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High Energy


QMAP Particles/Cosmology Seminar: Da Liu

Description Speaker: Da Liu
Title: Gauge Invariance From On-Shell Massive Amplitude and Tree Unitarity
Room: 3024

In this talk, I will discuss about my soon-appearing work about the on-shell understanding of the spontaneously broken gauge theories by employing the on-shell massive spinor formalism and tree unitarity. We start from the most general on-shell three-particle amplitudes with hard energy growing behavior at most of O(E) involving arbitrary, finite number of massive scalars, spinors and vectors. Then the factorizable parts of the four-particle amplitudes are calculated by gluing the on-shell three-particle amplitudes together and utilizing the fact that tree-level amplitudes have only simple poles. The contact parts of the four-particle amplitudes are further determined by tree unitarity, which also puts strong constraints on the possible allowed three-particle coupling constants and the masses. The derived relations among them converge to the predictions of gauge invariance in the UV theory, which is consistent with the classic results by Cornwall, Levin and Tiktopoulos.
Date Mon, April 25, 2022
Time 1:30pm-3:00pm PDT
Duration 1 hour 30 minutes
Access Public
Created by High-Energy Seminars
Updated Thu, April 21, 2022 3:01pm PDT

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