TY  - JOUR
AU  - Wieduwilt, P.
AU  - Paschen, B.
AU  - Schreeck, H.
AU  - Schwenker, B.
AU  - Soltau, J.
AU  - Ahlburg, P.
AU  - Dingfelder, J.
AU  - Frey, A.
AU  - Gomis, P.
AU  - Lutticke, F.
AU  - Marinas, C.
PY  - 2021
DA  - 2021//
TI  - Performance of production modules of the Belle II pixel detector in a high-energy particle beam
T2  - Nucl. Instrum. Methods Phys. Res. A
JO  - Nuclear Instruments & Methods in Physics Research A
SP  - 164978 - 15pp
VL  - 991
PB  - Elsevier
KW  - DEPFET
KW  - DESY testbeam
KW  - Pixel detector
KW  - Belle II
KW  - Vertex detector
AB  - The Belle II experiment at the Super B factory SuperKEKB, an asymmetric e(+) e(-) collider located in Tsukuba, Japan, is tailored to perform precision B physics measurements. The centre of mass energy of the collisions is equal to the rest mass of the gamma (4S) resonance of m(gamma(4S)) = 10.58 GeV. A high vertex resolution is essential for measuring the decay vertices of B mesons. Typical momenta of the decay products are ranging from a few tens of MeV to a few GeV and multiple scattering has a significant impact on the vertex resolution. The VerteX Detector (VXD) for Belle II is therefore designed to have as little material as possible inside the acceptance region. Especially the innermost two layers, populated by the PiXel Detector (PXD), have to be ultra-thin. The PXD is based on DEpleted P-channel Field Effect Transistors (DEPFETs) with a thickness of only 75 μm. Spatial resolution and hit efficiency of production detector modules were studied in beam tests performed at the DESY test beam facility. The spatial resolution was investigated as a function of the incidence angle and improvements due to charge sharing are demonstrated. The measured module performance is compatible with the requirements for Belle II.
SN  - 0168-9002
UR  - https://arxiv.org/abs/2101.10107
UR  - https://doi.org/10.1016/j.nima.2020.164978
DO  - 10.1016/j.nima.2020.164978
LA  - English
N1  - WOS:000686054900010
ID  - Wieduwilt_etal2021
ER  -