Constraining SMEFT operators through high invariant-mass Drell–Yan data

by Dr Yingsheng Huang (黄应生) (University of Utah)

Monday 16 Jun 2025, 10:00 → 11:00 Asia/Shanghai

5#/6th-603 - Meeting Room 603 (Science Building)

Abstract:

High invariant-mass Drell–Yan process offers a unique probe of the four-fermion sector in the Standard Model Effective Field Theory (SMEFT). In this talk, I will present a series of studies that explore how dimension-6 and dimension-8 four-fermion operators can be constrained using Drell–Yan measurements at the LHC. I begin by showing that the transverse momentum distribution of dilepton pairs at high energy is sensitive to specific dimension-8 operators and can discriminate between different operator structures and potential UV completions. I then discuss how forward-backward asymmetry measurements help break flat directions in the four-fermion sector, improving sensitivity at both 1/Lambda^2 and 1/Lambda^4 orders. Finally, I present new results on the renormalization group evolution of dimension-8 four-fermion operators, emphasizing where running effects become significant across energy scales. Together, these developments demonstrate how Drell–Yan observables can extend SMEFT analyses beyond the leading dimension-6 level and sharpen our understanding of possible new physics.

Biography:

2016-2021, PhD at IHEP, CAS; 
2021-2024, Postdoc at Northwestern University & Argonne National Lab; 
2024-2025, Postdoc at University of Utah

Alternative online link：https://meeting.tencent.com/dm/bAlthltLNwYq

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