Categoria: General Positivity Constraints and Their Applications in SMEFT - Dr. Xu Li

Positivity Constraints and Their Applications in SMEFT - Dr. Xu Li


Marzo 19, 2025

Seminario di Fisica Teorica
Positivity bounds impose constraints on the dimension-8 SMEFT parameter space as a direct consequence of fundamental QFT principles. In this talk, I will first review the general aspects of the Standard Model EFT framework, covering the matching and mixing of higher-dimensional operators, as well as global fits and the inverse problem—inferring UV information. I will then introduce the methodology of positivity bounds, highlighting their role as a complementary tool not only for constraining parameter space but also for restricting the RGE running behavior of dimension-8 operators. Finally, I will discuss the potential power of positivity in addressing the inverse <a href="http://problem.

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