Challenging the Standard Model with the scrutiny of b to qll transitions

Project Information

Chiaroscuro

Grant agreement ID: 101018181

DOI

10.3030/101018181

EC signature date 8 July 2021

Start date 1 October 2021

End date 30 September 2028

Funded under

• EXCELLENT SCIENCE - European Research Council (ERC)

Total cost

€ 2 221 993,00

EU contribution

€ 2 221 993,00

Coordinated by

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS
France

Periodic Reporting for period 2 - Chiaroscuro (Challenging the Standard Model with the scrutiny of b to qll transitions)

Reporting period: 2023-04-01 to 2024-09-30

Summary of the context and overall objectives of the project

The Chiaroscuro project is probing the potential existence of elementary particles beyond those currently known from the Standard Model of Particle Physics.
During its first 30 months, despite external challenges such as the COVID-19 pandemic and the war in Ukraine, the project progresses well using the data already recorded by the LHCb experiment at CERN. Indeed, due to the delay in the recording of physics quality data with the upgraded LHCb detector, the project extracts as much as possible the full information from the previously recorded data. In parallel, the understanding of the new data is on-going.

Work performed from the beginning of the project to the end of the period covered by the report and main results achieved so far

We have performed detailled studies on b→see transitions in particuler for the Bs -> Phi ee decay mode and the B0 -> K*0 ee decay mode

Progress beyond the state of the art and expected potential impact (including the socio-economic impact and the wider societal implications of the project so far)

We have performed detailed studies on b→see transitions which are of great interest because their comparison may help to shade light on tensions seen in transitions b→s mu mu transitions which are already well studied, contrary to modes involving electrons.

One of the billions of events recorded by the LHCb experiment.