We compute the supersymmetry (SUSY) effective Hamiltonian that describes the |ΔS|=1 semileptonic ... more We compute the supersymmetry (SUSY) effective Hamiltonian that describes the |ΔS|=1 semileptonic decays of tau leptons. We provide analytical expressions for supersymmetric contribution to τ→us¯ντ transition in mass insertion approximation. We show that SUSY contributions may enhance the CP asymmetry of τ→Kπντ decays by several orders of magnitude with respect to the standard model expectations. However, the resulting asymmetry is still well below the current experimental limits obtained by CLEO Collaborations. We emphasize that measuring CP rate asymmetry in this decay larger than 10-6 would be a clear evidence of physics beyond the supersymmetric extensions of the standard model.
We analyze the CP violation in the semileptonic |DeltaS|=1 tau decays in supersymmetric extension... more We analyze the CP violation in the semileptonic |DeltaS|=1 tau decays in supersymmetric extensions of the standard model with R parity violating term. We show that the CP asymmetry of tau decay is enhanced significantly and the current experimental limits obtained by CLEO collaborations can be easily accommodated. We argue that observing CP violation in semileptonic tau decay would be a clear evidence for R parity violating supersymmetry extension of the standard model.
We analyze the CP violation in the semileptonic | \Delta S|=1 tau-decays in supersymmetric extens... more We analyze the CP violation in the semileptonic | \Delta S|=1 tau-decays in supersymmetric extensions of the standard model (SM) with R parity violating term. We show that the CP asymmetry of tau-decay is enhanced significantly and the current experimental limits obtained by CLEO collaborations can be easily accommodated. We argue that observing CP violation in semi leptonic tau-decay would be a clear evidence for R-parity violating SUSY extension of the SM.
A non-universal axigluon in generalized chiral color models leads to flavor changing neutral curr... more A non-universal axigluon in generalized chiral color models leads to flavor changing neutral currents (FCNCs) at tree level. We analyze phenomenologically the new contributions to $B_{q}$ (q=d, s) mixing and the related CP asymmetries (CPAs) that are generated by axigluon exchange. We find that although $\Delta m_{B_q}$ can give a strict constraint on the parameters of $b\to q$ transition, the precise measurement of $\sin2\beta_{J/\Psi K^0}$ can further exclude the parameter space of $b\to d$ transition. The axigluon-mediated effects can enhance the like-sign dimuon charge asymmetry ${\cal A}^{b}_{s\ell}$ by one order of magnitude larger than the standard model prediction. Accordingly, large CPA $\sin2\beta^{J/\Psi \phi}_s$ and CPA difference $\sin2\beta_{J\Psi K^0}-\sin2\beta_{\phi K^0}$ are achieved.
In this paper, we study the Cabibbo favored non-leptonic $D^0$ decays into $K^- \pi^+$ decays. Fi... more In this paper, we study the Cabibbo favored non-leptonic $D^0$ decays into $K^- \pi^+$ decays. First we show that, within the Standard Model, the corresponding CP asymmetry is strongly suppressed and out of the experimental range even taking into account the large strong phases coming from final state Interactions. We show also that although new physics models with extra sequential generation can enhance the CP asymmetry by few orders of magnitude however the resulting CP asymmetry is still far from experimental range. The most sensitive New Physics Models to this CP asymmetry comes from no-manifest Left-Right models where a CP asymmetry up to 10% can be reached and general two Higgs models extension of SM where a CP asymmetry of order $10^{-2}$ can be obtained without being in contradiction with the experimental constraints on these models.
