Impact of colored scalars on D0 - over(D, ̄)0 mixing in diquark models

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Abstract

Inspired by the recent observation of the D0 - over(D, ̄)0 mixing, we explore the effects of colored scalars on the Δ 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 × SU (2)L × U (1)Y gauge symmetries, which contribute to the process at one-loop and tree levels, respectively. We show that Δ mD 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.

Original languageEnglish
Pages (from-to)133-136
Number of pages4
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume680
Issue number2
DOIs
Publication statusPublished - 2009 Sep 21

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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