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Background studies in the VXD: status and future plans

Background studies in the VXD: status and future plans. R. De Masi , S. Aplin, F. Gaede, M. Winter, …. Present status. Several studies from DESY, Strasbourg, Warsaw, … on the expected hit rate. First estimate of occupancy for two sensor types.

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Background studies in the VXD: status and future plans

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  1. Background studies in the VXD: status and future plans R. De Masi, S. Aplin, F. Gaede, M. Winter, …

  2. Present status • Several studies from DESY, Strasbourg, Warsaw, … • on the expected hit rate. • First estimate of occupancy for two sensor types. • Development of a detailed digitizer (Warsaw).

  3. Hit rates (LDCPrime_02Sc_p01 VXD-SL)

  4. How to get to the occupancy… transverse path length particle track path length sensitive volume ladder side view # seed pixels = plT / pitch size # pixels in cluster = 2 x #seed pixels + 4

  5. … with two different options Standard parameters Modified parameters 50 m epi 15 m epi larger clusters Layer pitch (m) integration time(s) pitch (m) integration time(s) 1 25 50 20 25 2 25 200 25 50 3 25 200 33 100 4 25 200 33 100 5 25 20033 100 Layer occupancy occupancy 1 0.059 0.015 2 0.027 0.005 3 0.007 0.004 4 0.003 0.002 5 0.001 0.001

  6. Seed pixel distributions Standard mean = 4.7 Modified mean = 2.4 zoom

  7. This implies … • Occupancy ranges from ~6% to 1.5% (with anti-DID) not accounting for any safety factor. • Its impact on the tracking efficiency needs to be investigated according to the IDAG request for June (and on heavy-flavour tagging later) . • The present status of reconstruction software does not allow for a complete treatment of the bkg in a straight way. • Address tracking issues and vertexing issues separately

  8. Next steps • Optimisation of tracking algorithm (ghost tracks). • Hit to cluster conversion. • BKG-physics clusters discrimination. • Cluster-track association. • Consequences on impact parameter resolution. • Tagging. • lowP, …. • mid-term program

  9. For the IDAG meeting • STEP0: • Use of salt&pepper bkg hit distribution convoluted with realistic cluster dimensions. • Preliminary study based on bkg clusters only in the innermost layer (against ghost tracks). • STEP1 • Overlay GuineaPig hit with realistic cluster dimensions. • SL or DL geometry?

  10. Cluster dimensions (standard)

  11. Cluster dimensions (modified)

  12. To be discussed • Goals & timelines. • Task sharing.

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