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Caltech CMS Summer Students 2015

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Test Beams and Timing

Time-based vertex reconstruction in CMS - Ben Bartlett

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Designed a vertexing algorithm for the future HGC (High-granularity calorimeter) using only spatial and timing information to reconstruct interaction vertex locations to sub-millimeter precision, and applied this to Higgs to di-photon events.

HGCal simulation analyses for CMS - Sarah Marie Bruno

Compared the performance of the current ECAL (Electromagnetic calorimeter) and the future HGC for the Higgs to di-photon channel. Also worked at the CERN test beam with a prototype Shashlik detector.

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Designed a vertexing algorithm for the future HGC (High-granularity calorimeter) using only spatial and timing information to reconstruct interaction vertex locations to sub-millimeter precision, and applied this to Higgs to di-photon events.

HGCal simulation analyses for CMS - Sarah Marie Bruno

Compared the performance of the current ECAL (Electromagnetic calorimeter) and the future HGC for the Higgs to di-photon channel. Also worked at the CERN test beam with a prototype Shashlik detector.

  Study of ECAL timing effects due to transparency using Pi0 decays from CMS - Kai Chang
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Used neutral pion events to study ECAL crystal timing response and transparency in 2015 data, including the relationship between the two variables.

 
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Precision timing analysis of July 2015 test beam data - Mohammad Hassan Hassanhashahi

Worked at the CERN test beam with a prototype Shashlik detector, and measured the timing resolution and properties of the rising edge of pulses from a Hamamatsu MCP-PMT.

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Precision timing analysis of July 2015 test beam data - Mohammad Hassan Hassanhashahi

Worked at the CERN test beam with a prototype Shashlik detector, and measured the timing resolution and rising edge properties of pulses from a Hamamatsu MCP-PMT (micro-channel plate photomultiplier tube).

  Timing resolution studies of Hamamatsu silicon photomultipliers - Eric Liu
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Worked at the FNAL test beam with Hamamatsu SiPMs (silicon-based photomultipliers), measured timing resolution with a picosecond-pulsed laser.

Direct tests of a pixelated microchannel plate as the active element of a shower maximum detector - Federico Presutti

Worked at the FNAL test beam to investigate use of Photek/Photonis MCPs in an electromagnetic shower maximum detector.

 
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Direct tests of a pixelated Microchannel Plate as the active element of a shower maximum detector - Federico Presutti
 
Machine Learning

Tracking by Neural Nets - Arash Jofrehei

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Trained neural networks for track reconstruction using PyBrain and Theanets libraries.

  Machine learning techniques for razor triggers - Marina Kolosova
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Trained neural networks to make razor trigger decisions, with focus on fast, hardware- compatible implementations.

  Machine learning for fast data transfers - Nikhil Krishnan
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Implemented a principle component analysis using data transfer information from the CMS PhEDEx (Physics Experiment Data Export) tool.

  Optimizing SUSY searches at CMS using machine learning techniques - Yuting Li
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Investigated use of SOMs (self-organizing map) for outlier detection in razor searches, and NADEs (Neural autoregressive density estimator) for pseudo-data production.

  Convolutional neural network - Sahand Seifnashri
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Investigated use of GPU-based convolution neural networks for a quark-gluon jet discriminator.

 
13 TeV Razor Analysis

Developing a search for dark matter direct production using razor variables at 13 TeV - Jared Filseth

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Measured jet transverse momentum resolution and bias in pointing reconstruction, hadronic razor trigger efficiency, and electron/muon reconstruction efficiencies in 8 TeV data and 13 TeV Monte Carlo samples for the razor analysis.

 
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Measured jet transverse momentum resolution and bias in pointing reconstruction, hadronic razor trigger efficiency, and electron/muon reconstruction efficiencies in 8 TeV data and 13 TeV Monte Carlo samples for the razor analysis.
 

CMS introduction course (July 8th - 10th) :

https://indico.cern.ch/event/402576/

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META FILEATTACHMENT attachment="Jofrehei.pdf" attr="" comment="Jofrehei Final Report" date="1454440716" name="Jofrehei.pdf" path="Jofrehei.pdf" size="600178" user="jlawhorn" version="1"
META FILEATTACHMENT attachment="Li_final_report.pdf" attr="" comment="Li Final Report" date="1454440735" name="Li_final_report.pdf" path="Li_final_report.pdf" size="784394" user="jlawhorn" version="1"
META FILEATTACHMENT attachment="Kolosova.pdf" attr="" comment="Kolosova Final Report" date="1454440756" name="Kolosova.pdf" path="Kolosova.pdf" size="665221" user="jlawhorn" version="1"
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META FILEATTACHMENT attachment="Presutti.pdf" attr="" comment="Presutti Final Report" date="1454447895" name="Presutti.pdf" path="Presutti.pdf" size="2534704" user="jlawhorn" version="1"
 
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