Standard Model Predictions and New Physics Sensitivity in B->DD Decays

TL;DR

This paper performs a comprehensive, model-independent analysis of B->DD decays using SU(3) symmetry, identifying observables for testing the Standard Model and predicting unmeasured CP asymmetries and branching ratios.

Contribution

It introduces a symmetry-based framework that minimizes theoretical assumptions and includes symmetry-breaking corrections to analyze B->DD decays.

Findings

Predicted the branching ratio for B0->DsDs decay.

Identified experimentally accessible observables unaffected by symmetry-breaking.

Provided predictions for several unmeasured CP asymmetries.

Abstract

An extensive model-independent analysis of B->DD decays is carried out employing SU(3) flavour symmetry, including symmetry-breaking corrections. Several theoretically clean observables are identified which allow for testing the Standard Model. These include the known time-dependent CP asymmetries, the penguin pollution of which can be controlled in this framework, but notably also quasi-isospin relations which are experimentally well accessible and unaffected by symmetry-breaking corrections. Theoretical assumptions can be kept to a minimum and controlled by additional sum rules. Available data are used in global fits to predict the branching ratio for the B0->DsDs decay as well as several CP asymmetries which have not been measured so far, and future prospects are analyzed.