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Abstract:
The null results of the direct production of new physics (NP) particles from collider experiments revive the spirit of effective field theory as a tool towards NP signal. In this talk, I will review several pieces of work I touched upon in the past few years concerning the SMEFT at dimension seven (dim 7), including the construction of operator basis, its 1-loop renormalization, and the analysis of key low energy physical processes. I will first demonstrate how to use the traditional techniques to obtain a minimal operator basis by reducing the redundant operators, then I will discuss the full 1-loop SM renormalization of dim-7 SMEFT operators and analyze the interesting structures of the anomalous dimension matrix. For the last purpose, I will take the lepton number violating kaon decay as a typical example to show how to systematically investigate low energy observables in the EFT framework. This process can probe LNV signals beyond the first generation particles. In doing so, I will introduce the low energy effective field theory (LEFT) and chiral perturbation theory ( PT) as intermediate tools to tackle this multi-scale problem.
Biography：
Dr. Xiao-Dong Ma attained the PhD degree from Nankai University in 2019. Then he moved to National Taiwan University as a Postdoc. He will join the TDLI as a postdoc soon. His research mainly focuses on the effective field theory and new physics signatures beyond the standard model.