High-energy $η^{(')}π$ photoproduction and the nature of exotic waves

Montaña, Glòria; Mathieu, Vincent; Shastry, Vanamali; Bibrzycki, Łukasz; Fernández-Ramírez, César; Hammoud, Nadine; Perry, Robert J.; Pilloni, Alessandro; Rodas, Arkaitz; Smith, Wyatt A.; Szczepaniak, Adam P.; Winney, Daniel

doi:10.1016/j.physletb.2025.140101

High-energy $$η^{(')}π$$ photoproduction and the nature of exotic waves

Journal Article · Sun Dec 21 00:00:00 EST 2025 · Physics Letters. B

DOI:https://doi.org/10.1016/j.physletb.2025.140101· OSTI ID:3011736

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Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Univ. de Barcelona (Spain)
Univ. de Barcelona (Spain)
Indiana Univ., Bloomington, IN (United States)
AGH - Univ. of Krakow (Poland)
Univ. Nacional de Educación a Distancia (UNED), Madrid (Spain)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Univ. degli Studi di Messina (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Catania (Italy)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Old Dominion Univ., Norfolk, VA (United States)
College of William and Mary, Williamsburg, VA (United States); Univ. degli Studi di Messina (Italy); Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Indiana Univ., Bloomington, IN (United States)
Univ. of Bonn (Germany)

The observation of hybrid mesons in photoproduction experiments can provide essential insight into the inner workings of quantum chromodynamics in the strong coupling regime. In particular, the study of final $$η^{(')}π$$ states is of great interest due to the presence of the lowest lying hybrid candidate with manifestly exotic quantum numbers, the $$π_1$$(1600). In this work, a double-vector exchange model with Reggeized $$ρ$$ and $$ω$$ trajectories is developed to describe the photoproduction of $$η^{(')}π$$ in the high-mass region. Results are presented for the differential cross sections and forward-backward asymmetries in the energy region of interest to the GlueX experiment. The model contains no free parameters, and reproduces the magnitude and t-dependence of existing CLAS data at $$E_γ$$ = 5 GeV. The model predicts a stronger asymmetry in the $η'π$ channel than in the $ηπ$ channel, consistent with what has previously been observed in pion beam experiments. This suggests that the sizeable production of exotic odd waves in $η'π$ is not necessarily related to the presence of gluon-rich environments. Confirmation of these predicted asymmetries from forthcoming GlueX data would enable further predictions of the low-energy spectrum.

View Accepted Manuscript (DOE)

Research Organization:: Indiana Univ., Bloomington, IN (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-06OR23177; FG02-87ER40365; SC0011090; SC0023598

OSTI ID:: 3011736

Alternate ID(s):: OSTI ID: 3017275

Report Number(s):: DOE/OR/23177--8020; JLAB-THY--25-4567

Journal Information:: Physics Letters. B, Journal Name: Physics Letters. B Vol. 872; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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