Searching for New Physics in $D^0\to {\mu }^{+}{\mu }^{-},e^{+}{e}^{-},{\mu }^{\pm }{e}^{\mp }$ at BES and/or Super Charm-Tau Factory

Abstract

In contrast with $B^0-{\bar{B}}^0$, $B_s-{\bar{B}}_s$ mixing where the standard model (SM) contributions overwhelm that of new physics beyond standard model (BSM), a measured relatively large $D^0-{\bar{D}}^0$ mixing where the SM contribution is negligible, definitely implies the existence of new physics BSM. It is natural to consider that the rare decays of D meson might be more sensitive to new physics, and the rare decay $D^0\to {\mu }^{+}{\mu }^{-}$ could be an ideal area to search for new physics because it is a flavor changing process. In this work we look for a trace of new physics BSM in the leptonic decays of $D^0$, concretely we discuss the contributions of unparticle or an extra gauge boson $Z^{\prime }$ while imposing the constraints set by fitting the $D^0-{\bar{D}}^0$ mixing data. We find that the long-distance SM effects for $D^0\to l\bar{l}$ still exceed those contributions of the BSM under consideration, but for a double-flavor changing process such as $D^0\to {\mu }^{\pm }{e}^{\mp }$, the new physics contribution would be significant.

14 pages, 1 figure, 2 tables

References in corpus (18)

• Unparticle Physics
• Another Odd Thing About Unparticle Physics
• Measurement of the B(s) to mu+ mu- branching fraction and search for B0 to mu+ mu- with the CMS Experiment
• Measurement of the $B_s^0\to {\mu }^{+}{\mu }^{-}$ branching fraction and search for $B^0\to {\mu }^{+}{\mu }^{-}$ decays at the LHCb experiment
• Collider signals in unparticle physics
• Comments on Unparticles
• Unparticle Physics Effects on D0-anti-D0 Mixing
• Constraints on flavor-changing Z' models by B_s mixing, Z' production, and B_s -> μ^+ μ^-
• Some Phenomenologies of Unparticle Physics
• Large Time-dependent CP Violation in B_s^0 System and Finite D^0-D^0bar Mass Difference in Four Generation Standard Mode
• Relating D0-anti-D0 Mixing and D0 -> l+l- with New Physics
• $B_s-{\bar{B}}_s$ Mixing constraints on FCNC and a non-universal $Z^{\prime }$
• Search for the rare decay $D^0\to {\mu }^{+}{\mu }^{-}$
• Lepton flavor violating $\mu \to e\gamma$ and $\mu -e$ conversion in unparticle physics
• $D-\bar{D}$ mixing constraints on FCNC with a non-universal $Z^{\prime }$
• D-\bar D mixing and rare D decays in the Littlest Higgs model with non-unitarity matrix
• Updated Search for the Flavor-Changing Neutral-Current Decay D^0 \to μ + μ-
• Search for the decay modes D0 -> e+e-, D0 -> mu+mu-, and D0 -> e mu