Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-07-12
Phys.Lett.B683:302-305,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages, 2 figures; v4: Updated version to appear in Phys LettB; minor changes (including the title) & few refs. added
Scientific paper
10.1016/j.physletb.2009.12.048
We show that a fourth family of quarks with $m_{t'}$ in the range of (400 - 600) GeV provides a rather simple explanation for the several indications of new physics that have been observed involving CP asymmetries of the b-quark. The built-in hierarchy of the 4$\times$4 mixing matrix is such that the $t'$ readily provides a needed {\it perturbation} ($\approx 15%$) to $\sin 2 \beta$ as measured in $B \to \psi K_s$ and simultaneously is the dominant source of CP asymmetry in $B_s \to \psi \phi$. The correlation between CP asymmetries in $B_s \to\psi \phi$ and $B_d\to\phi K_s$ suggests $m_{t'} \approx$ (400 - 600) GeV. Such heavy masses point to the tantalizing possibility that the 4th family plays an important role in the electroweak symmetry breaking.
Alok Ashutosh Kumar
Giri Anjan
Mohanta Rukmani
Nandi Soumitra
Soni Amarjit
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