THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS |
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Empirical Determination of the Pion Mass Distribution |
Y.-Z. Xu1,2, K. Raya1, Z.-F. Cui3,4, C. D. Roberts3,4*, and J. Rodríguez-Quintero1 |
1Dpto. Ciencias Integradas, Centro de Estudios Avanzados en Fis., Mat. y Comp., Fac. Ciencias Experimentales, Universidad de Huelva, Huelva 21071, Spain 2Dpto. Sistemas Físicos, Químicos y Naturales, Univ. Pablo de Olavide, E-41013 Sevilla, Spain 3School of Physics, Nanjing University, Nanjing 210093, China 4Institute for Nonperturbative Physics, Nanjing University, Nanjing 210093, China
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Cite this article: |
Y.-Z. Xu, K. Raya, Z.-F. Cui et al 2023 Chin. Phys. Lett. 40 041201 |
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Abstract Existing pion+nucleus Drell-Yan and electron+pion scattering data are used to develop ensembles of model-independent representations of the pion generalized parton distribution (GPD). Therewith, one arrives at a data-driven prediction for the pion mass distribution form factor, $\theta_2^\pi $. Compared with the pion elastic electromagnetic form factor, $\theta_2^\pi$ is harder: the ratio of the radii derived from these two form factors is $r_\pi^{\theta_2}/r_\pi = 0.79(3)$. Our data-driven predictions for the pion GPD, related form factors and distributions should serve as valuable constraints on theories of pion structure.
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Received: 02 March 2023
Express Letter
Published: 24 March 2023
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PACS: |
12.38.Aw
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(General properties of QCD (dynamics, confinement, etc.))
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Abstract
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