175 research outputs found
Jets in Deep-Inelastic Scattering at HERA and determinations of
Several methods to extract the strong coupling constant by means
of highly energetic jets in Deep-Inelastic Scattering are presented. The
results from the various methods agree with one another and with the world
average. The errors are competetive to those achieved in
determinations in other processes such as proton--anti-proton scattering.Comment: Proceedings of talk given at Lake Louise Winter Institute 2004,
Alberta, Canad
Studying Low-x Dynamics using the Hadronic Final State in DIS at HERA
This article describes different approaches to investigate the behavior of
parton evolution in the proton by exploiting various aspects of the hadronic
final state produced in Deep Inelastic Scattering Events at HERA.Comment: 3 Pages, 5 Figures. To appear in the proceedings of International
Europhysics Conference on High-Energy Physics (HEP 2003), Aachen, Germany,
17-23 Jul 200
Coherent noise source identification in multi channel analysis
The evaluation of coherent noise can provide useful information in the study
of detectors. The identification of coherent noise sources is also relevant for
uncertainty calculations in analyse where several channels are combined. The
study of the covariance matrix give information about coherent noises. Since
covariance matrix of high dimension data could be difficult to analyse, the
development of analysis tools is needed. Principal Component Analysis (PCA) is
a powerful tool for such analysis. It has been shown that we can use PCA to
find coherent noises in ATLAS calorimeter or the CALICE Si-W electromagnetic
calorimeter physics prototype. However, if several coherent noise sources are
combined, the interpretation of the PCA may become complicated.
In this paper, we present another method based on the study of the covariance
matrix to identify noise sources. This method has been developed for the study
of front end ASICs dedicated to CALICE calorimeters. These calorimeters are
designed and studied for experiments at the ILC. We also study the reliability
of the method with simulations. Although this method has been developped for a
specific application, it can be used for any multi channel analysis.Comment: Public version of the CALICE Internal Note CIN-02
CP-violating top quark couplings at future linear colliders
We study the potential of future lepton colliders to probe violation of the
CP symmetry in the top quark sector. In certain extensions of the Standard
Model, such as the two-Higgs-doublet model (2HDM), sizeable anomalous top quark
dipole moments can arise, that may be revealed by a precise measurement of top
quark pair production. We present results from detailed Monte Carlo studies for
the ILC at 500~\GeV{} and CLIC at 380~\gev{} and use parton-level simulations
to explore the potential of high-energy operation. We find that precise
measurements in production with subsequent decay
to lepton plus jets final states can provide sufficient sensitivity to detect
Higgs-boson-induced CP violation in a viable two-Higgs-doublet model. The
potential of a linear collider to detect CP-violating electric and
weak dipole form factors of the top quark exceeds the prospects of the HL-LHC
by over an order of magnitude
Physics Case for the International Linear Collider
We summarize the physics case for the International Linear Collider (ILC). We
review the key motivations for the ILC presented in the literature, updating
the projected measurement uncertainties for the ILC experiments in accord with
the expected schedule of operation of the accelerator and the results of the
most recent simulation studies.Comment: 37 pages, 12 figures, 2 tables; v2 - updates of reference
Report of the Topical Group on Electroweak Precision Physics and Constraining New Physics for Snowmass 2021
The precise measurement of physics observables and the test of their
consistency within the standard model (SM) are an invaluable approach,
complemented by direct searches for new particles, to determine the existence
of physics beyond the standard model (BSM). Studies of massive electroweak
gauge bosons (W and Z bosons) are a promising target for indirect BSM searches,
since the interactions of photons and gluons are strongly constrained by the
unbroken gauge symmetries. They can be divided into two categories: (a) Fermion
scattering processes mediated by s- or t-channel W/Z bosons, also known as
electroweak precision measurements; and (b) multi-boson processes, which
include production of two or more vector bosons in fermion-antifermion
annihilation, as well as vector boson scattering (VBS) processes. The latter
categories can test modifications of gauge-boson self-interactions, and the
sensitivity is typically improved with increased collision energy.
This report evaluates the achievable precision of a range of future
experiments, which depend on the statistics of the collected data sample, the
experimental and theoretical systematic uncertainties, and their correlations.
In addition it presents a combined interpretation of these results, together
with similar studies in the Higgs and top sector, in the Standard Model
effective field theory (SMEFT) framework. This framework provides a
model-independent prescription to put generic constraints on new physics and to
study and combine large sets of experimental observables, assuming that the new
physics scales are significantly higher than the EW scale.Comment: 55 pages; Report of the EF04 topical group for Snowmass 202
Recommended from our members
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
- …