Iso-singlet Down Quark Mixing And CP Violation Experiments

Abstract

We confront the new physics models with extra iso-singlet down quarks in the new CP violation experimental era with $\sin (2\beta )$ and ${\epsilon }^{\prime }/\epsilon$ measurements, $K^{+}\to {\pi }^{+}\nu \bar{\nu }$ events, and $x_s$ limits. The closeness of the new experimental results to the standard model theory requires us to include full SM amplitudes in the analysis. In models allowing mixing to a new isosinglet down quark, as in E${}_6$, flavor changing neutral currents are induced that allow a $Z^0$ mediated contribution to $B-\bar{B}$ mixing and which bring in new phases. In $(\rho ,\eta )$, $(x_s,\sin (\gamma ))$, and $(x_s,\sin (2{\varphi }_s))$ plots we still find much larger regions in the four down quark model than in the SM, reaching down to $\eta \approx 0$, $0\le \sin (\gamma )\le 1$, $-.75\le \sin (2\alpha )\le 0.15$, and $\sin (2{\varphi }_s)$ down to zero, all at 1$\sigma$. We elucidate the nature of the cancellation in an order ${\lambda }^5$ four down quark mixing matrix element which satisfies the experiments and reduces the number of independent angles and phases. We also evaluate tests of unitarity for the $3\times 3$ CKM submatrix.

14 pages, 16 figures, REVTeX4

References in corpus (6)

• Observation of Large CP Violation in the Neutral B Meson System
• Observation of CP violation in the B^0 meson system
• Further Evidence for the Decay K+ to pi+ neutrino-antineutrino
• Constraining models with vector-like fermions from FCNC in K and B physics
• $K^{+}\to {\pi }^{+}\nu \bar{\nu }$: a rising star on the stage of flavour physics
• Tree-level FCNC in the B system: from CP asymmetries to rare decays

Cited by in corpus (15)

• Effects of mixing with quark singlets
• Waiting for Precise Measurements of K^+->pi^+ nu nu and K_L->pi^0 nu nu
• New-physics signals of a model with a vector-singlet up-type quark
• K+ -> pi+ nu nu(bar) and FCNC from non-universal Z' bosons
• Beautiful Mirrors at the LHC
• Constraints on New Physics from $K\to \pi \nu \bar{\nu }$
• Flavor signatures of isosinglet vector-like down quark model
• The size of chi = arg (-Vts Vtb* Vcs* Vcb) and physics beyond the Standard Model
• Yet Another Extension of the Standard Model: Oases in the Desert?
• Exotic Q=-1/3 Quark Signatures at High-Energy Hadron Colliders
• Flavor and CP violating Z exchange and the rate asymmetry in B --> phi K_S
• Unitarity Triangles and the Search for New Physics
• Flavor-changing interactions with singlet quarks and their implications for the LHC
• Quark mixing from softly broken symmetries
• Nondecoupling of Heavy Fermions and a Special Yukawa Texture