SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 72: Exp. Methods II
T 72.1: Vortrag
Mittwoch, 22. März 2023, 15:50–16:05, POT/0106
Soft b-hadron vertex reconstruction tool — •Beatrice Cervato1, Binish Batool1, Markus Cristinziani1, Carmen Diez Pardos1, Ivor Fleck1, Arpan Ghosal1, Gabriel Gomes1, Jan Joachim Hahn1, Vadim Kostyukhin1, Buddhadeb Mondal1, Amartya Rej1, Katharina Voss1, Wolfgang Walkowiak1, and Tongbin Zhao1,2 — 1Center for Particle Physics Siegen, Experimentelle Teilchenphysik, Universität Siegen — 2Shandong University, China
Several interesting physical processes lead to the production of low-energy (soft) b-quarks in the final state, that may fragment into a b-hadron without the creation of a reconstructable jet. Moreover, sometimes b-hadrons in jets are so soft that their decay products are distributed over a wider angular range than the standard jet cone (the typical cone size is 0.4). The tool described in this contribution is targeting b-hadrons without jets and soft-b-hadrons inside jets, which are not detectable by standard Flavour Tagging Algorithms. For this reason, it is very important to develop and optimize such a b-tagging tool, as will be described in the presentation. After defining the efficiency and the fake rate, we estimate the tool performance using a tt reference sample, and define three working points. Subsequently, we check the tool performance at those working points using a sample with soft b-hadrons and a b-hadron-free sample. We demonstrate that the efficiency (fake rate) varies in a range that goes from 27% (0.5%) to 44% (7.1%).