Jun 5 – 9, 2023
Genova, Italy
Europe/Rome timezone

Computing polarimeter vector fields with symbolic amplitude models

Jun 7, 2023, 3:10 PM
DAD - Room 5L (Genova, Italy)

DAD - Room 5L

Genova, Italy

Invited Analysis tools Analysis tools


Mr Remco de Boer (Ruhr University Bochum)


Recently, the LHCb collaboration has computed the aligned polarimeter vector field for the dominant hadronic decay mode of the $\Lambda_c$ baryon (arXiv:2301.07010). The polarimeter vector field is a model-independent representation of the decay rate for polarized decays that can be used to measure polarisation and to improve the sensitivity of amplitude models.

The computations were performed with a new approach using methods from the ComPWA project. Amplitude models are implemented symbolically with a Computer Algebra System, so that the mathematics can be easily inspected. The symbolic model then serves as a template for fast, numerical back-ends like JAX and TensorFlow. This symbolic approach makes it easy to formulate and fit amplitude models in a self-documenting workflow with high performance on large, multidimensional data samples. In addition, the approach proved flexible enough to compute these more complicated polarimeter vector fields.

Primary author

Mr Remco de Boer (Ruhr University Bochum)


Prof. Miriam Fritsch (Ruhr University Bochum) Dr Stefan Pflüger (Ruhr University Bochum) Prof. Wolfgang Gradl (Johannes Gutenberg Universitat Mainz)

Presentation materials