Hamburg 2016 – scientific programme

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T: Fachverband Teilchenphysik

T 52: CP-Verletzung im B-Meson-System

T 52.2: Talk

Tuesday, March 1, 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 A_CP. 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 S_CP. 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.