Electron tagging possibilities with current data
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Electron tagging possibilities with current data. Georg Steinbr ü ck B id meeting. Tracks. Reminder: tagging b jets with electrons relies on projecting tracks into the calorimeter and looking at calorimeter cells around the track: Road Method

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Electron tagging possibilities with current data

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Electron tagging possibilities with current data

Electron tagging possibilities with current data

Georg Steinbrück

B id meeting

14-Mar-2002


Tracks

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


Smt only monte carlo

SMT only (Monte Carlo)

14-Mar-2002


Smt cft axial monte carlo

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


Default global tracks monte carlo

Default global tracks (Monte Carlo)

14-Mar-2002


Other issues

  • 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


Other issues1

  • 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


Momentum resolution

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


Conclusion

  • 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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