Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 8: Hadronenstruktur und -spektroskopie
HK 8.1: Gruppenbericht
Montag, 19. März 2012, 16:30–17:00, RW 1
Hadron Spectroscopy with COMPASS — •Boris Grube — Physik-Department E18, Technische Universität München
COMPASS is a multi-purpose fixed-target experiment at the CERN Super Proton Synchrotron aimed at studying the structure and spectrum of hadrons. One primary goal is the search for new hadronic states, in particular exotic mesons and glueballs using hadron beams.
Its large acceptance, high resolution, and high-rate capability make the COMPASS experiment an excellent device to study the spectrum of light-quark mesons in diffractive and central production up to masses of about 2.5 GeV/c2. In addition COMPASS is able to measure final states with charged as well as neutral particles, so that resonances can be studied in different reactions and decay channels.
A significant spin-exotic JPC = 1−+ resonance consistent with the controversial π1(1600) was seen already in the 2004 pilot-run data in π−π+π− final states diffractively produced by a 190 GeV/c π− beam. During 2008 and 2009 COMPASS took a data sample about 100 times larger using negative and positive hadron beams on H2, Ni, and Pb targets. We will give an overview of the first results from this data set that cover a variety of channels. In particular the talk will focus on the search for spin-exotic mesons in diffractively produced 3π, η′π, and possibly 5π final states and the analysis of central-production reactions in order to study glueballs in the scalar sector.