40 research outputs found
CP-odd observables in neutralino production with transverse e+ and e- beam polarization
We consider neutralino production and decay e^+e^ --> chi^0_i chi^0_j,
chi^0_j --> chi^0_1 f \bar{f} at a linear collider with transverse e^+ and e^-
beam polarization. We propose CP asymmetries by means of the azimuthal
distribution of the produced neutralinos and of that of the final leptons,
while taking also into account the subsequent decays of the neutralinos. We
include the complete spin correlations between production and decay. Our
framework is the Minimal Supersymmetric Standard Model with complex parameters.
In a numerical study we show that there are good prospects to observe these CP
asymmetries at the International Linear Collider and estimate the accuracy
expected for the determination of the phases in the neutralino sector.Comment: 30 pages, minor changes in the introduction, references adde
Towards Measuring the Stop Mixing Angle at the LHC
We address the question of how to determine the stop mixing angle and its
CP-violating phase at the LHC. As an observable we discuss ratios of branching
ratios for different decay modes of the light stop ~t_1 to charginos and
neutralinos. These observables can have a very strong dependence on the
parameters of the stop sector. We discuss in detail the origin of these
effects. Using various combinations of the ratios of branching ratios we argue
that, depending on the scenario, the observable may be promising in exposing
the light stop mass, the mixing angle and the CP phase. This will, however,
require a good knowledge of the supersymmetric spectrum, which is likely to be
achievable only in combination with results from a linear collider.Comment: 30 pages, 11 figures, version to appear in EPJ
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Research and Design of a Routing Protocol in Large-Scale Wireless Sensor Networks
无线传感器网络,作为全球未来十大技术之一,集成了传感器技术、嵌入式计算技术、分布式信息处理和自组织网技术,可实时感知、采集、处理、传输网络分布区域内的各种信息数据,在军事国防、生物医疗、环境监测、抢险救灾、防恐反恐、危险区域远程控制等领域具有十分广阔的应用前景。 本文研究分析了无线传感器网络的已有路由协议,并针对大规模的无线传感器网络设计了一种树状路由协议,它根据节点地址信息来形成路由,从而简化了复杂繁冗的路由表查找和维护,节省了不必要的开销,提高了路由效率,实现了快速有效的数据传输。 为支持此路由协议本文提出了一种自适应动态地址分配算——ADAR(AdaptiveDynamicAddre...As one of the ten high technologies in the future, wireless sensor network, which is the integration of micro-sensors, embedded computing, modern network and Ad Hoc technologies, can apperceive, collect, process and transmit various information data within the region. It can be used in military defense, biomedical, environmental monitoring, disaster relief, counter-terrorism, remote control of haz...学位:工学硕士院系专业:信息科学与技术学院通信工程系_通信与信息系统学号:2332007115216
Towards discrimination of MSSM and NMSSM scenarios at colliders
One of the challenging tasks at future experiments is the clear identification of the underlying new physics model. In this study we concentrate on the distinction between different supersymmetric models, the MSSM and the NMSSM, exploring the gaugino/higgsino sector as an alternative to the Higgs sector. Under the assumption that only the light chargino and neutralino masses and polarized cross sections , have been measured, we perform a fit of the fundamental MSSM parameters , , and and study whether a model distinction is possible. We focus here on the challenging cases of scenarios with a relatively heavy singlino and address two classes of neutralino mixing, higgsino-like versus gaugino-like