Toward the quark mass dependence of $T_{cc}^+$ from lattice QCD

Collins, Sara (avtor), Nefediev, Alexey (avtor), Padmanath, M. (avtor), Prelovšek, Saša (avtor)

The $DD^*$ scattering phase shifts in the $T_{cc}^+ = cc\bar{u}\bar{d}$ channel are extracted from lattice QCD for five different charm quark masses and a fixed light-quark mass corresponding to $m_{\pi} \simeq$ 280  MeV. The phase shifts are analyzed employing two approaches: effective range expansion and Lippmann-Schwinger equation derived in the effective field theory. In the latter case, the results imply an attraction at short range parametrized by contact terms and a slight repulsion at long range mediated by one-pion exchange with $m_{\pi} > m_{D^*}-m_D$. The poles in the amplitude across the complex energy plane are extracted and their trajectories are discussed as the charm quark mass is varied. Two complex conjugate poles corresponding to a resonance below threshold are found for $m_c$ close to the physical value. They turn into a pair of virtual states at the largest $m_c$ studied. With further increasing $m_c$, one virtual pole representing $T_{cc}^+$ is expected to move towards the two-body threshold and turn into a bound state. The light-quark mass dependence of the $T_{cc}^+$ pole is briefly discussed using the data on $DD^*$ scattering from other lattice collaborations.

• 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
• Različica publikacije: Objavljena publikacija
• Datum objave: 20.05.2024
• Leto izida: 2024
• Št. strani: Str. 094509-1-094509-18
• Številčenje: Vol. 109, iss. 9
• PID: 20.500.12556/RUL-156370
• UDK: 539.120.811
• ISSN pri članku: 2470-0010
• DOI: 10.1103/PhysRevD.109.094509
• COBISS.SI-ID: 196309763
• Datum objave v RUL: 22.05.2024

Gradivo je del revije

• Naslov: Physical review. D
• 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, mrežna kvantna kromodinamika