XVIth Quark Confinement and the Hadron Spectrum

Doubly charmed tetraquark Tcc from lattice QCD

22 Aug 2024, 11:20

20m

Plenary 2

Oral C: Heavy Quarks Heavy Quarks

Speaker

Yan Lyu

Description

The doubly charmed tetraquark $T_{cc}^{+}$ recently discovered by the LHCb Coll. is studied by using (2+1)-flavor lattice QCD simulations with nearly physical pion mass $m_{\pi }=146$ MeV. The interaction between $D^{\ast }$ and $D$ in the isoscalar and $S$-wave channel extracted from the hadronic spacetime correlation by the HAL QCD method is attractive and leads to a near-threshold virtual state with a pole position $E_{\text{pole}}\simeq -59$ keV. The virtual state is shown to evolve into a loosely bound state as $m_{\pi }$ decreases to its physical value by using a potential modified to $m_{\pi }=135$ MeV based on the pion-exchange interaction. Such a potential is also able to describe the LHCb data on the $D^0{D}^0{\pi }^{+}$ mass spectrum.

Presentation materials

Yan Lyu_Tcc from LQCD_16th Confinement and Hadron Spectrum.pdf