Shengdu Chai

Shengdu Chai

PhD student

Fudan University

Biography

Hi πŸ‘‹ Shengdu Chai here.

Download my resumΓ© .

Interests
  • CMT
  • AI
  • AI4SCI
Education
  • BSc in Physics, 2024

    Fudan University

  • PhD in Physics, 2028

    Fudan University

Recent Publications

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(2024). Measurement of the Chern number for non-Hermitian Chern insulators. PRB.

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Research Experience

 
 
 
 
 
Explanation of New CDF W Mass
Jul 2022 – Sep 2022 University of Chicago
  • Explained both the new W boson mass $m_W^{\rm CDF-II}$ reported by Fermi Lab and the long existed discrepancy of forward-backward asymmetry $A_{FB}^{0,b}$ by introducing new vector-like quarks
  • Explored the model properties by performing a global electroweak fit. Found that the model is consistent with the current direct-search limits at the LHC, the HL-LHC, can cover most of the regions of the parameter space preferred by the electroweak fit. Determined that the one-loop contribution to Higgs couplings in this model was also relevant, which is consistent on current measurement and may be excluded on future collider
  • Determined that the mass of the exotic quark (with charge $-4/3$) is required to be below 4 TeV at the 95% confidence level, and the best-fit point corresponded to a mass of around 1.5 TeV
 
 
 
 
 
Probing BSM effects with machine learning
Nov 2021 – Sep 2022 Fudan University
  • Aimed to apply machine learning techniques to the phenomenological analyses of the Standard Model Effective Field Theory (SMEFT), focusing on the measurements at future lepton colliders
  • Performed machine learning methods with simulations of $e^{+}e^{-} \to W^{+} W^{-} $, including some systematic effects to determine the likelihood ratio in terms of the Wilson coefficients of dimension-six operators in this process.
  • Determined that the machine learning method performed better than the traditional methods, such as Optimal Observable, which corrected the large bias of model parameters and gave strong constraints
  • Planned to explore the applications of these methods to other processes, such as top-pair productions, and using the more realistic datasets from colliders

Projects

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A New Look in the Beautiful Mirror from the W-boson Mass Measurement
Explain W-boson mass($m_W^{CDF-II}$) and forward-backward asymmetry of the bottom quark($A_{FB}^{0,b}$) with the Beautiful Mirror model.
A New Look in the Beautiful Mirror from the W-boson Mass Measurement
Probing BSM effects in $e^{+}e^{-} \to W^{+}W^{-}$ with machine learning
Apply machine learning techniques to the phenomenological analyses of the Standard Model Effective Field Theory (SMEFT), with a focus on the measurements at future lepton colliders. A typical process of $e^{+}e^{-} \to W^{+}W^{-}$ was studied.
Probing BSM effects in $e^{+}e^{-} \to W^{+}W^{-}$ with machine learning

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