arXiv subjects

C. C. Liu

Publications and source records attributed to C. C. Liu.

4 recordsLinked to original sources

arXiv2014

A high-contrast coronagraph for earth-like exoplanet direct imaging: design and test

The high-contrast coronagraph for direct imaging earth-like exoplanet at the visible needs a contrast of 10^(-10) at a small angular separation of 4 lambda/D or less. Here we report our recent laboratory experiment that is close to the limits. The test of the high-contrast imaging coronagraph is based on our step-transmission apodized filter. To achieve the goal, we use a liquid crystal array (LCA) as a phase corrector to create a dark hole based on our dedicated focal dark algorithm. We have suppressed the diffracted and speckle noise near the star point image to a level of 1.68 x 10^(-9) at 4 lambda/D, which can be immediately used for the direct imaging of Jupiter like exoplanets. This demonstrates that high-contrast coronagraph telescope in space has the potentiality to detect and characterize earth-like planets.

astro-ph.IM↗

arXiv2003

Study of $B_{s}\to (η,η',ϕ)\ell\bar{\ell}$ Decays

We study the rare decays of $B_{s} \to M_s\ell \bar{\ell}$ ($M_s=η, η',ϕ$ and $\ell=ν,e,μ,τ$) in the standard model. With the hadronic form factors evaluated in the light front and constituent quark models, we estimate the decay branching ratios, respectively. We also discuss the longitudinal lepton polarization and forward-backward asymmetries.

hep-ph↗

arXiv2002

Study of Rare $B_c^+\to D_{d,s}^{(*) +}l\bar{l}$ Decays

We study the rare decays of $B_c^+\to D_{q}^{(*)+}l\bar{l}$ ($q=d,s$ and $l=ν_l,e,μ,τ)$ in the standard model. The form factors are evaluated in the light front and constituent quark models, respectively. We find that the decay branching ratios calculated in the two models for $B_c^+\to D^+_q l\bar{l}$ agree well with each other, whereas those for $B_c^+\to D_q^{*+}l\bar{l}$ are different.

hep-ph↗

arXiv2000

$K_L\toγν\barν$ in the Light Front Model

We study the CP conserving and violating contributions to the decay of $\knng$ in the standard model. In our analysis, we use the form factors for $K\toγ$ transitions calculated directly in the entire physical range of momentum transfer within the light front model. We find that the branching ratios for the CP conserving and violating parts are about $1.0\times 10^{-13}$ and $1.5\times 10^{-15}$, respectively.

hep-ph↗