2,920 research outputs found
ATLAS SM VH(bb) Run-2 Search
The Higgs boson discovered at the LHC in 2012 has been observed coupling
directly to and bosons and to leptons, and indirectly to top
quarks. In order to probe whether it is indeed the particle predicted by the
Standard Model, direct couplings of the Higgs boson to quarks must also be
measured. The Higgs boson decays most often to a pair of bottom quarks (with a
branching ratio of 58%). When the Higgs boson is produced alone in gluon-gluon
fusion, the signal in this decay mode is overwhelmed by the regular multi-jet
background. By requiring the Higgs boson to be produced in association with a
vector boson ( or ), which is further required to decay leptonically,
data events can be selected using charged-lepton or missing transverse energy
triggers. The Tevatron experiments presented combined results showing evidence
for the process at a significance level of about 3 standard
deviations, while the combined LHC results from Run-1 data show a 2.6 standard
deviation evidence for the decay mode. In this poster,
the ATLAS search using Run-2 data is summarised.Comment: 4 pages, 4 figures, Proceedings for the 38th International Conference
on High Energy Physics, Chicago, IL, USA, 03 - 10 Aug 2016,
http://cds.cern.ch/record/223160
Combined upper limit on Standard Model Higgs boson production at CDF
The Higgs boson is the only elementary particle predicted by the Standard
Model (SM) that has neither been confirmed nor refuted. The CDF collaboration
has performed SM Higgs searches in many channels using p\pbar collisions at a
centre-of-mass energy \sqrt{s}=1.96\tev. We present the latest combined Higgs
boson search at CDF. Since the previous year's combination, the sensitivity is
increased through the addition of new channels, the improvement of existing
channels and the addition of new data samples. We also use the latest parton
distribution functions and theoretical cross sections when
modelling the signal event yields. Using integrated luminosities of up to 8.2
\invfb, we observe a good agreement between data and the background
prediction. Since we do not see a Higgs boson excess, we set 95% CL upper
limits on the Higgs boson cross section in the range between 100 and 200
\gevcc, with 5 \gevcc increments. The observed (expected) limits for a 115
and a 165 \gevcc Higgs boson are 1.55 (1.49) and 0.75 (0.79) SM,
respectively. Since last year, the Higgs boson excluded range by CDF is
extended to 156.5 - 173.7 and 100 - 104.5 \gevcc.Comment: 4 pages, 5 figures, proceeding for the EPS 2011 CDF Standard Model
Higgs Combination, accepted for publication in the journal Proceedings of
Scienc
FUNCTIONAL BARRIERS IN IASI URBAN AREA
The forced industrialisation of cities resulted in the construction of giant sites in outlying areas. December 1989 triggered the decline of industrial activities, wich could not be sustained any longer. Gradually, industrial halls have been abandoned, turning into ghosts of past glory, „black spots” that visually pollute the city’s image. The article highlitghts the tendency of these abandoned spaces to become true functional barriers. Occupying large spaces, the former industrial units are a barrier to communication (moving obstacle) and for the development of certain areas. Perceveid as dangerous places, with a low security level, the problem of abandoned areas would be a subject for the terriorial marketing strategies. in this regard, putting into value the results of a field survey, the article studies the perception of the urban brownfields, applied for Ia?i as a case study.industrial zone, functional barrier, communication, perception, image.
Development of models for predicting Torsade de Pointes cardiac arrhythmias using perceptron neural networks
Blockage of some ion channels and in particular, the hERG cardiac potassium
channel delays cardiac repolarization and can induce arrhythmia. In some cases
it leads to a potentially life-threatening arrhythmia known as Torsade de
Pointes (TdP). Therefore recognizing drugs with TdP risk is essential.
Candidate drugs that are determined not to cause cardiac ion channel blockage
are more likely to pass successfully through clinical phases II and III trials
(and preclinical work) and not be withdrawn even later from the marketplace due
to cardiotoxic effects. The objective of the present study is to develop an SAR
model that can be used as an early screen for torsadogenic (causing TdP
arrhythmias) potential in drug candidates. The method is performed using
descriptors comprised of atomic NMR chemical shifts and corresponding
interatomic distances which are combined into a 3D abstract space matrix. The
method is called 3D-SDAR (3 dimensional spectral data-activity relationship)
and can be interrogated to identify molecular features responsible for the
activity, which can in turn yield simplified hERG toxicophores. A dataset of 55
hERG potassium channel inhibitors collected from Kramer et al. consisting of 32
drugs with TdP risk and 23 with no TdP risk was used for training the 3D-SDAR
model.An ANN model with multilayer perceptron was used to define collinearities
among the independent 3D-SDAR features. A composite model from 200 random
iterations with 25% of the molecules in each case yielded the following figures
of merit: training, 99.2 %; internal test sets, 66.7%; external (blind
validation) test set, 68.4%. In the external test set, 70.3% of positive TdP
drugs were correctly predicted. Moreover, toxicophores were generated from TdP
drugs. A 3D-SDAR was successfully used to build a predictive model for
drug-induced torsadogenic and non-torsadogenic drugs.Comment: Accepted for publication in BMC Bioinformatics (Springer) July 201
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