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HK: Fachverband Physik der Hadronen und Kerne

HK 65: Hadronenstruktur und -spektroskopie

HK 65.2: Vortrag

Donnerstag, 7. März 2013, 14:30–14:45, HSZ-304

Four pion hadronic cross sections at BABAR — •Konrad Griessinger — Institut für Kernphysik, Mainz

One of the most significant deviations from the Standard Model (SM) in laboratory experiments can be observed when comparing the SM prediction and the direct measurement of g−2 of the muon. In order to increase the current significance (3.6 σ) to the level where evidence of this effect may be claimed or rejected, we need to improve upon the experimental input for the theoretical prediction. For this purpose the most pressing issue is the precision measurement of the four pion cross sections σ(e⁺ e⁻ → π⁺π⁻π⁺π⁻) and σ(e⁺ e⁻ → π⁺π⁻π⁰π⁰). The fully charged mode has recently been published by BABAR with unprecedented precision, and the semi-neutral mode is in preparation.