = 10; // max value of decaylength calculated by TCFIT • static const Double_t dslengthCut = 10; // max value of the error associated to the decaylength from TCFIT • static const Double_t ProbCut = 0.005; // min value of probability of FIT • static const Int_t writeHisto = 1; // flag to write histos

  16. First production : cuts • static const Double_t pTCut = 0.5; // transverse momentum cut • static const Double_t PCut = 0.5; // momentum cut • static const Double_t mKpiMin = 1.2; // min mass of (Kpi) association • static const Double_t mKpiMax = 2.2; // max mass of (Kpi) association • static const Double_t DcaCut = .1; // single track DCA to PV • static const Int_t TpcCut = 20; // TPC hits fitted • static const Double_t TrackLengthCut = 40; // min value for dEdxTrackLength • static const Int_t SiCut = 3; // (SVT+SSD) hits fitted • static const Int_t SvtCut = 3; // (SVT) hits fitted • static const Int_t SsdCut = 1; // (SSD) hits fitted • static const Float_t SigmaPionCut = 2.; // nsigma for pion • static const Float_t SigmaKaonCut = 2.; // nsigma for kaon • static const Float_t SigmaProtonCut = 2.; // nsigma for Proton • static const Double_t EtaCut = 1; // track pseudorapidity • static const Double_t zcut = 10; // zvertex cut • static const Double_t PrimZResCut = 0.020; // zvertex resolution cut • static const Double_t cosThetaCut = 0.6; • static const Double_t rapCandCut = 2.0; • static const Double_t slengthCut = 10; // max value of decaylength calculated by TCFIT • static const Double_t dslengthCut = 10; // max value of the error associated to the decaylength from TCFIT • static const Double_t ProbCut = 0.005; // min value of probability of FIT • static const Int_t writeHisto = 1; // flag to write histos

  17. Third production : cuts • static const Double_t pTCut = 0.5; // transverse momentum cut (not used) • static const Double_t PCut = 2.0; // momentum cut (not used) • static const Double_t sumPCut = 1.5 ; // sum of momentum(kaon)+momentum(pion) • static const Double_t mKpiMin = 1.2; // min mass of (Kpi) association • static const Double_t mKpiMax = 2.2; // max mass of (Kpi) association • static const Double_t DcaCut = 0.2; // single track DCA to PV • static const Int_t TpcCut = 25; // TPC hits fitted • static const Float_t TpcRatioCut = 0.51; // TPC hits fitted / TPC hits Poss • static const Double_t TrackLengthCut = 40; // min value for dEdxTrackLength • static const Int_t SiCut = 2; // (SVT+SSD) hits fitted • static const Int_t SvtCut = 3; // (SVT) hits fitted • static const Int_t SsdCut = 1; // (SSD) hits fitted • static const Float_t RadiusCutSvt1 = 9.0; • static const Float_t RadiusCutSvt2 = 13.0; • static const Float_t SigmaPionCut = 2.5; // nsigma for pion • static const Float_t SigmaKaonCut = 2.5; // nsigma for kaon • static const Float_t SigmaProtonCut = 3.; // nsigma for Proton • static const Double_t EtaCut = 1.2; // track pseudorapidity • static const Double_t zcut = 10; // zvertex cut • static const Double_t PrimZResCut = 0.020; // zvertex resolution cut • static const Double_t cosThetaCut = 0.8; • static const Double_t rapCandCut = 1.0; • static const Double_t slengthCut =.2; // max value of decaylength calculated by TCFIT • static const Double_t dslengthCut =.1; // max value of the error associated to the decaylength from TCFIT • static const Double_t ProbCut =.05; // min value of probability of FIT • static const Int_t writeHisto = 1; // flag to write histos

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