Abstract
Measurement of the absolute branching fractions of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>γ</mml:mi><mml:mi>η</mml:mi></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>η</mml:mi></mml:math> decay modes
Highlights
the η and η0 mesons play an important part in understanding low energy quantum chromodynamics
η0 → γγ are related to the quark content of the two mesons
πþπ−γ decays are related to details of chiral dynamics
Summary
As two members of the ground-state nonet of pseudoscalar mesons, the η and η0 mesons play an important part in understanding low energy quantum chromodynamics (QCD) [1,2] Precise measurements of their branching fractions (BFs) are important for a wide variety of physics topics. The exclusive BFs of the η summarized by the Particle Data Group (PDG) [10] are all relative measurements This is due to the difficulty of tagging inclusive decays of the η. The most precise measurements so far are from the CLEO experiment [11], where the BFs were presented under the assumption that the five dominant decay modes measured in their work account for 99.9% of all η decays. With a much larger J=ψ sample, a similar but optimized method is used to tag inclusive decays of the η, and the absolute BFs of dominant η decay modes are measured for the first time
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