Year: 2024
Type: article
Abstract: A bstract Distribution amplitudes are functions of non-perturbative matrix elements describing the hadronization of quarks and gluons. Thanks to factorization theorems, they can be used to compute the scattering amplitude of high-energy processes. Recently, new ideas have allowed their computation using lattice QCD, which should provide us with a general, fully relativistic determination. We present the first lattice calculation of the η c -meson distribution amplitude at leading twist. Starting from the relevant matrix element in discrete Euclidean space on a set of N f = 2 CLS ensembles, we explain the method to connect to continuum Minkowski spacetime. After addressing several sources of systematic uncertainty, we compare to Dyson-Schwinger and non-relativistic QCD determinations of this quantity. We find significant deviations between the latter and our result even at small Ioffe times.
Source: Journal of High Energy Physics
Institutions: Centre National de la Recherche Scientifique, Université Paris-Saclay, Institut National de Physique Nucléaire et de Physique des Particules, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie, Laboratoire de Physique Subatomique et de Cosmologie, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Institut de Recherche sur les Lois Fondamentales de l'Univers, Département de Physique Nucléaire
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4402658266