Common Particles


Please discuss the changes at Task 21560.

Proposed changes wrt DaVinci v28r4p1

We propose a series of changes that should have little effect on physics (or for the better), align the stripping more with the HLT, and improve the stripping timing and rate.

All the changes proposed in this page are open for discussion. We would like to introduce as many as possible in Stripping16, to allow testing on August data. Things can still change for September data. See Patrick's presentation at 19/7/2001 PPMTS. In short we suggest the following changes, committed to svn revision 126155:

  • New Default Tracking cut removing clones on all Tracks.
  • New default PT>250MeV and IPCHI2>4 cut for all charged basic
  • Added new StdAllLooseXxx and StdAllNoPIDsXxx (Xxx=Pions,Muons,Kaons,Protons,Electrons) and StdAllVeryLooseMuons that do no implement PT>250MeV and IPCHI2>4 cut
  • Changed StdLooseXxx, StdNoPIDsXxx and StdVeryLooseMuons to use the new particles and implement the new default cuts . WARNING : Now all StdLooseXxx and StdNoPIDsXxx have PT>250MeV and IPCHI2>4

  • The following intermediate states have been changed to use the new StdAll particles, Hence they are still behaving like before:
    • StdLooseDiElectron
    • StdLooseDiMuon
    • StdLooseDiMuonSameSign
    • StdLooseDstarWithD2HH (only slow pion)
    • StdLooseJpsi2ee
    • StdLooseJpsi2MuMu
    • StdMassConstrainedJpsi2MuMu
    • StdVeryLooseDiMuon

  • Remove all ADOCACHI2 cuts now useless because of LoKi::VertexFitter use.

Effect on Reco09 data

Running Stripping15 with all streams except the MB stream on 100k events of $STRIPPINGSELECTIONSROOT/tests/data/, with DaVinci v28r4p1 with Phys/CommonParticles r126155:

  • The timing is reduced from 250 to 188 ms/event. The reduction is across the board. For instance D+ -> Kpipi goes from 3.2 to 2.5 ms/event, etc...
  • Rate per stream
Stream v28r4p1 r126155
Dimuon 1543 1215
Dielectron 175 103
Semileptonic 515 448
Bhadron 1620 1052
EW 1054 639
Radiative 119 55
Calibration 2680 1925
CharmCompleteEvent 1995 1382
Charm 4577 4008
Leptonic 2815 2530
PID 1624 1062

In average the rate is 1/4 lower.

Effect on Reco11 data

To be filled in

How to test

DaVinci v25r4p1 and Phys/CommonParticles r126097.

The reco11 test sample is now broken. Hopefully it will come back soon.

-- PatrickSKoppenburg - 19-Jul-2011

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Topic revision: r3 - 2011-07-20 - PatrickSKoppenburg
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