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  • Letter
  • Open Access

Why quarkonium hybrid coupling to two S-wave heavy-light mesons is not suppressed

R. Bruschini*

  • Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA

  • *bruschini.1@osu.edu
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Phys. Rev. D 109, L031501 – Published 5 February, 2024

DOI: https://doi.org/10.1103/PhysRevD.109.L031501

Abstract

We examine the couplings of quarkonium hybrids to heavy-light meson pairs in the Born-Oppenheimer approximation for QCD. The lowest hybrid multiplets consist of bound states of the Πu and Σu− potentials. We find that the Σu− potential can couple to pairs of S-wave mesons through string breaking, while the Πu potential cannot. From this observation, we derive model-independent selection rules that contradict previous expectations that quarkonium hybrids are forbidden to decay into pairs of S-wave mesons. These Born-Oppenheimer selection rules are consistent with the partial decay widths of the lowest charmonium hybrid with exotic quantum numbers JPC=1−+ recently calculated using lattice QCD.

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Phys. Rev. D 109, L031501– Published 5 February, 2024
  • Received 30 June 2023
  • Accepted 22 January 2024
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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.

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