Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 15: CP-Verletzung und Mischung

T 15.10: Talk

Monday, March 25, 2019, 18:20–18:35, S15

Determination of the resolution function of the B0 anti-B0 decay time difference — •Ketevan Parlagashvili, Vladimir Chekelian, Christian Kiesling, Luigi Li Gioi, and Hans-Günther Moser for the Belle 2 collaboration — Max-Planck-Institut für Physik, Munich, Germany

One of the goals of the Belle II experiment at SuperKEKB is the study of the CP asymmetries in the time evolution of the neutral B mesons. A clean laboratory to study the two-state system of B0 and anti-B0 mesons is provided by the Υ(4S) resonance which can be produced in e+ e- annihilation at the center of mass energy of 10.58 GeV. Belle II is equipped with an entirely new tracking system, in particular with a low material budget pixel vertex detector, only 14 mm away from the interaction region. In contrast to its predecessor KEKB, SuperKEKB is exhibiting a very small collision spot for the production of a B meson pair. This may have a strong impact on the analysis methods used so far for the determination of the decay time difference between a B meson in a chosen CP eigenstate and its flavor-determining companion. The goal is to determine the experimental resolution function of the distance (translated to the difference of the decay times) between the vertices of the two B mesons as a function of the different decay vertex qualities and vertex detector running conditions.