RT Journal Article
T1 Dynamics in near-threshold  J / ψ  photoproduction
A1 Winney, D.
A1 Fernández-Ramírez, C.
A1 Pilloni, A.
A1 Hiller Blin, A.N.
A1 Albaladejo, M.
A1 Bibrzycki, L.
A1 Hammoud, N.
A1 Liao Chen, Jau-Chyn
A1 Mathieu, Vincent
A1 Montaña, G.
A1 Perry, R.J.
A1 Shastry, V.
A1 Smith, W.A.
A1 Szczepaniak, A.P.
AB The study of J/ψ photoproduction at low energies has consequences for the understanding of multiple aspects of nonperturbative QCD, ranging from mechanical properties of the proton to the binding inside nuclei and the existence of hidden-charm pentaquarks. Factorization of the photon-cc¯ and nucleon dynamics or vector meson dominance are often invoked to justify these studies. Alternatively, open-charm intermediate states have been proposed as the dominant mechanism underlying J/ψ photoproduction. As the latter violates this factorization, it is important to estimate the relevance of such contributions. We analyze the latest differential and integrated photoproduction cross sections from the GlueX and J/ψ-007 experiments. We show that the data can be adequately described by a small number of partial waves, which we parametrize with generic models enforcing low-energy unitarity. The results suggest a non-negligible contribution from open-charm intermediate states. Furthermore, most of the models present an elastic scattering length incompatible with previous extractions based on vector meson dominance and thus call into question its applicability to heavy mesons. Our results indicate a wide array of physics possibilities that are compatible with present data and need to be disentangled.
PB American Physical Society
SN 2470-0010
YR 2023
FD 2023-09-01
LK https://hdl.handle.net/20.500.14352/103069
UL https://hdl.handle.net/20.500.14352/103069
LA eng
NO 2023 Descuento SCOAP
NO U.S. Department of Energy
NO U.S. National Science Foundation
NO Ministerio de Ciencia e Innovación (España)
NO National Natural Science Foundation of China
NO Deutsche Forschungsgemeinschaft (DFG)
NO Ministerio de Educación y Formación Profesional (España)
NO Generalitat Valenciana
NO National Science Center (Poland)
DS Docta Complutense
RD 10 abr 2025