Electromagnetic form factors and structure of the $T_{bb}$ tetraquark
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| Format: | Preprint |
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2026
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| _version_ | 1866908855843160064 |
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| author | Vujmilovic, Ivan Collins, Sara Leskovec, Luka Prelovsek, Sasa |
| author_facet | Vujmilovic, Ivan Collins, Sara Leskovec, Luka Prelovsek, Sasa |
| contents | We present the first lattice QCD calculation of electromagnetic form factors of a tetraquark, focusing on the $T_{bb} = bb\bar u \bar d$ with quantum numbers $I(J^P) = 0(1^+)$. The electromagnetic current probes the charge monopole, magnetic dipole and the electric quadrupole distributions within the tetraquark. From it, we find evidence that its structure consists of a compact heavy diquark $[bb]$ in spin one, color-antitriplet configuration, and a light antidiquark $[\bar u \bar d]$ in spin zero, color-triplet configuration. The computations were performed on a single CLS ensemble with $N_f = 2+1$ dynamical quarks at a lattice spacing $a\approx 0.064$ fm and with a pion mass $m_π\approx 290$ MeV. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_24000 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Electromagnetic form factors and structure of the $T_{bb}$ tetraquark Vujmilovic, Ivan Collins, Sara Leskovec, Luka Prelovsek, Sasa High Energy Physics - Lattice We present the first lattice QCD calculation of electromagnetic form factors of a tetraquark, focusing on the $T_{bb} = bb\bar u \bar d$ with quantum numbers $I(J^P) = 0(1^+)$. The electromagnetic current probes the charge monopole, magnetic dipole and the electric quadrupole distributions within the tetraquark. From it, we find evidence that its structure consists of a compact heavy diquark $[bb]$ in spin one, color-antitriplet configuration, and a light antidiquark $[\bar u \bar d]$ in spin zero, color-triplet configuration. The computations were performed on a single CLS ensemble with $N_f = 2+1$ dynamical quarks at a lattice spacing $a\approx 0.064$ fm and with a pion mass $m_π\approx 290$ MeV. |
| title | Electromagnetic form factors and structure of the $T_{bb}$ tetraquark |
| topic | High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2602.24000 |