New equation for deriving pure state density operators by Weyl correspondence and Wigner operator

By virtue of the completeness of Wigner operator and Weyl correspondence we construct a general equation for deriving pure state density operators. Several important examples are considered as the applications of this equation, which shows that our approach is effective and convenient for deducing these entangled state representations.     

Precise Measurement of Solar Neutrino Oscillation Parameters from Recent Experiments

We analyse the available data of solar neutrino experiments up to the date May 2008, including SK-Ⅰ, SK-Ⅱ, SNO phase-Ⅰ, SNO phase-Ⅱ and first-generation Ga and Cl experiments. They show great improvement in constraints on solar neutrino oscillation parameters. Together with the new results from long base line reactor experiment KamLAND, the parameters are precisely determined, with 1σ allowed region in △m12^2=7.586-0.203^＋0.212×10^-5eV^2,tan^2θ12=0.457-0.067^＋0.076.     

Solar Neutrino Oscillation Parameters after SNO Phase-Ⅲ and SAGE Part-Ⅲ

We analyse the recently published results from solar neutrino experiments SNO Phase-Ⅲ and SAGE Part-Ⅲ and show their constraints on solar neutrino oscillation parameters, especially for the mixing angle θ12. Through a global analysis using all existing data from SK, SNO, Ga＆Cl radiochemieal experiments and long base fine reactor experiment KamLAND, we obtain the parameters △m12^2= 7.684 -0.208^＋0.212×10^-5 eV^2, tan^2 θ12=0.440-0.057^＋0.059. also find that the discrepancy between the KamLAND and solar neutrino results can be reduced by choosing a small non-zero value for the mixing angle θ13.