Muon reconstruction in release 14.2.0.1

D. Adams
July 2008

Release 14.2.0.1 is for vlaidiation--14.2.10 will be used for production.

For other releases, see the complete list of results.

Issues in 14.2.0

1. Hole counts are absent for muid and staco combined.
  • Hole counting is not enabled in 14.0.X reconstruction.

    2. Muid combined fit chi-square does not include the inner track. Staco includes inner, outer and match.
  • Users should add Muid inner and combined chi-squares (and DOF's) to get comparable values.
  • This is a feature, rather than a bug.

    3. Calorimeter-tagged muons all have energy loss set to zero.
  • Feature?
  • Same in 14.0, 14.1

    4. Staco efficiency drops by 2% with new geometry (ATLAS-GEO-01-0X-00).
    Plots.
    Bug report.
    Problem is in the CSC.
    Fixed in 14.2.10 with ATLAS-GEO-02-00-00.

    5. Calorimeter-tagging algorithms have very low efficiency in ATLAS-GEO-01-01-00 because of tight impact parameter and impact parameter significance cuts.

    6. Calorimeter isolation falls by about 10% relative to 14.1. This is probably due to improvement of the isolation tool. (Samira, private communication 16jul08).

    7. The calorimeter-tagging algorithms have a big efficiency loss and fake rate increase in the high luminosity sample.

    8. MuGirl has a significant efficiency loss and fake rate increase in the high luminosity sample.

    9. The standalone and combined algorithms now use specific author indices instead of highPT. The spectrometer-tagging algorithms still use lowPt.

    Graphical summaries

    T1 history
    T1 validation
    Z->mumu validation

    dladams@bnl.gov