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

Abstract

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.

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

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Cited by in corpus (13)

• Forward-backward asymmetry of top quark in diquark models
• Forward-backward asymmetry in top quark production from light colored scalars in SO(10) model
• D-meson lifetimes within the heavy quark expansion
• Squarkonium, diquarkonium and octetonium at the LHC and their di-photon decays
• D-Dbar Mixing in the Standard Model and Beyond from Nf=2 Twisted Mass QCD
• Color Sextet Scalars in Early LHC Experiments
• CP violation in $D^0\to (K^{-}{K}^{+},{\pi }^{-}{\pi }^{+})$ from diquarks
• Single Top Production as a Probe of Heavy Resonances
• Colored Scalars And The CDF $W+$dijet Excess
• Threshold resummation for the production of a color sextet (antitriplet) scalar at the LHC
• Transverse momentum resummation for color sextet and antitriplet scalar production at the LHC
• Theory overview of charm physics
• Measuring Electroweak Quantum Numbers of Color Sextet Resonances at the LHC