Minimally flavored colored scalar in and the mass matrices constraints
Abstract
The presence of a colored scalar that is a weak doublet with fractional electric charges of  Q = 2 /3 and  Q = 5 /3 with mass below 1 TeV can provide an explanation of the observed branching ratios in decays. The required combination of scalar and tensor operators in the effective Hamiltonian for is generated through the tchannel exchange. We focus on a scenario with a minimal set of Yukawa couplings that can address a semitauonic puzzle and show that its resolution puts a nontrivial bound on the product of the scalar couplings to and . We also derive additional constraints posed by , muon magnetic moment, lepton flavor violating decays μ → eγ, τ → μγ, τ → eγ, and τ electric dipole moment. The minimal set of Yukawa couplings is not only compatible with the mass generation in an SU(5) unification framework, a natural environment for colored scalars, but specifies all matter mixing parameters except for one angle in the uptype quark sector. We accordingly spell out predictions for the proton decay signatures through gauge boson exchange and show that p → π^{0} e ^{+} is suppressed with respect to and even p → K ^{0} e ^{+} in some parts of available parameter space. Impact of the colored scalar embedding in 45dimensional representation of SU(5) on lowenergy phenomenology is also presented. Finally, we make predictions for rare top and charm decays where presence of this scalar can be tested independently.
 Publication:

Journal of High Energy Physics
 Pub Date:
 November 2013
 DOI:
 10.1007/JHEP11(2013)084
 arXiv:
 arXiv:1306.6493
 Bibcode:
 2013JHEP...11..084D
 Keywords:

 Beyond Standard Model;
 BPhysics;
 High Energy Physics  Phenomenology;
 High Energy Physics  Experiment
 EPrint:
 30 pp, 6 figures