Amplitude analysis of ηπ final states at glueX


  • Colin Gleason Union College



GlueX; Jefferson lab


The primary goal of the GlueX experiment at Jefferson Lab is to map the spectrum of light hybrid mesons. GlueX, which has a linearly polarized photon beam and a large acceptance for both charged and neutral particles, has access to both the neutral, γp → ηπ0 p, and charged, γp → ηπ−∆++, final states. These proceedings will discuss the amplitude analysis of ηπ channels at GlueX with a focus on the study of the production of the a2(1320) meson as function of Mandelstam t.


J. J. Dudek et al. Toward the excited isoscalar meson spectrum from lattice QCD. Phys. Rev. D 88.9 (2013) 094505.

D. Alde et al. Evidence for a 1 +− Exotic Meson. Phys. Lett. B 205 (1988) 397.

H. Aoyagi et al., Study of the ηπ− system in the π −p reaction at 6.3 GeV/c. Phys. Lett. B 314 (1993) 246-254.

G. M. Beladidze et al., Study of π −pN→ ηπ−p and πN → η 0π − N reactions at 37 GeV/c. Phys. Lett. B 313 (1993) 276,

Yu. P. Gouz et al., Study of the wave with JP C = 1−+ in the partial wave analysis of η 0π −, ηπ− f1π − and ρ 0π − systems produced in π −N interactions at Pπ− = 37 GeV/c. AIP Conf. Proc. 272 (2008) 572-576.

D. V. Amelin et al. Investigation of hybrid states in the VES experiment at the Institute for High Energy Physics (Protvino). Phys. Atom. Nucl. 68 (2005) 359-371.

V. Dorofeev, New results from VES. Frascati Phys. Ser. 15 (1999) 3. 8. D. R. Thompson et al. Evidence for exotic meson production in the reaction π −p → ηπ−at 18 GeV/c. Phys. Rev. Lett. 79 (1997) 1630.

G. S. Adams et al., Confirmation of a π 0 1 Exotic Meson in the ηπ0 System. Phys. Lett. B 657 (2007) 27,

E. I. Ivanov et al., Observation of exotic meson production in the reaction π − → η 0πp at 18 GeV/c. Phys. Rev. Lett. 86 (2001) 3977. https://doi.1103/PhysRevLett.86.3977.

A. Abele et al., Exotic πη state in anti-p d annihilation at rest into π 0π +π −(spectator). Phys. Lett. B 423 (1998) 175.

A. Abele et al., Evidence for a πη P wave in anti-p p annihilations at rest into π 0π 0 η. Phys. Lett. B 446 (1999) 349,

G. S. Adams et al., Amplitude analyses of the decays χc1 → ηπ+π − and χc1 → η 0π +π −. Phys. Rev. D 84 (2011) 112009.

C. Adolph et al. Odd and even partial waves of ηπ− and η 0π − in π −p → η 0π −p at 191 GeV/c. Phys. Let. B 740 (2015) 303. issn: 0370-2693.

A. Rodas et al. Determination of the pole position of the lightest hybrid meson candidate. Phys. Rev. Lett. 122.4 (2019) 042002.

S. Adhikari et al., The GlueX beamline and detector. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 987 (2021) 164807,

P. Pauli, Accessing glue through photoproduction measurements at GlueX. In: 19th International Conference on Hadron Spectroscopy and Structure. Dec. 2021. arXiv:2112.05633[hep-ex].

S. Adhikari et al., Measurement of beam asymmetry for π −∆++ photoproduction on the proton at Eγ = 8.5 GeV. Phys. Rev. C 103 (2021) L022201.

S. Adhikari et al. Measurement of the photon beam asymmetry in γ → K+ P0 at E 0 γ = 8.5 GeV . In: Phys. Rev. C 101 (6 June 2020), p. 065206.

S. Adhikari et al. Beam asymmetry P for the photoproduction of η and η 0 mesons at Eγ = 8.8 GeV. Phys. Rev. C 100 (2019) 052201.

H. Al Ghoul et al. Measurement of the beam asymmetry P for π 0 and η photoproduction on the proton at Eγ = 9 GeV. Phys. Rev. C 95 (2017) 042201.

A. J. Woss et al. Decays of an exotic 1-+ hybrid meson resonance in QCD. Phys. Rev. D 103.5 (2021) 054502.

V. Mathieu et al. Moments of angular distribution and beam asymmetries in ηπ0 photoproduction at GlueX. Phys. Rev. D 100 (2019) 054017,

V. Mathieu et al., Exclusive tensor meson photoproduction. Phys. Rev. D 102 (2020) 014003.

A. Celentano et al. First measurement of direct photoproduction of the a2(1320)0 meson on the proton. Phys. Rev. C 102 (2020) 032201.




How to Cite

Gleason C. Amplitude analysis of ηπ final states at glueX. Supl. Rev. Mex. Fis. [Internet]. 2022 Aug. 3 [cited 2022 Dec. 7];3(3):0308021 1-4. Available from: