Kun Liu weekly discussion with students [ATLAS]

Wednesday 11 Jan 2023, 16:00 → 17:30 Asia/Shanghai

Online

1 ttWML and ttHML analyses status

Speaker: Nihal BRAHIMI (Tsung-Dao Lee Institute & Shanghai Jiao Tong University)

ttWML analysis status:

• Latest version of unblinded results (inclusive and differential cross-sections) are being prepared implementing latest luminosity recommendations and comments received after unblinding.
• The team is now targeting to have the closure of the analysis on Jan 19th at the Top plenary. We will have a clearer picture of whether this target in still in the cards for us by the end of this week.

ttHML analysis status:

• First dedicated (mini/skimmed) ttHML ntuples production now ready (few jobs to be retried). Main bottleneck for validating the samples conveniently was the limited eos space (HSG8 eos full) however the space was cleaned before the break and the whole production was moved there. Studies based on the new production are already underway.
• Working with Jialin to come up with a good discriminant using DNN. Multiple configurations tested but all seem to underperform compared to 3D DNN implemented by SDU group. We have decided to join forces and focus on the 3D DNN setup from now onwards.
• It is crucial to set an S/B blinding threshold to start checking the quality of MC modeling especially for the DNN input training variables and obtained MVA scores. Jialin has started checking the S/B in different regions to help inform the decision on the threshold.

2 ttH analysis

Speaker: jialin li

20230111_ttH.pdf

3 photon ID efficiency measurement & Zgamma analysis

Speaker: Kang Liu

I am working on create finely-binned histograms for calculate Smirnov transformations in Rel22. There is some trouble in applying cut, which I am trying to solve.

4 Zgamma combination

Speaker: yufeng wang

IHEP publication about AC-LGAD simulation: https://iopscience.iop.org/article/10.1088/1748-0221/17/09/C09014

(no hardware test publication)

silicon width:  EPI-50um，Low resisitence: 725um

5 silicon tracker: HGTD

6 Non-academic items

Anything else?