Two-photon decay of a light scalar quark-antiquark state
Francesco Giacosa
TL;DR
This paper evaluates the two-photon decay of a light scalar quarkonium using local and nonlocal models, finding the decay width is less than 1 keV for masses below 0.7 GeV.
Contribution
It provides a comparative analysis of two-photon decay widths in local and nonlocal frameworks for light scalar quarkonium.
Findings
Decay width less than 1 keV for masses below 0.7 GeV
Decay driven by a triangle quark-loop diagram
Comparison between local and nonlocal approaches
Abstract
The two-photon decay of a light scalar quarkonium is evaluated in a local and a nonlocal approaches. It is shown that the two-photon decay, driven by a triangle quark-loop diagram, is smaller than 1 keV for a mass below 0.7 GeV.
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