Study of the reaction pi- Be --> omega pi- pi0 Be

TL;DR

This study performs a partial wave analysis of the reaction pi- Be --> omega pi- pi0 Be at 37 GeV, revealing resonant structures, decay modes, and exotic quantum number states in the omega rho- system.

Contribution

It provides new measurements of decay branching ratios and reports the first observation of certain decay modes and exotic states in this reaction.

Findings

Resonant structure near 1.74 GeV with JpMetha=0-0+

First observation of pi2(1670)- and a4(2040)- decays to omega rho-

Detection of a bump with exotic quantum numbers Jpc=1-+ near 1.7 GeV

Abstract

The results of patial wave analysis of the omega pi- pi0 system, produced in the reaction pi- Be --> pi+ 2pi- 2pi0 Be at beam momentum of 37 GeV are presented. An indication of the resonant type structure with mass near 1.74 GeV and JpMetha=0-0+ in the omega rho- system was found. The decay branching ratio of a2(1320)- to omega pi- pi0 was measured. A wave with JpMetha=2+1+ shows a broad bump at M near 1.7 GeV. The decays pi2(1670)- --> omega rho- and a4(2040)- --> omega rho- were observed for the first time. The bump in the b1(1235)pi wave with exotic quantum numbers Jpc=1-+ at M near 1.7 GeV was observed.