Kink Finder at Belle II
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.
Keywords
Cite
@article{arxiv.2511.14171,
title = {Kink Finder at Belle II},
author = {Denis Bodrov and Xinping Xu and Dmitrii Gavrilov and Pavel Pakhlov and Valerio Bertacchi and Tadeas Bilka and Arkodip Biswas and Giulia Casarosa and Priyanka Cheema and Luigi Corona and Giacomo De Pietro and Thanh V. Dong and Patrick Ecker and Torben Ferber and Romulus Godang and Alexander Heidelbach and Tommy Lam and Martina Laurenza and Thomas Lueck and Ludovico Massaccesi and Frank Meier and Lea Reuter and Bianca Scavino and Karin Schoenning and Justin Skorupa and Stefano Spataro and Tien Manh Tran and Vidya Vobbilisetti and Christian Wessel and Jaroslaw Wiechczynski},
journal= {arXiv preprint arXiv:2511.14171},
year = {2026}
}
Comments
9 pages, 6 figures, published in Nuclear Instruments and Methods in Physics Research Section A