RT Journal Article
T1 Determination of the pole position of the lightest hybrid meson candidate
A1 Rodas Bilbao, Arkaitz
A1 Pilloni, A.
A1 Albaladejo, M.
A1 Fernández Ramírez, César
A1 Jackura, A.
A1 Mathieu, Vincent
A1 Mikhasenko, M.
A1 Nys, J.
A1 Pauk, V.
A1 Ketzer, B.
A1 Szczepaniak, A. P.
AB 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, pi¬_1(1400) and pi_1 (1600), which couple separately to eta pi and eta'pi. 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 eta^(')pi 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 pi_1 resonant pole, with mass and width 1564 +/- 24 +/- 86 and 492 +/- 54 +/- 102 MeV, which couples to both eta^(')pi channels. We find no evidence for a second exotic state. We also provide the resonance parameters of the a_2 (1320) and a_2^' (1700).
PB American physical society
SN 0031-9007
YR 2019
FD 2019-01-29
LK https://hdl.handle.net/20.500.14352/13151
UL https://hdl.handle.net/20.500.14352/13151
LA eng
NO ©2019 American Physical SocietyWe would like to thank the COMPASS Collaboration for useful comments. A. P. thanks the Mainz Institute for Theoretical Physics (MITP) for its kind hospitality while this work was being completed. This work was supported by the U.S. Department of Energy under Grants No. DE-AC05-06OR23177 and No. DE-FG02-87ER40365, U.S. National Science Foundation under Grant No. PHY-1415459, Ministerio de Ciencia, Innovacion y Universidades (Spain) Grants No. FPA2016-75654-C2-2-P and No. FPA2016-77313-P, Universidad Complutense de Madrid predoctoral scholarship program, Research Foundation-Flanders (FWO), PAPIIT-DGAPA (UNAM, Mexico) under Grants No. IA101717 and No. IA101819, CONACYT (Mexico) under Grant No. 251817, the German Bundesministerium fur Bildung und Forschung (BMBF), and Deutsche Forschungsgemeinschaft (DFG) through the Collaborative Research Center [The Low-Energy Frontier of the Standard Model (SFB 1044)] and the Cluster of Excellence [Precision Physics, Fundamental Interactions and Structure of Matter (PRISMA)].
NO Ministerio de Ciencia e Innovación (MICINN)
NO Universidad Complutense de Madrid predoctoral scholarship program
NO German Bundesministerium fur Bildung und Forschung (BMBF)
NO Deutsche Forschungsgemeinschaft (DFG)
NO Collaborative Research Center [The Low-Energy Frontier of the Standard Model]
NO Cluster of Excellence [Precision Physics, Fundamental Interactions and Structure of Matter (PRISMA)]
DS Docta Complutense
RD 6 abr 2025