Speaker
Boris Grube
(Excellence Cluster Universe, Technische Universität München)
Description
COMPASS is a multi-purpose fixed-target experiment at the CERN Super
Proton Synchrotron investigating the structure and spectrum of
hadrons. One primary goal is the search for new hadronic states, in
particular spin-exotic mesons and glueballs. Its large acceptance,
high resolution, and high-rate capability make the COMPASS experiment
an excellent device to study the spectrum of light mesons in
diffractive and central production up to masses of about
2.5~GeV$/c^2$. In addition COMPASS is able to measure final states
with charged as well as neutral particles, so that resonances can be
studied in many different reactions and decay channels.
After a short pilot run in 2004 with a 190~GeV$/c$ $\pi^-$~beam on a
Pb~target, which showed a significant spin-exotic $J^{PC} = 1^{-+}$
resonance around 1660~MeV$/c^2$, COMPASS collected large data
samples with negative and positive hadron beams on a liquid hydrogen
target in 2008 and 2009.
We will give an overview of the results from the pilot-run data and
present the status of various ongoing analyses of the 2008/9 data.
Primary author
Boris Grube
(Excellence Cluster Universe, Technische Universität München)
