The one-loop on-shell renormalization of some vertexes in MSSM

TL;DR

This paper develops an on-shell renormalization scheme for specific vertices in the MSSM, incorporating one-loop virtual SUSY particles, and compares zero-momentum and on-shell schemes for consistency and decoupling.

Contribution

It introduces a consistent on-shell renormalization approach for MSSM vertices at one-loop, addressing previous gaps in the scheme's development.

Findings

The sum of triangle diagram amplitudes can be renormalized collectively.

Zero-momentum and on-shell schemes yield decoupled results.

The scheme ensures internal virtual particles are consistent.

Abstract

The on-shell renormalization scheme for the electroweak theory is well studied in the standard model(SM), but a consistent on-shell renormalization scheme for the minimal supersymmetric standard model(MSSM) is still unknown. In MSSM, we study the on-shell scheme for three vertexes$Z\bar{l^I}l^I, W^+\bar{\nu^I}l^I $ and $\tilde{L}^*_i\bar{\chi^0_{\alpha}}l^I$ with virtual SUSY particles (chargino, sneutrino, neutralino and slepton) at one-loop order. Instead of amplitude of a single triangle diagram, the sum of amplitude of triangle diagrams belonging to one suit can be renormalized in the on-shell scheme. One suit points out that the internal virtual particles are consistent. Zero-momentum scheme is also used for the renormalization. The two schemes can make the renormalized results decoupled. In MSSM, some special characters of the on-shell scheme are shown here. This work is propitious to complete the on-shell renormalization scheme in MSSM.