Alignment of the ATLAS Inner Detector Tracking System

The ATLAS detector at CERN's Large Hadron Collider (LHC) is equipped with a tracking system at its core (the Inner Detector, ID) consisting of silicon and gaseous straw tube detectors. The physics performance of the ID requires a precision alignment; a challenge involving complex algorithms and significant computing power. The alignment algorithms were already validated on: Combined Test Beam data, Cosmic Ray runs and simulated physics events. The alignment chain was tested on a daily basis in exercises that mimicked ATLAS data taking operations. ID commissioning after final installation into the ATLAS detector has yielded thousands of reconstructed cosmic ray tracks, which have been used for an initial alignment of the ID before the LHC start-up. A hardware system using Frequency Scanning Interferometry will be used to monitor structural deformations. Given the programme outlined here, the ATLAS Inner Detector has had a solid preparation for LHC collisions.Comment: ICHEP0

Searches for Extra Dimensions at the Tevatron

Models in which gravity and/or Standard Model gauge bosons propagate in more than three spatial dimensions have implications that can be tested at current colliders. In this paper, we report on the results from searches for extra dimensions at the two Tevatron experiments, CDF and D0, which utilize up to 200 pb^-1 of proton-antiproton collision data from Run II taken at 1.96 TeV CoM energy, between spring 2002 and fall 2003.Comment: 10 Pages. Proceedings, Hadron Collider Physics (HCP 2004), E. Lansing, Michigan, US

Exotic Quark Production in ep Collisions

We investigate the single production and decay of charge -1/3, weak isosinglet vectorlike exotic $D$ quarks in string inspired $E_6$ theories at future ep colliders; THERA with $\sqrt s$=1 TeV, L=40 $pb^{-1}$ and CERN Large Hadron Electron Collider (LHeC) with $\sqrt s$=1.4 TeV, $L=10^4$ $pb^{-1}$. We found that an analysis of the decay modes of $D$ should probe the mass ranges of 100-450 GeV and 100-1200 GeV at the center of mass energies, 1 and 1.4 TeV, respectively.Comment: 13 pages,8 figure

Multi-W Events at LHC from a Warped Extra Dimension with Custodial Symmetry

Randall-Sundrum models based on SU(2)_L * SU(2)_R with custodial symmetry are compelling frameworks for building alternative models of electroweak symmetry breaking. A particular feature of these models is the likely presence of light Kaluza-Klein fermions related to the right-handed top quark. These can be as light as a few hundred GeV and still compatible with EW precision constraints. In this article, we study the detectability of four-W final states at the LHC, which arise from the pair-production and tW decay of light Kaluza-Klein bottom quarks as well as light Kaluza-Klein quarks carrying electric charge 5/3.Comment: 17 pages, 26 figure

THE EFFECT OF TERRORISM ON TOURISM: EVIDENCE FROM TURKEY

The aim of this study is to investigate the effects of terrorism and other factors on Turkey’s tourism sector using unit root tests for known structural break points. We found that the tourist arrivals series is trend stationary with known structural break points. For the case of Turkey, there are two separate periods of terrorism which statistically have a meaningful negative effect on tourist arrivals. However, considering the trend stationary, these effects are transitory rather than being permanent.The Scientific and Technological Research Council of Turkey with the project number: 106K09

Does hemogram biomarkers predict mortality in intensive care population?

Aim: To compare hemogram-mediated inflammatory markers such as mean platelet volume (MPV), red cell distribution width (RDW), platelet distribution width (PDW), neutrophil to lymphocyte ratio (NLR), platelet to lymphocyte ratio (PLR), MPV to platelet ratio (MPR) and RDW to platelet ratio (RPR) in predicting outcome in the intensive care units (ICU) population. Methods: After obtaining approval of intuitional board the patients whom were treated in the Anesthesiology and Reanimation ICU of Bolu Abant Izzet Baysal University Hospital between March 2017 and December 2018 were evaluated retrospectively and enrolled to the study. The above-mentioned laboratory parameters of the deceased and survivors were compared. Results: The PDW, MPV, C-reactive protein (CRP), RPR and MPR values were significantly different between deceased and survived subjects. Moreover, MPV and PDW values ​​were significantly and positively correlated with serum CRP level. Conclusion: We suggest that PDW, MPV, MPR and RPR could be used in determining the severity of the disease in ICU patients along with CRP. Since these hemogram results could be obtained in a much shorter time period compared to CRP, they could be useful in this population; in which hours and even minutes are important in the treatment in ICU

Parallel Computing Studies for the Alignment of the ATLAS Silicon Tracker

The silicon system of the ATLAS Inner Detector consists of about 6000 modules in its Semiconductor Tracker and Pixel Detector. Therefore, the offline global fit alignment algorithm has to deal with solving a problem of up to 36000 degrees of freedom.32-bit single-CPU platforms were foreseen to be unable to handle such large-size operations needed by the algorithm. The proposed solution is to utilize a Beowulfcluster with a 64-bit architecture. We have performed the initial studies on performance of such a system using SCARF RAL cluster, compared with earlier predictions, obtained the first promising results on parallel computing for the ATLAS tracker alignment. After a brief introduction with the motivation, we will describe the hardware and software used and present the results of the studies, using also examples from the ATLAS simulated data

Beam Halo Monitoring at CDF

Losses from the proton and antiproton beams of the Fermilab Tevatron have been shown to produce a halo which contribute to backgrounds to physics signals in the Collider Detector at Fermilab (CDF). To provide a measure of the beam halo and losses, we have installed arrays of scintillation counters on both sides of the CDF detector. We describe here the physical configuration of these counters, their implementation and performance within the Fermilab Accelerator Control Network (ACNET). We show correlations between these new devices and the accelerator operating conditions. We point out that the use of these monitors is leading to improvement in the accelerator operations and reduced backgrounds in CDF.Comment: 27 pages, 17 figures, submitted to NIM