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Barrel EMC and SMD Status Tables

Barrel EMC and SMD Status Tables. Oleksandr Grebenyuk, NIKHEF. Outline. Tower status determination criteria Result – set of tower status tables (2003 d-Au and p-p runs) SMD strip status determination criteria Result – set of SMD status tables (2003 d-Au run)

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Barrel EMC and SMD Status Tables

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  1. Barrel EMC and SMDStatus Tables Oleksandr Grebenyuk, NIKHEF

  2. Outline • Tower status determination criteria • Result – set of tower status tables(2003 d-Au and p-p runs) • SMD strip status determination criteria • Result – set of SMD status tables(2003 d-Au run) • Tower status for 2004 Au-Au 62GeV run • Tower status for 2004 p-p run • Summary STAR Analysis Meeting, BNL

  3. BEMC Tower Status Criteria • Pedestal shape (σ, position, height) • Number of signal hits / event above PED+6σ Good tower ADC spectrum (5K d-Au events) Threshold for signal fraction calculation: 6σ above pedestal Pedestal peak + Gaussian fit ADC STAR Analysis Meeting, BNL

  4. BEMC Tower Status Criteria Pedestal shape d-Au No pedestal ADC Pedestal is too broadσ> 3 ADC STAR Analysis Meeting, BNL

  5. BEMC Tower Status Criteria Signal fraction d-Au 0.001 ADC 0.001 < signal fraction < 0.03 for d-Au 0.00015 < signal fraction < 0.01 for p-p Example:No signal, pedestal only STAR Analysis Meeting, BNL

  6. Legend: Cold Off Bad BEMC Tower Status – 2003 d-Au Bad towers: 240 (10%) STAR Analysis Meeting, BNL

  7. Legend: Cold Off Bad BEMC Tower Status – 2003 p-p Bad towers: 453 (19%) STAR Analysis Meeting, BNL

  8. BSMD Strip Status Criteriafor 2003 d-Au (by Martijn Russcher) • Pedestal shape (σ, position) • Signal fraction: above PED+20 or PED+4σ Good strip ADC spectrum, 25K d-Au events ADC STAR Analysis Meeting, BNL

  9. BSMD Strip Status Criteria Pedestal shape No pedestalmany zeroes Pedestal is too broad σ > 5 Negative pedestal not always a problem ADC ADC ADC STAR Analysis Meeting, BNL

  10. BSMD Strip Status Criteria Signal fraction Number of hits / event above PED+20 or PED+4σ if σ>5Fixed threshold used to make it flat in η while σ changes 0.0002 < signal fraction < 0.005 No signal, pedestal only ADC STAR Analysis Meeting, BNL

  11. Day Strip ID BSMD-eta Strip Status – 2003 d-Au Colour-coded status, bad when >3 White: data not analysed Bad strips: 1400 (16%) STAR Analysis Meeting, BNL

  12. Day Strip ID BSMD-phi Strip Status – 2003 d-Au Colour-coded status, bad when >3 White: data not analysed Bad strips: 900 (10%) STAR Analysis Meeting, BNL

  13. 2004 Au-Au 62GeV RunTower Status By Thorsten Kolleger: - Similar set of quality checks - 8.4% of bad towers - BEMC was quite stable (within 0.1%) STAR Analysis Meeting, BNL

  14. 2004 p-p RunTower Status By David Relyea: - Similar set of quality checks - Small fraction of data analysed - 15-20% of bad towers STAR Analysis Meeting, BNL

  15. Summary • Tower status tables produced • 2003 d-Au and p-p • 2004 Au-Au 62GeV and p-p • SMD status tables produced • 2003 d-Au • 2003 d-Au tower and SMD status tables were checked in π0 analysis (both real data and MC simulation) and put into DB STAR Analysis Meeting, BNL

  16. The End STAR Analysis Meeting, BNL

  17. Module front view Δφ = 6˚ Tower 30 cm SMD PSD 23 cm STAR Analysis Meeting, BNL

  18. BEMC Tower Status – d-Au Some cleanup: • No signal at a certain run  good at that run • Signal fraction ~ threshold  cold all the time • Bad > 20% of time  bad all the time • No signal > 50% of time  cold all the time + 120 bad towers from 2003 LED test(Stephen T., Alex St.) STAR Analysis Meeting, BNL

  19. BEMC Tower Status Tables Status table: array of status codes (one per tower) with timestampused in reconstruction, simulation and efficiency/acceptance calculations • 2003 d-Au: • 48 tables / 84 days: exact detector status • 1 table for d-Au: ~0.5% acceptance uncertainty • 2003 p-p: • 100 tables / 67 days: exact detector status • 1 table for p-p: ~1.5% acceptance uncertainty STAR Analysis Meeting, BNL

  20. BSMD-eta PED+20 vs. PED+4σ η η η STAR Analysis Meeting, BNL

  21. BSMD-phi PED+20 vs. PED+4σ STAR Analysis Meeting, BNL

  22. Legend: MinBias HighTower1 HighTower2 π0 analysis with 2003 d-Au status tables - Improvement in the π0 invariant mass spectrum - MC simulation gives 76% detector acceptance Inv. mass spectrum with default status tables With these tables STAR Analysis Meeting, BNL

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