Time-dependent CP violation in b → s γ transitions at Belle II
Sumitted to PubDB: 2019-08-13
Category: Talk, Visibility: Public
Tags:
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Authors |
Olga Werbycka
|
Date |
2019-07-02 |
Belle II Number |
BELLE2-TALK-CONF-2019-091 |
Abstract |
Some physics scenarios beyond the Standard Model of particle physics restore right-handed weak currents, which would manifest themselves in the polarization of the photon produced in transitions. Due to the structure of the quark- coupling in the Standard Model, this polarization is strongly correlated with the flavour of the b-quark and suppresses interference responsible for time-dependent violation in decays. Observing sizable values of time-dependent asymmetries in these decays would therefore represent a null-test of the Standard Model. The Belle II experiment at the SuperKEKB energy-asymmetric collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. The design luminosity of the machine is cms and the Belle II experiment aims to record 50 ab of data, a factor of 50 more than its predecessor. From February to July 2018, the machine has completed a commissioning run, achieved a peak luminosity of cms, and Belle II has recorded a data sample of about 0.5 fb. Main operation of SuperKEKB has started in March 2019. In this presentation we show how the final Belle II data set will allow to evaluate the time-dependent asymmetries for the final states and 10^{-2}$. As a preparatory exercise, we describe the first measurement of the B-lifetime with the early Belle II data, which already allows to understand accurate modelling of the time resolution as an essential ingredient. |
Conference |
PASCOS 2019 |
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