8,489 research outputs found

    Hadronic decays of the highly excited 2D2D DsD_s resonances

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    Hadronic decays of the highly excited 2D2D DsD_s resonances have been studied in the 3P0^3P_0 model. Widths of all possible hadronic decay channels of the 2D2D DsD_s have been computed. Ds1∗(2700)D^*_{s1}(2700), Ds1∗(2860)D^*_{s1}(2860), Ds3∗(2860)D^*_{s3}(2860), D(2600)D(2600) and D(2750)D(2750) can be produced from hadronic decays of the 2D2D DsD_s, and relevant hadronic decay widths have been particularly paid attention to. The hadronic decay widths of 2D2D DsD_s to D(2600)D(2600) or D(2750)D(2750) may be large, and the numerical results are different in different assignments of D(2600)D(2600) and D(2750)D(2750). The hadronic decay widths of 2D2D DsD_s to Ds1∗(2860)D^*_{s1}(2860), Ds3∗(2860)D^*_{s3}(2860) or Ds1∗(2700)D^*_{s1}(2700) are very small, and different in different assignments of Ds1∗(2700)D^*_{s1}(2700).Comment: 7 pages, 1 figure. High Energy Physics - Theor

    5G Ultra-dense networks with non-uniform Distributed Users

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    User distribution in ultra-dense networks (UDNs) plays a crucial role in affecting the performance of UDNs due to the essential coupling between the traffic and the service provided by the networks. Existing studies are mostly based on the assumption that users are uniformly distributed in space. The non-uniform user distribution has not been widely considered despite that it is much closer to the real scenario. In this paper, Radiation and Absorbing model (R&A model) is first adopted to analyze the impact of the non-uniformly distributed users on the performance of 5G UDNs. Based on the R&A model and queueing network theory, the stationary user density in each hot area is investigated. Furthermore, the coverage probability, network throughput and energy efficiency are derived based on the proposed theoretical model. Compared with the uniformly distributed assumption, it is shown that non-uniform user distribution has a significant impact on the performance of UDNs.Comment: 14 pages, 10 figure

    Impact of Perk on Corporate Performance: The Mediating Effect of Agency Cost

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    As an important part of the executive compensation,perks can play a unique role in facilitating corporate performance. The relationship among agency cost, perk and corporate performance is a key issue faced by scholars. This paper selects companies listed on the Shanghai and Shenzhen stock exchanges from 2011 to 2016 as samples, excluding ST, ST * companies and financial insurance companies. We found that executive’s perk has a significant negative correlation with corporate performance. And executive’s perk has a significant positive correlation with agency cost. Through the influence of perk on corporate performance and agency cost, this study found that agency cost has a partial intermediary effect between perk and company performance
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