ϒ(nl) decay into B(⁎)B¯(⁎

Abstract

We have evaluated the decay modes of the Υ(4s), Υ(3d), Υ(5s), Υ(6s) states into BBsB * s using the 3 P0 model to hadronize the bb vector seed, fitting some parameters to the data. We observe that the Υ(4s) state has an abnormally large amount of meson-meson components in the wave function, while the other states are largely bb. We predict branching ratios for the different decay channels which can be contrasted with experiment for the case of the Υ(5s) state. While globally the agreement is fair, we call the attention to some disagreement that could be a warning for the existence of more elaborate components in the state.

Computation of the quarkonium and meson-meson composition of the ϒ(nS) states and of the new ϒ(10753Bicudo1, Cardoso2, Müller3 et al. 2021Phys. Rev. D

“…A possible interpretation is that these excited Υ states have large arXiv:2008.05605v1 [hep-lat] 12 Aug 2020 admixtures of B ( * ) B( * ) meson pairs [4][5][6]. Another scenario is that they do not correspond to the S wave states Υ(5S) and Υ(6S), but instead to the D wave states Υ(3D) and Υ(4D) [7][8][9]. The Belle experiment was, thus, designed to produce and study Υ states with a large B ( * ) B( * ) admixture.…”

Modern meson spectroscopy: the fundamental role of unitarity

“…This pattern can be understood by assuming an Υ(4S) resonance somewhat above the B s Bs threshold, which also allows to identify Υ(10860) as Υ(3D) and Υ(11020) as Υ(5S). From our phenomenological fit to the data, based on threshold enhancements as following from our production formalism described above, we extracted [140,141] an Υ resonance with a mass of 10.735 GeV and a σ(nb) As for our non-resonant interpretation of Υ(10580), also very recently Υ resonances above the openbottom threshold were studied [144] in a simple effective model based on the 3 P 0 mechanism. In this paper, the vector bottomonium resonances listed in the PDG tables are described via a propagator dressed with loops of B, B , B s , and B s mesons.…”

“…This condition is strongly fulfilled by all Υ resonances except for Υ(10580), which shows a large deviation. Moreover, the high peak and relatively large width of Υ(10580) is argued [144] to be incompatible with a vector b b resonance decaying only to B B and with little phase space. We believe that these results lend support to considering Υ(10580) a non-resonant B B threshold enhancement, amplified [140] by the pole of a so far unlisted (yet also see Ref.…”

$Υ$ and $η_b$ nuclear bound states

“…However, nearly no experiments have yet been aimed to produce the η c at lower energies and its binding to nuclei, perhaps hinting at the difficulty to produce and detect such states. In the case of bottomonium, studies were made for Υ photoproduction at the Electron-Ion Collider [39,40], Υ production in pPb collisions [41], and Υ(nl) (excited state) decay into B ( * ) B( * ) [42]. With studies like these on heavy quarkonium and future planned ones, we will improve our understanding of the strong force and strongly interacting matter.…”