Abstract
The decays and play a key role for the determination of the – (q = d, s) mixing phases ϕ d and ϕ s , respectively. The theoretical precision of the extraction of these quantities is limited by doubly Cabibbo-suppressed penguin topologies, which can be included through control channels by means of the SU(3) flavour symmetry of strong interactions. Using the currently available data and a new simultaneous analysis, we discuss the state-of-the-art picture of these effects and include them in the extracted ϕ q values. We have a critical look at the standard model predictions of these phases and explore the room left for new physics. Considering future scenarios for the high-precision era of flavour physics, we illustrate that we may obtain signals for physics beyond the standard model with a significance well above five standard deviations. We also determine effective colour-suppression factors of , and decays, which serve as benchmarks for QCD calculations of the underlying decay dynamics, and present a new method using information from semileptonic and decays.
Highlights
High precision measurements of the CP-violating phases φd and φs, which are associated with the phenomenon of B0q–B0q mixing of the neutral Bq mesons (q = d, s), are part of the core physics programmes at the large hadron collider (LHC) and the SuperKEKB accelerator, and will remain so for the decades
To minimise the theoretical uncertainties associated with the breaking of the SU(3)-symmetry relations between these modes, we primarily focus on the information from the CP asymmetries to determine the penguin contributions
Imagine a situation where we reduce the experimental uncertainty of the CP asymmetry measurements of B0d → J/ψK0 by a factor two, but no such improved measurements are yet available for the control modes B0d → J/ψπ0 and B0s → J/ψKS0
Summary
High precision measurements of the CP-violating phases φd and φs, which are associated with the phenomenon of B0q–B0q mixing of the neutral Bq mesons (q = d, s), are part of the core physics programmes at the large hadron collider (LHC) and the SuperKEKB accelerator, and will remain so for the decades. They offer excellent opportunities to search for evidence of new physics (NP) processes that are not accounted for by the standard model (SM) paradigm. For the SM predictions, this requires a critical look at the input observables used in the UT fit, which we will briefly discuss in section 2 below
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