Erlangen 2026 – scientific programme
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T: Fachverband Teilchenphysik
T 26: Methods in Particle Physics II
T 26.4: Talk
Tuesday, March 17, 2026, 17:00–17:15, KH 00.020
Proof of Concept for a Brute-Force Alignment Approach for the CBM STS Detector — •Nora Bluhme1, Sergey Gorbunov2, and Volker Lindenstruth1,2 for the CBM collaboration — 1Goethe-University Frankfurt, Frankfurt am Main, Germany — 2GSI, Darmstadt, Germany
The Compressed Baryonic Matter experiment (CBM) at FAIR will study heavy-ion collisions at interaction rates of up to 107 events per second. For this purpose, accurate alignment of the detector systems is essential to exploit the high resolution of the sensors. This is typically achieved through track-based software alignment, which minimises a global χ2 over a set of high-quality tracks.
To complement existing alignment tools, we investigate a brute-force χ2 minimisation approach that can be applied with minimal analytical prerequisites. The method allows individual alignment parameters to be treated independently and enables the straightforward inclusion of various constraint types.
In this contribution, we present a proof-of-concept study demonstrating that this brute-force optimisation strategy is viable for the CBM Silicon Tracking System (STS) under idealised conditions. Using MC events with randomized sensor shifts and rotations, we evaluate the method’s ability to recover the imposed misalignments. We show that the approach converges stably across a range of test configurations and discuss its potential and limitations as a part of the alignment strategy within CBM.
This work is supported by BMFTR (05P24RF3).
Keywords: Alignment; CBM; Optimization