481 research outputs found
Study of CMS sensitivity to neutrinoless decay at LHC
The Large Hadron Collider (LHC), scheduled to start operation in 2006, is
foreseen to provide in the first year of running a total of
leptons. CMS (Compact Muon Solenoid) is a general-purpose experiment
designed to study proton-proton and heavy-ion collisions at LHC. Even if the
Susy particles and Higgs searches togheter with the B-physics present its main
goal, the large amount of -lepton, could allow a systematic study of
tau-physics. We have performed a full simulation of CMS using GEANT 3 package
and the object-oriented reconstruction program ORCA to study the sensitivity to
neutrinoless tau decay and .
We present the analysis developed for these channels and the results obtained.Comment: Invited talk at the seventh international Workshop on tau lepton
physics (TAU02), Santa Cruz, Ca, Usa, September 2002 10 pages 15 eps figure
CleanET: enabling timing validation for complex automotive systems
Timing validation for automotive systems occurs in late integration stages when it is hard to control how the instances of software tasks overlap in time. To make things worse, in complex software systems, like those for autonomous driving, tasks schedule has a strong event-driven nature, which further complicates relating those task-overlapping scenarios (TOS) captured during the software timing budgeting and those observed during validation phases. This paper proposes CleanET, an approach to derive the dilation factor r caused due to the simultaneous execution of multiple tasks. To that end, CleanET builds on the captured TOS during testing and predicts how tasks execution time react under untested TOS (e.g. full overlap), hence acting as a mean of robust testing. CleanET also provides additional evidence for certification about the derived timing budgets for every task. We apply CleanET to a commercial autonomous driving framework, Apollo, where task measurements can only be reasonably collected under 'arbitrary' TOS. Our results show that CleanET successfully derives the dilation factor and allows assessing whether execution times for the different tasks adhere to their respective deadlines for unobserved scenarios.This work has been partially supported by the Spanish Ministry of Economy and Competitiveness (MINECO) under grant TIN2015- 65316-P, the SuPerCom European Research Council (ERC) project under the European Unionâs Horizon 2020 research and innovation programme (grant agreement No. 772773), and the HiPEAC Network of Excellence. MINECO partially supported Jaume Abella under Ramon y Cajal postdoctoral fellowship (RYC-2013-14717).Peer ReviewedPostprint (author's final draft
R-Parity Violation and Non-Abelian Discrete Family Symmetry
We investigate the implications of R-parity violating operators in a model
with family symmetry. The family symmetry can determine the form of R-parity
violating operators as well as the Yukawa matrices responsible for fermion
masses and mixings. In this paper we consider a concrete model with non-abelian
discrete symmetry Q_6 which contains only three R-parity violating operators.
We find that ratios of decay rates of the lepton flavor violating processes are
fixed thanks to the family symmetry, predicting BR(tau to 3e)/BR(tau to 3mu) ~
4 m_{mu}^2/m_{tau}^2.Comment: 20 pages, 3 figure
Testing and integrating the WLCG/EGEE middleware in the LHC computing
The main goal of the Experiment Integration and Support (EIS) team in WLCG is to help the LHC experiments with using proficiently the gLite middleware as part of their computing framework. This contribution gives an overview of the activities of the EIS team, and focuses on a few of them particularly important for the experiments. One activity is the evaluation of the gLite workload management system (WMS) to assess its adequacy for the needs of the LHC computing in terms of functionality, reliability and scalability. We describe in detail how the experiment requirements can be mapped to validation criteria, and the WMS performances are accurately measured under realistic load conditions over prolonged periods of time. Another activity is the integration of the Service Availability Monitoring system (SAM) with the experiment monitoring framework. The SAM system is widely used in the EGEE operations to identify malfunctions in Grid services, but it can be adapted to perform the same function on experiment-specific services. We describe how this has been done for some LHC experiments, which are now using SAM as part of their operations
Promoting self-facilitating feedback processes in coastal ecosystem engineers to increase restoration success:Testing engineering measures
Coastal ecosystem engineers often depend on selfâfacilitating feedbacks to ameliorate environmental stress. This makes the restoration of such coastal ecosystem engineers difficult. We question if we can increase transplantation success in highly dynamic coastal areas by engineering measures that promote the development of selfâfacilitating feedback processes.Intertidal blue mussels Mytilus edulis are a typical example of ecosystem engineers that are difficult to restore. A lack of selfâfacilitating feedbacks at low densities limits establishment success when young mussels are transplanted on dynamic mudflats.In a large field experiment, we investigated the possibility of increasing transplantation success by stimulating the formation of an aggregated spatial configuration in mussels, thereby reducing hydrologically induced dislodgment and the risks of predation. For this, we applied engineering measures in the form of fences that trapped wave dislodged mussels.Mussel loss rates were significantly lower when mussels were placed between both artificial fences, and in high densities (4.2 kg/m2) compared with mussels placed in areas without fences and in low densities (2.1 kg/m2). The fences induced the formation of a banded pattern with high local mussel densities, which locally reduced predation.Synthesis and applications. Our results underline the importance of actively promoting the development of selfâfacilitating processes, such as aggregation into patterns, in restoration projects of ecosystem engineers. In particular, the current study shows that engineering measures can help to initiate these kinds of selfâfacilitating interactions, especially in highly dynamic areas
