How sensitive to FCNC can $B^0$ CP asymmetries be?

Abstract

We show that the study of CP asymmetries in neutral B-meson decays provides a very sensitive probe of flavour-changing neutral currents (FCNC). We introduce two new angles, ${\alpha }_{SM}$ and ${\beta }_{SM}$, whose main feature is that they can be readily obtained from the measurement of the CP asymmetries $a_{J/\psi K_s}$, $a_{{\pi }^{+}{\pi }^{-}}$ and the ratio $R_u\equiv |V_{ud}{V}_{ub}^{\ast }|/|V_{cd}{V}_{cb}^{\ast }|$, providing a quantitative test of the presence of new physics in a model-independent way. Assuming that new physics is due to the presence of an isosinglet down-type quark, we indicate how to reconstruct the unitarity quadrangles and point out that the measurements of the above asymmetries, within the expected experimental errors, may detect FCNC effects, even for values of $|{\sum }_{i=1}^3{V}_{id}{V}_{ib}^{\ast }/(V_{td}{V}_{tb}^{\ast })|$ at the level of a few times $10^{-2}$.

19 pages including 9 figures

References in corpus (2)

• Quark mixing, CP violation and rare decays after the top quark discovery
• CP Violation Beyond the Standard Model

Cited by in corpus (36)

• Theory and phenomenology of two-Higgs-doublet models
• A handbook of vector-like quarks: mixing and single production
• Quarks and Leptons Beyond the Third Generation
• Effects of mixing with quark singlets
• Probing exotic phenomena at the interface of nuclear and particle physics with the electric dipole moments of diamagnetic atoms: A unique window to hadronic and semi-leptonic CP violation
• Constraints on top couplings in models with exotic quarks
• Minimal Flavour Violation and Multi-Higgs Models
• Unitarity triangles and geometrical description of CP violation with Majorana neutrinos
• Constraining models with vector-like fermions from FCNC in K and B physics
• New Physics and Evidence for a Complex CKM
• Addressing the CKM Unitarity Problem with a Vector-like Up Quark
• Lepton Flavor Violation in the Two Higgs Doublet Model type III
• Multilepton production via top flavour-changing neutral couplings at the CERN LHC
• Two-Higgs Leptonic Minimal Flavour Violation
• The Hunt for New Physics in the Flavour Sector with up vector-like quarks
• Phenomenology of lepton flavor violation in 2HDM(III) from (g-2)_mu and leptonic decays
• Tree-level FCNC in the B system: from CP asymmetries to rare decays
• Constraining Models of New Physics in Light of Recent Experimental Results on $a_{\psi K_S}$
• Bounds for Lepton Flavor Violation and the Pseudoscalar Higgs in the General Two Higgs Doublet Model using $g-2$ muon factor
• Z-mediated charge and CP asymmetries and FCNCs in $B_{d,s}$ processes
• Small violations of unitarity, the phase in Bs mixing and visible t->cZ decays at the LHC
• Constraining New Physics with the CDF Measurement of CP Violation in $B\to \psi K_S$
• Exotic Q=-1/3 Quark Signatures at High-Energy Hadron Colliders
• Vector-like Quarks at the Origin of Light Quark Masses and Mixing
• Unitarity Triangles and the Search for New Physics
• Building the full PMNS Matrix from six independent Majorana-type phases
• Non-unitarity of CKM matrix from the vector singlet quark mixing and neutron electric dipole moment
• Constraints on the quark mixing matrix with vector-like quarks
• Decays of the Heavy Top and New Insights on ${\epsilon }_K$ in a one-VLQ Minimal Solution to the CKM Unitarity Problem
• Universality of Strength of Yukawa Couplings, Quark Singlets and Strength of CP Violation
• Mixing asymmetries in B meson systems, the D0 like-sign dimuon asymmetry and generic New Physics
• The discrete charm of flavour and CP violation
• Flavour Physics and CP Violation in the Standard Model and Beyond
• Solving a Fine-Tuning Problem of the Standard Model through the Introduction of Vector-Like Quarks
• Nondecoupling of Heavy Fermions and a Special Yukawa Texture
• b Physics Beyond the Standard Model