nucl-th digest · Jan 4, 2023

The

Σ

and

Ξ

electromagnetic form factors in the extended vector meson dominance model

We propose a phenomenological extended vector meson dominance model for the baryon electromagnetic structure, and it is found that the current experimental data on the

Σ

and

Ξ

electromagnetic form factors in the time-like region can be well described. Meanwhile, we can also reproduce the ratios of the total cross sections of reactions

e^{+} e^{-} \to Σ^{+} Σ ˉ^{-}

Σ^{0} Σ ˉ^{0}

, and

Σ^{-} Σ ˉ^{+}

, which are

9.7 \pm 1.3 : 3.3 \pm 0.7 : 1

at center-of-mass energies from

2.3864

3.02

GeV. We also analytically continue the expression of the form factors to space-like region and estimate the charge radii of the

Σ

and

Ξ

hyperons. The result for the

Σ^{-}

is in agreement with the experimental date.

Comments:: 7 pages, 5 figures. Typos are fixed
Subjects:: High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:: 2301.00976 [pdf]

PRD(2023)·24 citations

[Submitted on 3 Jan 2023] (cross-list from hep-ph)

Bottomonium suppression in the quark-gluon plasma -- From effective field theories to non-unitary quantum evolution

Michael Strickland🇺🇸

In this proceedings contribution I review recent work which computes the suppression of bottomonium production in heavy-ion collisions using open quantum systems methods applied within the potential non-relativistic quantum chromodynamics (pNRQCD) effective field theory. I discuss how the computation of bottomonium suppression can be reduced to solving a Gorini-Kossakowski-Sudarshan-Lindblad (GKSL) quantum master equation for the evolution of the b-bbar reduced density matrix. The open quantum systems approach used allows one to take into account the non-equilibrium dynamics and decoherence of bottomonium in the quark-gluon plasma. Finally, I present comparisons of phenomenological predictions obtained using a recently obtained next-to-leading-order GKSL equation with ALICE, ATLAS, and CMS experimental data for bottomonium suppression and elliptic flow.

Comments:: 6 pages, 3 figures; Proceedings contribution to Excited QCD 2022, October 23-29 2022, Sicily, Italy
Subjects:: High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:: 2301.01031 [pdf]

Acta Phys.Polon.Supp.(2023)·0 citations

Wednesday·January 4, 2023

The $Σ$ and $Ξ$ electromagnetic form factors in the extended vector meson dominance model

Bottomonium suppression in the quark-gluon plasma -- From effective field theories to non-unitary quantum evolution

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