Journal Article

PUBDB-2023-07948

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png New physics in B$_{q}$ $^{0}$– mixing: present challenges, prospects, and implications for

De Bruyn, K. (Corresponding author) ; Fleischer, R. ; Malami, E. ; Vliet, P. J. v.Extern*DESY*

2023
IOP Publ. Bristol

This record in other databases:        

Please use a persistent id in citations: doi:10.1088/1361-6471/acab1d  doi:10.3204/PUBDB-2023-07948

Report No.: Nikhef-2022-012; arXiv:2208.14910

Abstract: The phenomenon of B$^{0}$ $_{q}$– mixing (q = d, s) provides a sensitive probe for physics beyond the Standard Model (SM). We explore the corresponding space for New Physics left through the current data, having a careful look at analyses of the Unitarity Triangle that are needed for the SM predictions of the B $_{q}$ mixing parameters. In particular, we explore the impact of tensions between inclusive and exclusive determinations of the CKM matrix elements ∣V $_{ub}$∣ and ∣V $_{cb}$∣. Moreover, we focus on the angle γ of the Unitarity Triangle, comparing measurements from B → DK and B → π π, ρ π, ρ ρ decays, where the latter are typically interpreted in terms of the angle α. We discuss various scenarios and present the corresponding state-of-the-art constraints on the New Physics parameters of B$_{q}$ $^{0}$– mixing. We point out that these results have an interesting application in the analysis of rare decays, allowing us to minimise the impact of CKM parameters in the search for New Physics. In view of the high-precision era, we make future projections. Interestingly, we find that for the extraction of the New Physics parameters in the B $_{d}$ system the determination of the apex of the Unitarity Triangle results in a key limiting factor. By contrast, the corresponding impact is negligible for the B $_{s}$ system, making it a promising candidate to reveal sources of New Physics.

Keyword(s): CKM matrix: unitarity ; new physics: search for ; mixing ; tension ; bottom meson: branching ratio ; bottom meson: decay ; B-meson mixing ; flavour physics ; new physics searches ; unitarity Triangle ; CKM parameters

Note: 45 pages, 14 figures and 6 tables. This version matches the published version

---

Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. DFG project 400570283 - Das Conformal Bootstrap Programm (400570283) (400570283)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2023

---

Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; National-Konsortium ; SCOPUS ; Web of Science Core Collection

---