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Bottom-up approach within the electroweak effective theory : constraining heavy resonances


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Title: Bottom-up approach within the electroweak effective theory : constraining heavy resonances
Authors : Pich Zardoya, Antonio
Rosell Escribá, Ignasi
Sanz Cillero, Juan José
Keywords: Particles (Nuclear physics)Colisiones (Física nuclear)Materia - Propiedades.Collisions (Nuclear physics)Partículas (Física nuclear)Matter - Properties.
Publisher: American Physical Society.
Citation: Pich, A., Rosell, I. and Sanz-Cillero, J.J. (2020). Bottom-up approach within the electroweak effective theory : constraining heavy resonances. Physical Review D, vol. 102, n. 3, art. 035012 (10 aug.). DOI: https://doi.org/10.1103/PhysRevD.102.035012
Abstract: The LHC has confirmed the existence of a mass gap between the known particles and possible new states. Effective field theory is then the appropriate tool to search for low-energy signals of physics beyond the Standard Model. We adopt the general formalism of the electroweak effective theory, with a nonlinear realization of the electroweak symmetry breaking, where the Higgs is a singlet with independent couplings. At higher energies we consider a generic resonance Lagrangian which follows the above-mentioned nonlinear realization and couples the light particles to bosonic heavy resonances with JP ¼ 0 and JP ¼ 1 . Integrating out the resonances and assuming a proper short-distance behavior, it is possible to determine or to constrain most of the bosonic low-energy constants in terms of resonance masses. Therefore, the current experimental bounds on these bosonic low-energy constants allow us to constrain the resonance masses above the TeV scale, by following a typical bottom-up approach, i.e., the fit of the low-energy constants to precise experimental data enables us to learn about the high-energy scales, the underlying theory behind the Standard Model.
Description: Este artículo se encuentra disponible en la siguiente URL: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.102.035012
URI: http://hdl.handle.net/10637/12733
Rights : http://creativecommons.org/licenses/by/4.0/deed.es
ISSN: 2470-0010.
2470-0029 (Electrónico).
Issue Date: 10-Aug-2020
Center : Universidad Cardenal Herrera-CEU
Appears in Collections:Dpto. Matemáticas, Física y Ciencias Tecnológicas





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