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Study of the time-dependent CP asymmetry in D0 decays in the Belle II experiment

Abstract : We are studying the sensitivity of Belle II with 50 ab-1 data to the βc angle of the c-u unitarity triangle, with a time-dependent measurement of the CP asymmetry in the D0 decays. We show that such a measurement is still statistically limited, with a total expected incertitude of 3°. This measurement relies on the reconstruction of soft momenta, impacted by the SuperKEKB induced background. Two PLUME ladders will be used to study this background, therefore a study on the performances of PLUME was performed. The spatial resolution is of 1.8 µm and 3.5 µm for 0° and 36° tilted tracks respectivelly. We also propose to improve the estimation of soft momenta using the energy depositions of charged particles in the silicon layers of the inner tracker. Our estimator improves by approximately 2 % the resolution on momentum for particles which do not penetrate the central tracking system.
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Submitted on : Wednesday, January 13, 2016 - 11:31:48 AM
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  • HAL Id : tel-01255151, version 1

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Robert Maria. Study of the time-dependent CP asymmetry in D0 decays in the Belle II experiment . Physics [physics]. Universite de Strasbourg, 2015. English. ⟨tel-01255151⟩

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