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Strange Quark as a probe for new physics in the Higgs Sector

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Nov. 24th 2020 

We went around all the presentations on the agenda (check them out for details) and around to table to get to know each other very quickly.

A few notes from the discussion:

  • For the s-quark decay chain, IP information helps to discriminate it from b/c decays, but the problem with u/d separation remains. In that case, the momentum helps (higher momentum in hadrons from strange quark wrt u/d)
  • KLong (not really included in existing studies because they shower before decaying - to double check whether it is used in arxiv.2003.09517v1)
    • Certainly interesting aspect to look into, but it might require checking the shower shapes, so going even a level down in the ILC sample generation steps
  • Independently of how many layers we have, time (through TOF analysis) does not really help - even with ~0ps resolution, we would get pi/k ID not beyond 9 GeV or so
  • dE/dx in TPC is more promising (covers a large momentum range - remember for us it is relevant to get PID beyond 20 GeV or so because the leading track takes 20% of the jet momentum, so we are looking at ~4GeV tracks 
    • Trying to include info on dE/dx in the ILD FTag algorithms and extend them to tag strange jets
  • SLD strange asymmetry paper should be looked at again for hints on discriminating variable which can them be re-used in our case
  • Some useful references on FTaggers at FCC: The FCC-ee presentation is this: https://indico.cern.ch/event/932973/contributions/4080491/attachments/2142682/3610847/lg_fccee_workshop2020_flvtagging.pdf It's based on this paper: https://journals.aps.org/prd/pdf/10.1103/PhysRevD.101.056019

We have also touched upon the US-Japan collaboration. A few additional point wrt what Jan already sent via email: deadline for proposal Dec15, approval normally does not arrive until August and the potential funds are available for a year, in this case until ~ Aug 2022 - It does not seem impossible to plan a small workshop on strange tagging for instance

Next meeting: Dec. 15th 2020 4pm Pacific

 

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