Subleading Hadronic Vacuum Polarization Contributions to Muon g−2: μ+μ- → π0γ*
Deog Ki Hong, Du Hwan Kim, Jong-Wan Lee
Department of Physics, Pusan National University, Busan 46241, Korea
We consider the subleading contributions of the hadronic vacuum polarization, involving the π0γ*γ* transition form factor, to the muon anomalous magnetic moment g−2. Various models for the form factor, based on hadronic ansatzes and holographic principles, are considered : They are the Wess-Zumino-Witten, vector meson dominance, lowest meson dominance (one and two vector resonances), and anti-de Sitter/quantum chromodynamics models. The model parameters are determined by fitting the experimental data for the e+e→π0γ* total cross section. It is our purpose to decide which model describes well the π0γ*γ* transition form factor by comparing with dispersive results.
J. Korean Phy. Soc. 2018; 72: 221-227  https://doi.org/10.3938/jkps.72.221
Hawking Effects as a Noisy Quantum Channel
Doyeol Ahn
Department of Electrical and Computer Engineering and Center for Quantum Information Processing, University of Seoul, Seoul 02504, Korea
Physics Department, Charles E. Schmidt College of Science, Florida Atlantic University, Boca Raton 33431-0991, USA
It was shown that the evolution of the bipartite entangled state near the black hole with the Hawking radiation can be described by a noisy quantum channel, having a complete positive map with an “operator sum representation.” The bipartite entangled state becomes bipartite mixed Gaussian state as the black hole evaporates. By comparing negativity and entanglement monotone with the analytical form of the entanglement fidelity, we found that the negativity and the entanglement monotone provide the upper and the lower bounds of the entanglement fidelity, respectively.
J. Korean Phy. Soc. 2018; 72: 201-207  https://doi.org/10.3938/jkps.72.201
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