Spectroscopy, leptonic decays and the nature of heavy quarkonia

Abstract

We examine the electronic width ratios of Upsilon resonances below the BBbar threshold by means of an effective (Cornell-type) QCD potential incorporating 1/m_b corrections obtained from a prior fit to the bottomonium spectrum. From our analysis we conclude that the Upsilon(2S) and Upsilon(3S) states should belong to the strong-coupling (nonperturbative) regime while the Upsilon(1S) state should belong to the weak-coupling (perturbative) regime, in agreement with a previous study based on radiative decays.

8 pages

References in corpus (9)

• Nonperturbative determination of the QCD potential at O(1/m)
• Probing NMSSM Scenarios with Minimal Fine-Tuning by Searching for Decays of the Upsilon to a Light CP-Odd Higgs Boson
• Potential-model calculation of an order-v^2 NRQCD matrix element
• Hunting a light CP-odd non-standard Higgs boson through its tauonic decay at a (Super) B factory
• Radiative quarkonium decays and the NMSSM Higgs interpretation of the HyperCP Sigma+ --> p mu+mu- events
• QQ-onia package: a numerical solution to the Schrodinger radial equation for heavy quarkonium
• Relativistic corrections to the static potential at O(1/m) and O(1/m^2)
• Proposal for testing lepton universality in Upsilon decays at a B-factory running at ${\rm Y}(3S)$
• Inclusive radiative decays of charmonium

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• Current Topics in Heavy Quarkonium Physics
• Investigation of spin-$0$ massive charged particle subject to a homogeneous magnetic field with potentials in a topologically trivial flat class of Gödel-type space-time