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Article overview
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Tetraquark systems $ar bbar du$ in static limit and lattice QCD | | Mitja Sadl
; Sasa Prelovsek
; | | Date: |
17 Sep 2021 | | Abstract: | Two hadrons with exotic quark content $Z_b^+simeq ar bbar du$ were
discovered by Belle. We present a lattice study of the $ar bbar du$ systems
with various quantum numbers using static bottom quarks. Only one set of
quantum numbers that couples to $Z_b$ and $Upsilonpi$ was explored on the
lattice before: these studies found an attractive potential between $B$ and
$ar B^*$ resulting in a bound state below the threshold. The present study
considers the other three sets of quantum numbers. Eigen-energies of the $ar
bb ar du$ system are extracted as a function of separation between $b$ and
$ar b$. The resulting eigen-energies do not show any sizable deviation from
non-interacting energies of the systems $ar bb+ar du$ and $ar bu+ar
db$, so no significant attraction or repulsion is found. A slight exception is
a small attraction between $B$ and $ar B^*$ at small distance for the quantum
number that couples to $Z_b$ and $eta_b
ho$. | | Source: | arXiv, 2109.08560 | | Services: | Forum | Review | PDF | Favorites | |
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