Partial Wave Analysis at BESIII

Abstract

The BESIII experiment in Beijing takes data in $τ$-charm domain since 2009. For the moment the world largest samples of $J/ψ$, $ψ(3686)$, $ψ(3770)$ and $ψ(4040)$ data have been collected. Hadron spectroscopy is a unique way to access QCD, which is one of the most important physics goals of BESIII. Experimental search of new forms of hadrons and subsequent investigation of their properties would provide validation of and valuable input to the quantitative understanding of QCD. The key to success lies in high levels of precision during the measurement and high statistics in the recorded data set complemented with sophisticated analysis methods. Partial wave analysis (PWA) is a powerful tool to study the hadron spectroscopy, that allows one to extract the resonance's spin-parity, mass, width and decay properties with high sensitivity and accuracy. In this poster, we present the working PWA framework of BESIII -- GPUPWA and the recent results of PWA of $J/ψ\toγηη$. GPUPWA is a PWA framework for high statistics partial wave analyses harnessing the GPU parallel computing.