• Open Access

Determination of the Pole Position of the Lightest Hybrid Meson Candidate

A. Rodas, A. Pilloni, M. Albaladejo, C. Fernández-Ramírez, A. Jackura, V. Mathieu, M. Mikhasenko, J. Nys, V. Pauk, B. Ketzer, and A. P. Szczepaniak (Joint Physics Analysis Center)
Phys. Rev. Lett. 122, 042002 – Published 29 January 2019
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Abstract

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 ηπ. 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±102MeV, 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 a2(1700).

  • Figure
  • Figure
  • Received 13 October 2018
  • Revised 19 November 2018

DOI:https://doi.org/10.1103/PhysRevLett.122.042002

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

  1. Physical Systems
Particles & Fields

Authors & Affiliations

A. Rodas1,*, A. Pilloni2,3,†, M. Albaladejo2,4, C. Fernández-Ramírez5, A. Jackura6,7, V. Mathieu2, M. Mikhasenko8, J. Nys9, V. Pauk10, B. Ketzer8, and A. P. Szczepaniak2,6,7 (Joint Physics Analysis Center)

  • 1Departamento de Física Teórica, Universidad Complutense de Madrid, E-28040 Madrid, Spain
  • 2Theory Center, Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA
  • 3European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*) and Fondazione Bruno Kessler, I-38123 Villazzano (TN), Italy
  • 4Departamento de Física, Universidad de Murcia, E-30071 Murcia, Spain
  • 5Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Ciudad de México 04510, Mexico
  • 6Center for Exploration of Energy and Matter, Indiana University, Bloomington, IN 47403, USA
  • 7Physics Department, Indiana University, Bloomington, IN 47405, USA
  • 8Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, 53115 Bonn, Germany
  • 9Department of Physics and Astronomy, Ghent University, Ghent 9000, Belgium
  • 10Institut für Kernphysik & PRISMA Cluster of Excellence, Johannes Gutenberg Universität, D-55099 Mainz, Germany

  • *arodas@ucm.es
  • pillaus@jlab.org

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Issue

Vol. 122, Iss. 4 — 1 February 2019

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