20.500.12556/RUL-167666 Doubly charm tetraquark channel with isospin 1 from lattice QCD Experimentally, the doubly charm tetraquark channel $cc\bar{q}\bar{q}$ with $q=u$, $d$ features an exotic hadron, $T_{cc}$, with isospin $I=0$ near the $DD^*$ threshold, while no peak was observed for $I=1$. We present a lattice QCD study of this channel with $I=1$, $J^P=1^+$,and $m_{\pi} \simeq 280$ MeV. Finite-volume energies calculated across five charm quark masses consistently feature a positive energy shift with respect to noninteracting energies, indicating repulsive interaction at energies near the threshold. These energies are used to compute the $DD^*$ scattering amplitude using both the standard Lüscher method and the recently proposed effective field theory-based approach in the plane wave basis, which incorporates the long-range interactions and the left-hand cut. Both analyses render a small negative scattering length and a scattering amplitude that does not feature any poles in the energy region near the $DD^*$ threshold, in line with the LHCb results. We identify that the Wick contraction, resembling $t$-channel isovector-vector meson exchanges between $D$ and $D^*$, plays a key role in distinguishing between the $I=0$ and $I=1$ channels, leading to repulsion in the $I=1$ and attraction in the $I=0$ channel. physics of elementary particles lattice QCD fizika osnovnih delcev kvantna kromodinamika na mreži true false true Angleški jezik Slovenski jezik Članek v reviji 2025-03-05 16:30:18 2025-03-05 16:30:19 2025-03-06 04:01:05 0000-00-00 00:00:00 2025 0 0 Str. 034509-1-034509-15 iss. 3 Vol. 111 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 539.120.811 2470-0010 10.1103/PhysRevD.111.034509 228099075 PhysRevD.111.034509.pdf PhysRevD.111.034509.pdf 1 015534BB312F21CF95BFDDA262473184 d53f4eccdce7ccf83fe8cf70b3573d6145cc14875c760815369a6ccb66d34d2b d495788a-f9d7-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=200369 https://journals.aps.org/prd/abstract/10.1103/PhysRevD.111.034509 0 de050574-f9d7-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=200370 Fakulteta za matematiko in fiziko 0 0 0