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Alignment and calibration of Belle II tracking detectors

Not scheduled


1919-1 Tancha, Onna-son, Kunigami-gun Okinawa, Japan 904-0495
poster presentation Track2: Offline software


Mr Tadeas Bilka (Charles University in Prague)


The Belle II experiment will start taking data in 2017. The SuperKEKB accelerator will deliver a factor 40 higher luminosity in comparison to its predecessor, KEKB, to acquire a 50 times larger data sample of B-B̅ events. In order to manage higher occupancy and background, a new silicon vertex detector consisting of two inner layers of DEPFET pixel sensors surrounded by four layers of double-sided strip sensors will be installed. The high target performance of the detector, in particular vertex and momentum resolution, motivated the development of reliable alignment and calibration procedures. Combined with calibration of the upgraded drift chamber tracker, this task requires advanced software design and considerable computing resources. We present track-based alignment and calibration of the vertex and tracking detector using the global approach of the Millepede II tool in combination with an advanced track parametrization by the General Broken Lines (GBL) model. The procedure is implemented within the software framework of the Belle II experiment and GBL has also been integrated into the experiment-independent track-fitting toolkit GENFIT.

Primary author

Mr Tadeas Bilka (Charles University in Prague)


Claus Kleinwort (Deutsches Elektronen Synchrotron (DESY)) Peter Kvasnicka (Charles University (CZ)) Sergey Yaschenko (DESY) Zdenek Dolezal (Charles University (CZ))

Presentation materials