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Progress and Challenges in MDC4 Reconstruction: Software Stability and New Developments

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The MDC4 reconstruction software has shown promising stability and performance, with new features performing well despite some lingering issues. Notably, the TPC-SVT matcher (EST) operates successfully, even with limited SVT layers. However, detailed diagnostics are still pending, and several issues remain unresolved. EVR upgrades have improved efficiency, particularly at low multiplicities, but alignments and calibration testing are ongoing challenges. Overall, while the progress is significant, caution is advised for heavy-ion users and attention to unresolved issues is necessary.

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Progress and Challenges in MDC4 Reconstruction: Software Stability and New Developments

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  1. MDC4 Reconstruction • Good news • Relatively stable/smooth operation of software • Things which were expected to break did not • New stuff put in recently performed well • Bad news • We still lack a detailed look at things • Some issues remain to be resolved • But it is doable • Calibrations cannot be tested here but knowledge accumulates S. Margetis

  2. New Reconstruction Software • (Beyond detector level) • TPC-SVT matcher (EST) in place • It works nicely (even with only 3-SVT layers) • Needs some tuning (secondaries) • Primary (pseudo) Kalman fit • Used for first time on large production in MDC4 !! • Looks similar to year-1, as expected • Open issues still remain but all doable S. Margetis

  3. New Reconstruction Software (2) • EVR upgrades • Better efficiency/better vertex at low multiplicity • Some minor issues should be discussed/resolved • “global” handshaking • Needed careful coordination • Still needs work on alignment (transforms?) with data • Stability is near but not here! S. Margetis

  4. EVR updates (by L.Ray) • Bottom line is • Details in /protected/reco/ray/evr_testresults_April2001.html • New low multiplicity efficiency is factor of 2 up but it still misses a lot of good events • We might have to re-install LMV even if it overdoes it • Peripheral group needs these events • Heavy Ion users should use carefully events with <20 primaries • Use of beam position knowledge keeps x,y reco sigmas almost flat over all multiplicities • This is an optional switch S. Margetis

  5. EVR updates (2) • For MDC4 resolution is as expected ~50um • Issues (EVR is the messenger, do not shoot him!) • S-shape of reconstructed vertex z-position • This is a recent feature • It shows up in simulations, not ‘calibration’ • Not clear origin but closing down • LMV reinstallation S. Margetis

  6. New Primary Fit (A. Saulys, W. Deng) • First time in large production in MDC4 • Identical so far for year-1/year-2 • Kalman propagation to vertex neighborhood • Constrained fit to vertex • ‘GEANT’-look up of material/energy loss • Not yet implemented for global tracks in year-2 • But in the works together with use of dE/dx info S. Margetis

  7. New Primary Fit (2) • It is not a miracle performer but • It does a better job than the one before • Energy loss seems to be corrected • Chi2 peaks around 0.9 for data at best • It peaks around 0.7 for TRS simulations • Momentum resolution trends as expected. S. Margetis

  8. New Primary Fit (3) • Issues • TRS/Data chi2 needs to be resolved • Hit error systematics might have to be revisited again after all calibrations are done • Use dE/dx info in both years (coming) • Extend ‘GEANT’ trick to account for SVT in global S. Margetis

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