LHCTopWG - LHC Top Physics Working Group

This is the public home page of the LHC working group on Top Quark physics. The mandate of the group can be found here: Mandatev8.pdf, and the agreement of the four experiments on how to proceed in general for Tevatron/LHC combinations is found here: https://twiki.cern.ch/twiki/pub/LHCPhysics/LHCTopWG/Tevatron_LHC_Combos_Final-2.pdf

Structure and organization of the group

The activity of the working group is coordinated by one contact person per experiment, who maintain close contact with the four top group conveners of ATLAS and CMS, and one contact person for the theory community. The LHCTOPWG is fully integrated in the activity of the LPCC.

  • Contact person for CMS: Martijn Mulders
  • Contact person for ATLAS: Mark Owen
  • Contact person for LHCb: Steve Farry
  • Contact person for TH: Michelangelo Mangano
  • Current CMS top conveners: Maria Aldaya, Florencia Canelli
  • Current ATLAS top conveners: Reinhard Schwienhorst, Lisa Shabalina

Former coordinators of the group: Roberto Chierici (CMS), Markus Cristinziani (ATLAS), Maria Costa (ATLAS), Alison Lister (ATLAS)

The LHCTOPWG is organised in subgroups, each corresponding to the combination effort for a certain measurement. Each subgroup has a contact person per experiment (obviously member of the group), responsible for providing the combination and the relevant documentation. The complete mandate of the subgroup contact person can be found here.

The current structure is as follows:

Working groups

  • Top pair cross section: Barbara Alvarez Gonzalez (ATLAS), Jan Kieseler (CMS)
  • Single top cross section: Carlos Escobar Ibanez (ATLAS), Nadjieh Jafari (CMS), Jeremy Andrea (CMS)
  • Top mass: Mark Owen (ATLAS), Steve Wimpenny (CMS)
  • Charge asymmetry: Frederic Deliot (ATLAS), Thorsten Chwalek (CMS)
  • Differential distributions run 1: Francesco Spano (ATLAS), Maria Aldaya (CMS)
  • Differential distributions run 2: James Howarth (ATLAS), Otto Hindrichs (CMS)
  • Top quark pair production in association with Z or W: Markus Cristinziani (ATLAS), Andrew Brinkerhoff (CMS)
  • Effective field theory contacts: Nuno Castro and Oliver Maria Kind (ATLAS), Nadjieh Jafari and Alexander Groshjean (CMS)
  • W helicity: Mohammad Kareem (ATLAS), Mara Senghi (CMS)

While the work of the working group remains experimental in nature, close contact with the theory community is mandatory. Theory members of the group can be invited to attend closed meetings.

With the working groups, task forces with persons representing both experiments are often formed to attack a particular issue of relevance for the combination activities of the working group. The task forces that have been active to date in the LHCTOPWG are:

  • Jet/MET: for a proper grouping of the systematic sources related to JES uncertainties. Contributing persons: Steven Schramm and Dimitris Varouchas (ATLAS), Anastasia Karavdina, Henning Kirschenmann and Mikko Voutilainen (CMS)
  • Common acceptance and pseudo-tops: for defining common conventions for a pseudo-top definition and acceptance where both experiments should quote fiducial cross sections. Contributing persons: Kevin Finelli and Dominic Hirschbuhel (ATLAS), Junghwan Goh, Orso Iorio and Mara Senghi (CMS).
  • Radiation and generators: for comparing the definition of systematic sources coming from the modelling of radiation in the MC, and in general for generator settings in the two experiments. Contributing persons: James Ferrando and Dominic Hirschbuhel (ATLAS), Benedikt Maier and Markus Seidel (CMS)
  • b-tagging: for a proper grouping of the systematic sources related to b-tagging. Contributing persons: Martin zur Nedden and Liza Mijovic (ATLAS), Luca Scodellaro (CMS)

Useful links and mailing lists

  • svn area: svn+ssh://svn.cern.ch/reps/toplhcwg

Hot Topics

Here there is a collection of links to very useful Twiki pages where all recommendations by the working group are documented and discussed. Please refer to those for preparing your analyses !

The following are instead links documenting studies performed by the WG and that are of general interest

  • Coming soon: comparison of differential distributions


Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf Mandatev8.pdf r1 manage 48.4 K 2014-02-18 - 13:39 RobertoChierici  
PDFpdf Tevatron_LHC_Combos_Final-2.pdf r1 manage 40.3 K 2014-02-18 - 13:41 RobertoChierici  
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Topic revision: r50 - 2018-05-18 - MartijnMulders
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