S, T, U Parameters in The B-LSSM

2025/01/02 by Cui, Sheng-Kai, Sun, Ke-Sheng, Yan, Yu-Li +2 · 1 citation
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2501.01060

Abstract

Using the pinch technique, we compute the one-loop vertices of weak interactions in the B-LSSM and incorporate their pinch contributions into the gauge boson self-energies. Compared to the definitions of the S, T, and U parameters in the Standard Model based on the SU(2)_L⊗ U(1)_Y group, the corresponding parameters in the B-LSSM are modified. We provide these redefined S, T, and U parameters and demonstrate the convergence of the results. In the framework of the low-energy effective Lagrangian for weak interactions, the S, T, and U parameters can be expressed as functions of certain parameters in the B-LSSM. The updated experimental and fitting results constrain the parameter space of the B-LSSM strongly.

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