Speaker
Dr
Timothy Burns
(INFN Roma)
Description
The recent discovery of the bottomonia states h_b(1P) and h_b(2P)
confirms the expectations of constituent quark models, already verified in the charmonia sector, that the spin-spin splitting of P-wave mesons is very small. The striking agreement is somewhat surprising because the non-relativistic quark model prediction, for which the splitting is identically zero, may be modified due to large mass shifts from coupling to open flavour meson pairs. Remarkably, in most models the spin-spin splitting remains small despite what are in many cases large mass shifts. This effect is shown to be a generic feature of models in which the coupling is driven by the creation of a spin one pair.
Primary author
Dr
Timothy Burns
(INFN Roma)
