10–17 Jul 2019
Ghent
Europe/Brussels timezone

Positivity bounds on vector boson scattering

13 Jul 2019, 09:00
15m
Campus Ledeganck - Aud. 2 (Ghent)

Campus Ledeganck - Aud. 2

Ghent

Parallel talk Top and Electroweak Physics Top and Electroweak Physics

Speaker

Prof. Shuang-Yong Zhou (University of Science and Technology of China)

Description

Weak vector boson scattering (VBS) is a sensitive probe of new physics effects in the electroweak symmetry breaking. Currently, experimental results at the LHC are interpreted in the effective field theory approach, where possible deviations from the Standard Model in the quartic-gauge-boson couplings are often described by 18 dimension-8 operators. By assuming that a UV completion exists, we derive a new set of theoretical constraints on the coefficients of these operators, i.e. certain combinations of coefficients must be positive. These constraints imply that the current effective approach to VBS has a large redundancy: only about 2% of the full parameter space leads to a UV completion. By excluding the remaining unphysical region of the parameter space, these constraints provide guidance for future VBS studies and measurements.

Primary authors

Prof. Cen Zhang (Institute of High Energy Physics, CAS) Prof. Shuang-Yong Zhou (University of Science and Technology of China)

Presentation materials