Hamburg 2016 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 52: CP-Verletzung im B-Meson-System
T 52.2: Vortrag
Dienstag, 1. März 2016, 17:00–17:15, VMP6 HS F
Sensibility Study of B → π0π0 for the Belle II Experiment — •Fernando Abudinen for the Belle II collaboration — Max-Planck-Institut für Physik, München
Within the Standard Model, the largest CP violation is expected in the decays of B-mesons. Because of the small branching fraction around 10−6 and the difficulty in reconstructing the B0 decay vertex using π0s, the measurement of the CP violation parameters for the channel B → π0π0 is a highly challenging task. So far, the analysis at B-factories consisted in the measurement of the branching fraction B and the direct CP violation parameter ACP. These have been used to determine φ2, one of the angles of the Unitarity Triangle, via the isospin analysis of the whole B → ππ system.
With an expected integrated luminosity of about 50 ab−1 at SuperKEKB and the capabilities of the new pixel vertex detector, the Belle II experiment will provide enough data to measure also the mixing-induced CP violation parameter SCP. For this measurement the reconstruction of either π0→ e+ e− γ or converted photons from π0→ γ γ is required. The obtained result would reduce the ambiguities in the φ2 measurement.
Within the scope of this work the reconstruction of π0s and converted photons is being developed in order to exploit maximally the new data set and to characterize the sensitivity of Belle II for this channel.