Kun Liu weekly discussion with students [ATLAS]

Wednesday 16 Nov 2022, 16:00 → 17:05 Asia/Shanghai

Online

1 Introduction

General items.

Speaker: Prof. Kun LIU (Tsung-Dao Lee Institute & Shanghai Jiao Tong University)

2 ttWML and ttHML analyses status

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

ttWML analysis status:

• The group decided to fall back to the sub-optimal MG FxFx sample for ttW Gen and target a conf-conversion for the LHCTop/HWG meeting in December: https://indico.cern.ch/event/1219500/
• Unblinded fits are being rolled out for different setups (inclusive, differential,..). No showstoppers flagged so far. Latest inclusive results can be found here: https://indico.cern.ch/event/1221489/#2-inclusive-fit-updates (quite consistent with CMS within uncertainties)
• After conf-conversion, we will proceed to a paper targeting Moriond.

ttHML analysis status:

• Most of the efforts focussed on defining MVA discriminants to be used in the SRs
• Working with Jialin to come up with a good discriminant using DNN. Multiple configurations tested so far. Main bottleneck is the ttW CR and ttH SR definitions. Large anti-correlation (70%) observed between NF(ttH) and NF(ttW) which is not desirable.
• First dedicated (mini/skimmed) ttHML ntuples production now mostly ready (few jobs to be retried). Issues encountered when downloading the samples to eos and are being followed-up.

3 ttH analysis

Speaker: jialin li

4 photon ID efficiency measurement & Zgamma analysis

Speaker: Kang Liu

For Photon ID in Rel21

I have get ID efficiency of data17 and mc16d, but the result is not correct due to the smirnov transformation.

Now I reruning the grid job to build mc16d ntuples. it near to finish (95%).

After that I will recalculate the smirnov transformation, and then apply it on data17 and calculate ID efficiency.

For Photon ID in Rel22

Since the type of branch is vector<double>, what I need is only one of the vector. So I am learning the code of fill histogram in TnP.

Also I am trying to extract, for example, pt__NOSYS[0] in the Create finely-binned histograms code.

For CV Test

Due to the low resistance of the open circuit calibration of the LCR meter. For example, it should be in the order of G ohms normally, but after calibration, it is displayed in the order of M ohms.

After investigation, it is found that the capacitor of the adapter is short-circuited.

I have already purchased capacitors with the same specifications and asked Tang Jiannan to help me solder it. 

We can restart CV test this Thursday.

5 silicon tracker: HGTD

6 Non-academic items

Anything else?