Person: Mathieu, Vincent
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First Name
Vincent
Last Name
Mathieu
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Físicas
Department
Física Teórica
Area
Física Teórica
Identifiers
3 results
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Item Dynamics in near-threshold J / ψ photoproduction(Physical Review D, 2023) Winney, D.; Fernández-Ramírez, C.; Pilloni, A.; Hiller Blin, A.N.; Albaladejo, M.; Bibrzycki, L.; Hammoud, N.; Liao, J.; Mathieu, Vincent; Montaña, G.; Perry, R.J.; Shastry, V.; Smith, W.A.; Szczepaniak, A.P.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.Item π− p → η() π− p in the double-Regge region(The European Physical Journal C, 2021) Bibrzycki, Ł.; Fernández Ramírez, C.; Mathieu, Vincent; Mikhasenko, M.; Albaladejo, M.; Hiller Blin, A. N.; Pilloni, A.; Szczepaniak, A. P.The production of η(′)π pairs constitutes one of the golden channels to search for hybrid exotics, with explicit gluonic degrees of freedom. Understanding the dynamics and backgrounds associated to η(′)π production above the resonance region is required to impose additional constraints to the resonance extraction. We consider the reaction π−p→η(′)π−p measured by COMPASS. We show that the data in 2.4Item Ambiguities in partial wave analysis of two spinless meson photoproduction(Physical Review D, 2023) Smith, W. A.; Glazier, D. I.; Mathieu, Vincent; Albaladejo, M.; Albrecht, M.; Baldwin, Z.; Fernandez-Ramirez, C.; Hammoud, N.; Mikhasenko, M.; Montaña, G.; Perry, R. J.; Pilloni, A.; Shastry, V.; Szczepaniak, A. P.; Winney, D.We describe the formalism to analyze the mathematical ambiguities arising in partial-wave analysis of two spinless mesons produced with a linearly polarized photon beam. We show that partial waves are uniquely defined when all accessible observables are considered, for a wave set which includes S and D waves. The inclusion of higher partial waves does not affect our results, and we conclude that there are no mathematical ambiguities in partial-wave analysis of two mesons produced with a linearly polarized photon beam. We present Monte Carlo simulations to illustrate our results.