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Diquark properties from full QCD lattice simulations

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arxiv 2106.09080 v2 pith:SXWYLJ4Q submitted 2021-06-16 hep-lat hep-phnucl-th

Anthony Francis , Philippe de Forcrand , Randy Lewis , Kim Maltman This is my paper · ORCID
classification hep-lathep-phnucl-th
keywords diquarkgoodmassdifferencesdiquarkslatticequarkagreement
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We study diquarks on the lattice in the background of a static quark, in a gauge-invariant formalism with quark masses down to almost physical $m_\pi$. We determine mass differences between diquark channels as well as diquark-quark mass differences. The lightest and next-to-lightest diquarks have "good" scalar, $\bar{3}_F$, $\bar{3}_c$, $J^P=0^+$, and "bad" axial vector, $6_F$, $\bar{3}_c$, $J^P=1^+$, quantum numbers, and a bad-good mass difference for $ud$ flavors, $198(4)~\rm{MeV}$, in excellent agreement with phenomenological determinations. Quark-quark attraction is found only in the "good" diquark channel. We extract a corresponding diquark size of $\sim 0.6~\rm{fm}$ and perform a first exploration of the "good" diquark shape, which is shown to be spherical. Our results provide quantitative support for modeling the low-lying baryon spectrum using good light diquark effective degrees of freedom.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Chiral effective theory of scalar and vector diquarks revisited

    hep-ph 2024-11 conditional novelty 5.0 of 10

    A new term in the chiral diquark Lagrangian is shown to control the mass ordering of pseudoscalar diquarks and to set the threshold at which heavy-baryon decays turn off under chiral restoration.

  2. $X(3872)$ and hidden charmed tetraquarks

    hep-ph 2025-06 conditional novelty 4.0 of 10

    A diquark-antidiquark quark model with parameters fitted to X(3872) and Tcc predicts hidden-charm tetraquark masses and tentatively assigns XYZ states.

  3. Lattice perspectives on doubly heavy tetraquarks

    hep-lat 2025-02 accept novelty 1.0 of 10

    A review of lattice QCD results concludes that doubly heavy tetraquarks Tbb(ud/us) are firmly predicted as bound states, Tcc appears as a virtual state at nonphysical masses, and Tbc is under active study.

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