First study of the two-body scattering involving charm hadrons

Abstract

This article presents the first measurement of the interaction between charm hadrons and nucleons. The two-particle momentum correlations of $\mathrm{p}{\mathrm{D}}^{-}$ and ${\overline{\mathrm{p}}\mathrm{D}}^{+}$ pairs are measured by the ALICE Collaboration in high-multiplicity pp collisions at $\sqrt{s}=13\mathrm{TeV}$. The data are compatible with the Coulomb-only interaction hypothesis within (1.1-1.5)$\sigma$. The level of agreement slightly improves if an attractive nucleon(N)$\overline{\mathrm{D}}$ strong interaction is considered, in contrast to most model predictions which suggest an overall repulsive interaction. This measurement allows for the first time an estimation of the 68% confidence level interval for the isospin $\mathrm{I}=0$ inverse scattering length of the $\mathrm{N}\overline{\mathrm{D}}$ state $f_{0,\mathrm{I}=0}^{-1}\in [-0.4,0.9]\mathrm{f}{\mathrm{m}}^{-1}$, assuming negligible interaction for the isospin $\mathrm{I}=1$ channel.

22 pages, 5 captioned figures, 1 table, authors from page 17, published version, figures at http://alice-publications.web.cern.ch/node/7630

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