# International Workshop on Partial Wave Analyses and Advanced Tools for Hadron Spectroscopy

Mar 13 – 17, 2017
Europe/Zurich timezone

## First results from freed-isobar analysis with extended wave-sets

Mar 16, 2017, 5:00 PM
30m

### Lecture Hall

Topic 1: Spectroscopy of Baryons, Light- and Heavy-Quark Mesons

### Speaker

Mr Fabian Michael Krinner (Technische Universitaet Muenchen (DE))

### Description

The COMPASS experiment has collected a very large data set of 50 million
diffractively produced $\pi^-\pi^+\pi^-$ events using a $190\,$GeV$/c$
extensive Partial-Wave Analysis (PWA) of this data, we recently
published first results of a so-called freed-isobar PWA. In this
approach, fixed parametrizations of intermediate $\pi^+\pi^-$ resonances
are replaced by piecewise constant functions, which leads to a less
biased extraction of two- and three-particle amplitudes. The success of
this first analysis, which was limited to 3 partial waves with $J^{PC} = 0^{++}$ of the two-pion subsystem, led to an extension of the method to
include also waves with $J^{PC} = 1^{--}$ and \$2^{++} two-pion
subsystems. First results from Monte Carlo studies will be presented. We
will also discuss the ambiguities that arise in these extended
free-isobar PWAs and will show how to resolve them.

### Primary author

Mr Fabian Michael Krinner (Technische Universitaet Muenchen (DE))