Slides for Xiaoping

1. Slides for Xiaoping

2. STAR TOF Offline Analysis Layout geometry (btofgeo) GSTAR geant hits STAR/TOF DAQ DB Tables StBTofUtil StBTofPool TOF Offline DAQ reader 1. StBTofHitMaker TOF Simulation Maker TOF Mixer Maker StBTofCollection StEvent StMcEvent 2. StVpdCalibMaker StBTofRawHit StBtofHeader association StBTofHit StMcBTofHit 3. StBTofMatchMaker MuDst TOF 4. StBTofCalibMaker BTofRawHit BTofHit BTofHeader StTrack StMuBTofUtil StMuDstMaker StBTofPidTraits STAR Collaboration Meeting

3. Offline software: BTOF chain (1) All BTOF production chain components are in place: • BTOF hit maker: • decodes TOF and VPD data • applies timing window cut, and first level of electronics calibration • provides TOF & VPD hits with TDC and “time-over-threshold” values • VPD calibration maker: • applies various calibration parameters to VPD hits • stores calibrated VPD hit info, as well as VPD-based z-vertex • BTOF match maker: • associates TOF hits with STAR tracks • provides accurate match positions • BTOF calibration maker • applies various calibration parameters to matched TOF hits • T0, slewing, local hit position • calculates common start time • adds particle ID traits to matched STAR tracks STAR Collaboration Meeting

4. Offline software: BTOF chain (2) • new BFChain options: • btofDat: runs BTOF Hit Maker, i.e. only decodes the data • vpdCalib, btofCalib: runs VPD or BTOF Calib Makers, i.e. only applies calibrations • btofMatch: runs BTOF Match Maker, i.e. only matches BTOF hits to STAR tracks • btof: runs the full BTOF chain, i.e. btofDat+vpdCalib+btofMatch+btofCalib • BFChains that implicitly include “btof”: P2010a, pp2010a • Other chains that implicitly include btofDat: Test.production2009_200Gev_Hi.ITTF, Test.production2009_500GeV.ITTF • Production QA histograms for Hit, Match, and Calibration makers • In progress: include BTOF hit information in PPV (Xin Dong)

5. BTOF Production Work Flow • Calibration production • requires STAR tracks and BTOF/VPD data • provides matched BTOF data (ROOT tree) to calibration experts • Hit+MatchStEvent/MuDSTntuple • could run on a smaller event sample, but accurate calibration relies on accurate matching (tracks!) and typically requires significant statistics • Run dedicated calibration algorithms • establish correction factors for, e.g. slewing and local hit position • verify calibration parameters and store parameters in database • Full STAR production with TOF particle ID • apply calibration database to the matched tracks. • involves the full chain, i.e.Hit+Match+Calib • but can also run as “after-burner” on existing StEvent/MuDST files STAR Collaboration Meeting

6. Run 9 calibrations • UPDATE THIS WITH NEW RESULTS THAT INCLUDE RFF DATA • Preliminary calibrations performed for 500GeV and 200GeV p+p data • based on small event samples • 3M @ 500GeV; 6.8M @ 200GeV • using Fast-Offline reconstruction chain • Insufficient statistics for channel-by-channel calibration • for the purpose of these calibrations bundled channels together in groups of 24 (=1 TDIG board) • Observe systematic worse time resolutions for channels >18,000 • software bug prevented INL (electronics) calibrations from being applied STAR Collaboration Meeting

7. RUN 9 200GeV pp Calibrations • Identified three periods that may need separate calibration efforts: • RFF (high TOF discriminator threshold) • 13M VPDMB events (day 114-146) , done • results readied for database • FF (high TOF discriminator threshold) • 5M VPDMB events (day 148-161), pending • FF (low TOF discriminator threshold) • 9M VPDMB events (day 162-179), pending

8. Calibration Results (UPDATE!!) STAR Collaboration Meeting

9. Calibration Requirements • [1] STAR Collab. Phys.Rev.C79 034909 (2009) STAR Collaboration Meeting