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Electromagnetic structure of charged and neutral strange vector mesons

Parada T. P. Hutauruk*

  • International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM2), Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan

  • *Contact author: phutauruk@hiroshima-u.ac.jp
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Phys. Rev. D 114, 054009 – Published 8 September, 2026

DOI: https://doi.org/10.1103/t2g6-thzh

Abstract

We investigate the electromagnetic form factors of the charged K*+(892) (us¯) and neutral K*0(896) (ds¯) strange vector mesons within the covariant Nambu–Jona-Lasinio model, employing the Schwinger proper-time regularization scheme to regularize ultraviolet divergences that incorporated the QCD aspect of the quark confinement. To this end, we evaluate the charge (electric) GC(Q2), magnetic moment GM(Q2), and quadrupole moment GQ(Q2) form factors and charge radii of the charged K*+(892) and neutral K*0(896) strange vector mesons. We find that the charge radii are ⟨r2⟩K*+=0.45  fm2 and ⟨r2⟩K*0=−0.04  fm2, respectively, while the magnetic moments are found μK*+=2.67 μN and μK*0=0.032 μN, consistent with other theoretical calculations and lattice QCD simulation results.

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Phys. Rev. D 114, 054009– Published 8 September, 2026
  • Received 28 July 2026
  • Accepted 11 August 2026
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