Kun's weekly group discussion

Wednesday 29 Nov 2023, 13:30 → 15:00 Asia/Shanghai

Tsung-Dao Lee Institute/N5F-N530 - Discussion Room (Tsung-Dao Lee Institute)

DarkSHINE tracker, analysis and simulation

1 Tracking detector R&D

Speaker: Kang Liu

2 Tracking reconstruction

Speaker: Junhua Zhang

20231129-Junhua.pdf

3 Simulation and analysis

Speaker: Yufeng Wang (TDLI)

Baseline 1.6 validation:

• Sample production done with signal, GMM_Target, GMM_ECAL, PN_ECAL samples. The rest rare bkg. samples reconstruction are pending.
• Seen significant signal efficiency drop (~60% -> ~30%) at high dark photon mass.
  • mainly due to track reconstruction failure, investigating.
  • also seen difference between truth/reconstructed momentum.
• background extrapolation:
  • need filter efficiency (ECAL energy < 4 GeV, missing momentum > 2 GeV) for scaling, but trends are already there.
  • seen different relative cut efficiency in baseline 1.6 comparing to baseline 1.0, to be investigated with (1) track reconstructed fixed (2) filter efficiency applied.

ATLAS performance and physics

4 ttW/ttH -> multi-leptons analysis

Speaker: Jialin Li

5 Electron/photon performance, H->Zgamma and gg* analysis

Speakers: Danning Liu (TDLI/SJTU), Kang Liu, Rui Yuan (SJTU)

Kang:

H2Zy framework:
for MC sample: 

I tried to change the MC DAOD with different p-tag as input, but I encountered different error messages.
'you should use p-tags >= p5834. OR set ExcludeNSWFromPrecisionLayers to True before crashing if you want to technically be able to run on old DAODs, noting that this is allowed only for testing purposes' or
'Failed to find PHYSKernel CutBookkeeper in MetaData! Exiting.Package.EventLoopComp_...ERROR' 

for data18 sample: 

This can be run completely, but there seems to be some problems with the output.'

 

Danning and Rui : 

Use JobOption files in new release to generate 100k events (enough statistics) for validation test 

Developing analysis code for extracting histograms and ntuples 

perform validation between Run3 MC @ 13.6 TeV and Run2 MC @ 13 TeV ( normallize to same cross-section and same luminosity )

6 Round table

Speakers: Mr DIAN YU (Tsung-Dao Lee Institute), Lin Yang (TDLI), Zhiyang Dai

Electroweak Phase Transition Analysis Works

https://arxiv.org/abs/2303.03612

Physical Motivations: Matter-Antimatter Asymmetry

-Why is it a problem?-

In general: 

The symmetry between particles and antiparticles firmly established in collider physics, while the observed universe composed almost entirely of matter.

Direct evidence of matter-antimatter asymmetry:

1. Proton-Antiproton number ratio in cosmic rays (p + p --> 3p + pbar); https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.61.145
2. No observations of annihilation backgrounds within clusters; https://www.annualreviews.org/doi/10.1146/annurev.aa.14.090176.002011
3. No observations of matter-antimatter annihilations on the level of LSS (CMB); https://www.annualreviews.org/doi/10.1146/annurev.aa.14.090176.002011