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SVD2 software and performance H.Ishino (T.I.T.) 19th Nov, 2003 BGM

SVD2 software and performance H.Ishino (T.I.T.) 19th Nov, 2003 BGM. SVD2 software team SVD2 performance results with cosmic ray muon data w/o magnetic field internal alignment, intrinsic spatial resolution and hit efficiency. performances in the luminosity run

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SVD2 software and performance H.Ishino (T.I.T.) 19th Nov, 2003 BGM

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  1. SVD2 software and performanceH.Ishino (T.I.T.)19th Nov, 2003 BGM • SVD2 software team • SVD2 performance • results with cosmic ray muon data w/o magnetic field • internal alignment, intrinsic spatial resolution and hit efficiency. • performances in the luminosity run • data length, occupancy, cluster energy • MC studies • IP resolution • J/psi Ks events • Summary and schedule

  2. SVD offline software team • Basic software • Gsim (T.Hara) • calsvd (Ishino) • recsvd (Onuki, Kawasaki) • trak (Karim) • tsim (K.Hara, Ushiroda) • Monitor • DQM (Okuno) • QAM (Matsumoto, Kawasaki) • SVD_ME (K.F. Chen) • web (Ishino) • DATA quality check (Matsumoto, Takahashi, Kibayashi) • alignment (Maria, Takahashi, Kawai) • Low momentum tracking (Karim and tracking group) • Vertex • new algorithm (Mitaroff and Vienna people) • quality check (Lesiak, Shibata) • IP profile (Shibata)

  3. Straight track cosmic ray muons (internal alignment) x shift Two independent groups from Krakow (Maria san) and Tokyo (Takahashi san and Kawai san) are studying the SVD2 internal alignment. y shift Left figures show the comparisons of the internal alignment constants between the two groups. z shift The two constants are consistent within ~10mm. z shift difference Cosmic ray muon tracks were reconstructed using a stand-alone tracker (we did not use CDC track information.) By Maria san

  4. Straight track cosmic ray muons (spatial resolution) residual distributions before alignment after alignment x (rf) intrinsic spatial resolutions sx: 12.0±0.4mm Pitch size : 50mm +300mm -300mm +300mm -300mm z sz: 22.3±0.8mm Pitch size : 75mm by Takahashi san +300mm +300mm -300mm

  5. Straight track cosmic ray muons (Hit efficiency) a muon track hit or not? DSSDs expected hit efficiencies are obtained the inefficiencies are due to flex deficit, miss-wire bonding and malfunction of read-out chips by Matsumoto san

  6. Straight track cosmic ray muons (IP resolution) requiring 8 hits for each track very preliminary!!!! rphi: 18mm dr1 dr2 z: 19mm by Takahashi san

  7. Collision data quality data length : ~10kB per event DAQ system is working stably, i.e. no data deficit has been observed.

  8. A typical collision event Y Y Z x

  9. Time variation of occupancy for each layer 1st layer: ~10% 2nd layer: ~4% 3rd layer: ~2% 4th layer: ~2% In total ~3%

  10. Time variation of noise for each layer in a run with beam 1200~1400e without beam ~1100e 1st 3rd ~1400e ~1300e We have observed many backgrounds caused by the beam especially for the 1st layer. 2nd 4th

  11. A typical collision event Y Y Z x I' m full!

  12. Cluster energy distributions Clusters associated with tracks reconstructed by TRAK. peaking at 20000 electrons

  13. cluster energy distributions of each DSSD DSSD #0 (1st layer) DSSD #60 (3rd layer) miss-association to the background hits?

  14. MC studies for SVD2 performances (IP resolution) SVD1 MC rphi: 9.4+25.7/p mm rphi: 16.4+52.6/p mm z: 31.0+46.9/p mm z: 17.4+33.6/p mm by Karim san

  15. MC studies for SVD2 performances (J/y Ks) Reconstruction efficiency and vertex resolution have been estimated for J/y Ks events with a MC simulation. selection criteria: J/y→e+e- : -0.15<M-M(J/y)<+0.036GeV J/y→m+m- : -0.06<M-M(J/y)<+0.036GeV Ks→p+p- : -0.015<M-M(Ks)<+0.015GeV -0.04< DE<+0.04GeV Mbc > 5.27GeV no PID and flavor tagging. require SVD hits (2hits for z and 1 hit for rphi at least) by Shibata san and T.Hara san

  16. MC studies for SVD2 performances (J/y Ks) Improvement on the tag side vertex reconstruction Very preliminary results!

  17. Summary • SVD2 data have been taken successfully • With cosmic ray muon data without magnetic field • two independent groups perform internal alignment, giving consistent results within about 10mm. • intrinsic spatial resolution ~12(22)mm for rphi(z) • hit efficiency 95~98% • Very preliminary IP resolution ~18 (19)mm for rphi (z) • With beam collision data • data length ~10kB per event • Occupancy and noise is very high for the inner most layer. • Cluster energy distribution peaks at 20000 electrons. Much background contamination in the first layer. • MC studies show • IP resolution is much improved compared with SVD1 • J/y Ks : dz resolution 10%, recon. eff. 4% improvements.

  18. Plan • Internal alignment improvement and systematic studies with MC and real data (helix parameter correlation, delta z bias...) • We are waiting CDC constants. • CDC constants for Exp.31 will be finalized within 1 month? • global alignment • check SVD2 performance (Matching eff., IP resolution ... ) • Improvement of vertexing algorithm especially for tag side • adopted method proposed by Vienna group? • Data quality check to make data quality uniform. • Studies for physics analysis • reconstruction, vertex, systematics ... • The first physics results with SVD2 in the next summer.

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