Bulletin of the American Physical Society
Inaugural Fall 2009 Meeting of the Prairie Section of the APS
Volume 54, Number 17
Thursday–Saturday, November 12–14, 2009; Iowa City, Iowa
Session P1: Particle Physics IV |
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Chair: Robert Zwaska, Fermi National Accelerator Laboratory Room: IMU 348 (Illinois Room) |
Saturday, November 14, 2009 10:30AM - 10:42AM |
P1.00001: Mesons From String Theory Kory Stiffler After a brief historical synopsis of the connection between gauge theories and string theory is discussed, meson configurations known as $k$-strings will be discussed. $K$-strings can be examined from string theory via the gauge/gravity correspondence. Backgrounds dual to $k$-strings in both $2+1$ and $3+1$ will be discussed. The energy of $k$-strings to lowest order consists of a tension term, proportional to the length, $L$, of the $k$-string, i.e., the size of the mesons in the configuration. The first quantum correction is a Coulombic $1/L$ correction, known as a L\"uscher term, plus a constant. Acquiring tensions and L\"uscher terms via the gauge/gravity correspondence will be discussed. [Preview Abstract] |
Saturday, November 14, 2009 10:42AM - 10:54AM |
P1.00002: A data driven method to estimate high MET tail in QCD events Elif Asli Albayrak High pt multijet events with large missing energy is one of the important signature that will be used for supersymmetry discovery at LHC. Applying various analysis requirements in a cut-based study can reduce many Standard Model backgrounds. This channel, however, is vulnerable to fake missing energy that comes from mismeasured jets. Especially events which are produced by QCD processes will have fake missing energy, and rate of such events will be very high due to QCD cross-section. Even after optimized analysis cuts, QCD events will remain as a substantial background to this channel. In the early phases of LHC, studies based on Monte Carlo to estimate the fake missing energy from QCD events will not be reliable, thus, the use of data driven methods are imperative. In this talk we will present an estimation method for large missing transverse energy events in QCD background based on data for SUSY multi-jet and missing energy. This method is based on missing transverse energy projection fraction where mismeasured jet and low missing transverse momentum vectors are used to estimate high tail in missing transverse energy. [Preview Abstract] |
Saturday, November 14, 2009 10:54AM - 11:06AM |
P1.00003: Directly Coupled Tiles for a High Granularity Scintillator-SiPM Calorimeter Patrick Salcido Future detectors in high energy particle physics, such as those being proposed for the International Linear Collider (ILC), will require highly segmented hadron calorimetry. One goal in the design of such devices is to improve the jet energy resolution in order to separate Z and W decays into jets. One of the technologies being explored is using small scintillator cells in conjunction with silicon photo multipliers (SiPM) as photon sensors. This talk will present the status of the research being performed on this by the Northern Illinois University High-Energy Physics group in collaboration with Fermilab and the CALICE Collaboration. It will include results on the geometry used to directly couple the cells to the photo detectors, and the design and operation of the circuit board and associated electronics used to read out an array of scintillators. [Preview Abstract] |
Saturday, November 14, 2009 11:06AM - 11:18AM |
P1.00004: A High Precision Measurement of $\theta_{13}$ with the Daya Bay Antineutrino Detectors Bryce Littlejohn The Daya Bay Reactor Neutrino Experiment is being built to measure short-baseline electron antineturino disappearance at the Daya Bay nuclear reactor complex in southern China. Eight antineutrino detectors placed at different distances from the reactor cores will measure antineutrino flux and energy spectrum via inverse beta decay reactions on protons. Using this information, the experiment aims to identify the final neutrino mixing angle $\theta_{13}$ with a sensitivity of $\sin^{2}2\theta_{13} < .01$ at 90\% CL. As the Daya Bay sensitivity will ultimately be limited by detector-related systematics, understanding detector performance and identicalness will be crucial to meeting experimental goals. This talk will present the physics principles used in and the design of the detectors, the expected detector performance, an explanation of AD systematics, and the current status and future plans of the experiment. [Preview Abstract] |
Saturday, November 14, 2009 11:18AM - 11:30AM |
P1.00005: SUSY Searches at ATLAS in Di-jet and Multi-jet Channels Using Alternatives to Missing Transverse Energy Rishiraj Pravahan, Kaushik De We investigate the possibilities of discovering Supersymmetry (SUSY) in the di-jet and multi-jet channels using the ATLAS detector at the LHC with $\sqrt {s}=10$ TeV. This analysis investigates alternatives to reconstructed missing transverse energy ($E_T^{Miss}$) as the signature for LSP production in SUSY events, since ($E_T^{Miss}$) may be difficult to measure accurately during early data taking. Such alternative techniques of constructing kinematic variables can be used to search for new physics channels that produce jets and weakly interacting stable particles. We explore a number of kinematic variables to study the discovery significance for various SUSY models with $200 pb^{-1}$ of integrated luminosity. In this talk I would like to present the work we have done towards the goal to study and understand if any one or combination of these variables can be used in place of, or in conjunction with $E_T^{Miss}$, to yield better discovery significance. [Preview Abstract] |
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