-- WillDavey - 06 Nov 2013


This is a list of open tasks in the Tau Working Group. All items can provide authorship qualification credits (pending final decision by PC/authorship committee). For many of the tasks, OTP credit can also be assigned. For tasks relevant to particular physics analyses, there is also a possibility to gain authorship on tau-related physics notes (H->tautau, H+->taunu, Zprime, SUSY with taus, SM, ...), to be decided by the physics groups.
Note that we are also open for suggestions beyond the list below. Please contact the tau conveners if you are interested in further discussing these tasks. Note that the tau trigger group is always look for volunteers as well.

Ongoing Support

tauRec developer ( CRITICAL )

Ongoing tauRec development/maintenance. Ideally long term ~1 year to ensure continuity and bridge into 2015 startup. Very generous OTP!

Needed Manpower: 1 person @ 0.5 FTE for 1 year period

Tau Physics Validation

Ongoing support for physics validation and code maintenance. Migration of the current tools to the xAOD framework in cooperation with tau software experts will also be required for r19 (early 2014)

Current Manpower: Guillermo Hamity, Lotte Thomson, Kieran Bristow (finishing)
Needed Manpower: 1 person @ XX FTE

Tau Production (DPD/xAOD)

Ongoing support for various tau related production. In addition will be important to ensure smooth transition into new xAOD data model.

Current Manpower:

  • Production Manager: Stan Lai
  • D3PD Maker: Nikos Rompotis, Almut Pingel, Aleksey Soloshenko
  • DESD: Chris Hays
  • Space Manager: Marcin Wolter
Needed Manpower: 1 person @ 0.3 FTE for D3PD production, ideally for 1 year period

Short-term tasks (by end of 2013)

Work should ideally be completed by the end of 2013 at latest. These tasks grant OTP and/or author qualification rights.

TauID Efficiency measurement

Final Tau ID efficiency measurement for 2013 (using Z tau tau tag-and-probe). Includes both standard template fit method and development of continuous BDT scale factors.

Current Manpower: Laurence Spiller, Gui Hanninger, Geng-Yuan Jeng

Track modelling

Compare track distributions in Z->mumu events, data and MC.

Current Manpower: Huan Ren

TES checks on gamma+jets or dijet events

Compare modeling of TES in MC and data, in particular for high-pt where no data-driven cross-checks have been done so far, and derive uncertainties

Current Manpower: Yang Heng

LS1 tasks (summer 2013 and onwards)

Long-term tasks in preparation for data-taking in 2015. Give OTP and/or author qualification rights.

Tau ID Development

Development, implementation and validation of Tau ID for r19. This includes selecting an optimal variable set, improving/implementing pileup corrections for the variables and retraining the BDT for a 'baseline' r19 Tau ID. In addition there will be further investigation into the use of sub-structure variables and the potential reoptimisation of the current variable definitions. The Tau ID will also need to be reoptimised using the Run 2 Geometry (incl. IBL).

Deadline: r19 (~March 2014)
Current Manpower: Aleksey Soloshenko, Almut Pingel (finishing), Pedro De Bruin, Anna Kopp
Needed Manpower: 1-2 persons @ XX FTE

Electron Veto Development

Development, implementation and validation of Electron Veto for Run 2. Essentially entails the same program as for Tau ID, but with additional investigation into the impact of dynamic TRT conditions.

Deadline: preliminary version mid 2014
Needed Manpower: 1 person @ XX FTE

Neutral Pion Reconstruction / Decay Mode Classification Development

Further developments, implementation, validation and maintenance of the cluster-based, cell-based, eflowRec and PanTau algorithms.

Current Manpower:

  • Cluster-based: Pawel Maleki, Quentin Buat
  • Cell-based: Benedict Winter, Stephanie Yuen
  • eflowRec: Mark Hodgkinson
  • PanTau: Christian Limbach (finishing)

Needed Manpower: 1 person @ XX FTE (PanTau developer)

Shrinking Cone Development

Development, implementation and validation of shrinking cone algorithm for charged and neutral pions.

Current Manpower: Rob Clarke

Conversion Tagging Development

Develop conversion tagging algorithm for use in tau reconstruction.

