https://zoom.us/j/96242473756?pwd=1wdUKF9Kq8eyGQtosTNyhNnHh6JYHZ.1
Password 会议密码: 625887
Abstract:
The Large Electron–Positron Collider (LEP) at CERN, which operated from 1989 to 2000, remains the largest e⁺e⁻ collider ever built. Its four experiments—ALEPH, DELPHI, L3, and OPAL—produced a valuable dataset covering center-of-mass energies from 91 GeV to 205 GeV.
Today, all LEP datasets have been preserved on EOS, and the DELPHI experiment has fully released its data, documentation, and completed software stack through CERN Open Data and CVMFS. Community-developed C++ tools are also available, enabling the conversion of legacy DELPHI formats into modern ROOT files.
This presentation provides an overview of the current LEP data-release landscape, introduces the DELPHI open datasets and analysis environment, outlines the structure and content of the released data, and demonstrates how they can be accessed and processed on modern computing systems.
The LEP open datasets hold particular value during the research and development phase of the CEPC and other future e⁺e⁻ colliders. By re-examining LEP data with modern theoretical and computational techniques, we can extract new physics insights and gain practical experience for future collider experiments.
This presentation aims to initiate open discussions and collaborations toward the full scientific utilization of the preserved LEP data.
About the speaker:
Yuzhi Che is a postdoctoral researcher at China Center of Advanced Science and Technology. He obtained his Ph.D. from Institute of High Energy Physics, Chinese Academy of Sciences. His doctoral work focused on developing reconstruction algorithms for high-granularity 5D calorimeters at CEPC. He participated in the work of data format conversion, calibration, and analysis during the beam tests of the CEPC ScECAL and AHCAL prototypes. His current research centers on the determination of the strong coupling constant (αₛ) through tau lepton and B/D-meson decays, including phenomenological studies and experimental study at the CEPC. He is presently working on determining αₛ using tau decay data from BESIII. In addition, he is exploring opportunities for QCD study using the open data released by the LEP experiments.