Transcript Document
Visual checking of Muon Reconstruction using Atlantis Gary Taylor (UCSC) 1/4/2003 Atlantis • General purpose interactive event display program • Concentrate here on its application to muon track reconstruction Outline • • • • • • MDT, RPC, TGC, CSC Digits Moore tracks Matching muon tracks to inner detector tracks Future plans Conclusions Short demonstration 130 GeV Higgs decaying to 4 muons (all reconstructed by Moore) RPC TGC MDT unassociated MDT associated 1 TeV Pt Muon reconstucted in the barrel region RPC Moore tracks not yet followed in B field MDT associated MDT unassociated 1 TeV Pt Muon reconstucted in the endcap region MDT TGC space points MDT hits not long enough TGC strips 1 TeV Pt muon reconstructed with 2.5GeV Pt – Why? MDT hits on Moore track Unused MDT hits near true track 1 TeV m CSC hits on Moore track 1 TeV Pt muon not reconstructed – Why? MDT hits too short ? 130 GeV Higgs decaying to 4 muons (only 2 reconstructed by Moore) 2 muons (Pt = 24 and 35 GeV) Some minor bugs found in the geometry 7/BIL/-1/5/MDT/2/3/13 Comparison of muon and inner detector track fits f p = 28 GeV Dp = 5 GeV Df = 1.5 deg Dh = 0.02 muon tracks Inner detector tracks p = 25 GeV Dp = 4 GeV Df = 1 deg Dh = 0.01 V-Plot allows comparison of f, h and pt h Near term future plans (muon data) • follow Moore tracks in B field • follow true (kine) muon tracks in B field • add true (kine) track-to-hit association • add data from CSC’s clusters • change to use compact identifiers Conclusions • many aspects of muon reconstruction may be checked using Atlantis • remaining muon data available soon (when in Athena) • followed by new public release • users and their feedback/requests are very welcome • to learn more - sign up for Atlantis tutorial on Friday 16th May (next software week) Special thanks to • Hans Drevermann (Ideas and advice) • Jon Couchman (Access to data from Athena –JiveXML) Explanation of the fh and V-Plot projections f r = rMax V-Plot Draw each space point twice at F,h+k*(r-rMax) and F,h-k*(r-rMax) r = 2 cm h low p, -ve Distorted V’s track not from IP high p, +ve 3D information For tracks can judge •f •h • pt (slope of V arms) • charge ( L -ve V +ve)