Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 78: Fundamentale Symmetrien
HK 78.2: Gruppenbericht
Donnerstag, 7. März 2013, 17:15–17:45, HSZ-401
Status of the WITCH experiment — •Martin Breitenfeldt — IKS, Leuven, Belgien
In the field of fundamental interactions two main branches of experimental techniques are pursued: The precision and the high-energy experiments. Both branches are complementary, in the first one probes the effect new particles have on certain observables. In the case of the WITCH experiment the weak interaction in nuclear beta decay is probed by observing the recoil energy distribution of the daughter nuclei. Measuring this distribution to very high precision could reveal the presence of exotic (non standard -model) components in the weak interaction. For this exotic component the mediator could a charged Higgs boson, which might be discovered on the high-energy frontier. In the WITCH setup Penning trap technology is combined with a MAC-E type retardation spectrometer to allow for the measurement of the recoil energy. After several upgrades in the last years the WITCH experiment finished its commissioning phase. By acquiring several sets of data last year not only could first physics information be extracted, but it was also possible to further characterize the WITCH system and solve the last issues. With the run in November 2012 we were aiming for a first complete data set for 35Ar. In this talk preliminary results will be discussed together with the procedure to determine systematic uncertainties with the help of simulations.