15,841 research outputs found
Electron-nuclear entanglement in the cold lithium gas
We study the ground-state entanglement and thermal entanglement in the
hyperfine interaction of the lithium atom. We give the relationship between the
entanglement and both temperature and external magnetic fields.Comment: 7 pages, 3 figure
A Fast DOA Estimation Algorithm Based on Polarization MUSIC
A fast DOA estimation algorithm developed from MUSIC, which also benefits from the processing of the signals' polarization information, is presented. Besides performance enhancement in precision and resolution, the proposed algorithm can be exerted on various forms of polarization sensitive arrays, without specific requirement on the array's pattern. Depending on the continuity property of the space spectrum, a huge amount of computation incurred in the calculation of 4-D space spectrum is averted. Performance and computation complexity analysis of the proposed algorithm is discussed and the simulation results are presented. Compared with conventional MUSIC, it is indicated that the proposed algorithm has considerable advantage in aspects of precision and resolution, with a low computation complexity proportional to a conventional 2-D MUSIC
Searching for dark matter via mono- boson production at the ILC
High energy colliders provide a new unique way to determine the microscopic
properties of the dark matter (DM). Weakly interacting massive particles
(WIMPs) are widely considered as one of the best DM candidates. It is usually
assumed that the WIMP couples to the SM sector through its interactions with
quarks and leptons. In this paper, we investigate the DM pair production
associated with a boson in an effective field theory framework at the
International Linear Collider (ILC), which can be used to study the
interactions between the DM and leptons. For illustrative purposes, we present
the integrated and differential cross sections for the process, where the boson is radiated from the initial
state electron or positron. Meanwhile, we analyze the neutrino pair production
in association with a boson as the SM background.Comment: 12 pages, 5 figure
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