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arXiv · 2511.14171

Kink Finder at Belle II

Denis Bodrov·Xinping Xu·Dmitrii Gavrilov·Pavel Pakhlov·Valerio Bertacchi·Tadeas Bilka·Arkodip Biswas·Giulia Casarosa·Priyanka Cheema·Luigi Corona·Giacomo De Pietro·Thanh V. Dong·Patrick Ecker·Torben Ferber·Romulus Godang·Alexander Heidelbach·Tommy Lam·Martina Laurenza·Thomas Lueck·Ludovico Massaccesi·Frank Meier·Lea Reuter·Bianca Scavino·Karin Schoenning·Justin Skorupa·Stefano Spataro·Tien Manh Tran·Vidya Vobbilisetti·Christian Wessel·Jaroslaw Wiechczynski
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Abstract

We present a track-finding algorithm for the Belle II experiment that specifically targets so-called kinks: signatures of charged particles decaying or scattering in-flight in the detector material, resulting in a sudden and significant change of the particle's flight direction. Our benchmark studies of this Kink Finder show that the reconstruction efficiency for such signatures is about 40%, compared to a value of around 11% for the standard Belle II track-finding algorithm. Our studies also show that the Kink Finder significantly improves the resolution of the secondary track parameters, suppresses the number of cloned tracks, and reduces the PID misidentification rates for kaon and pions.

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Denis Bodrov, Xinping Xu, Dmitrii Gavrilov, Pavel Pakhlov, Valerio Bertacchi, Tadeas Bilka, Arkodip Biswas, Giulia Casarosa, Priyanka Cheema, Luigi Corona, Giacomo De Pietro, Thanh V. Dong, Patrick Ecker, Torben Ferber, Romulus Godang, Alexander Heidelbach, Tommy Lam, Martina Laurenza, Thomas Lueck, Ludovico Massaccesi, Frank Meier, Lea Reuter, Bianca Scavino, Karin Schoenning, Justin Skorupa, Stefano Spataro, Tien Manh Tran, Vidya Vobbilisetti, Christian Wessel, Jaroslaw Wiechczynski. 2025-11-18. Kink Finder at Belle II. https://doi.org/10.1016/j.nima.2026.171438

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