Constructing on-shell operator basis for all masses and spins

by Dr Teng Ma (Technion)

Tuesday 17 May 2022, 16:00 → 17:30 Asia/Seoul

Online (zoom) (KIAS)

Title:  Constructing on-shell operator basis for all masses and spins  

Speaker: Teng Ma (Technion)

Abstract: 

In this talk, I will introduce the background of on-shell theory.

Then I will introduce our theory that can fully solve the long-standing problem of operator basis construction for fields with any masses and spins. Based on the on-shell method, we propose a novel method to systematically construct a complete set of lowest dimensional  amplitude bases at any given dimension through semi-standard Young tableaus of Lorentz subgroup SU(2)r and global symmetry U(N) (N is the number of external legs), which can be directly mapped into physical operator bases. We first construct a complete set of monomial bases whose dimension is not the lowest and a redundant set of bases that always contains a complete set of amplitude bases with the lowest dimension. Then we decompose the bases of the redundant set into the monomial bases from low to high dimension and eliminate the linear correlation bases. Finally, the bases with the lowest dimension can be picked up. We also propose a matrix projection method to construct the massive amplitude bases involving identical particles. The operator bases of a generic massive effective field theory can be efficiently constructed by the computer programs. A complete set of four-vector operators at dimensions up to six is presented.

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