Publicación: Determination of the Pole Position of the Lightest Hybrid Meson Candidate
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Fecha
2019-01-29
Autores
Rodas, A.
Albadalejo, M.
Jackura, A.
Mathieu, V.
Mikhasenko, M.
Nys, J.
Pauk, V.
Ketzer, B.
Szczepaniak, A. P.
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info:eu-repo/semantics/openAccess
Licencia Creative Commons
http://creativecommons.org/licenses/by/4.0/deed.es
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Editor
American Physical Society
Resumen
Mapping states with explicit gluonic degrees of freedom in the light sector is a challenge, and has led to controversies in the past. In particular, the experiments have reported two different hybrid candidates with spin-exotic signature, 𝜋1(1400) and 𝜋1(1600), which couple separately to 𝜂𝜋 and 𝜂′𝜋. This picture is not compatible with recent Lattice QCD estimates for hybrid states, nor with most phenomenological models. We consider the recent partial wave analysis of the 𝜂(′)𝜋 system by the COMPASS Collaboration. We fit the extracted intensities and phases with a coupled-channel amplitude that enforces the unitarity and analyticity of the 𝑆 matrix. We provide a robust extraction of a single exotic 𝜋1 resonant pole, with mass and width 1564 ±24 ±86 and 492 ±54 ±102 MeV, which couples to both 𝜂(′)𝜋 channels. We find no evidence for a second exotic state. We also provide the resonance parameters of the 𝑎2(1320) and 𝑎′
2(1700).
Descripción
The registered version of this article, first published in “Physical Review Letters, 122(4)2002", is available online at the publisher's website:
American Physical Society, https://doi.org/10.1103/PhysRevLett.122.042002
La versión registrada de este artículo, publicado por primera vez en “Physical Review Letters, 122(4)2002", está disponible en línea en el sitio web del editor: American Physical Society, https://doi.org/10.1103/PhysRevLett.122.042002
La versión registrada de este artículo, publicado por primera vez en “Physical Review Letters, 122(4)2002", está disponible en línea en el sitio web del editor: American Physical Society, https://doi.org/10.1103/PhysRevLett.122.042002
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Citación
Rodas, Pilloni, Albaladejo, Fernández-Ramírez, Jackura, Mathieu, Mikhasenko, Nys, Pauk, Ketzer, & Szczepaniak. (2019). Determination of the Pole Position of the Lightest Hybrid Meson Candidate. Physical Review Letters, 122(4)2002. https://doi.org/10.1103/PHYSREVLETT.122.042002
Centro
Facultad de Ciencias
Departamento
Física Interdisciplinar