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Data Reprocessing in Particle Physics: Challenges and Solutions

Explore the complexities of reprocessing 2001-2002 and 2004 data in particle physics, detailing reconstruction processes like DBV 12-20 and DST updates. Understand the benefits of reprocessing, complications faced, and necessary steps to initiate the process. Discover the impact on analysis, Monte Carlo (MC) compatibility, and the importance of scripting for batch reprocessing queues. Address issues with dead-wire lists, thickness of DC wall, and drift time considerations. Delve into MC development topics, including accidental cluster rates, noise in DC, and calibration challenges in EmC simulation.

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Data Reprocessing in Particle Physics: Challenges and Solutions

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  1. Reminder: Why reprocess? • 2001-2002 data • Reconstruction: DBV 12-14 • DSTs: DBV 14-16 • 2004 data • DBV-19 for reconstruction & DSTs, Run < 31690 • DBV-20 for Run > 31690 • What is gained by reprocessing? • What complications arise? • Analysis/MC compatibility, etc. • What needs to be done to start?

  2. Datarec changes DBV-14  19 • dE/dx code for all streams (2002 data) • DEID bank • FILFO bias sample • No BHABREJ cut in FILFO • Downscaled golden Bhabha sample • Many bha files deleted from tape library • kpm stream - old algorithms eliminated, new dE/dx algorithm • ksl stream - new KSTAG • rad stream - min bias sample • clb stream - bug fixes • Bug fixed in dE/dx integration in VTXFIN (DBV-16) • Mainly affects kpm stream: 2907 dkc DSTs < DBV-16

  3. DBV-19  20 and beyond • DBV-19  20: • s, boost values from HepDB BMOM(3) for all EvCl routines • Technical points that don’t impact reconstruction quality • Also true for DBV-14  19 lists: not included • Further changes for DBV-21: • Problems with dead-wire lists • Thickness of DC wall -75 µm • Cut DC hits with drift times > 2.5 µs • Modifications to ppg streaming code

  4. More reprocessing issues • MC compatibility: • Does reprocessing with a new version of datarec imply • re-reconstructing MC files? • reprocessing MC DSTs? • Scripting: • Need work on scripting to reprocess on batch queues

  5. MC re-reconstruction? • MC re-reconstruction possible • Minor work on scripting needed • Impact of dead-wire lists: • Re-reconstruction of much/all 2001-2002 MC • Dead wires not masked for data reconstruction • Re-reconstruction of much/all 2004 data • Dead wires masked in 2004 data reconstruction • No issue concerning MC compatibility in this case

  6. MC development: Minor topics BP geometry for 2004 rp generator LSB insertion code CSPS/CELE element correspondence (?)

  7. MC development: Major topics • 1. Accidental cluster rates (SM) • 2 weeks for module to delete excess clusters • 6 weeks to reprocess MC DSTs if needed • 2. Correlated noise in DC for charged kaon tracks (PDS) • Problem and solutions under study • 3. Regeneration/nuclear interactions (MA, GL) • Problem and solutions under study • 4. Energy scale calibration for EmC simulation (PG) • Problem and solutions under study • 5. DC tracking resolution (MM) • 2 months to reparameterize errors and study resolution • Need significant input for P. de Simone • 6. EmC time distribution (CG) • Report this meeting

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