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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Helicity selection rules and noninterference for BSM amplitudes

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Azatov, Aleksandr ; Contino, Roberto ; Machado, Camila S. ; Riva, Francesco
Total Authors: 4
Document type: Journal article
Source: Physical Review D; v. 95, n. 6 MAR 20 2017.
Web of Science Citations: 37

Precision studies of scattering processes at colliders provide powerful indirect constraints on new physics. We study the helicity structure of scattering amplitudes in the standard model (SM) and in the context of an effective Lagrangian description of beyond-the-SM (BSM) dynamics. Our analysis reveals a novel set of helicity selection rules according to which, in the majority of 2 -> 2 scattering processes at high energy, the SM and the leading BSM effects do not interfere. In such situations, the naive expectation that dimension-6 operators represent the leading BSM contribution is compromised, as corrections fromdimension-8 operators can become equally (if not more) important well within the validity of the effective field theory approach. (AU)

FAPESP's process: 12/21627-9 - The leptonic sector in Quiver Gauge Theories: theory and phenomenology
Grantee:Camila Sampaio Machado
Support type: Scholarships in Brazil - Doctorate