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26 April 2024 |
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Article overview
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Diquark properties from full QCD lattice simulations | | Anthony Francis
; Philippe de Forcrand
; Randy Lewis
; Kim Maltman
; | | Date: |
16 Jun 2021 | | 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, $ar{3}_F$, $ar{3}_c$, $J^P=0^+$, and ’’bad’’ axial vector, $6_F$,
$ar{3}_c$, $J^P=1^+$, quantum numbers, and a bad-good mass difference for
$ud$ flavors, $198(4)~
m{MeV}$, in excellent agreement with phenomenological
determinations. Quark-quark attraction is found only in the ’’good’’ diquark
channel. We extract a corresponding diquark size of $sim 0.6~
m{fm}$ 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. | | Source: | arXiv, 2106.09080 | | Services: | Forum | Review | PDF | Favorites | |
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