42 research outputs found
Physics at TESLA
The physics at a 500-800 GeV electron positron linear collider, TESLA, is
reviewed. The machine parameters that impact directly on the physics are
discussed and a few key performance goals for a detector at TESLA are given.
Emphasis is placed on precision measurements in the Higgs and top sectors and
on extrapolation to high energy scales in the supersymmetric scenario.Comment: Talk presented at Lake Louise Winter Institute 2001. 7 pages, 2
figure
Precision GMSB at a Linear Collider
We simulate precision measurements of gauge-mediated supersymmetry breaking
(GMSB) parameters at a 500 GeV e+e- linear collider in the scenario where a
neutralino is the next-to-lightest supersymmetric particle. Information on the
supersymmetry breaking and the messenger sectors of the theory is extracted
from the measured sparticle mass spectrum and neutralino lifetime.Comment: LaTeX + sprocl.sty + epsf.sty, 6 pages, 3 figures (5 eps files
Measuring Gauge-Mediated SuperSymmetry Breaking Parameters at a 500 GeV e+e- Linear Collider
We consider the phenomenology of a class of gauge-mediated supersymmetry
(SUSY) breaking (GMSB) models at a e+e- Linear Collider (LC) with c.o.m. energy
up to 500 GeV. In particular, we refer to a high-luminosity (L ~ 3 x 10^34
cm^-2 s^-1) machine, and use detailed simulation tools for a proposed detector.
Among the GMSB-model building options, we define a simple framework and outline
its predictions at the LC, under the assumption that no SUSY signal is detected
at LEP or Tevatron. Our focus is on the case where a neutralino (N1) is the
next-to-lightest SUSY particle (NLSP), for which we determine the relevant
regions of the GMSB parameter space. Many observables are calculated and
discussed, including production cross sections, NLSP decay widths, branching
ratios and distributions, for dominant and rare channels. We sketch how to
extract the messenger and electroweak scale model parameters from a spectrum
measured via, e.g. threshold-scanning techniques. Several experimental methods
to measure the NLSP mass and lifetime are proposed and simulated in detail. We
show that these methods can cover most of the lifetime range allowed by
perturbativity requirements and suggested by cosmology in GMSB models. Also,
they are relevant for any general low-energy SUSY breaking scenario. Values of
c*tau_N1 as short as 10's of microns and as long as 10's of metres can be
measured with errors at the level of 10% or better after one year of LC running
with high luminosity. We discuss how to determine a narrow range (<~ 5%) for
the fundamental SUSY breaking scale sqrt(F), based on the measured m_N1,
c*tau_N1. Finally, we suggest how to optimise the LC detector performance for
this purpose.Comment: 56 pages, 32 figures (48 eps files), LaTeX + epsf.sty + colordvi.sty.
Revision v2: minor changes/additions, version to be published in EPJ
Extracting GMSB Parameters at a Linear Collider
Assuming gauge-mediated supersymmetry breaking, we simulate precision
measurements of fundamental parameters at a 500 GeV e+e- linear collider in the
scenario where a neutralino is the next-to-lightest supersymmetric particle.
Information on the supersymmetry breaking and the messenger sectors of the
theory is extracted from realistic fits to the measured mass spectrum of the
Minimal Supersymmetric Model particles and the next-to-lightest supersymmetric
particle lifetime.Comment: 6 pages, LaTeX + epsf.sty, 3 figure
Muon Background Reduction in CLIC
We report on a study concerning the reduction of muon backgrounds in CLIC
using magnetised iron.Comment: Proceedings of the International Workshop on future Linear Colliders
2011 (LCWS11), Granada, Spain. 4 pages, 4 figure
Micron-scale laser-wire scanner for the KEK Accelerator Test Facility extraction line
A laser-wire transverse electron beam size measurement system has been constructed and operated at the Accelerator Test Facility (ATF) extraction line at KEK. The construction of the system is described in detail along with the environment of the ATF related to the laser wire. A special set of electron beam optics was developed to generate an approximately 1 mu m vertical focus at the laser-wire location. The results of our operation at the ATF extraction line are presented, where a minimum rms electron beam size of 4: 8 +/- 0: 3 mu m was measured, and smaller electron beam sizes can be measured by developing the method further. The beam size at the laser-wire location was changed using quadrupoles and the resulting electron beam size measured, and vertical emittance extracted
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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
Extracting GMSB parameters at a linear collider
Assuming gauge-mediated supersymmetry breaking, we simulate precision measurements of fundamental parameters at a 500 GeV linear collider in the scenario where a neutralino is the next-to-lightest supersymmetric particle. Information on the supersymmetry breaking and the messenger sectors of the theory is extracted from realistic fits to the measured mass spectrum of the Minimal Supersymmetric Model particles and the next-to-lightest supersymmetric particle lifetime