Heavy Flavour working meeting

Friday 29 Jan 2021, 14:00 → 16:05 Europe/Zurich

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Minutes of Top/HF Meeting 29/1/21

Attendees: F. Zarnecki, A. Irles, Y. Okugawa, F. Simon, H. Yamamoto, J.P.  Marquez-Hernandes

• Seidai (no presentatin since preparation of Master Thesis): ILD Note in progress, presentation at sw/ana Meeting and at LCWS
• Roman: Deficits in ee->tt in continuum 
• Tilt in angular spectrum for vtx-vtx method, low energetic b?
  • Requires revision of vertex recovery and development of calibration methods
• Drop in acceptance in polar angle spectrum of KK method (see also next talks)
• Can one produce samples w/o single-top background?
• Question is how to present observations to "outside world" at e.g. LCWS?
• Yuichi: Kaon reconstruction in ee->bb
  • Slide 5: Many entries in # of Kaons = 0?
  • Serious drop in polar angle spectrum (efficiency) when using dE/dx as stored in DST. "Traditional" method was to accept/reject generated Kaon based on study with reconstructed files (cheating or at least semi-cheating)
  • Adrian and Yuichi will check efficiency with newer samples 
  • Suggest to show always dE/dx vs. costheta along with dE/dx vs. p   
• Adrian: DQ checks with new samples 
  • K/p separation looks reasonable after bug fix in McTruth link.
  • However, still puzzling results when using reconstructed particle (all fine for tracks), bug or feature?
  • No (bad) surprises in DQ checks
  • May want to exclude lowest energetic photons from ISR plots
  • DQ checks are candidate for talk in one of the upcoming ILD sw/ana meetings
• Frank/Filip:
• Possibility of new studies at threshold or concerning mass are about to be exhausted
• Potential candidates are ...
  • ... analysis of reconstructed events at different energies at threshold
  • ... experimental study of ee->tt\gamma 
  • It is rather time to wrap-up the current knowledge
• Potential LCWS contributions
  • tt continuum, open experimental issues (R.P., to be seen whether it can be properly presented)
  • Update on ee->bb paper (Adrian)
  • top mass by Kacper
  • Kaon reconstruction by Yuichi and Adrian
  • Nature of several talks may call for combined sessions

14:00 → 14:05 News

Speaker: Roman Poeschl (Centre National de la Recherche Scientifique (FR))

14:05 → 14:25 ttbar analysis in the continuum - Open issues

Summary of results by Yuichi and what to do (and by whom?)

Speaker: Roman Poeschl (Centre National de la Recherche Scientifique (FR))

talk290121.pdf

14:25 → 14:45 Towards ee->ss, Kaons in ee->bb sample

Speaker: Yuichi Okugawa (Tohoku University)

HF_meeting_01_29_21.pdf

14:45 → 15:05 Discussion on ILD ee->qq samples

Speaker: Adrian Irles (IFIC UV/CSIC)

20210129.pdf

15:05 → 15:25 Discussion - Contributions to LCWS