New results on the search for spin-exotic mesons with COMPASS
Frank Nerling (for the COMPASS Collaboration)

TL;DR
The paper reports new high-statistics results from the COMPASS experiment on the search for spin-exotic mesons, specifically the $ ext{π}_1(1600)$, using partial-wave analysis of decay channels, building on earlier signals observed in 2004.
Contribution
It presents new experimental results from 2008 data on the search for the $ ext{π}_1(1600)$ meson with exotic quantum numbers, advancing hadron spectroscopy.
Findings
Observation of a significant $J^{PC}$ spin-exotic signal in 2004 data.
New results from 2008 data on the $ ext{π}_1(1600)$ resonance.
Partial-wave analysis of $ ho ext{π}$ and $ ext{η'} ext{π}$ decay channels.
Abstract
The COMPASS fixed-target experiment at the CERN-SPS studies the structure and spectrum of hadrons. One important goal using hadron beams is the search for new states, in particular spin-exotic mesons and glueballs. As a first input to the puzzle, COMPASS observed a significant spin-exotic signal in the 2004 pilot run data (190\,GeV/ beam, Pb target) in three charged pion final states consistent with the disputed . We started our hadron spectroscopy programme in 2008 by collecting very high statistics using a 190 GeV/ negative pion beam scattered off a liquid hydrogen (proton) target. The current status and new results from the 2008 data on the search for the resonance with exotic quantum numbers obtained from partial-wave analyses of the and decay channels are presented.
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