Lattice QCD investigation of a doubly-bottom (b)over-bar(b)over-barud tetraquark with quantum numbers I(J(P))=0(1(+))

We use lattice QCD to investigate the spectrum of the (b) over bar(b) over bar ud four-quark system with quantum numbers I(J(P)) = 0(1(+)). We use five different gauge-link ensembles with 2 + 1 flavors of domain-wall fermions, including one at the physical pion mass, and treat the heavy (b) over bar quark within the framework of lattice nonrelativistic QCD. Our work improves upon previous similar computations by considering in addition to local four-quark interpolators also nonlocal two-meson interpolators and by performing a Luscher analysis to extrapolate our results to infinite volume. We obtain a binding energy of (-128 +/- 24 +/- 10) MeV, corresponding to the mass (10476 +/- 24 +/- 10) MeV, which confirms the existence of a (b) over bar(b) over bar ud tetraquark that is stable with respect to the strong and electromagnetic interactions.U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-AC05-06OR23177]; U.S. Department of Energy, Office of Science, Office of High Energy Physics [DE-SC0009913]; RHIC Physics Fellow Program of the RIKEN BNL Research Center; Heisenberg Programme of the DFG (German Research Foundation) [WA3000/3-1]; Helmholtz International Center for FAIR; State Ministry of Higher Education, Research and the Arts; U.S. Department of Energy Office of Science User Facility [DE-AC02-05CH11231]; National Science Foundation [ACI-1548562]Open access articleThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu