Karlsruhe 2011 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 61: Halbleiterdetektoren I
T 61.3: Vortrag
Montag, 28. März 2011, 17:15–17:30, 30.21: 001
QED Background at Belle Experiment — •Elena Nedelkovska — Max-Planck-Institut für Physik, München, Deutschland
The current KEKB accelerator will be upgraded to SuperKEKB, with a design luminosity of 0.8 × 1036 cm−2s−1. The current Belle detector will also be upgraded to Belle II, containing an entirely new part, a pixel vertex detector (PXD). The PXD will be placed close to the beam pipe and has to handle a harsh background environment. An important background may come from QED processes, such as γγ → e+e− with very low energy electrons and positrons emitted, reaching mostly the inner layers of the Belle II Si system. Such processes could not be measured so far. In order to determine whether the QED processes might be a dominant source of luminosity-related background, three dedicated experiments were performed at KEK. The results of these experiments will be discussed, as well as their relevance to the PXD.