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### Analysis of CCbar Events from METU Data: Vertex Selection Criteria and Event Classification ###

This document discusses the analysis of CCbar events using data from METU, focusing on vertex selection criteria and event classification. It outlines the conditions under which vertices with TT-matched tracks, isolated muons, and segmented daughter tracks are reconstructed. The analysis is based on a sample of events, evaluating charm fractions, efficiencies, and kinematic distributions. The study highlights the efficiency of kinks and tridents observed in CC and NC interactions, contributing valuable insights into particle behavior in high-energy collisions. ###

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### Analysis of CCbar Events from METU Data: Vertex Selection Criteria and Event Classification ###

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  1. CCbar analysis M. Guler, METU, Ankara

  2. 0mu/1mu selection • I: • If (a vertex with one TT-matched track & Parent track (at least 0ne-segment) & at least two-segment daughter having TT-hits is reconstructed) • II: • If (a vertex with one-TT matched track & at least 3-segment Isolated Muon (or good hadron in 0mu) is reconstructed) • III: • If(a vertex wih at least one-TT track && a second vertex with tracks • having TT-hits ) • IV: • If(a muon track (or good hadron in 0mu) is recontructed && at least 3 –segment track stop in the same plate. )

  3. Data sample Data sample: Map-03-04-15 (157846 events) Netscan Nucleus: Ver-03-09-02 Selection: SatoMurat-ver03&& golden-04-02-02.awk NuMu-CC events= 95450(93890) -Selected= 2816 -2059 charm -5 double charm 0mu events= 26568+1502 selected=827 -347 charm - 3 double charm

  4. 76925575 E=41.4GeV TT #2, Pd>1.82 GeV/c @ 90 C.L. TT #3, Pd1>3.81 GeV/c @ 90 C.L. TT #1, Pd2>4.11 GeV/c @ 90 C.L. TT #6 pl26

  5. 76925575 1ry@pl26 Ns=2, Nh=0 V2 @pl 26 Dq =104.2 mrad fl= 223.9mm Min_mass >0.68 GeV @ 90 CL. kink @pl 26 fl= 163.0 mm Dq =179.0 mrad PT= 0.719-0.258 GeV/c(MCS) PT>0.323 GeV/c @ 90 C.L. co-planality Q= 14.9+-2.0 mrad +0.786

  6. 81332312 E=29.9GeV TT #5, Pd1> 1.39 GeV/C @ 90CL. TT #8, Pd2>4.66 GeV/C @ 90 CL. Pd3>3.33 GeV/c @ 90 CL. TT #3 Pd4>2.72 GeV/c @ 90 CL. TT #6 PP>0.66 GeV/C @ 90 CL. pl23 pl22

  7. 81332312 Q= 24.2+-5.3 mrad 1ry@pl23 Ns=1, Nh=3 V2(1) @pl 23 Dq =96.3 mrad fl= 62.8mm Min_mass >0.76 GeV @ 90 CL. V2(2) @pl 22 fl= 976.6mm Dq =203.4 mrad Min_mass >1.33 GeV @ 90 CL. Q= 36.1+-0.3 mrad

  8. 56452542 rejected E=21.6 GeV 1ry@pl9 Ns=2, Nh=0 kink @pl 9 Dq =182.9 mrad fl= 50.9mm trident @pl 8 fl= 398.0 mm TT #2 TT #1 TT #3 TT #4, P = ? Pl 9 Pl 8

  9. 77393952

  10. 78220511 E=9.9 GeV P=-12.2GeV/c Evis=22.2GeV/c 1ry@pl28 Ns>10, Nh>10 Kink @pl 26 Dq =79.4 mrad fl= 1367.5mm PT= 0.079 -0.01 GeV/c (MCS) PT>0.047 GeV/c @ 90 CL. trident @pl 25 fl= 2556.5 mm +0.02 Pl28 Pl 26 pl 25

  11. 79044944 E=36.9 GeV P=-16.9 GeV/c Evis= 53.8 GeV Pd1>4.70 GeV/c @ 90 CL.(TT #2) Pd2>0.67 GeV/c @ 90 CL. Pd2>1.92 GeV/c @90 CL.(TT #5) Pd3>2.32 GeV/c @90 CL.(TT #7) Pl31 pl30

  12. 79044944 co-planality 1ry@pl31 Ns=4, Nh=0 V2 @pl 31 Q op= 340.2 mrad fl= 58.2mm Min_mass> 0.79 GeV/c @90 CL. (using MCS momentums) V4 @pl 30 fl= 761mm Q= 14.3+-2.0 mrad D0 d1 d2

  13. 77891071 E=35.4 GeV P=-13.5 GeV/c Evis=48.9 GeV P>2.04 GeV @90 CL P>0.31 GeV @90 CL P>1.92 GeV @90 CL Pl 7 Pl 6 pl 4

  14. 77891071 co-planality 1ry@pl7 Ns=6, Nh=1 V2 @pl 6 fl= 257.0mm Mmin> 0.58 GeV @90 CL kink @pl 4 fl= 2271.6 mm Dq = 67.4mrad PT> 0.14 GeV @ 90 CL Q= 17.2+-2.0 mrad D0 d1 d2

  15. 77691080 E=17.5 GeV P=-22.9 GeV/c Evis=40.4 GeV Pd> 0.39 GeV/c @90 CL. Pd1>2.08 GeV/c @90 CL. TT #4 Pd2> 1.09 GeV/c @90 CL. P33 Pl31 pl29

