Doubly charm tetraquark channel with isospin 1 from lattice QCD

Meng, Lu (avtor), Ortiz Pacheco, Emmanuel (avtor), Baru, Vadim (avtor), Epelbaum, Evgeny (avtor), Padmanath, M. (avtor), Prelovšek, Saša (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: physics of elementary particles, lattice QCD
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FMF - Fakulteta za matematiko in fiziko
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2025
• Št. strani: Str. 034509-1-034509-15
• Številčenje: Vol. 111, iss. 3
• PID: 20.500.12556/RUL-167666
• UDK: 539.120.811
• ISSN pri članku: 2470-0010
• DOI: 10.1103/PhysRevD.111.034509
• COBISS.SI-ID: 228099075
• Datum objave v RUL: 05.03.2025

Gradivo je del revije

• Naslov: Physical review
• Skrajšan naslov: Phys. rev., D
• Založnik: American Physical Society
• ISSN: 2470-0010
• COBISS.SI-ID: 29757223

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: fizika osnovnih delcev, kvantna kromodinamika na mreži