Determination of the Pole Position of the Lightest Hybrid Meson Candidate

Rodas, A.; Pilloni, A.; Albaladejo, M.; Fernández-Ramírez, C.; Jackura, A.; Mathieu, V.; Mikhasenko, M.; Nys, J.; Pauk, V.; Ketzer, B.; Szczepaniak, A. P.

doi:10.1103/PhysRevLett.122.042002

Title: Determination of the Pole Position of the Lightest Hybrid Meson Candidate

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 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).

Authors:: Rodas, A.; Pilloni, A.; Albaladejo, M.; Fernández-Ramírez, C.; Jackura, A.; Mathieu, V.; Mikhasenko, M.; Nys, J.; Pauk, V.; Ketzer, B.; Szczepaniak, A. P.; Joint Physics Analysis Center

Publication Date:: Tue Jan 29 00:00:00 EST 2019

Research Org.:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Org.:: USDOE

Contributing Org.:: Joint Physics Analysis Center

OSTI Identifier:: 1492755

Alternate Identifier(s):: OSTI ID: 1493164

Report Number(s):: JLAB-THY-18-2839; DOE/OR/-23177-4566; arXiv:1810.04171
Journal ID: ISSN 0031-9007; PRLTAO; 042002

Grant/Contract Number:: AC05-06OR23177; FG02-87ER40365; PHY-1415459; FPA2016-75654-C2-2-P; FPA2016-77313-P; IA101717; IA101819; 251817

Resource Type:: Published Article

Journal Name:: Physical Review Letters

Additional Journal Information:: Journal Name: Physical Review Letters Journal Volume: 122 Journal Issue: 4; Journal ID: ISSN 0031-9007

Publisher:: American Physical Society

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats


                    Rodas, A., Pilloni, A., Albaladejo, M., Fernández-Ramírez, C., Jackura, A., Mathieu, V., Mikhasenko, M., Nys, J., Pauk, V., Ketzer, B., Szczepaniak, A. P., and Joint Physics Analysis Center. Determination of the Pole Position of the Lightest Hybrid Meson Candidate.  United States: N. p., 2019. 
Web.  doi:10.1103/PhysRevLett.122.042002.

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                    Rodas, A., Pilloni, A., Albaladejo, M., Fernández-Ramírez, C., Jackura, A., Mathieu, V., Mikhasenko, M., Nys, J., Pauk, V., Ketzer, B., Szczepaniak, A. P., & Joint Physics Analysis Center. Determination of the Pole Position of the Lightest Hybrid Meson Candidate.  United States.  https://doi.org/10.1103/PhysRevLett.122.042002

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                    Rodas, A., Pilloni, A., Albaladejo, M., Fernández-Ramírez, C., Jackura, A., Mathieu, V., Mikhasenko, M., Nys, J., Pauk, V., Ketzer, B., Szczepaniak, A. P., and Joint Physics Analysis Center. Tue .  
"Determination of the Pole Position of the Lightest Hybrid Meson Candidate".  United States.  https://doi.org/10.1103/PhysRevLett.122.042002.

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@article{osti_1492755,

  title        = {Determination of the Pole Position of the Lightest Hybrid Meson Candidate},

  author       = {Rodas, A. and Pilloni, A. and Albaladejo, M. and Fernández-Ramírez, C. and Jackura, A. and Mathieu, V. and Mikhasenko, M. and Nys, J. and Pauk, V. and Ketzer, B. and Szczepaniak, A. P. and Joint Physics Analysis Center},

  abstractNote = {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).},

  doi          = {10.1103/PhysRevLett.122.042002},

  journal      = {Physical Review Letters},

  number       = 4,

  volume       = 122,

  place        = {United States},

  year         = {Tue Jan 29 00:00:00 EST 2019},

  month        = {Tue Jan 29 00:00:00 EST 2019}

}

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Cited by: 51 works

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FIG. 1: Fits to the ηπ (upper line) and η0π (lower line) data from COMPASS. The intensities of the P (left), D wave (center), and their relative phase (right) are shown. The inset zooms into the region of the a'₂(1700). The solid line and green band show the result ofmore »

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TABLE I (p. 4)

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Title: Determination of the Pole Position of the Lightest Hybrid Meson Candidate

Abstract

Citation Formats

Figures / Tables:

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Exotic ηπ state in annihilation at rest into π−π0η pspectator journal, March 1998

