This article presents the first measurement of the interaction between charm hadrons and nucleons. The two-particle momentum correlations of pD− and ¯pD+ pairs are measured by the ALICE Collaboration in high-multiplicity pp collisions at √s=13  TeV. The data are compatible with the Coulomb-only interaction hypothesis within (1.1–1.5)σ. The level of agreement slightly improves if an attractive nucleon (N)¯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 I=0 inverse scattering length of the N¯D state f−10,I=0∈[−0.4,0.9]  fm−1, assuming negligible interaction for the isospin I=1 channel.

First study of the two-body scattering involving charm hadrons / Acharya, S., Adamová, D., Adler, A., Adolfsson, J., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z., Ahmad, S., Ahn, S. u., Ahuja, I., Akbar, Z., Akindinov, A., Al-Turany, M., Alam, S. n., Aleksandrov, D., Alessandro, B., Alfanda, H. m., Alfaro Molina, R., Ali, B., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 106:5(2022). [10.1103/PhysRevD.106.052010]

First study of the two-body scattering involving charm hadrons

Fecchio, P.;
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 ¯pD+ pairs are measured by the ALICE Collaboration in high-multiplicity pp collisions at √s=13  TeV. The data are compatible with the Coulomb-only interaction hypothesis within (1.1–1.5)σ. The level of agreement slightly improves if an attractive nucleon (N)¯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 I=0 inverse scattering length of the N¯D state f−10,I=0∈[−0.4,0.9]  fm−1, assuming negligible interaction for the isospin I=1 channel.
2022
heavy-ion physics
charm
heavy flavour
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11768/209232
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