English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The COMPASS experiment at the CERN SPS investigates the structure andspectrum of hadrons by scattering high energetic hadrons and polarised muonsoff various fixed targets. During the years 2002-2007, COMPASS focused onnucleon spin physics using 160 GeV/c polarised $\mu^+$ beams on polariseddeuteron and proton targets, including measurements of the gluon contributionto the nucleon spin using longitudinal target polarisation as well as studiesof transverse spin effects in the nucleon on a transversely polarised target.One major goal of the physics programme using hadron beams is the search fornew states, in particular the search for $J^{PC}$ exotic states and glue-balls.COMPASS measures not only charged but also neutral final-state particles,allowing for investigation of new objects in different reactions and decaychannels. In addition COMPASS can measure low-energy QCD constants like, e.g.the electromagnetic polarisability of the pion. Apart from a few days pilot rundata taken in 2004 with a 190 GeV/c $\pi^{-}$ beam on a Pb target, showing asignificant spin-exotic $J^{PC}$ = $1^{-+}$ resonance at around 1660MeV/$c^{2}$, COMPASS collected high statistics with negative and positive 190GeV/$c$ hadron beams on a proton (H$_2$) and nuclear (Ni, Pb) targets in 2008and 2009. We give a selected overview of the newest results and discuss thestatus of various ongoing analyses.

Hadron Spectroscopy with COMPASS -- Newest Results