Flux-tube model for hadrons in QCD journal, June 1985

The hybrid mesons quest: the MesonEx experiment at Jefferson Laboratory journal, February 2016

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Hybrid mesons conference, October 2012

Construction of Coupled Scattering and Production Amplitudes Satisfying Analyticity and Unitarity journal, May 1960

Model of mesons with constituent gluons journal, February 1978

Multiquark resonances journal, January 2017

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Toward the excited isoscalar meson spectrum from lattice QCD
journal, November 2013

$η π$ and $η^{'} π$ Spectra and Interpretation of Possible Exotic $J^{P C} = 1^{- +}$ Mesons
journal, August 2003

Final state interaction and a light mass “exotic” resonance
journal, January 2002

Study of X(1600) 1−+ hybrid
journal, January 2000

The K-matrix formalism for overlapping resonances
journal, July 1972

The COMPASS setup for physics with hadron beams
journal, April 2015

Review of Particle Physics
journal, August 2018

Minuit - a system for function minimization and analysis of the parameter errors and correlations
journal, December 1975

Exotic mesons in quenched lattice QCD
journal, December 1997

Hybrid mesons from quenched QCD
journal, May 1997

Hybrid mesons
journal, May 2015

Heavy-quark QCD exotica
journal, March 2017

Odd and even partial waves of $η π^{-}$ and $η^{'} π^{-}$ in $π^{-} p \to η^{(')} π^{-} p$ at $191 GeV / c$
journal, January 2015

QG hybrid mesons in the MIT bag model
journal, September 1983

Exotic Meson Decay to $ω π^{0} π^{-}$
journal, January 2005

Observation of Exotic Meson Production in the Reaction $π^{-} p \to η^{'} π^{-} p$ at $18 GeV / c$
journal, April 2001

New analysis of ηπ tensor resonances measured at the COMPASS experiment
journal, April 2018

Principle of Equivalence for all Strongly Interacting Particles within the $S$ -Matrix Framework
journal, November 1961

Kinematical Interpretation of the First $π - p$ Resonance
journal, August 1964

Hadronic molecules
journal, February 2018

Central production of mesons: Exotic states versus Pomeron structure
journal, July 1999

Nonstandard heavy mesons and baryons: Experimental evidence
journal, February 2018

Light isovector resonances in $π^{-} p \to π^{-} π^{-} π^{+} p$ at $190 GeV / c$
journal, November 2018

Evidence for Exotic Meson Production in the Reaction $π^{-} p \to η π^{-} p$ at $18 GeV / c$
journal, September 1997

Diquarks and Exotic Spectroscopy
journal, December 2003

Self-consistent statistical error analysis of $π π$ scattering
journal, April 2015

Coulomb gauge QCD, confinement, and the constituent representation
journal, December 2001

The production and decay of hybrid mesons by flux-tube breaking
journal, June 1995

New experimental evidence for four-quark exotics. the serpukhov Φπ resonance and the GAMS ηπ enhancement
journal, October 1987

Exotic ηπ state in annihilation at rest into π−π0η pspectator
journal, March 1998

Flux-tube model for hadrons in QCD
journal, June 1985

The hybrid mesons quest: the MesonEx experiment at Jefferson Laboratory
journal, February 2016

Observation of a $J^{PC} = 1^{- +}$ Exotic Resonance in Diffractive Dissociation of $190 GeV / c$ $π^{-}$ into $π^{-} π^{-} π^{+}$
journal, June 2010

Hybrid mesons
conference, October 2012

Construction of Coupled Scattering and Production Amplitudes Satisfying Analyticity and Unitarity
journal, May 1960

Model of mesons with constituent gluons
journal, February 1978

Multiquark resonances
journal, January 2017

Deck-model calculation of $π^{-} p \to π^{-} π^{+} π^{-} p$
journal, April 1974

Some tests for the helicity structure of the Pomeron in ep collisions
journal, May 1997

Hybrids: Mixed states of quarks and gluons
journal, August 1983

Evidence for exotic $J^{PC} {= 1}^{- +}$ meson production in the reaction $π^{-} \vec{p} η π^{-} p$ at $18 GeV / c$
journal, October 1999

New analysis of ηπ tensor resonances measured at the COMPASS experiment
text, January 2018

An Introduction to the Bootstrap
book, May 1994