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Production of ηb in ultraperipheral Pb-Pb collisions

C. N. Azevedo, F. C. Sobrinho, and F. S. Navarra

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Phys. Rev. C 112, 064908 – Published 11 December, 2025

DOI: https://doi.org/10.1103/196s-xxkw

Abstract

Very recently, the two-photon decay width of the ηb meson was computed with lattice QCD methods. This decay has not yet been measured. The knowledge of this width allows for the calculation of the ηb production cross section through photon-photon interactions in ultraperipheral (UPC) Pb−Pb collisions. In this work we present this calculation, which is the first application of the lattice result. Since UPCs are gaining increasing attention of the heavy-ion community, we take the opportunity to perform a comprehensive study of the different ways of defining ultraperipheral collisions and of the different ways to treat the equivalent photon flux.

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Phys. Rev. C 112, 064908– Published 11 December, 2025
  • Received 2 January 2025
  • Revised 17 September 2025
  • Accepted 27 October 2025
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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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