The Belle-II Pixel Vertex Detector at the SuperKEKB Flavor Factory

TL;DR

The paper discusses the design and upgrade of the Belle-II pixel vertex detector at SuperKEKB, aiming to enhance decay vertex resolution for precision flavor physics measurements at a high-luminosity collider.

Contribution

It introduces a new silicon pixel vertex tracker with DEPFET sensors, improving vertex resolution in the upgraded Belle-II detector.

Findings

Design of a two-layer pixel detector with DEPFET sensors

Expected significant improvement in decay vertex resolution

Preparation for high-luminosity operation at SuperKEKB

Abstract

An upgraded asymmetric e+e- flavor factory, SuperKEKB, is planned at KEK. It will deliver a luminosity of 8 x 10^35 cm^-2 s^-1, allowing precision measurements in the flavor sector which can probe new physics well beyond the scales accessible to direct observation. The increased luminosity also requires upgrades of the Belle detector. Of critical importance here is a new silicon pixel vertex tracker, which will significantly improve the decay vertex resolution. This new detector will consist of two detector layers close to the interaction point, using DEPFET pixel sensors with 50 um thick silicon in the active area.