Caltech CMS Summer Students 2015

Final Reports:

Test Beams and Timing

Time-based vertex reconstruction in CMS - Ben Bartlett

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

Used neutral pion events to study ECAL crystal timing response and transparency in 2015 data, including the relationship between the two variables.

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

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.

Machine Learning

Tracking by Neural Nets - Arash Jofrehei

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

Machine learning techniques for razor triggers - Marina Kolosova

Trained neural networks to make razor trigger decisions, with focus on fast, hardware- compatible implementations.

Machine learning for fast data transfers - Nikhil Krishnan

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

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

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

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/

Javiers tutorials :

Install ROOT on your laptop :

https://docs.google.com/document/d/1ss5EbpSYidwja7AHelUwNc3VRPqAjJ6cJ3jvDSl1244/edit?usp=sharing

RazorAnalyzer SURF Tutorial :

https://www.dropbox.com/sh/c10nl44gxvmfscp/AADmAUvFzcHtBWv1UlPJiI2ca?dl=0

CERN Timing Test Beam July 1st to 7th :

https://twiki.cern.ch/twiki/bin/viewauth/CMS/CMSFastTimingTestBeamSPSH2-Jul,2015

Saftey (and other) training at CERN :

https://espace.cern.ch/info-safetytraining-official/FAQ/Pages/default.aspx

Basic Saftey Rules and Regulations :

https://indico.cern.ch/event/323868/contribution/5/material/slides/0.pdf

Caltech timing twiki :

https://twiki.hep.caltech.edu/twiki/bin/view/Main/Phase2Upgrade

Tutorial for the pi0 calibration code :

https://twiki.hep.caltech.edu/pub/Main/Summer2015/15_03_03_EcalproTutorial.pdf

CERN summer student lectures (June 30th - August 3rd) :

http://summer-timetable.web.cern.ch/summer-timetable/

CERN Users Office :

http://usersoffice.web.cern.ch/

CMS Secretariat :

https://twiki.cern.ch/twiki/bin/view/CMSPublic/DrupalContactCMS

CMS Registration :

http://cms.cern.ch/iCMS/jsp/secr/reg/reg.jsp

twikis from previous years :

Summer Student Index

https://twiki.cern.ch/twiki/bin/view/CMS/CaltechSummerStudents (2010 and 2009)

https://twiki.hep.caltech.edu/twiki/bin/view/Main/Summer2011

https://twiki.hep.caltech.edu/twiki/bin/view/Main/Summer2012

https://twiki.hep.caltech.edu/twiki/bin/view/Main/Summer2013