Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 79: Data Analysis, Information Technology and Artificial Intelligence 4
T 79.1: Vortrag
Mittwoch, 23. März 2022, 16:15–16:30, T-H38
KS0 tracking efficiency studies at Belle II — •Elisabetta Prencipe1, Oleksandr Skorenok2, and Jens Soeren Lange1 — 1JLU-Giessen, Giessen, Germany — 2TSNU-Kyiv, Kyiv, Ukraine
Reconstruction efficiency of low momentum tracks in particle physics is a very important issue. Here we report about a study conducted at Belle II, with MC samples and Phase-3 data, and present a dedicated study of the efficiency to correctly reconstruct KS0 → π+ π−, whose daughter tracks can have a different efficiency due to their displacement from the primary event origin.
A significant number of analyses in Belle II involve the reconstruction of KS0 → π+ π−. The reconstruction efficiency of the KS0 daughters depends on the KS0 transverse momentum, pT, polar angle, θLAB and transverse (XY) flight distance, dXY, which is computed as the distance between the primary vertex of the event and the refitted KS0 decay vertex.
The general strategy is to subdivide the data and MC events into a large number of samples by choosing an appropriate binning in these variables, determine the number of KS0 in each bin, in data and MC samples, and for each of the momentum and polar angle ranges, normalize the ratio of its value in the first bin in dXY, where all tracking effects are well understood. The results here presented are acquired by studying the B → K+ K− KS0 and B → π+ π− KS0 decay channels at Belle II. They will help in understanding systematic effects of analysis where KS0 are involved.