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Michigan REU Summer Student Program
Description
Presentations by the University of Michigan REU Summer Students
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Introductory Remarks 15mSpeakers: Christoph Emanuel Gull (University of Michigan (US)), Junjie Zhu (University of Michigan (US)), Steven Goldfarb (University of Michigan (US))
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Automated Grid Monitoring for LHCb Experiment through HammerCloud 5mAbstract: The Worldwide Large Hadron Collider Computing Grid (WLCG) links 170 computing sites from around the world, creating the world's largest grid computer. Jobs from LHC experiments are submitted to the grid for processing, simulation, and analysis. A framework called HammerCloud has been developed to assist in live monitoring of the health of the grid. This project aims to extend HammerCloud's monitoring capabilities for ATLAS and CMS to the LHCb experiment, ensuring reliable user access to data and measuring the stability of grid health.Speaker: Bradley Dice
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Fast Timing Simulations of HGCal for CMS 5mPresenter: Sarah Marie Bruno Abstract: Higgs boson production in proton-proton collisions can occur via the fusion of two gluons or by the fusion of vector-bosons (VBF) as well as other, rarer mechanisms. Separating the two production mechanisms is of crucial importance for precision test of electro-weak symmetry breaking. VBF production can be tagged by identifying the jets originating from the two vector bosons when they fuse into a Higgs boson. These jets are typically in a pT range below 50 GeV and are in an eta range beyond eta 2.5. This poses challenges to the reconstruction of such jets as the detector region they are detected in is heavily contaminated by activity from parasitic collisions (pile-up, PU). Various techniques are utilized to separate activity steaming from the actual VBF jet and activity from the PU collisions. A novel approach uses in addition the time of arrival of the energy of particles in the calorimeter. With a timing measurement precision of order 100 ps or better one can exploit the time of flight information to reconstruct the origin of particles and test the consistency of the arrival time in the calorimeter. In the context of the CMS Phase II upgrade forward calorimeter options with enhanced timing performance have been proposed. In this project the simulation of these options allows to study algorithms using the timing measurement of the calorimeters with an assumed resolution of a few 10 ps. Real CMS data can also be used to validate the simulation results.
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Measuring the lepton charge misidentification rate for SUSY analysis 5mElectron charges can sometimes be misidentified in the ATLAS detector, i.e. a positron could be read as an electron or vice versa. Obviously this can be a problem when taking data, however this is also important as certain decays in electroweak SUSY would give same-sign lepton pairs. The methods that will be used are tag-and-probe and the likelihood method.Speaker: Gabriel Emmanuel Gallardo (University of Hong Kong (HK))
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Measurement of the top quark mass in single top events using tracks only 5mAbstract: The top mass is crucial to our understanding of the Standard Model. Many analyses have been performed, to ever increasing precision, to narrow down the range of the top mass. This analysis uses the reconstructed tracks from the CMS detector to reconstruct the top and determine its mass. With this technique, we hope to eliminate several uncertainties in the measurement.Speaker: Elizabeth Drueke (CERN)
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Design of Experiments for the 2015 CLOUD Run 5mAbstract: The next series of CLOUD experiments will aim to understand the effect of several factors on cloud formation, including seven parameters such as the concentration of different chemical compounds, temperature, and ionization rates due to cosmic rays. A maximin Latin hypercube sampling technique will be used to determine a design data set in this seven dimensional space to provide the most comprehensive determination of the effect on nucleation rate. A Gaussian process emulator can then predict the nucleation rates across the sampling space, and, when applied to a climate model, the nucleation rates in Earth's atmosphere.Speaker: Sarah Frances Maddox (University of Michigan (US))
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Defining Separatrices of Penning Traps with Strong Magnetic Mirrors 5mA magnetic mirror is used to cool our antimatter plasma to 10 microkelvin. This magnetic mirror is highly asymmetric. The current literature defines the separatrix of only of magnetic mirrors with a small mirror coefficient. To see the effects of our trap on the cooling of particles, we need to define the characteristics of our unique trap.Speaker: Stephanie Brown (Penn State)
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