Observation of $\eta'$ decays to $\pi^+\pi^-\pi^0$ and $\pi^+\pi^-\e^+e^-$

CLEO Collaboration: P. Naik; et al

Observation of η' decays to π^+π^-π⁰ and π^+π^-e^+e^-

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arxiv 0809.2587 v2 pith:7SBTRIND submitted 2008-09-15 hep-ex

Observation of η' decays to π^+π^-π⁰ and π^+π^-e^+e^-

CLEO Collaboration: P. Naik , et al This is my paper

classification hep-ex

keywords decaysbranchingfinalfractionsabsoluteacquiredcesrcleo-c

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Using psi(2S) --> pi+ pi- J/psi, J/psi --> gamma eta' events acquired with the CLEO-c detector at the CESR e+e- collider, we make the first observations of the decays eta' --> pi+ pi- pi0 and eta' --> pi+ pi- e+ e-, measuring absolute branching fractions (37 +11 -9 +- 4) x 10^-4 and (25 +12 -9 +- 5) x 10^-4, respectively. For eta' --> pi+ pi- pi0, this result probes the mechanism of isospin violation and the roles of pi0/eta/eta'-mixing and final state rescattering in strong decays. We also set upper limits on branching fractions for eta' decays to pi+ pi- mu+ mu-, 2(pi+ pi-), pi+ pi- 2pi0, 2(pi+ pi-)pi0, 3(pi+ pi-), and invisible final states.

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