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Setting Limits on Supersymmetry Using Simplified Models

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Precision Study of η^{'}→γπ^{+}π^{-} Decay Dynamics.

M Ablikim¹, M N Achasov², S Ahmed³

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

Physical Review Letters

|June 30, 2018

Summary

Researchers studied the eta-prime (η′) meson decay into gamma pi+ pi- using a large dataset. They observed new contributions from omega and rho-omega interference, advancing our understanding of particle physics.

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Area of Science:

Particle Physics
Hadron Spectroscopy
Quantum Chromodynamics (QCD)

Background:

The eta-prime (η′) meson is a key player in understanding light meson spectroscopy and QCD.
Previous studies of η′ → γπ⁺π⁻ decays lacked sufficient statistics to resolve detailed dynamics.
The BESIII detector at BEPCII provides unprecedented data for high-precision measurements.

Purpose of the Study:

To investigate the decay dynamics of η′ → γπ⁺π⁻ using a significantly larger dataset.
To identify and characterize contributions from various intermediate states and resonances.
To compare results from model-dependent and model-independent analyses.

Main Methods:

Analysis of 9.7 × 10⁵ J/ψ → γη′, η′ → γπ⁺π⁻ events collected by the BESIII detector.
Application of both model-dependent and model-independent approaches to study decay dynamics.
Statistical analysis to determine the significance of observed contributions.

Main Results:

The contributions of the ω meson and the ρ(770)-ω interference are observed for the first time in η′ → γπ⁺π⁻ decays.
A contribution from the 'box anomaly' or the ρ(1450) resonance is found to be necessary in the model-dependent analysis.
The process-specific part of the decay amplitude is determined in the model-independent approach.

Conclusions:

This study provides the most precise measurement to date of the η′ → γπ⁺π⁻ decay dynamics.
The observation of ω and ρ(770)-ω interference offers new insights into the decay mechanisms of the η′ meson.
The results necessitate further theoretical investigation into the role of the box anomaly or ρ(1450) resonance.