Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 38: Hadronenstruktur und -spektroskopie
HK 38.5: Vortrag
Donnerstag, 20. März 2014, 15:15–15:30, HZ 3
Study of the π+π− System in π−π+π− Final States at COMPASS — •Fabian Krinner — Physik-Department, Technische Universität München, Bayern.
COMPASS, located at CERN’s Super Proton Synchrotron, is a multi-purpose fixed-target experiment for studying the structure and spectrum of light hadrons using muon and hadron beams on various targets. With its high acceptance and resolution, it has e.g. collected the world’s biggest data set of diffractively produced π−π+π− final states. This large amount of data allows not only for a very detailed partial-wave analysis of this particular final state, but also for a novel type of analysis which extracts the π+π−-subsystem with the quantum numbers IG JPC = 0+ 0++ from the three-pion final state without any model input on its shape. This new study reveals correlations of the f0(980) with decays of the π(1800), the π2(1880) as well as a new state, the a1(1420), which will be presented.
Supported by BMBF, MLL and the Cluster of Excellence Exc153 “Origin and Structure of the Universe”