We show that the scalar leptoquark Yukawa couplings generate a significant lepton flavour violati... more We show that the scalar leptoquark Yukawa couplings generate a significant lepton flavour violation. We compute the light scalar leptoquark contributions to the branching ratios (Br) of the lepton flavour violating (LFV) decays $\ell \to \ell_i \ell_j \bar{\ell}_j$ and $\ell \rightarrow \ell^{\prime} \gamma$ with (i,j = e,$\mu$). We discuss the role of the relevant input parameters to these decay rates
We compute the supersymmetry (SUSY) effective Hamiltonian that describes the |ΔS|=1 semileptonic ... more We compute the supersymmetry (SUSY) effective Hamiltonian that describes the |ΔS|=1 semileptonic decays of tau leptons. We provide analytical expressions for supersymmetric contribution to τ→us¯ντ transition in mass insertion approximation. We show that SUSY contributions may enhance the CP asymmetry of τ→Kπντ decays by several orders of magnitude with respect to the standard model expectations. However, the resulting asymmetry is still well below the current experimental limits obtained by CLEO Collaborations. We emphasize that measuring CP rate asymmetry in this decay larger than 10-6 would be a clear evidence of physics beyond the supersymmetric extensions of the standard model.
We analyze the CP violation in the semileptonic |DeltaS|=1 tau decays in supersymmetric extension... more We analyze the CP violation in the semileptonic |DeltaS|=1 tau decays in supersymmetric extensions of the standard model with R parity violating term. We show that the CP asymmetry of tau decay is enhanced significantly and the current experimental limits obtained by CLEO collaborations can be easily accommodated. We argue that observing CP violation in semileptonic tau decay would be a clear evidence for R parity violating supersymmetry extension of the standard model.
We analyze the CP violation in the semileptonic | \Delta S|=1 tau-decays in supersymmetric extens... more We analyze the CP violation in the semileptonic | \Delta S|=1 tau-decays in supersymmetric extensions of the standard model (SM) with R parity violating term. We show that the CP asymmetry of tau-decay is enhanced significantly and the current experimental limits obtained by CLEO collaborations can be easily accommodated. We argue that observing CP violation in semi leptonic tau-decay would be a clear evidence for R-parity violating SUSY extension of the SM.
A non-universal axigluon in generalized chiral color models leads to flavor changing neutral curr... more A non-universal axigluon in generalized chiral color models leads to flavor changing neutral currents (FCNCs) at tree level. We analyze phenomenologically the new contributions to $B_{q}$ (q=d, s) mixing and the related CP asymmetries (CPAs) that are generated by axigluon exchange. We find that although $\Delta m_{B_q}$ can give a strict constraint on the parameters of $b\to q$ transition, the precise measurement of $\sin2\beta_{J/\Psi K^0}$ can further exclude the parameter space of $b\to d$ transition. The axigluon-mediated effects can enhance the like-sign dimuon charge asymmetry ${\cal A}^{b}_{s\ell}$ by one order of magnitude larger than the standard model prediction. Accordingly, large CPA $\sin2\beta^{J/\Psi \phi}_s$ and CPA difference $\sin2\beta_{J\Psi K^0}-\sin2\beta_{\phi K^0}$ are achieved.
In this paper, we study the Cabibbo favored non-leptonic $D^0$ decays into $K^- \pi^+$ decays. Fi... more In this paper, we study the Cabibbo favored non-leptonic $D^0$ decays into $K^- \pi^+$ decays. First we show that, within the Standard Model, the corresponding CP asymmetry is strongly suppressed and out of the experimental range even taking into account the large strong phases coming from final state Interactions. We show also that although new physics models with extra sequential generation can enhance the CP asymmetry by few orders of magnitude however the resulting CP asymmetry is still far from experimental range. The most sensitive New Physics Models to this CP asymmetry comes from no-manifest Left-Right models where a CP asymmetry up to 10% can be reached and general two Higgs models extension of SM where a CP asymmetry of order $10^{-2}$ can be obtained without being in contradiction with the experimental constraints on these models.
We show that the scalar leptoquark Yukawa couplings generate a significant lepton flavour violati... more We show that the scalar leptoquark Yukawa couplings generate a significant lepton flavour violation. We compute the light scalar leptoquark contributions to the branching ratios (Br) of the lepton flavour violating (LFV) decays $\ell \to \ell_i \ell_j \bar{\ell}_j$ and $\ell \rightarrow \ell^{\prime} \gamma$ with (i,j = e,$\mu$). We discuss the role of the relevant input parameters to these decay rates
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