Method for the determination of hadronic tracking efficiencies using partially reconstructed charm decays.

People involved: Mika Vesterinen, Laurent Dufour, Jeroen van Tilburg, S. Hellesund, D. Mueller.

Note

The latest version of the note can be found at https://svnweb.cern.ch/cern/wsvn/lhcbdocs/Users/ldufour/Velo2Long/latest/latex/main.pdf

Code

All code is available on GitLab in the "AsymmetryTools" subproject of semileptonics. In there there is the "Velo2Long" in "projects". https://gitlab.cern.ch/lhcb-slb/AsymmetryTools

In order to compile:

(checkout the project)
source setenv.sh
cmake .
make
make install

Earlier documentation

"Measuring pion and kaon tracking efficiencies and asymmetries using charm decays with one partially reconstructed track" (S. Hellesund) LHCb-INT-2014-041

"Measurement of the Kaon Detection Asymmetry using Double-tagged Partially Reconstructed D0 Decays" (D. Mueller) LHCb-INT-2013-054

Data samples

* Location: /eos/lhcb/user/l/ldufour/Velo2Long contains (2012, 2015) 4-body and (2015, 2016) 2-body samples.

Monte Carlo samples

Large MC samples to be generated a.s.a.p.

BKK paths:

Signal

• 27163003: 2012 conditions, Pythia 6 & 8, 2-body mode, DecProdCut
  • sim08a: evt+std://MC/2012/27163003/Beam4000GeV-2012-MagDown-Nu2.5-Pythia8/Sim08a/Digi13/Trig0x409f0045/Reco14a/Stripping20NoPrescalingFlagged/ALLSTREAMS.DST 3.5M events
  • sim08e: evt+std://MC/2012/27163003/Beam4000GeV-2012-MagDown-Nu2.5-Pythia8/Sim08e/Digi13/Trig0x409f0045/Reco14a/Stripping20NoPrescalingFlagged/ALLSTREAMS.DST 140k events
  • sim08h: evt+std://MC/2012/27163003/Beam4000GeV-2012-MagDown-Nu2.5-Pythia8/Sim08h/Digi13/Trig0x409f0045/Reco14c/Stripping20NoPrescalingFlagged/ALLSTREAMS.DST 1M events
  • sim09a: evt+std://MC/2012/27163003/Beam4000GeV-2012-MagDown-Nu2.5-Pythia8/Sim09a/Digi13/Trig0x409f0045/Reco14c/Stripping20NoPrescalingFlagged 1M events

• 27163008: 2012 conditions, Pythia 6 & 8, 2-body mode, TightCut
  • sim08a: evt+std://MC/2012/27163008/Beam4000GeV-2012-MagDown-Nu2.5-Pythia8/Sim08a/Digi13/Trig0x409f0045/Reco14/Stripping20NoPrescalingFlagged/ALLSTREAMS.DST 2M events
  • (the other one is stripping filtered)

• 27265000: 2012 conditions, Pythia 6 & 8, 4-body mode, DecProdCut (low statistics?)
  • sim08a: evt+std://MC/2012/27265000/Beam4000GeV-2012-MagDown-Nu2.5-Pythia8/Sim08a/Digi13/Trig0x409f0045/Reco14a/Stripping20NoPrescalingFlagged/ALLSTREAMS.DST 1.3M events

Background

• 27163400: 2012 conditions, Pythia 8, DecProdCut, mode: K pi pi0
  • sim08f: evt+std://MC/2012/27163400/Beam4000GeV-2012-MagDown-Nu2.5-Pythia8/Sim08f/Digi13/Trig0x409f0045/Reco14a/Stripping20NoPrescalingFlagged/ALLSTREAMS.DST 5M events
• 27173001: 2012 conditions, Pythia 8, DecProdCut, mode: K mu nu (semileptonic D decay)
  • sim08d: evt+std://MC/2012/27173001/Beam4000GeV-2012-MagDown-Nu2.5-Pythia8/Sim08d/Digi13/Trig0x409f0045/Reco14a/Stripping20NoPrescalingFlagged/ALLSTREAMS.DST 2.5M events

Overall structured flow paper

Task	Order	Completed	Link to .pdf
Selection	1	Ongoing	-
Fit model	2	No	-
Resolution and bias studies	2	No	-
Raw asymmetry and efficiency dependencies	3	No	-
VELO efficiency determination	4	No	-
Comparison with other methods	4	No	-
Comparison to Monte Carlo	5	No	-
Projected results and conclusion	5	No	-

Todo list

• Generate MC samples for background and signal.
• Create OVERLAP functor taking ChildSelector arguments.
• Verify that the MatchLong efficiencies are the same as the StdAllNoPIDPions container
• Verify the L0 GLOBAL TIS condition for the 2016 data set.
• Run anti-isolation for the 2-body mode.
• Run a toy study: is there a bias in the actual momentum from the DTF?
• Plot the momentum resolution from DTF.
• Actually get the VELO efficiencies in.
• Create pointing mass functor (desirably taking ChildSelector arguments).
• Find out the anomalous asymmetry for very low momentum pions.
• Fit in bins of nTracks in one fixed bin of momentum

Earlier presentations

• "New D∗-based tracking efficiency method using the turbo stream", S&A week 12-07-2016.
• "Detection asymmetries on turbo with persist reco", T&A meeting, 26-05-2016.
• "Detection efficiencies on turbo with persist reco", HLT operations meeting, 13-05-2016.