Study of tensor states in the reaction $\gamma\gamma \to \pi^+\pi^-\pi^0$

TL;DR

This study analyzes the reaction gammagamma pi^+pi^-pi^0 using high-statistics data from the Belle detector, revealing dominance of a specific tensor state and identifying several meson resonances.

Contribution

It provides a detailed spin-parity analysis of the three-pion final state, highlighting the dominance of the J^P=2^+ helicity 2 wave and identifying key resonances.

Findings

Dominance of J^P=2^+ helicity 2 wave in the mass range 1-3 GeV/c^2

Observation of _2(1320) and _2(1700) resonances

Detection of higher mass enhancements in the invariant mass distribution

Abstract

A high statistics study of the reaction $\gamma\gamma\to \pi^+\pi^-\pi^0$ has been performed with the Belle detector using a data sample of 26 fb$^{-1}$ collected at $\sqrt{s}=10.58\GeVcsq$. A spin-parity analysis shows dominance of the $J^P=2^+$ helicity 2 wave for three-pion invariant masses from 1 to 3 \GeVcsq. The invariant mass distribution exhibits $a_2(1320)$, $a_2(1700)$ and higher mass enhancements.