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Observation of η'→π+ π π+ π- and η'→π+π- π0 π0.

M Ablikim¹, M N Achasov², X C Ai¹

¹Institute of High Energy Physics, Beijing 100049, People's Republic of China.

Physical Review Letters

|July 12, 2014

Summary

This summary is machine-generated.

Researchers observed new decay modes for the eta prime meson (η′) using J/ψ events. This study provides the first measurements of these branching fractions, supporting theoretical predictions.

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Area of Science:

Particle Physics
Hadron Spectroscopy

Background:

The eta prime meson (η′) is a key particle in understanding light meson spectroscopy.
Previous studies have explored various decay modes of the η′ meson.

Purpose of the Study:

To report the first observation of two new decay channels for the η′ meson: η′→π⁺π⁻π⁺π⁻ and η′→π⁺π⁻π⁰π⁰.
To measure the branching fractions for these newly observed decay modes.

Main Methods:

Analysis of 1.3 × 10⁹ J/ψ events collected by the BESIII detector.
Event reconstruction and selection for the final states involving four pions.

Main Results:

Observed η′→π⁺π⁻π⁺π⁻ with a branching fraction of (8.53 ± 0.69(stat.) ± 0.64(syst.)) × 10⁻⁵.
Observed η′→π⁺π⁻π⁰π⁰ with a branching fraction of (1.82 ± 0.35(stat.) ± 0.18(syst.)) × 10⁻⁴.

Conclusions:

The measured branching fractions are consistent with theoretical predictions.
These results contribute to a better understanding of the η′ meson's properties and decay mechanisms, validating models combining chiral perturbation theory and vector-meson dominance.