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  • Open Access

Quark mass effects in octet baryon magnetic polarizabilities via lattice QCD

Thomas Kabelitz, Waseem Kamleh, and Derek Leinweber

  • Special Research Centre for the Subatomic Structure of Matter (CSSM), Department of Physics, University of Adelaide, Adelaide, South Australia 5005, Australia

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Phys. Rev. D 111, 114503 – Published 9 June, 2025

DOI: https://doi.org/10.1103/rbk1-82jh

Abstract

The quark mass dependence of octet baryon magnetic polarizabilities is examined at the level of individual quark-sector contributions in the uniform background-field approach of lattice QCD. The aim is to understand the direct impact of increasing the mass of a quark flavor on the magnetic polarizability and indirect or environmental effects associated with changing the mass of spectator quarks, insensitive to the background magnetic field. Noting the need to set the electric charge of some quark flavors to zero, a fractionally charged baryon formalism is introduced. We find that increasing the mass of the charged quark flavor directly causes its contribution to the magnetic polarizability to decrease. However, increasing the mass of the spectator quark flavor indirectly acts to increase the magnetic polarizability. To gain a deeper understanding of these effects, we evaluate the predictions of the constituent quark model in this context. While the model provides a compelling explanation for the environmental effect of varying the spectator quark mass, an explanation of the direct mass dependence is more complicated as competing factors combine in the final result. The lattice results indicate the key factor is a reduction in the constituent quark magnetic moment with increasing quark mass, as it governs the strength of the magnetic transition to the nearby decuplet baryon.

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Phys. Rev. D 111, 114503– Published 9 June, 2025
  • Received 27 October 2024
  • Accepted 13 May 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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