586 research outputs found
Probe of the Anomalous Quartic Couplings with Beam Polarization at the CLIC
We have investigated the anomalous quartic couplings defined by the
dimension-8 operators in semileptonic decay channel of the
process for
unpolarized and polarized electron (positron) beam at the Compact Linear
Collider. We give the confidence level bounds on anomalous
, and
couplings for various values of the integrated
luminosities and center-of-mass energies. The best sensitivities obtained on
anomalous , and
couplings through the process
with beam
polarization at TeV and an integrated luminosity of
fb are GeV, GeV, GeV,
which show improvement over the current bounds.Comment: 8 pages, 7 figures and 8 tables, published versio
Probing Charged Higgs Boson Couplings at the FCC-hh Collider
Many of the new physics models predicts a light Higgs boson similar to the
Higgs boson of the Standard Model (SM) and also extra scalar bosons. Beyond the
search channels for a SM Higgs boson, the future collider experiments will
explore additional channels that are specific to extended Higgs sectors. We
study the charged Higgs boson production within the framework of two Higgs
doublet models (THDM) in the proton-proton collisions at the FCC-hh collider.
With an integrated luminosity of 500 fb at very high energy frontier, we
obtain a significant coverage of the parameter space and distinguish the
charged Higgs-top-bottom interaction within the THDM or other new physics
models with charged Higgs boson mass up to 1 TeV.Comment: 22 pages, 26 figures, 6 table
Nanopore Sequencing Technology and Tools for Genome Assembly: Computational Analysis of the Current State, Bottlenecks and Future Directions
Nanopore sequencing technology has the potential to render other sequencing
technologies obsolete with its ability to generate long reads and provide
portability. However, high error rates of the technology pose a challenge while
generating accurate genome assemblies. The tools used for nanopore sequence
analysis are of critical importance as they should overcome the high error
rates of the technology. Our goal in this work is to comprehensively analyze
current publicly available tools for nanopore sequence analysis to understand
their advantages, disadvantages, and performance bottlenecks. It is important
to understand where the current tools do not perform well to develop better
tools. To this end, we 1) analyze the multiple steps and the associated tools
in the genome assembly pipeline using nanopore sequence data, and 2) provide
guidelines for determining the appropriate tools for each step. We analyze
various combinations of different tools and expose the tradeoffs between
accuracy, performance, memory usage and scalability. We conclude that our
observations can guide researchers and practitioners in making conscious and
effective choices for each step of the genome assembly pipeline using nanopore
sequence data. Also, with the help of bottlenecks we have found, developers can
improve the current tools or build new ones that are both accurate and fast, in
order to overcome the high error rates of the nanopore sequencing technology.Comment: To appear in Briefings in Bioinformatics (BIB), 201
FastRemap: A Tool for Quickly Remapping Reads between Genome Assemblies
A genome read data set can be quickly and efficiently remapped from one
reference to another similar reference (e.g., between two reference versions or
two similar species) using a variety of tools, e.g., the commonly-used CrossMap
tool. With the explosion of available genomic data sets and references,
high-performance remapping tools will be even more important for keeping up
with the computational demands of genome assembly and analysis.
We provide FastRemap, a fast and efficient tool for remapping reads between
genome assemblies. FastRemap provides up to a 7.82 speedup
(6.47, on average) and uses as low as 61.7% (80.7%, on average) of the
peak memory consumption compared to the state-of-the-art remapping tool,
CrossMap.
FastRemap is written in C++. The source code and user manual are freely
available at: github.com/CMU-SAFARI/FastRemap. Docker image available at:
https://hub.docker.com/r/alkanlab/fast. Also available in Bioconda at:
https://anaconda.org/bioconda/fastremap-bio.Comment: FastRemap is open source and all scripts needed to replicate the
results in this paper can be found at https://github.com/CMU-SAFARI/FastRema
Anomalous Single Production of the Fourth Generation Neutrino at Future ep Colliders
Possible single productions of the fourth standard model generation neutrino
via anomalous interactions at the future ep colliders are studied. Signatures
of such anomalous processes and backgrounds are discussed in detail. Discovery
limits for neutrino mass and achievable values of anomalous coupling strength
are determined.Comment: 11 pages, 6 figures, 5 table
Decentralized Estimation over Orthogonal Multiple-access Fading Channels in Wireless Sensor Networks - Optimal and Suboptimal Estimators
Optimal and suboptimal decentralized estimators in wireless sensor networks
(WSNs) over orthogonal multiple-access fading channels are studied in this
paper. Considering multiple-bit quantization before digital transmission, we
develop maximum likelihood estimators (MLEs) with both known and unknown
channel state information (CSI). When training symbols are available, we derive
a MLE that is a special case of the MLE with unknown CSI. It implicitly uses
the training symbols to estimate the channel coefficients and exploits the
estimated CSI in an optimal way. To reduce the computational complexity, we
propose suboptimal estimators. These estimators exploit both signal and data
level redundant information to improve the estimation performance. The proposed
MLEs reduce to traditional fusion based or diversity based estimators when
communications or observations are perfect. By introducing a general message
function, the proposed estimators can be applied when various analog or digital
transmission schemes are used. The simulations show that the estimators using
digital communications with multiple-bit quantization outperform the estimator
using analog-and-forwarding transmission in fading channels. When considering
the total bandwidth and energy constraints, the MLE using multiple-bit
quantization is superior to that using binary quantization at medium and high
observation signal-to-noise ratio levels
Search for Top Quark FCNC Couplings in Z' Models at the LHC and CLIC
The top quark is the heaviest particle to date discovered, with a mass close
to the electroweak symmetry breaking scale. It is expected that the top quark
would be sensitive to the new physics at the TeV scale. One of the most
important aspects of the top quark physics can be the investigation of the
possible anomalous couplings. Here, we study the top quark flavor changing
neutral current (FCNC) couplings via the extra gauge boson Z' at the Large
Hadron Collider (LHC) and the Compact Linear Collider (CLIC) energies. We
calculate the total cross sections for the signal and the corresponding
Standard Model (SM) background processes. For an FCNC mixing parameter x=0.2
and the sequential Z' mass of 1 TeV, we find the single top quark FCNC
production cross sections 0.38(1.76) fb at the LHC with sqrt{s_{pp}}=7(14) TeV,
respectively. For the resonance production of sequential Z' boson and decays to
single top quark at the Compact Linear Collider (CLIC) energies, including the
initial state radiation and beamstrahlung effects, we find the cross section
27.96(0.91) fb at sqrt{s_{e^{+}e^{-}}}=1(3) TeV, respectively. We make the
analysis to investigate the parameter space (mixing-mass) through various Z'
models. It is shown that the results benefit from the flavor tagging.Comment: 20 pages, 17 figures, 6 table
Unparticle physics in top pair signals at the LHC and ILC
We study the effects of unparticle physics in the pair productions of top
quarks at the LHC and ILC. By considering vector, tensor and scalar unparticle
operators, as appropriate, we compute the total cross sections for pair
production processes depending on scale dimension d_{\U}. We find that the
existence of unparticles would lead to measurable enhancements on the SM
predictions at the LHC. In the case of ILC this may become two orders of
magnitude larger than that of SM, for smaller values of d_\U, a very striking
signal for unparticles.Comment: 19 pages, 9 figures, analysis for ILC has been adde
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