20.500.12556/RUL-156370 Toward the quark mass dependence of $T_{cc}^+$ from lattice QCD 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. physics of elementary particles lattice QCD fizika osnovnih delcev mrežna kvantna kromodinamika true false true Angleški jezik Slovenski jezik Članek v reviji 2024-05-22 14:49:47 2024-05-22 14:49:48 2024-05-23 03:49:20 0000-00-00 00:00:00 2024 0 0 Str. 094509-1-094509-18 iss. 9 Vol. 109 2024 0000-00-00 Zaloznikova NiDoloceno NiDoloceno 0000-00-00 0000-00-00 2024-05-20 539.120.811 2470-0010 10.1103/PhysRevD.109.094509 196309763 PhysRevD.109.094509.pdf PhysRevD.109.094509.pdf 1 D86E588AE4C31C538A605E9910D8E65B 1a88ec907df11fde32dda7346edab9a0a3f53f9ded90211a6ca5472d7bdbc7af 2397acd8-183b-11ef-b91f-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=183798 https://journals.aps.org/prd/abstract/10.1103/PhysRevD.109.094509 0 2bd2e5d9-183b-11ef-b91f-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=183799 Fakulteta za matematiko in fiziko 0 0 0