The hunt for New Physics in the Flavour Sector with up vector-like quarks

2012/07/31 by F. J. Botella, G. C. Branco, M. Nebot · 5 citations
Computer Science · Physics and Astronomy · #Asymmetry #Computational Physics and Python Applications #Flavour #Observable #Particle physics theoretical and experimental studies #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #Quark #Standard Model (mathematical formulation) #hep-ex #hep-ph

paper · pdf · doi:10.1007/jhep12(2012)040

36 pages, 41 figures; minor changes and references added, matches version accepted for publication

arxiv created 2012/11/19 · openalex publication_date 2012/12/01 · arxiv updated 2015/06/05 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We analyse the possible presence of New Physics (NP) in the Flavour Sector and evaluate its potential for solving the tension between the experimental values of \AJPKs and \BTNu with respect to the Standard Model (SM) expectations. Updated model independent analyses, where NP contributions are allowed in Bd - anti-Bd and Bs - anti-Bs transitions, suggest the need of New Physics in the bd sector. A detailed analysis of recent Flavour data is then presented in the framework of a simple extension of the SM, where a Q=2/3 vector-like isosinglet quark is added to the spectrum of the SM. Special emphasis is given to the implications of this model for correlations among various measurable quantities. We include constraints from all the relevant quark flavour sectors and give precise predictions for selected rare processes. We find important deviations from the SM in observables in the bd sector like the semileptonic asymmetry \asld, B_d⁰→ μ⁺μ^- and A^s_SL-A^d_SL. Other potential places where NP can show up include A_J/ΨΦ, γ, K_L⁰→ π⁰νν, t→ Zq and D⁰→ μ⁺μ^- among others. The experimental data favours in this model the existence of an up vector-like quark with a mass below 600(1000) GeV at 1(2) σ.

Citations

• Implications of the Measurement of theBs0B¯s0Mass Difference
• Quarks and leptons beyond the third generation
• CP violation and limits on New Physics including recent measurements
• Unitarity triangles and the search for New Physics
• Probing new physics through B mixing: Status, benchmarks and prospects
• Effects of Superheavy Quarks and Leptons in Low-Energy Weak Processes KL-> Formula, K+-> + Formula and K0 Formula0
• Search for B_s⁰ → μ + μ − and B0 → μ + μ − decays
• CP-Violation in the Renormalizable Theory of Weak Interaction

Cited by

• Addressing the CKM unitarity problem with a vector-like up quark
• Flavor physics scenario for the 750 GeV diphoton anomaly
• Quark-lepton mass relation and CKM mixing in anA4extension of the minimal supersymmetric standard model
• On the correlations between flavour observables in minimal U(2)3 models
• Flavor violating top decays and flavor violating quark decays of the Higgs boson
• The anatomy of quark flavour observables in 331 models in the flavour precision era