Revealing new physics in Bs0→Ds∓ decays

Robert Fleischer, Eleftheria Malami*

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The Bs0→Ds∓K± system offers a determination of the Unitarity Triangle angle γ . Intrigued by an LHCb analysis showing a surprisingly large result in tension with information on the Unitarity Triangle and other γ measurements, we make a transparent study of the measured observables, confirming the LHCb picture. The corresponding γ puzzle at the 3 σ level would require CP-violating contributions of New Physics, which should also manifest themselves in the corresponding decay branching ratios. Indeed, we find that the rates of the individual Bs0→Ds∓K± channels show puzzling patterns, in accordance with similar decays, with tensions up to 4.8 σ , thereby making the situation much more exciting. We present a formalism to include New-Physics effects in a model-independent way and apply it to the data to constrain the corresponding parameters. Interestingly, new contributions of moderate size could accommodate the data. Utilising this formalism in the future high-precision B physics era may allow us to finally establish new sources of CP violation.

Original languageEnglish
Article number420
Pages (from-to)1-9
Number of pages9
JournalEuropean Physical Journal C
Volume83
Issue number5
Early online date19 May 2023
DOIs
Publication statusPublished - May 2023

Bibliographical note

Funding Information:
We would like to thank Ruben Jaarsma, Philine van Vliet and Kristof De Bruyn for useful discussions. This research has been supported by the Netherlands Organisation for Scientific Research (NWO).

Publisher Copyright:
© 2023, The Author(s).

Funding

We would like to thank Ruben Jaarsma, Philine van Vliet and Kristof De Bruyn for useful discussions. This research has been supported by the Netherlands Organisation for Scientific Research (NWO).

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