20.500.12556/RUL-170626 Doubly heavy tetraquarks from lattice QCD incorporating diquark-antidiquark operators and the left-hand cut Lattice studies of the doubly charm tetraquark $T_{cc}=cc\bar{u}\bar{d}$ require the determination of the $DD^*$ scattering amplitude, which most often incorporate only meson-meson interpolators. We additionally incorporate diquark-antidiquark operators and find that these have some impact on certain eigenenergies. This study presents the first extraction of the $DD^*$ scattering amplitude based on the meson-meson as well as diquark antidiquark interpolators. The effect of the additional operators renders slightly smaller values of $p$ cot$\delta_0$ and a $T_{cc}$ pole slightly closer to the threshold. The scattering amplitude is extracted from eigenenergies by adopting plane-wave and effective-field-theoretic methods, which also incorporate the left-hand cut and address the partial wave mixing. The $T_{cc}$ is found to be a subthreshold resonance with a pole at $m_{T_{cc}}-m_D-m_{D^*}=-5.2_{-0.8}^{+0.7}- i \cdot 6.3_{-4.8}^{+2.4}~\mathrm{MeV}$, employing coordinated lattice simulations (CLS) ensembles with $m_{\pi}\simeq 280~\mathrm{MeV}$ and the distillation method. A more significant effect of diquark-antidiquark operators on eigen-energies is found for larger heavy quark masses relevant for $T_{bb}$. We find that deeply bound T bb does not emerge when employing only meson-meson operators, where each meson is separately momentum projected, while the deeply bound state emerges after adding local diquark antidiquark operators. physics of elementary particles lattice QCD fizika osnovnih delcev kvantna kromodinamika na mreži true false true Angleški jezik Slovenski jezik Članek v reviji 2025-07-10 13:52:06 2025-07-10 13:52:07 2025-07-21 14:50:22 0000-00-00 00:00:00 2025 0 0 22 str. iss. 1 Vol. 112 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 539.120.811 2470-0010 10.1103/rlgp-c9tb 241992707 rlgp-c9tb.pdf rlgp-c9tb.pdf 1 5FAD23EA2B87824A30D2A1883AC56BE5 16c1e77047ae5830f819bc9afb3557ae3b11f9604c0e4f42f77c69357b01cd07 16acd59f-5d83-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=212661 https://journals.aps.org/prd/abstract/10.1103/rlgp-c9tb 0 5324d715-5d83-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=212662 Fakulteta za matematiko in fiziko 0 0 0