This article presents the first measurement of the interaction between charm hadrons and nucleons. The two-particle momentum correlations of pD− and p ̄Dþ pairs are measured by the ALICE Collaboration in pffiffi high-multiplicity pp collisions at s 1⁄4 13 TeV. The data are compatible with the Coulomb-only interaction hypothesis within ð1.1–1.5Þσ. The level of agreement slightly improves if an attractive nucleon ðNÞD ̄ 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 I 1⁄4 0 inverse scattering length of the ND ̄ state f−1 ∈ 1⁄2−0.4; 0.9 fm−1, assuming 0;I1⁄40 negligible interaction for the isospin I 1⁄4 1 channel.

First study of the two-body scattering involving charm hadrons

P. Camerini;G. Contin;C. De Martin;M. Faggin;E. Fragiacomo;G. Luparello;G. ???V. Margagliotti;S. Piano;R. Rui;V. Zaccolo;
2022-01-01

Abstract

This article presents the first measurement of the interaction between charm hadrons and nucleons. The two-particle momentum correlations of pD− and p ̄Dþ pairs are measured by the ALICE Collaboration in pffiffi high-multiplicity pp collisions at s 1⁄4 13 TeV. The data are compatible with the Coulomb-only interaction hypothesis within ð1.1–1.5Þσ. The level of agreement slightly improves if an attractive nucleon ðNÞD ̄ 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 I 1⁄4 0 inverse scattering length of the ND ̄ state f−1 ∈ 1⁄2−0.4; 0.9 fm−1, assuming 0;I1⁄40 negligible interaction for the isospin I 1⁄4 1 channel.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/3038398
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