DESY Top-γ meeting

Wednesday 9 Oct 2024, 10:00 → 11:00 Europe/Berlin

Meeting on the top + γ/VBF analyses

Zoom link: https://cern.zoom.us/j/61166484954?pwd=RGlyOHFYcXFDYmNVMm5GQkhTclc1Zz09

Zoom Meeting ID: 611 6648 4954   

passcode: 668374  

indico agenda password: cdesy

 

10:00 → 10:20 Round table

Speakers: Hugo Alberto Becerril Gonzalez (CMS (CMS Fachgruppe TOP)), Ms Ying An (CMS (CMS Fachgruppe TOP))

• The top reconstruction efficiency. If it’s low, need special MET smearing
• Whether a gap in the y-axis is needed in the ABCD method. The gap is for reducing the contribution of prompt photons in regions near A (SR).

Just check the prompt photon distribution in C in chiso and sigma ieta ieta.

• Check how large the kMC shape correction factor
• More bins for ttgamma when do differential fit?
• Regarding improvement in precision for ttgamma (Barbara's comment):  impact plots before and after

It's mainly because the contribution of photons from decay from ttbat+jets is really large. Previously we considered it as background, and now it's merged into the ttgamma of photons from the production. So we not only enlarge the total signal contribution but also decrease the background contribution, then sensitivity thus increased.