Flavor decomposition of electromagnetic multipole moments in [q1q2][q̅3 c̅] tetraquarks: Light-quark analogs of Tcs1(2900)0 with JP = 1+
Abstract
We present a systematic study of the magnetic dipole and electric quadrupole moments of compact [q1 q2][q̅3 c̅] tetraquark states with quantum numbers JP = 1+, in the diquark--antidiquark picture and within the light-cone QCD sum rule framework. By performing a flavor decomposition across all admissible u/d configurations, we show that the charm-quark contribution to the electromagnetic moments vanishes algebraically at the operator level -- a structural feature of the specific spin organization adopted here, in which the heavy antiquark resides in a pseudoscalar antidiquark, distinct from the dynamical 1/mc suppression operative in alternative compact constructions and in hadronic molecules. The magnetic moments follow a coherent light-flavor pattern -- positive for uu-, negative for dd-, and suppressed for mixed-flavor diquarks -- and the quadrupole moments are non-zero throughout, corresponding, in the customary geometrical interpretation, to intrinsically deformed charge distributions. We further identify the dimensionless multipole ratio 𝒟/μ as a structural observable, independent of the normalization of the interpolating current, which probes the relative geometry of the spin-current and charge distributions complementary to the absolute moments. Taken together, the algebraic decoupling of the charm contribution and the operator-level distinction it implies among different singly-heavy tetraquark architectures constitute methodological signatures that discriminate among the corresponding internal organizations and, to the extent that a physical candidate is dominated by one of them, among compact and molecular interpretations.
Related
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BibTeX
@misc{ozdem2026flavor,
title = {{Flavor decomposition of electromagnetic multipole moments in $[q_1q_2][\bar q_3 \bar c]$ tetraquarks: Light-quark analogs of $T_cs1(2900)^0$ with $J^P = 1^+$}},
author = {Ulaş Özdem},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.27843},
eprint = {2610.27843},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.27843},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Flavor decomposition of electromagnetic multipole moments in [q_1q_2][q̅_3 c̅] tetraquarks: Light-quark analogs of T_cs1(2900)^0 with J^P = 1^+
AU - Ulaş Özdem
PY - 2026
DA - 2026/10/20
PB - arXiv
DO - 10.48550/arxiv.2610.27843
UR - https://arxiv.org/abs/2610.27843
AB - We present a systematic study of the magnetic dipole and electric quadrupole moments of compact [q_1 q_2][q̅_3 c̅] tetraquark states with quantum numbers J^P = 1^+, in the diquark--antidiquark picture and within the light-cone QCD sum rule framework. By performing a flavor decomposition across all admissible u/d configurations, we show that the charm-quark contribution to the electromagnetic moments vanishes algebraically at the operator level -- a structural feature of the specific spin organization adopted here, in which the heavy antiquark resides in a pseudoscalar antidiquark, distinct from the dynamical 1/m_c suppression operative in alternative compact constructions and in hadronic molecules. The magnetic moments follow a coherent light-flavor pattern -- positive for uu-, negative for dd-, and suppressed for mixed-flavor diquarks -- and the quadrupole moments are non-zero throughout, corresponding, in the customary geometrical interpretation, to intrinsically deformed charge distributions. We further identify the dimensionless multipole ratio 𝒟/μ as a structural observable, independent of the normalization of the interpolating current, which probes the relative geometry of the spin-current and charge distributions complementary to the absolute moments. Taken together, the algebraic decoupling of the charm contribution and the operator-level distinction it implies among different singly-heavy tetraquark architectures constitute methodological signatures that discriminate among the corresponding internal organizations and, to the extent that a physical candidate is dominated by one of them, among compact and molecular interpretations.
ER -