  16. 77691080 co-planality 1ry@pl33 Ns=2, Nh=4 kink @pl 231 Dq =302.0 mrad fl= 1445.5mm Pt= 0.2 -0.04 GeV/c (MCS) Pt> 0.12 GeV/c @ 90 CL. V2@pl 29 Q op= 298.0 mrad fl= 3012.6 mm Min_mass>0.77 GeV @ 90 CL. Q= 52.4+-2.0 mrad D0 d1 +0.07 d2

  17. 51872165 E=75.4GeV P=-106.7 GeV/c Evis=182.3 GeV 1ry@pl22 Ns=2, Nh=0 Trident @pl 20 fl= 1105.4 mm Min_mass>0.57 GeV @ 90 CL. V6?@pl 20 fl= 1211.2 mm Min_mass>1.8 GeV @ 90 CL. Pt1>3.81 GeV/c Pt2>1.29 GeV/c Pt3>2.58 GeV/c V5 ?? Pd1> 2.38 GeV/c Pd2>0.92 GeV/c Pd3> 1.03 GeV/c P22 Pl20 Pd4>1.31 GeV/c

  18. MC simulation Herwig(G.D.L)--->Eficass ---->Chant ~30 K CC && ~53 K NC ccbar events CC NC

  19. ccbar MC CC NC 1521 mm 2395 mm

  20. Charm fractions NC CC

  21. Hadronization NC D0 D0 D+ D- Ds+ D s- l c+ lc - 18.9 26.9 13.6 15.7 1.3 6.6 16.1 1.0 (%) CC D0 D0 D+ D- Ds+ D s- l c+ lc - 24.9 28.7 18.5 15.9 2.8 4.9 4.1 0.2 (%)

  22. Efficiency estimation NCDIS CCBAR MC events All events : 53034 In Emulsion : 28792 (54.3%) Prdc>0 : 13534 (47.0%) Right stack : 12589 (93.0%) SB found in CS: 10066 (79.9%) Located as 0mu: 4862 (48.3%) Selected : 1716 (35.3%) <enet>= 35.3±0.7% <eloc>= 16.9±0.2% CCDIS CCBAR MC events All events : 29939 In Emulsion : 16264 (54.3%) Prdc>0 : 7954 (48.9%) Right stack : 7500 (94.3%) Muon found : 6320 (85.1%) Located as CC : 4661 (73.8%) Selected : 1055 (22.6%) <enet>= 22.6±0.6 % <eloc>= 28.7±0.4%

  23. Selection efficiencies

  24. Kink PT

  25. Location efficiencies

  26. Background in CC ccbar Primary vertex secondary vertex event yield nmN -- m c S X S  - 1 prong 0.140.002 nmN -- m chXh white kink 0.550.010 nmN -- m chXh white trident 0.060.002 nmN -- m chXh white C5 0.0230.005 nmN -- m ch0Xh0 white V2 0.010.01 nmN -- m ch0 Xh0 whiteV4 0.0060.006 Overall 0.79 0.10

  27. Background in NC ccbar Primary vertex secondary vertex event yield nmN -- m c S X S  - 1 prong 0.0250.006 nmN -- m chXh white kink 0.080.02 nmN -- m chXh white trident 0.0120.003 nmN -- m chXh white C5 0.0030.002 nmN -- m ch0Xh0 white V2 0.0030.002 nmN -- m ch0 Xh0 whiteV4 0.00120.0007 Overall 0.12 0.02

  28. Production rate 3 candidate events in NC are signal and background is 0.12±0.02 eloc(ccbar)/e loc(NC) =0.77+-0.01 s(cc)/s(NC)=(3.5±2.1±0.6)x10-4

  29. Production rate 5 candidate events in NC are signal and background is 0.79±0.10 eloc(ccbar)/e loc(NC) =0.51+-0.01 s(cc)/s(CC)=(3.9±1.9(stat)±0.6(syst.))x10-4 2 events survive PT>0.25 GeV/c assume bg ~0.2 eloc(ccbar)/e loc(NC) =0.51+-0.01 s(cc)/s(CC)=(1.7±1.3(stat)±0.3(syst.))x10-4

  30. Status • Draft2 is ready • Waiting the comments (some already received)

  31. Hadronization D0 (%) D+ (%) Ds(%) lc (%) D023.5+-0.3 14.9+-0.2 2.1+-0.1 16.6+-0.3 D-12.4+-0.2 7.9+-0.2 1.0+-0.1 8.9+-0.2 Ds5.5+-0.2 3.2+-0.1 0.4+-0.1 3.5+-0.1 neutral + neutral= 23.5+-0.3 % neutral + charged= 51.5+-0.3 % charged+ charged= 25.0+-0.3 %

  32. Hadronization V2 V4 V6 C1 C3 C5 V2 14.6+-0.2 7.2+-0.2 0.1+-0.1 18.6+-0.3 18.9+-0.2 1.1+-0.1 V4 - 0.8+-0.1 0.0+-0.1 4.2+-0.1 4.6+-0.1 0.3+-0.1 V6 - - 0.0+-0.1 0.1+0.1 0.0+-0.1 0.0+-0.1 C1 - - - 5.1+-0.2 10.8+-0.2 0.3+-0.1 C3 - - - - 5.7+-0.2 0.8+0.1 C5 - - - - - 0.0+-0.1

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