Speaker
Description
We present a determination of the spectrum of excited and exotic bottomonium using lattice QCD. Using a large basis of single-meson operators many highly excited states are identified. These include states which can be grouped into supermultiplets matching quark model expectations and additional states with exotic spin–parity–charge-conjugation quantum numbers $J^{PC}= 0^{+−}, 1^{−+}, 2^{+−}$ that cannot be formed from $q\bar{q}$ alone. States with a dominant gluonic component are identified and form a hybrid supermultiplet with $J^{PC}=(0,1,2)^{-+}, 1^{--}$ at approximately 1500 MeV above the lightest state in the system, in agreement with similar calculations in the light, heavy-light and charmonium systems.
Based upon material appearing in arXiv:2008.02656.
Sinéad M. Ryan and David J. Wilson,
for the Hadron Spectrum Collaboration
