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Dragan Mani ć Belgrade SHINE gr o u p

Dragan Mani ć Belgrade SHINE gr o u p. K s 0 analysis in SHOE framework. Wroclaw analysis/calibration/software workshop March the 8 th , 2012. Data Set. pC 31GeV collisions runs: 09J Production

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Dragan Mani ć Belgrade SHINE gr o u p

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  1. Dragan Manić Belgrade SHINE group Ks0 analysis in SHOE framework Wroclaw analysis/calibration/software workshop March the 8th, 2012

  2. Data Set pC 31GeV collisions runs: 09J Production 8599 8600 8601 8602 8607 8608 8609 8610 8611 8612 8613 8614 8615 8616 8617 8650 8652 8653 8654 8659 8660 8661 8662 8663 8664 8665 8667 8668 8669 8670 8671 8672 8673 8674 8675 8676 8677 8678 8679 8711 8712 8713 8714 8715 8724 8725 8726 8727 8728 8729 8730 8731 8732 8733 8734 8735 8736 8737 8738 8739 8740 8741 8742 8743 8744 8745 8746 8747 8748 8749 8750 8751 8752 8753 8754 8755 8756 8757 8758 8760 8761 8762 8763 8764 8765 8766 8767 8768 Total number of events: 4240322

  3. Description of the cuts • Event cuts • Cut 0: T2 trigger cut • Cut 1: BPD Cut • Cut 2: Main Vertex present • Cut 3: Fitted vertex present • Cut 4: Fitted vertex position correspond to target position; z=(-585, -575)cm • Vertex cuts • Cut 0: Vertex type: VZeroFF • Cut 1: Two daughter particles • Cut 2: Different charge for daughter particles • Cut 3: Distance between two daughter tracks at target z-plane more then 1.5 cm • Cut 4: Z distance between primary and secondary vertices is between 6 and 270 cm • Cut 5: V0 track based on secondary vertex to primary vertex distance is less then 0.6 cm • Cut 6: dE/dx cut • Cut 7: Set mass window between 0.4 and 0.6GeV

  4. Description of the cuts Number of events after cuts Number of vertices after cuts Total number of vertices after event cuts: 11032161 ----Vertex Cuts: --- Vertex Cut 0: 5832600 (52.87%) Vertex Cut 1: 0 (0.00%) Vertex Cut 2: 1720706 (15.60%) Vertex Cut 3: 2230769 (20.22%) Vertex Cut 4: 542494 (4.92%) Vertex Cut 5: 594775 (5.39%) Vertex Cut 6: 68202 (0.62%) Vertex Cut 7: 18116 (0.16%) Number of Vertices left: 24499 (0.22%) Total number of events: 4240322 ----Event Cuts: --- Event Cut 0: 746816 (17.61%) Event Cut 1: 1284357 (30.29%) Event Cut 2: 57432 (1.35%) Event Cut 3: 788584 (18.60%) Event Cut 4: 217739 (5.13%) Number of Events left: 1145394 (27.01%)

  5. Distance between tracks How it was. How it is now.. Distance cut at 1.5 cm

  6. Energy loss histograms Before cut: dE/dx histogram for positive particles dE/dx histogram for negative particles

  7. Energy loss histograms After cut: dE/dx histogram for positive particles dE/dx histogram for negative particles

  8. Fitting and quality of the analysis Signal: Background: Signal+ Background Global fit: Signal significance: This estimation is based on data within ±2s from the signal pick (green vertical lines on the histograms).

  9. Comparison of the analyses Number of events: 935,030 Zagreb ROOT61 Sig significance = 33.5 Wroclaw SHOE Sig significance= 34.4

  10. Ks0 mass distribution Number of events: 4,240,322 S = 8490 B = 5105 SigSignf = 72.9

  11. Thank You

  12. Latest version of SHINE - v0r2p2 Number of events: 500,000 Cut 3: Distance between two daughter tracks at secondary vertex z-plane lessthen 1 cm

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