Deadline: preliminary version early 2014
Current Manpower: Mohamad Ayoub, Pierre Petroff, Dimitris Varouchas (finishing)

Tracking Development

Revisit tau track selection and TJVA, first at 8TeV, then for Run 2 conditions. This also includes investigation at high-pt, in particular to recover merged tracks, and potential development of the Multi Track Filter. The final optimisation of the tracking for use in Run 2 should also take into account the effect of additional algorithms such as conversion tagging and shrinking cone, which should help track selection/classification.

Deadline: preliminary version for r19
Current Manpower: Dirk Duschinger, Marco Milesi, Katharine Leney (finishing)

Substructure-based 4-momentum reconstruction

This will involve studying the best way to combine the sub-structure components, the development of a new method for the energy calibration, detailed studies of tails in the 4-momentum resolutions (due mainly to incorrect selection of sub-structure objects) and development of a pileup correction if necessary. The next step will be to develop a method to evaluate uncertainties on the 4-momentum (analogous to the TES uncertainty from Run 1, except may need a new approach).

Deadline: preliminary version early-mid 2014
Current Manpower: Zinonas Zinonos
Needed Manpower: 2 persons @ XX FTE

Standard TES calibration

Provide standard TES calibration for 8TeV and 13TeV DC14 production. This should include updated pileup corrections if available.

Deadline: r19 (~march 2014)
Current Manpower: Matteo Volpi (finishing?)
Needed Manpower: 1 person @ XX FTE

Tau Decay Mode Classification Efficiency measurement (development)

Run 2 decay mode classification will expand from 1p/3p to 1p0n/1p1n/1pXn/3p0n/3pXn. Much of the reconstruction will rely on this decay mode classification, especially the new sub-structure based 4-momentum reconstruction. This classification is no longer only dependent on tracking but on a number of sophisticated sub-structure algorithms, so it will be important to accurately measure the classification quality in data. The measurement will most likely be an extension to the Ztautau tag and probe ID efficiency measurement.

Needed Manpower: 1 person @ XX FTE

Tau ID data/MC comparisons

Compare BDT/LLH and input variables (including new sub-structure variables when available) in various phase space regions, in particular high eta and various MET requirements. Ideally, replace mis-modeled variables by similar but more robust variables in time for DC14 production. Would then be useful to quickly reperform studies on DC14 production as validation. Studies on real and fake taus are envisaged.

Deadline: preliminary studies to tune algs prior to DC14 (~march), then a repeat of the studies on the DC14 production itself.

Z->tautau tag & probe (real taus):

  • Needed Manpower: 1 person (previous manpower: Romain Madar, Pawel Malecki still interested?)

Z->mumu tag & probe (fake taus):

  • Current Manpower: Bonn Student (to verify)

DC14 Tau ID/TES/eVeto Measurements

As part of DC14 we will re-run the standard Tau ID efficiency and insitu. TES measurements, demonstrating our ability to produce results on the xAOD format. The first component will be to setup the xAOD reduction framework for selecting Ztautau events. The next component will be to reperform the old Tau ID/TES measurements, migrating the analysis code to run on the xAOD output where necessary, with the goal to ensure a smooth transition into Run 2 data-taking. Undertaking the same program for the electron-veto measurement would also be helpful if manpower is available.

Needed Manpower: 2-3 persons @ XX FTE

Migration/Development of Tau Packages for DC14 (xAOD data model)

A number of packages such as: TauCorrUncert and the Tau Physics Validation tools need to be migrated to the xAOD framework. In addition, there is a growing need for a common set of ATLAS analysis tools, like Physics Object selectors which may need to be developed for taus.

Deadline: DC14 (~march 2014)
Needed Manpower: 1 person @ XX FTE

Detector-level corrections for taus in AF-II

Derive detector-level corrections for taus in the Atlfast-II fast simulation. It will also be important to investigate how well the new sub-structure reconstruction is modelled in AF2.

Current Manpower: Christopher Bock, Romain Madar (still working on this?)

Longer Term

Current these topics have no manpower assigned:
  • Prepare uncertainty estimation for standard calorimeter based TES. May need preliminary single-particle response before insitu available.
  • Develop method to evaluate uncertainties on sub-structure components (eg. on the charged/neutral fractions for polarisation studies etc...)
  • Investigation into the potential for W->taunu / ttbar tag and probe measurements in Run 2.
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Topic revision: r4 - 2013-11-10 - AttilioAndreazza
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