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Münster 2002 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 5: Electromagnetic and Hadronic Probes I

HK 5.4: Talk

Monday, March 11, 2002, 17:30–17:45, D

First results of π0−η mixing angle measurement — •P. Hawranek1, P. Hawranek1, H. Machner2, and H. Machner21Jagellonian University, Cracow, Poland — 2Institut für Kernphysik, Forschungszentrum Jülich, Jülich, Germany

Isospin symmetry may be broken - except for trivia reasons like Coulomb effects - via π0−η mixing. The mixing angle is related to the difference of the squared up and down quark masses. In order to measure this mixing angle we have studied the ratio of the two isospin related reactions pd3Heπ0 and pd3Hπ+ close to the η-threshold. A simple model Ref. 1 predicts the effect to be largest at large momentum transfer. The reactions have been measured at five different momenta in the vicinity of the η-threshold. Both recoils were measured simultaneously with an unusual magnetic spectrograph having two focal planes. The experiment will be presented as well as first data.

[1] A. Magiera and H. Machner, Nucl. Phys. A674 (2000) 515

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