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Status of Scan-forth for hadronic interaction background study

Status of Scan-forth for hadronic interaction background study. Tomoko Ariga for Swiss group. Motivation. Hadron re-interactions : important source of background for tau hadronic decay channel Large Monte Carlo uncertainties in estimation of this background To do

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Status of Scan-forth for hadronic interaction background study

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  1. Status of Scan-forth for hadronic interaction background study Tomoko Ariga for Swiss group

  2. Motivation Hadron re-interactions : important source of background for tau hadronic decay channel Large Monte Carlo uncertainties in estimation of this background To do analyze data to measure the number of decay-like interactions

  3. What is scan-forth ? Scan-back Plate 57 Scan-forth Plate 57

  4. Status Located in brick in Bern : 73 events Scan-forth done : 68 events 229 tracks from primary vertex (rejecting mu, track slope>0.4, e-pair, black track) 116 tracks are target of Scan-forth 23 stopping point (analysis of kink<0.03 not yet) 14 point checked -> 2ry vertex found for 5 stopping points

  5. Followed track length (plates) Total 3.3m

  6. VolumeScan for stopping point 0.6rad (our acceptance) 4mm VolumeScan for 1ry vtx 8mm x 8mm x 9 plates Up 4, Down 5

  7. 2ry vertex list • Brick 1ry 2ry tracks from 2ry vertex • p13 p19 2 thin tracks + 3 e-pairs (+ 1 gray track (slope>1)) • 71713p16p43 1 thin track + 1 backward gray track • 98326 p35 p54 1 thin track • 30945 p17 p42 1 black track • 82367 p04 p45 1 gray track

  8. Brick 15211 1ry 2ry 1ry

  9. Brick 15211 1ry mu e-pair e-pair + 1 gray track (slope>1) found by eye e-pair 1ry 2ry Momentum measurement of 2ry daughters : in progress

  10. Brick 71713 Parent (thin) (0.010, -0.297) Daughter (thin) (-0.546, -0.152) 0.3 -0.2 +20 GeV Backward (gray) ( 0.322, 0.455)

  11. Brick 82367 /// Calc Dmin ////////////////////////////////////////////// 0 seg itrk 2178 pl 44 id 228507 ph 27 33605.3 70200.6 -6800.2 0.0208 0.0922 1 seg itrk 5695 pl 45 id 300785 ph 23 33292.6 70466.7 -5442.9 -0.4547 0.2823 min distance = 4.2 um at -637.4 um upstream from pl 44 position = 33618.5 70259.4 -6162.9 ////////////////////////////////////////////////////////////// 2ry vertex Minimum distance = 4.2 micron Kink angle ( 0.475, 0.190) Parent (0.020, 0.092) 2ry daughter (gray) (-0.455, 0.282) 2.1 -1.1 +131 GeV

  12. Brick 98326 PL 53 54 55 56 57 Kink in PL 54 base Parent (-0.0295, 0.0045) Daughter (CS pred) (-0.1454 , -0.0967)

  13. Brick 30945 Daughter (black) ( 0.246, 0.260) Parent ( 0.059, 0.069) 3.3 -1.1 +3.5 GeV

  14. Summary 3.3 m track length measured. Analysis of 2ry interactions in progress. Increase statistics (total decay search length for NC in OPERA ~30m) Analysis of less than 30mrad kink with momentum measurement Prospect

  15. backup

  16. Followed track length for stop tracks (plates)

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