We investigate quarkonia production in proton-proton collisions, indicating the effectiveness of the Wigner density method.
We investigate the charmonium and bottomonium production in $pp$ collisions using the Wigner densities formalism. The Wigner density of the quarkonia is approximated by analytical 3-D isotropic harmonic oscillator Wigner densities with the same root-mean-square radius given by the solution of the Schr\"odinger equation. This approach reproduces quite well the available experimental transverse momentum and rapidity distributions.
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Joerg Aichelin (2026) studied this question.
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