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26 April 2024 |
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Production of loosely-bound hadron molecules from bottomonium decays | | Davide Marietti
; Alessandro Pilloni
; Umberto Tamponi
; | | Date: |
30 Aug 2022 | | Abstract: | We present multiple results on the production of loosely-bound molecules in
bottomonium annihilations and $e^+e^-$ collisions at $sqrt{s} = 10.58$ GeV. We
perform the first comprehensive test of several models for deuteron production
against all the existing data in this energy region. We fit the free parameters
of the models to reproduce the observed cross sections, and we predict the
deuteron spectrum and production and the cross section for the $e^+e^- o
dar{d} + X$ process both at the $Upsilon(1,2,3S)$ resonances and at
$sqrt{s}=10.58$ GeV. The predicted spectra show differences but are all
compatible with the uncertainties of the existing data. These differences could
be addressed if larger datasets are collected by the Belle~II experiment.
Fixing the source size parameter to reproduce the deuteron data, we then
predict the production rates for $H$ dibaryon and hypertriton in this energy
region using a simple coalescence model. Our prediction on $H$ dibaryon
production rate is below the limits set by the direct search at the Belle
experiment, but in the range accessible to the Belle~II experiment. The
systematic effect due to the MC modelling of quarks and gluon fragmentation
into baryons is reduced deriving a new tuning of the pythia MonteCarlo
generator using the available measurement of single- and double-particle
spectra in $Upsilon$ decays. | | Source: | arXiv, 2208.14185 | | Services: | Forum | Review | PDF | Favorites | |
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