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arXiv · 2410.12465

Revisiting the proton-antiproton scattering using a constituent-quark-model based coupled-channels calculation

P. G. Ortega·D. R. Entem·F. Fernandez·J. Segovia
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Abstract

Motivated by the last experimental and theoretical advances in the analysis of possible baryonium resonances, the $X(1835)$ and their partners, we perform a constituent-quark-model based coupled-channels calculation of the proton-antiproton scattering in order to analyze the possible existence of bound states or near-threshold structures. The used $N\overline N$ potential is derived from a $G$-parity transformation of the quark-model-based $NN$ interaction which has described well deuteron properties, $NN$ phase shifts, and even hadron-hadron phenomenology. The additional $N\overline N$ annihilation is taken into account by a complex phenomenological potential whose real part is generated by one-pion and one-gluon exchange annihilation potentials and its imaginary part is an energy-independent potential of Gaussian form. Then, all the parameters of the interaction are constrained by the $NN$ sector except those determining the imaginary part of the annihilation potential. Our study concludes that the nucleon-antinucleon dynamics is complex and rich in scattering singularities near the proton-antiproton and neutron-antineutron thresholds.

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P. G. Ortega, D. R. Entem, F. Fernandez, J. Segovia. 2024-10-16. Revisiting the proton-antiproton scattering using a constituent-quark-model based coupled-channels calculation. https://arxiv.org/abs/2410.12465

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