Photo- and hadron-production of mesons


  • Łukasz Bibrzycki Pedagogical University of Krakow



hadron spectroscopy, Regge exchange, photoproduction, resonances


We discuss the πη(‘) production in the double Regge model. We also identify the dominant exchanges necessary to describe the πη(‘) system for energies above the resonance region. The model explains the forward-backward asymmetry observed in this reaction by associating it with the exotic P−wave, which in turn is related to the production of the putative π1 hybrid meson. We also discuss the π +π − production through two complementary mechanisms - direct resonance production (with subsequent π +π − decay) and the Deck mechanism. The interference of the Deck and direct production explains the di-pion mass distribution for invariant masses below 2 GeV. Model predictions are compatible with the qq¯ nature of the lightest P− and D−wave resonances, whereas they hint towards substantial molecular or tetraquark component of the f0(980).


A. P. Szczepaniak and M. Swat, Role of photoproduction in exotic meson searches, Phys. Lett. B 516 (2001) 72

B. Ketzer, B. Grube and D. Ryabchikov, Light-Meson Spectroscopy with COMPASS, Prog. Part. Nucl. Phys. 113 (2020) 103755

C. Adolph et al. [COMPASS], Odd and even partial waves of ηπ− and η 0π − in π −p → η (‘)π −p at 191 GeV/c, Phys. Lett. B 740 (2015) 303 [erratum: Phys. Lett. B 811, 135913 (2020)]

M. Battaglieri et al. [CLAS], Photoproduction of pi+ pi- meson pairs on the proton, Phys. Rev. D 80 (2009) 072005

R. C. Brower, C. E. DeTar and J. H. Weis, Regge Theory for Multiparticle Amplitudes, Phys. Rept. 14 (1974) 257

L. Bibrzycki et al. [JPAC], ,” π −p → η (‘) π −p in the doubleRegge region Eur. Phys. J. C 81 (2021) 647 [erratum: Eur. Phys. J. C 81, no.10 (2021) 915]

I. J. R. Aitchison and M. G. Bowler, Rescattering Effects in the Deck Model, J. Phys. G 3 (1977) 1503

Ł. Bibrzycki, P. Bydžovský, R. Kamiński and A. P. Szczepaniak, Meson resonances in forward-angle π +π − photoproduction, Phys. Lett. B 789 (2019) 287

SAID, R.L. Workman, R.A. Arndt, W.J. Briscoe, M.W. Paris, I.I. Strakovsky, Phys. Rev. C 86 (2012) 035202;

P. Bydžovský, R. Kamiński and V. Nazari, Dispersive analysis of the S-, P-, D-, and F-wave ππ amplitudes Phys. Rev. D 94 (2016) 116013




How to Cite

Bibrzycki Łukasz. Photo- and hadron-production of mesons. Supl. Rev. Mex. Fis. [Internet]. 2022 Jun. 9 [cited 2024 May 20];3(3):0308022 1-5. Available from: