Precise determination of the strong coupling constant from collider data

by Dr Xiaoyue Zhang (Massachusetts Institute of Technology)

Thursday 8 Jan 2026, 11:00 → 12:00 Asia/Shanghai

Tsung-Dao Lee Institute/N6F-N600 - Lecture Room (Tsung-Dao Lee Institute)

Abstract: 

Measuring the QCD strong coupling constant alpha_s from high-energy collider data with precision comparable to the lattice calculation has been a longstanding challenge. At electron–positron colliders, extractions from event-shape observables such as thrust and heavy-jet mass show persistent discrepancies, potentially arising from physics in the multi-jet region. At hadron colliders, energy correlators have recently demonstrated excellent performance for alpha_s determination, exhibiting good perturbative convergence and suppressed non-perturbative corrections. In this talk, I will present theoretical advances in the calculation of these QCD observables using soft-collinear effective theory, discuss the treatment of theoretical uncertainties, and provide updated alpha_s extractions based on these developments.

Short bio:

Xiaoyue Zhang is a Pappalardo postdoctoral fellow at Massachusetts Institute of Technology. He received his Bachelor's degree from Zhejiang University in 2020 and his Ph.D. from Harvard University in 2025. His research focuses on precision measurements of quantum chromodynamics at colliders using effective field theories and fixed-order calculation techniques.
 

Alternative online link：https://meeting.tencent.com/dm/52sJC41iURsh

ID: 986251261