4,954 research outputs found

    Production of the superheavy baryon Λccˉ(4209)\Lambda _{c\bar{c}}^{\ast}(4209) in kaon-induced reaction

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    The production of superheavy Λccˉ(4209)\Lambda _{c\bar{c}}^{\ast }(4209) baryon in the KpηcΛK^{-}p\rightarrow \eta _{c}\Lambda process via ss-channel is investigated with an effective Lagrangian approach and the isobar model. Moreover, the tt-channel with KK^{\ast } and uu-channel with nucleon exchange are also considered, which are regarded as the background for the Λccˉ(4209)\Lambda _{c\bar{c}}^{\ast }(4209) production in the KpηcΛK^{-}p\rightarrow \eta_{c}\Lambda reaction. The numerical results indicate it is feasible to searching for the superheavy Λccˉ(4209)\Lambda _{c\bar{c}}^{\ast }(4209) via KpK^{-}p scattering. These theoretical results not only provide valuable informations to future experimental exploration of Λccˉ(4209)\Lambda _{c\bar{c}}^{\ast }(4209) resonance but enable us to have a better understanding of the exotic baryons.Comment: 6 page

    Axion Free-kick Misalignment Mechanism

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    We propose an alternative scenario for the axion misalignment mechanism based on the nontrivial interplay between the axion and a light dilaton in the early universe. Dark matter abundance is still sourced by the initial misalignment of the axion field, whose motion along the potential kicks the dilaton field away from its minimum, and dilaton starts to oscillate later with a delayed onset time for oscillation and a relatively large misalignment value due to the kick; eventually the dilaton dominates over the axion in their energy densities, and the dilaton is identified as dark matter. The kick effect due to axion motion is the most significant if the initial field value of dilaton is near its minimum; therefore, we call this scenario axion free-kick misalignment mechanism, where axion plays the role similar to a football player. Dark matter abundance can be obtained with a lower axion decay constant compared to the conventional misalignment mechanism.Comment: v2: 5+3 pages, 4 figures, references added, typo fixed, some improvements, results unchange

    The Influence of Augmented Reality Technology on the Learning Interest, Achievement of Learning Goals and Cognitive Load of Middle School Students

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    In order to test the influence of augmented reality technology on the learning interest achievement of learning goals and cognitive load the instruction of topographic map was taken as an example for experimental study This paper selected 427 students from 8 classes of Grade one who all come from Zhantan Middle School in Xindu District of Chengdu as experimental samples set two classes with similar level in learning as one group the one is the experimental class and the other is the control class and formed 4 groups in total The experimental classes adopted AR three-dimensional videos as teaching aids to give new lessons and the control classes adopted traditional two- dimensional videos and then the students learning interest level achievement of learning goals and cognitive load were measured The results showed that the application of AR technology in teaching could improve students learning interest and achievement of learning goals but had no effect on reducing cognitive loa

    Prof. WANG Xiao-yun's Experience in Treating Climacteric Syndrome from the Pathogenesis of Kidney Deficiency and Liver Stagnancy

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