Erlangen 2001 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 16: Elektromagnetische und hadronische Proben III

HK 16.3: Vortrag

Dienstag, 20. März 2001, 15:00–15:15, C

Interaction of η Meson with Protons — •Paweł Moskal — Institute of Physics, Jagellonian University, ul. Reymonta 4, 30-059 Cracow, Poland

High statistics measurements of the pp→ ppη reaction at an excess energy of Q = 16 MeV have been performed at the internal facility COSY–11 installed at the cooler synchrotron COSY in Jülich. The measurement of four–momentum vectors for both outgoing protons of each registered event permits the full determination of all kinematical variables in the exit channel. The complete information of the η p p–system allows to study the η–proton interaction. The attractive interaction between η–proton and proton–proton pairs suggests that a quasi–bound state may be formed in this three body system. The formation probability of such systems depends on a still not well established value of the η–proton scattering length. The analysis of the data aims at determining both the real and imaginary part of this quantity. First results of the elaboration of 15000 events will be presented and compared to the similar measurement performed parallel at the TOF spectrometer at COSY.