Effects of Littlest Higgs model in rare D meson decays

Abstract

A tree-level flavor changing neutral current in the up-like quark sector appears in one of the variations of the Littlest Higgs model. We investigate the effects of this coupling in the D+ -> pi+ l+ l- and D0 -> rho0 l+ l- decays, which are the most appropriate candidates for the experimental studies. However, the effects are found to be too small to be observed in the current and the foreseen experimental facilities. These decays are still dominated by the standard model long-distance contributions, which are reevaluated based on the new experimental input.

arXiv comment13 pages, 3 figures; new constraint on scale f taken into account and effects on charm meson decays recalculated

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• Theoretical and experimental status of rare charm decays
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• $D\to \rho {\ell }^{+}{\ell }^{-}$ Decays in the QCD Factorization Approach
• Measurement of angular and CP asymmetries in $D^0\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ and $D^0\to K^{+}{K}^{-}{\mu }^{+}{\mu }^{-}$ decays
• First observation of the decay $D^0\to K^{-}{\pi }^{+}{\mu }^{+}{\mu }^{-}$ in the ${\rho }^0$-$\omega$ region of the dimuon mass spectrum
• Disentangling QCD and New Physics in $D^{+}\to {\pi }^{+}{\ell }^{+}{\ell }^{-}$
• Search for flavor-changing-neutral-current D meson decays
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• Searching for New Physics with Charm
• Observation of the decay $D^0\to K^{-}{\pi }^{+}{e}^{+}{e}^{-}$
• Angular analysis of $D^0\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ and $D^0\to K^{+}{K}^{-}{\mu }^{+}{\mu }^{-}$ decays and search for $CP$ violation
• Pinning down $|\Delta c|=|\Delta u|=1$ couplings with rare charm baryon decays
• Search for lepton-flavor violating decays $D^0\to X^0{e}^{\pm }{\mu }^{\mp }$
• Impact of $b\to s\ell \ell$ anomalies on rare charm decays in non-universal $Z^{\prime }$ models
• On the flavor structure of the littlest Higgs model
• Search for rare or forbidden decays of the $D^0$ meson
• $S$-wave contribution to rare $D^0\to {\pi }^{+}{\pi }^{-}{\ell }^{+}{\ell }^{-}$ decays in the Standard Model and sensitivity to New Physics
• Search for $D^0$ meson decays to ${\pi }^{+}{\pi }^{-}{e}^{+}{e}^{-}$ and $K^{+}{K}^{-}{e}^{+}{e}^{-}$ final states
• Weak radiative decay ${\Lambda }_c^{+}\to {\Sigma }^{+}\gamma$ using light-cone sum rules
• Search for resonance-enhanced $CP$ and angular asymmetries in the ${\Lambda }_c^{+}\to p{\mu }^{+}{\mu }^{-}$ decay at LHCb
• Prospects for discovering new physics in charm sector through low-energy scattering processes $e^{-}p\to e^{-}({\mu }^{-}){\Lambda }_c$
• A Guide to Flavour Changing Neutral Currents in the Littlest Higgs Model with T-Parity
• Implication of the HyperCP boson $X^0$ (214 MeV) in the flavour changing neutral current processes