Journal
PHYSICAL REVIEW LETTERS
Volume 129, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.129.032002
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- Slovenian Research Agency ARRS [P1-0035]
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This study investigates the doubly charm tetraquark with flavor ccud and isospin I = 0 by calculating the DD* scattering amplitude using lattice QCD. The results show the existence of a virtual bound state pole that is likely related to the doubly charm tetraquark discovered by LHCb.
The doubly charm tetraquark with flavor ccud and isospin I = 0 is investigated by calculating the DD* scattering amplitude with lattice QCD. The simulation is done on CLS ensembles with dynamical u/d,s quarks and m(pi) similar or equal to 280 MeV for two charm quark masses, one slightly larger and one slightly lower than the physical value. The scattering amplitudes for partial waves l = 0, 1 are extracted near threshold via the Luscher method by considering systems with total momenta PL/(2 pi) =0,1, root 2,2 on two spatial volumes. A virtual bound state pole in the DD* scattering amplitude with l = 0 is found 9.9 (+3.6)(-7.1) MeV below the DD* threshold for the charm quark mass closer to the physical value. This pole is likely related to the doubly charm tetraquark discovered by LHCb less than 1 MeV below the (DD*+)-D-0 threshold. Future lattice simulations closer to the continuum limit and physical quark masses would be valuable to establish this connection systematically.
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