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HK: Fachverband Physik der Hadronen und Kerne

HK 28: Hadron Structure and Spectroscopy 6

HK 28.3: Talk

Tuesday, March 24, 2015, 15:15–15:30, T/SR25

Electromagnetic transition form factor of the η meson with WASA-at-COSY — •Ankita Goswami for the WASA-at-COSY collaboration — Indian Institute of Technology Indore, Indore, India

The aim of this work is to measure the transition form factor of the η meson. The transition form factor describes the internal structure of a particle. The precise determination of the transition form factor of the η meson is possible through the η→γ e⁺ e⁻ Dalitz decay. When a particle is point-like then its decay rate can be calculated within QED. However, the complex structure of the particle modifies its decay rate. The transition form factor is determined by comparing the lepton-antilepton invariant mass distribution with QED. η mesons are produced using the reaction pp→ppη at a beam kinetic energy of 1.4MeV at the COSY accelerator of Forschungszentrum Jülich and decay particles of the η meson are detected with the WASA detector. In the higher invariant mass region recent theoretical calculations slightly deviate from the the data. With the high statistics dataset we expect precise results in the higher invariant mass region. The status of the analysis will be reported.

∗Supported by the FFE program of Forschungszentrum Jülich.