High-energy η(′)π photoproduction and the nature of exotic waves
Year: 2025
Type: article
Abstract: 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.
Source: Physics Letters B
Authors: Glòria Montaña, Vincent Mathieu, Vanamali Shastry, Łukasz Bibrzycki, César Fernández-Ramírez, Nadine Hammoud, Robert J. Perry, Alessandro Pilloni, Arkaitz Rodas, Wyatt A. Smith, Adam P. Szczepaniak, Daniel Winney
Institutions: Thomas Jefferson National Accelerator Facility, Institut de Ciències del Cosmos, Universitat de Barcelona, Indiana University Bloomington, Indiana University, AGH University of Krakow, Universidad Nacional de Educación a Distancia, Massachusetts Institute of Technology, University of Messina, Istituto Nazionale di Fisica Nucleare, Sezione di Catania, Old Dominion University, Lawrence Berkeley National Laboratory, William & Mary, University of California, Berkeley, University of Bonn
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Funders: U.S. Department of Energy, Simons Foundation, Massachusetts Institute of Technology, Strong, Ministerio de Ciencia, Innovación y Universidades, European Commission, Horizon 2020 Framework Programme, Agència de Gestió d'Ajuts Universitaris i de Recerca, European Regional Development Fund, Agencia Estatal de Investigación, Thomas Jefferson National Accelerator Facility
Awards: G1175115578, THEORETICAL STUDIES OF INTERMEDIATE - ENERGY NUCLEAR PHYSICS, G14744916, G1553439044, G1728142190, G222768804, G2262748287, G2263355576, G2753074057, G294895050, G2988778103, G300979063, G3035362077, G3111662533, G3140718454, G3142173218, FY 2014-2016 TASK R - THEORETICAL NUCLEAR PHYSICS, The strong interaction at the frontier of knowledge: fundamental research and applications, G3480869486, G425668148, G4774512024, G5080475149, G624073364, G632107855, G683931746, G7084143925, G7340230215, G7451223319, G7520763071, G776309457, G7774527281, G8260697973, G8445699687, THEORETICAL STUDIES IN NUCLEAR AND HADRONIC PHYSICS, G8838489467
OpenAlex ID: W4417537413