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  • Letter
  • Open Access

Two-photon decay of X(6900) from light-by-light scattering at the LHC

Volodymyr Biloshytskyi and Vladimir Pascalutsa

Lucian Harland-Lang

Bogdan Malaescu

Kristof Schmieden and Matthias Schott

  • Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55128 Mainz, Germany

  • Rudolf Peierls Centre, Beecroft Building, Parks Road, Oxford OX1 3PU, United Kingdom

  • LPNHE, Sorbonne Université, Université Paris Cité, CNRS/IN2P3, 75252 Paris, France

  • Institut für Physik, Johannes Gutenberg-Universität Mainz, D-55128 Mainz, Germany

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Phys. Rev. D 106, L111902 – Published 13 December, 2022

DOI: https://doi.org/10.1103/PhysRevD.106.L111902

Abstract

The LHCb Collaboration has recently discovered a structure around 6.9 GeV in the double-J/ψ mass distribution, possibly a first fully charmed tetraquark state X(6900). Based on vector-meson dominance (VMD) such a state should have a significant branching ratio for decaying into two photons. We show that the recorded LHC data for the light-by-light scattering may indeed accommodate for such a state, with a γγ branching ratio of order of 10−4, which is larger even than the value inferred by the VMD. The spin-parity assignment 0−+ is in better agreement with the VMD prediction than 0++, albeit not significantly at the current precision. Further light-by-light scattering data in this region, clarifying the nature of this state, should be obtained in the Run 3 and probably in the high-luminosity phase of the LHC (Run 4 etc.).

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Phys. Rev. D 106, L111902– Published 13 December, 2022
  • Received 15 August 2022
  • Accepted 2 November 2022
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