Composite Leptoquarks at the LHC
If electroweak symmetry breaking arises via strongly-coupled physics, the
observed suppression of flavour-changing processes suggests that fermion masses
should arise via mixing of elementary fermions with composite fermions of the
strong sector. The strong sector then carries colour charge, and may contain
composite leptoquark states, arising either as TeV scale resonances, or even as
light, pseudo-Nambu-Goldstone bosons. The latter, since they are coupled to
colour, get a mass of the order of several hundred GeV, beyond the reach of
current searches at the Tevatron. The same generic mechanism that suppresses
flavour-changing processes suppresses leptoquark-mediated rare processes,
making it conceivable that the many stringent constraints may be evaded. The
leptoquarks couple predominantly to third-generation quarks and leptons, and
the prospects for discovery at LHC appear to be good. As an illustration, a
model based on the Pati-Salam symmetry is described, and its embedding in
models with a larger symmetry incorporating unification of gauge couplings,
which provide additional motivation for leptoquark states at or below the TeV
scale, is discussed.Comment: 10 pp, version to appear in JHE
Model-independent Analysis of Lepton Flavour Violating Tau Decays
Many models for physics beyond the Standard Model predict lepton-flavour
violating decays of charged leptons at a level which may become observable very
soon. In the present paper we investigate the decays of a Tau into three
charged leptons in a generic way, based on effective-field-theory methods,
where the relevant operators are classified according to their chirality
structure. We work out the decay distributions and discuss phenomenological
implications.Comment: 14 pages, 10 figures, references and comments adde
Ozone as adjuvant support in the treatment of covid-19: a preliminary report of probiozovid trial
This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1002/jmv.26636.Rationale: The evaluation of new therapeutic resources against COVID-19 represents a priority in clinical research considering the minimal options currently available.
Objectives: To evaluate the adjuvant use of systemic oxygen-ozone administration in the early control of disease progression in patients with COVID-19 pneumonia.
Methods: PROBIOZOVID is an ongoing, interventional, randomized, prospective, double-arm trial enrolling patient with COVID-19 pneumonia. From a total of 85 patients screened, 28 were recruited. Patients were randomly divided into ozone- autohemotherapy group (14) and control group (14). The procedure consisted in a daily double-treatment with systemic Oxygen-Ozone administration for 7 days. All patients were treated with ad interim best available therapy.
Measurements and Main Results: The primary outcome was delta in the number of patients requiring orotracheal-intubation despite treatment. Secondary outcome was the difference of mortality between the two groups. Moreover, haematological parameters were compared before and after treatment.
No differences in the characteristics between groups were observed at baseline. As a preliminary report we have observed that one patient for each group needed intubation and was transferred to ITU. No deaths were observed at 7-14 days of follow up. Thirty-day mortality was 8,3% for ozone group and 10% for controls. Ozone therapy didnât significantly influence inflammation markers, haematology profile and lymphocyte subpopulations of patients treated. Ozone therapy had an impact on the need for the ventilatory support, although didnât reach statistical significance. Finally, no adverse events related to the use of ozone-autohemotherapy were reported.
Conclusions: Preliminary results, although not showing statistically significant benefits of ozone on COVID-19, did not report any toxicity
Deep-Ocean dissolved organic matter reactivity along the Mediterranea Sea: does size matter?
Original research paperDespite of the major role ascribed to marine dissolved organic matter (DOM) in the global carbon
cycle, the reactivity of this pool in the dark ocean is still poorly understood. Present hypotheses,
posed within the size-reactivity continuum (SRC) and the microbial carbon pump (MCP) conceptual
frameworks, need further empirical support. Here, we provide field evidence of the soundness of the
SRC model. We sampled the high salinity core-of-flow of the Levantine Intermediate Water along its
westward route through the entire Mediterranean Sea. At selected sites, DOM was size-fractionated
in apparent high (aHMW) and low (aLMW) molecular weight fractions using an efficient ultrafiltration
cell. A percentage decline of the aHMW DOM from 68â76% to 40â55% was observed from the Levantine
Sea to the Strait of Gibraltar in parallel with increasing apparent oxygen utilization (AOU). DOM
mineralization accounted for 30±3% of the AOU, being the aHMW fraction solely responsible for this
consumption, verifying the SRC model in the field. We also demonstrate that, in parallel to this aHMW
DOM consumption, fluorescent humic-like substances accumulate in both fractions and protein-like
substances decline in the aLMW fraction, thus indicating that not only size matters and providing field
support to the MCP modelHOTMIX (grant number CTM2011â30010-C02 01-MAR and 02-MAR) and the project FERMIO (MINECO, CTM2014-57334-JIN), both co-financed with FEDER funds; (reference BES-2012- 056175) from the Spanish Ministry of Economy, Industry and Competitivenes; the project MODMED from CSIC (PIE, 201730E020) and CSIC Program âJunta para la AmpliaciĂłn de Estudiosâ co-financed by the ESF (reference JAE DOC 040)VersiĂłn del editor2,92
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