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

People involved: Mika Vesterinen, Laurent Dufour, J. Van Tilburg, S. Hellesund, D. Mueller.

Code

Code is available on GitLab in the "AsymmetryTools" subproject of semileptonics. https://gitlab.cern.ch/lhcb-slb/AsymmetryTools

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

Overall structured flow paper

Task	Order	Completed	Link to .pdf
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	-
Projected results and conclusion	5	No	-
Selection	1	Ongoing	-

Todo list

• 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.