Impact of colored scalars on $D^0-\bar D^0$ mixing in diquark models

Details Impact of colored scalars on $D^0-\bar D^0$ mixing in diquark models Impact of colored scalars on $D^0-\bar D^0$ mixing in diquark models

2009-02-16

arxiv.org/abs/0902.2620v3

Phys.Lett.B680:133-136,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 3 figures, references added, final version to appear PLB

Scientific paper

10.1016/j.physletb.2009.08.045

Inspired by the recent observation of the $D^0-\bar D^0$ mixing, we explore the effects of colored scalars on the $\Delta C=2$ process in diquark models. As an illustration, we investigate the diquarks with the quantum numbers of (6, 1, 1/3) and (6, 1, 4/3) under $SU(3)_C\times SU(2)_L\times U(1)_Y$ gauge symmetries, which contribute to the process at one-loop and tree levels, respectively. We show that $\Delta m_D$ gives the strongest constraint on the free parameters. In addition, we find that the small couplings can be naturally interpreted by the suppressed flavor mixings if the diquark of (6, 1, 4/3) only couples to the third generation.

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