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A future Z-factory will offer the possibility of studying rare Z decays
, such as those leading to lepton flavor violation (LFV) final states. In this work, by considering the constraints from radiative two-body decays
, we investigate the LFV decays
in the framework of the Minimal R-symmetric Supersymmetric Standard Model with two benchmark points from the existing literature. The flavor-violating off-diagonal entries
,
and
are constrained by the current experimental bounds of
. Considering recent experimental constraints, we also investigate Br(
) as a function of
. The numerical results show that the theoretical predictions of Br(
) in the MRSSM are several orders of magnitude below the current experimental bounds. The LFV decays
and
may be promising observation targets in future experiments.
Using the effective Lagrangian method, we study the electroweak corrections to the magnetic dipole moment of muon from some special two-loop topological diagrams which are composed of chargino–sneutrino, neutralino–slepton, slepton–sneutrino, in the CP-violating minimal supersymmetric extension of the standard model. Considering the electromagnetic gauge invariance, we obtain the Wilson coefficients of those dimension 6 operators which induce the magnetic dipole moment of leptons. Adopting the zero-momentum substraction scheme, we remove the ultra-violet divergences induced by the divergent sub-diagrams. The numerical results indicate that the two-loop supersymmetric corrections from this sector to the muon magnetic dipole moment can exceed 10-10, which is the same order of present experimental precision.
Temperature gradient-induced Marangoni convection has attracted much attention for basic research and applications since it provides an effective means for mass and heat transfer through a liquid surface flow. Here the authors first propose a general principle to enhance such surface flow by hindering its transition to recirculation flow using an external field. They subsequently identify ferrofluid and use it validate the principle since its reduced magnetic susceptibility at higher temperatures will make the heated surface liquid stay on the surface by a thermomagnetic body force. Using a laser beam to create a heated local surface and a magnet beneath the ferrofluid to provide a vertical field, a high speed and long-range Marangoni flow is confirmed experimentally and further supported by computational fluid dynamics simulations. To demonstrate possible applications, the authors show a self-driving pipeless liquid conveyor belt that can efficiently transfer heat from a source to sink without external power. The demonstration of enhanced Marangoni convection opens new avenue to explore interfacial fluid dynamics and its wide applications.
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