1 / 16

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

zach
Télécharger la présentation

Status of Scan-forth for hadronic interaction background study

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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)

More Related