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Electron Tagging Possibilities with Current Data: Insights from Georg Steinbrück Meeting

Delve into the potential of electron tagging methods using current data from the Georg Steinbrück meeting. Explore tagging with jets, track projections, momentum resolution, and road techniques. Assess detector state for optimal results.

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Electron Tagging Possibilities with Current Data: Insights from Georg Steinbrück Meeting

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  1. Electron tagging possibilities with current data Georg Steinbrück B id meeting 14-Mar-2002

  2. Tracks • Reminder: tagging b jets with electrons relies on projecting tracks into the calorimeter and looking at calorimeter cells around the track: Road Method • Question: How well can we do with the current state of the detector and tracking • Specially: CFT axial only trackingh has to come from SMT • ptrel calculated from track momentum: Momentum resolution of these tracks? 14-Mar-2002

  3. SMT only (Monte Carlo) 14-Mar-2002

  4. SMT->CFT axial (Monte Carlo) • (h) = 0.003 s (Q)=0.003 • (z) = 2.7 mm s(f) = 0.003s(rf)=2.7 mm EM Cell size= 0.05x0.05 in (h,f) dz(Cell) = 4.6 cm at EM3 (91cm) and h = 0 d(rf) (Cell) = 4.6 cm Pointing well within a EM cell 14-Mar-2002

  5. Default global tracks (Monte Carlo) 14-Mar-2002

  6. y Other issues • SMT alignment 20-30 mm • ½ of SMT is shifted by 1mm • Shift of tracker wrt calorimeter: 2.9 cm in z • The last shift is comparable to the cell size and should/has to be dealt with. • Otherwise: Lower efficiencies • Calorimeter Cells in root tupleCould develop road method running at the root level: Might be hard. • rereco with that shift taken into account: p11 • Port into private version of p10? 14-Mar-2002

  7. y Other issues • Chpart_reco uses 401 tracks • in p10, 401 tracks choose best chi sq tracks: CFT only preferred over 11 hit tracks • Fixed in p11 until then: use 333 (SMTCFT) • Could rerun (private version of) chpart_reco in p10 with 333 tracks? 14-Mar-2002

  8. Momentum resolution • ptrel depends on px, py, pz of track. • E/p: Ia’s studies under way. Results encouraging • Avto’s studies look very encouraging: • J/Psi Mass resolution 50 MeV (pt>3 GeV) • Fake rates a few % (SMT only ~50%) 14-Mar-2002

  9. y Conclusion • Monte Carlo studies of angular resolutions suggest that the road method should perform well with SMTCFT (axial) tracks • Momentum resolution (important for ptrel) being studied: Probably ok • Might need to rereco p10 files because of z shift and 401 problem • electron tagging should be feasible with current data in p11: 401 tracks include 333 + 2.8 cm z shift taken into account • Started to look into p10 data: Should one try to make a private version of p10 with fixes? 14-Mar-2002

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