Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 6: Hadronenstruktur und -spektroskopie

HK 6.6: Vortrag

Montag, 4. März 2013, 12:30–12:45, HSZ-304

Towards a measurement of the ωπ transition form factor — •Farha Anjum Khan — Forschungszentrum Juelich, Juelich, Germany

Experiments using the reaction pd→³He ω have been performed with the WASA detector at COSY to determine the transition form factor for the ω→π⁰e⁺e⁻→π⁰γ^* decay. For the study of the background contributions, an analysis of the real photon case ω→π⁰γ and the decay ω→π⁰π⁺π⁻ is being performed. Using selective conditions the multi-pion background has to be substantially reduced. The number of ω mesons is estimated and cross-checked with the branching ratio of π⁰γ relative to π⁰π⁺π⁻. Kinematic fitting is used to improve background suppression. The analysis for the ω→π⁰e⁺e⁻ decay is performed with the expectation of less than 40 ω→π⁰e⁺e⁻ events after reasonable suppression of the multi-pion background and subtraction of the in-peak contributions from other ω decays. As an initial step towards a form factor measurement the branching ratio for ω→π⁰e⁺e⁻ is estimated, providing a first hint at the size of the from factor.