267 citations · 3.2k across the 56 of their papers we have counts for
7 papers · 1 filter
Generalized elastic positivity bounds on interacting massive spin-2 theories
Zi-Yue Wang, Cen Zhang, Shuang-Yong Zhou
We use generalized elastic positivity bounds to constrain the parameter space of multi-field spin-2 effective field theories. These generalized bounds involve inelastic scattering…
Unambiguously Testing Positivity at Lepton Colliders
Jiayin Gu, Lian-Tao Wang, Cen Zhang
The diphoton channel at lepton colliders, , has a remarkable feature that the leading new physics contribution comes only from dimension-eight operators. Th…
Elastic positivity vs extremal positivity bounds in SMEFT: a case study in transversal electroweak gauge-boson scatterings
Kimiko Yamashita, Cen Zhang, Shuang-Yong Zhou
The positivity bounds, derived from the axiomatic principles of quantum field theory (QFT), constrain the signs of Wilson coefficients and their linear combinations in the Standard…
Positivity in electron-positron scattering: testing the axiomatic quantum field theory principles and probing the existence of UV states
Benjamin Fuks, Yiming Liu, Cen Zhang +1
We consider the positivity bounds on dimension-8 four-electron operators and study two related phenomenological aspects at future lepton colliders. First, if positivity is violated…
Automated one-loop computations in the SMEFT
Céline Degrande, Gauthier Durieux, Fabio Maltoni +3
We present the automation of one-loop computations in the standard-model effective field theory at dimension six. Our general implementation, dubbed SMEFT@NLO, covers all types of…
Convex Geometry Perspective to the (Standard Model) Effective Field Theory Space
Cen Zhang, Shuang-Yong Zhou
We present a convex geometry perspective to the Effective Field Theory (EFT) parameter space. We show that the second derivatives of the forward EFT amplitudes form a convex co…
Generalized positivity bounds on chiral perturbation theory
Yu-Jia Wang, Feng-Kun Guo, Cen Zhang +1
Recently, a new set of positivity bounds with derivatives have been discovered. We explore the generic features of these generalized positivity bounds with loop amplitudes and…