Göttingen 2012 – scientific programme

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T: Fachverband Teilchenphysik

T 70: Halbleiterdetektoren: Belle II

T 70.1: Group Report

Wednesday, February 29, 2012, 16:45–17:05, ZHG 005

The Belle II DEPFET pixel detector — •Carlos Marinas — Physikalisches Institut, Universitaet Bonn, Deutschland

The Japanese flavour factory (KEKB) accumulated a total integrated luminosity of 1000 fb⁻¹ over more than a decade of operation. Despite this great success, an upgrade of the existing machine is under construction, and is foreseen for commissioning by the end of 2015. This new electron-positron machine (SuperKEKB) will deliver an instantaneous luminosity 40 times higher than the world record set by KEKB.

To fully exploit the huge number of events and measure precisely the decay vertex of the B mesons in a large background environment, the SuperKEKB partner, the Belle detector, will be also upgraded. In the Belle II project, a highly granular silicon vertex detector (PXD) based on the DEPFET pixel technology, will be the innermost subsystem, operated very close to the interaction point. The new pixel detector has to have an excellent single point resolution (10 µm) and a fast readout (20 µs), while keeping the material budget under very low levels (0.2% X₀).

This talk summarizes the Belle II pixel detector concept, from the DEPFET sensor to the laboratory tests results, all the way up the electronics chain, the DAQ system and the cooling concept.