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Binding energy of the \\(T_bb\\) tetraquark from lattice QCD with relativistic and nonrelativistic heavy-quark actions
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Binding energy of the \\(T_bb\\) tetraquark from lattice QCD with relativistic and nonrelativistic heavy-quark actions
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Paper
Binding energy of the \\(T_bb\\) tetraquark from lattice QCD with relativistic and nonrelativistic heavy-quark actions
2026
Overview
We present a new determination of the \\( b b u d\\) (\\(J^P=1^+\\), \\(I=0\\)) tetraquark binding energy using lattice QCD with domain-wall light quarks and a nonperturbatively tuned three-parameter anisotropic-clover ``relativistic'' action for the \\(b\\) quarks. We also perform a direct comparison with a reanalysis of data generated in prior work using a lattice-NRQCD action for the \\(b\\) quarks and otherwise identical parameters. Using the new data with relativistic \\(b\\) quarks from seven different ensembles with multiple lattice spacings and pion masses, we perform combined chiral and continuum extrapolations and obtain \\((m_T_bb-m_B-m_B^*)_ RHQ=(-76 23)\\) MeV. For the NRQCD data from five ensembles, we perform chiral-only extrapolations and obtain \\((m_T_bb-m_B-m_B^*)_ NRQCD=(-74 17 10)\\) MeV. The lower magnitude of the results obtained here, compared to the original analysis in Phys. Rev. D 100, 014503 (2019), is due to the use of the symmetric parts of the correlation matrices with local four-quark operators only.
Publisher
Cornell University Library, arXiv.org
Subject
