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Hidden-charm pentaquark formation in antiproton-deuterium collisions

William I. Fine Theoretical Physics Institute, University of Minnesota, Minneapolis, Minnesota 55455, USA, School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA and Institute of Theoretical and Experimental Physics, Moscow 117218, Russia

Phys. Rev. D 99, 093003 – Published 14 May, 2019

DOI: https://doi.org/10.1103/PhysRevD.99.093003

Abstract

The possibility of observing formation of hidden-charm pentaquarks as $s$ -channel resonances in antiproton-deuteron collisions is discussed. It is pointed out that the masses of the reported by LHCb pentaquark resonances in the $J / ψ p$ channel are very close to a special value of the mass at which formation of a pentaquark by antiproton incident on a deuteron at rest requires exactly the same momentum of the $\bar{p}$ as needed for the formation in the $s$ channel of the charmonium resonance in $\bar{p} p$ collisions with the proton being at rest. For this reason the former process can be rather completely described within the notion of the deuteron being a shallow bound state of two nucleons without resorting to models describing its short-distance structure. It is argued that a similar kinematical coincidence can be expected for (yet) hypothetical pentaquark resonances in the $η_{c} N$ channel, and that these can be sought for once antiproton-deuterium collisions become available for experimentation.

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References (17)

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Phys. Rev. D 99, 093003– Published 14 May, 2019

Vol. 99, Iss. 9 — 1 May 2019

Received 18 March 2019

DOI: https://doi.org/10.1103/PhysRevD.99.093003

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

Published by the American Physical Society

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Hidden-charm pentaquark formation in antiproton-deuterium collisions

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