Multi-lepton Production at High Transverse Momentum in electron-proton collisions at HERA

Multi-electron and multi-muon production have been measured at high transverse momentum in electron-proton collisions at HERA.Good overall agreement is found with the Standard Model predictions, dominated by photon-photon interactions. Events are observed with a di-electron mass above 100 GeV, a domain where the Standard Model prediction is low.Comment: Talk presented at the 31st ICHEP, Amsterdam, The Netherlands, July 24-31, 2002, 4 pages 3 eps figures, includes espcrc2.sty. See http://www-h1.desy.de and http://www-h1.desy.d

Electroweak Measurements

The measurements of electroweak sector of the Standard Model are presented, including most recent results from LEP, Tevatron and HERA colliders. The robustness of the Standard Model is illustrated with the precision measurements, the electroweak fits and the comparisons to the results obtained from low energy experiments. The status of the measurements of the $W$ boson properties and rare production processes involving weak bosons at colliders is examined, together with the measurements of the electroweak parameters in $ep$ collisions.Comment: 12 pages, Proceedings of "Lepton-Photon 2005", Upsalla, Swede

Medical management and rehabilitation in a patient with avas-cular necrosis of the femoral head in the context of vitamin D deficiency and secondary hyperparathyroidism – case report

Vitamin D is essential in determining bone and muscle health. Vitamin D deficiency (VDD) produces secondary hyperparathyroidism, loss of bone quality and mass, mineral-ization effects and fractures, myopathy, and falls. The avascular necrosis (AVN) of the femoral head pathophysiology is still unclear and can be considered a vascular bone dis-ease. Our paper aimed to evaluate the etiology of AVN in a young male with bilateral fem-oral neck damage who required bilateral arthroplasty. Method: We present the case of a 46-year-old male patient with VDD and bilateral total hip arthroplasty for osteoarthritis secondary to AVN of the femoral head. After complete hormonal, biological, and imaging evaluations, the diagnosis of primary hyperparathyroidism was not supported; the im-provement of vitamin D deficiency after eight months of treatment clarified the diagnosis: hyperparathyroidism secondary to vitamin D deficiency. Results: Supplementation with 4000 IU of vitamin D improved the patient’s response to specific rehabilitation methods. Conclusions: Severe vitamin D deficiency can secondarily affect the structure of the femo-ral head through secondary hyperparathyroidism, producing AVN, but only osteopenia was obtained on DXA evaluation. VDD can be an important etiological factor in the occur-rence of AVN, and its correction can improve the evolution of the disease, improving the rehabilitation of these patients

PREDON Scientific Data Preservation 2014

LPSC14037Scientific data collected with modern sensors or dedicated detectors exceed very often the perimeter of the initial scientific design. These data are obtained more and more frequently with large material and human efforts. A large class of scientific experiments are in fact unique because of their large scale, with very small chances to be repeated and to superseded by new experiments in the same domain: for instance high energy physics and astrophysics experiments involve multi-annual developments and a simple duplication of efforts in order to reproduce old data is simply not affordable. Other scientific experiments are in fact unique by nature: earth science, medical sciences etc. since the collected data is "time-stamped" and thereby non-reproducible by new experiments or observations. In addition, scientific data collection increased dramatically in the recent years, participating to the so-called "data deluge" and inviting for common reflection in the context of "big data" investigations. The new knowledge obtained using these data should be preserved long term such that the access and the re-use are made possible and lead to an enhancement of the initial investment. Data observatories, based on open access policies and coupled with multi-disciplinary techniques for indexing and mining may lead to truly new paradigms in science. It is therefore of outmost importance to pursue a coherent and vigorous approach to preserve the scientific data at long term. The preservation remains nevertheless a challenge due to the complexity of the data structure, the fragility of the custom-made software environments as well as the lack of rigorous approaches in workflows and algorithms. To address this challenge, the PREDON project has been initiated in France in 2012 within the MASTODONS program: a Big Data scientific challenge, initiated and supported by the Interdisciplinary Mission of the National Centre for Scientific Research (CNRS). PREDON is a study group formed by researchers from different disciplines and institutes. Several meetings and workshops lead to a rich exchange in ideas, paradigms and methods. The present document includes contributions of the participants to the PREDON Study Group, as well as invited papers, related to the scientific case, methodology and technology. This document should be read as a "facts finding" resource pointing to a concrete and significant scientific interest for long term research data preservation, as well as to cutting edge methods and technologies to achieve this goal. A sustained, coherent and long term action in the area of scientific data preservation would be highly beneficial

Abdominal Compartment Syndrome – a Surgical Emergency

Over the past six decades, abdominal compartment syndrome (ACS) remained a very controversial subject, both in surgical and non-surgical specialties. Doctors failed to understand why critically ill patients died in the ICU with distended abdomens without fi nding any cause or why postoperative patients with wound defects such as dehiscence died after suturing the wound again „very tightly”. After the concept of intra-abdominal pressure (IAP) was established and methods for measuring it and diagnosing intra-abdominal hypertension (IAH) were available for clinicians to use it, it became clearer that ACS was a very serious and life threating pathology and the need for a correct treatment is essential. In this article we will try to make a literature review of the past decade and see when and how to diagnose correctly a patient with ACS and also how the diagnostic and treatments methods changed over the years

Status Report of the DPHEP Study Group: Towards a Global Effort for Sustainable Data Preservation in High Energy Physics

Data from high-energy physics (HEP) experiments are collected with significant financial and human effort and are mostly unique. An inter-experimental study group on HEP data preservation and long-term analysis was convened as a panel of the International Committee for Future Accelerators (ICFA). The group was formed by large collider-based experiments and investigated the technical and organisational aspects of HEP data preservation. An intermediate report was released in November 2009 addressing the general issues of data preservation in HEP. This paper includes and extends the intermediate report. It provides an analysis of the research case for data preservation and a detailed description of the various projects at experiment, laboratory and international levels. In addition, the paper provides a concrete proposal for an international organisation in charge of the data management and policies in high-energy physics

Study of ordered hadron chains with the ATLAS detector

La lista completa de autores que integran el documento puede consultarse en el archivo

A search for resonances decaying into a Higgs boson and a new particle X in the XH→qqbb final state with the ATLAS detector

A search for heavy resonances decaying into a Higgs boson ($H$) and a new particle ($X$) is reported, utilizing 36.1 fb$^{-1}$ of proton-proton collision data at $\sqrt{s} =$ 13 TeV collected during 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. The particle $X$ is assumed to decay to a pair of light quarks, and the fully hadronic final state $XH \rightarrow q\bar q'b\bar b$ is analysed. The search considers the regime of high $XH$ resonance masses, where the $X$ and $H$ bosons are both highly Lorentz-boosted and are each reconstructed using a single jet with large radius parameter. A two-dimensional phase space of $XH$ mass versus $X$ mass is scanned for evidence of a signal, over a range of $XH$ resonance mass values between 1 TeV and 4 TeV, and for $X$ particles with masses from 50 GeV to 1000 GeV. All search results are consistent with the expectations for the background due to Standard Model processes, and 95% CL upper limits are set, as a function of $XH$ and $X$ masses, on the production cross-section of the $XH\rightarrow q\bar q'b\bar b$ resonance