Deciphering the nature of $P^Σ_{ψs}$ pentaquarks in the light of their electromagnetic multipole moments
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2026
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| _version_ | 1866914589595140096 |
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| author | Özdem, Ulaş |
| author_facet | Özdem, Ulaş |
| contents | We calculate electromagnetic multipole moments of $Σ$-type strange hidden-charm pentaquarks $P^Σ_{ψs}$ (isospin triplet $Σ^+,Σ^0,Σ^-$) using QCD light-cone sum rules, with six (spin-1/2) and seven (spin-3/2) interpolating currents built from diquark-diquark-antiquark operators. We compute magnetic dipole $μ$ for all channels and, for spin-3/2, electric quadrupole ${\cal Q}$ and magnetic octupole ${\cal O}$ moments (first computation), and give the first quark-flavor decomposition. Scalar diquark currents yield charm-dominated, flavor-insensitive moments ($μ\in[-1.92,-1.21]μ_N$ for spin-1/2, $|μ|\lesssim1.2μ_N$ for spin-3/2), consistent with heavy-quark spin symmetry. Axial-vector diquark currents produce larger, flavor-sensitive moments with sign reversals governed by $e_u/e_d=-2$. For ${\cal Q}$, scalar-diquark currents give oblate deformations ($Q_0\approx-2.0\times10^{-2}{\rm fm}^2$) dominated by charm, while two-axial-vector-diquark currents predict prolate values up to $Q_0=+8.0\times10^{-2}{\rm fm}^2$, with sign reversal for $[su][uc]\bar{c}$ in two currents. Currents with scalar antiquark coupling yield a topology-independent octupole ${\cal O}\approx-0.25\times10^{-3}{\rm fm}^3$, a lattice QCD benchmark. Comparison with constituent quark models identifies four discriminants: $|μ|\gtrsim3μ_N$ in spin-1/2; sign of $μ$ for $[su][uc]\bar{c}$ in spin-3/2; non-zero ${\cal Q}$ (vanishes in $S$-wave molecules); and the ${\cal Q}$-${\cal O}$ sign correlation, probing $1/m_q$ weighting. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_12533 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Deciphering the nature of $P^Σ_{ψs}$ pentaquarks in the light of their electromagnetic multipole moments Özdem, Ulaş High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice We calculate electromagnetic multipole moments of $Σ$-type strange hidden-charm pentaquarks $P^Σ_{ψs}$ (isospin triplet $Σ^+,Σ^0,Σ^-$) using QCD light-cone sum rules, with six (spin-1/2) and seven (spin-3/2) interpolating currents built from diquark-diquark-antiquark operators. We compute magnetic dipole $μ$ for all channels and, for spin-3/2, electric quadrupole ${\cal Q}$ and magnetic octupole ${\cal O}$ moments (first computation), and give the first quark-flavor decomposition. Scalar diquark currents yield charm-dominated, flavor-insensitive moments ($μ\in[-1.92,-1.21]μ_N$ for spin-1/2, $|μ|\lesssim1.2μ_N$ for spin-3/2), consistent with heavy-quark spin symmetry. Axial-vector diquark currents produce larger, flavor-sensitive moments with sign reversals governed by $e_u/e_d=-2$. For ${\cal Q}$, scalar-diquark currents give oblate deformations ($Q_0\approx-2.0\times10^{-2}{\rm fm}^2$) dominated by charm, while two-axial-vector-diquark currents predict prolate values up to $Q_0=+8.0\times10^{-2}{\rm fm}^2$, with sign reversal for $[su][uc]\bar{c}$ in two currents. Currents with scalar antiquark coupling yield a topology-independent octupole ${\cal O}\approx-0.25\times10^{-3}{\rm fm}^3$, a lattice QCD benchmark. Comparison with constituent quark models identifies four discriminants: $|μ|\gtrsim3μ_N$ in spin-1/2; sign of $μ$ for $[su][uc]\bar{c}$ in spin-3/2; non-zero ${\cal Q}$ (vanishes in $S$-wave molecules); and the ${\cal Q}$-${\cal O}$ sign correlation, probing $1/m_q$ weighting. |
| title | Deciphering the nature of $P^Σ_{ψs}$ pentaquarks in the light of their electromagnetic multipole moments |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2604.12533 |