Difference: Summer2013 (19 vs. 20)

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Summer Students 2013

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Students

Jeff Picard

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 Jeff Picard
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<		Higgs properties measurement in H → γ γ
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>		Higgs properties measurement in H → γ γ
  After the discovery of a Higgs-like boson around 125 GeV it has become important to measure the properties of the new state. I am determining the expected sensitivity of our measurement of the particle's spin in the LHC run 2 dataset, and how proposed upgrades to CMS will affect the sensitivity.
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  Higgs decays using Razor variables
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<		I will be analyzing H → WW → llνν decays using razor variables for a high mass Higgs. This will then be extended to a boosted di-Higgs analysis in which each Higgs decays to a WW pair. Here the first WW undergoes a leptonic decay while the second WW pair (from the other Higgs) undergoes a fully hadronic decay producing merged jets.
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>		I will be analyzing H → WW → llνν decays using razor variables for a high mass Higgs. This will then be extended to a boosted di-Higgs analysis in which each Higgs decays to a WW pair. Here the first WW undergoes a leptonic decay while the second WW pair (from the other Higgs) undergoes a fully hadronic decay producing merged jets.
 

Natalie Harrison

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 Natalie Harrison

Dark matter production with the CMS detector at CERN

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 High energy particle colliders, like the LHC, are one of three ways proposed to detect dark matter. Dark matter is theorized to be a natural candidate for the lightest supersymmetric particle and is proposed to be a decay product in an event where SUSY sparticles are pair produced and decay into standard model quarks, which are detected in the collider and a neutralino that escapes detection (proposed DM). The other two methods are direct detection, in which we expect dark matter scattering off a nuclei, and indirect detection, in which dark matter annihilates and remnants of this annihilation are studied. Previous collider searches have been done for dark matter produced in association with a single photon or jet. My work looks specifically for events where dark matter particles are produced in association with at least two jets and leave behind a signature of large missing transverse energy (ET) in the detector. Because of the large amount of missing ET, we can utilize the razor variables MR and R2, developed initially for SuperSymmetry searches . My aim is to improve upper limits on the DM production cross section and translate these into the cross section of DM-nucleon interaction to compare with results from direct detection experiments. I also hope to analyze the results for various different theoretical models.

Ian Wessen

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 Ian Wessen
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>		Higgs physics through two decay channels, H → γ γ and H → WW
 
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<		H → γ γ : Superior resolution of ECAL and the clean kinematics of photon final states enable kinematic reconstruction of parent particles with great accuracy. I want to parametrize a fitting function against Monte Carlo Standard Model background processes and then compare this to the data from the photon photon final state. The pulls on the fit parameters suggest how well our standard model and the data from CMS agree.
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>		H → γ γ : Superior resolution of ECAL and the clean kinematics of photon final states enable kinematic reconstruction of parent particles with great accuracy. I want to parametrize a fitting function against Monte Carlo Standard Model background processes and then compare this to the data from the photon photon final state. The pulls on the fit parameters suggest how well our standard model and the data from CMS agree.
 
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<		H → WW : The decay to two W contains a lot of kinematic information, but there are many challenges is distinguishing our signal from background. Background sources of missing energy and dilepton final states require a series of discriminating cuts. My analysis focuses on vector boson fusion Higgs production with a characteristic 2-jet final state. By carefully choosing events with these signatures, we can then apply kinematic analysis à la razor techniques to learn about the Higgs.
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>		H → WW : The decay to two W contains a lot of kinematic information, but there are many challenges is distinguishing our signal from background. Background sources of missing energy and dilepton final states require a series of discriminating cuts. My analysis focuses on vector boson fusion Higgs production with a characteristic 2-jet final state. By carefully choosing events with these signatures, we can then apply kinematic analysis à la razor techniques to learn about the Higgs.
 

Da An

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 Da An

Future analysis for CMS Phase II Upgrade

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  Future analysis for CMS Phase II Upgrade
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<		My project is focused on the possible measurement of the trilinear Higgs self-coupling at 14 TeV. This will be done through an analysis of diHiggs production. I will be looking at the potential of analyzing the HH -> bbgammagamma decay channel in order to determine a significant value for the self-coupling.
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>		My project is focused on the possible measurement of the trilinear Higgs self-coupling at 14 TeV. This will be done through an analysis of diHiggs production. I will be looking at the potential of analyzing the HH -> bbgammagamma decay channel in order to determine a significant value for the self-coupling.
 

Valère Lambert

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 Valère Lambert
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>		HH → bbγγ decay
 
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<		With the upgrade of the CMS detector in 2020 to a luminosity of 14 TeV there will be the potential to measure the self-coupling constant of the Higgs boson, which has applications to measuring the Higgs potential. In order to better understand the significance of various backgrounds for di-Higgs events we will characterize the potential background channels for the HH → bbγγ decay. My three areas of interest will be events containing two fake photons produced with two real bottom jets, two mistagged charm jets, or two mistagged light jets. By determining the efficiency rates for these various faking events and normalizing by their cross sections, we may weight events in these background channels and produce the expected distributions and number of events for each channel.
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>		With the upgrade of the CMS detector in 2020 to a luminosity of 14 TeV there will be the potential to measure the self-coupling constant of the Higgs boson, which has applications to measuring the Higgs potential. In order to better understand the significance of various backgrounds for di-Higgs events we will characterize the potential background channels for the HH → bbγγ decay. My three areas of interest will be events containing two fake photons produced with two real bottom jets, two mistagged charm jets, or two mistagged light jets. By determining the efficiency rates for these various faking events and normalizing by their cross sections, we may weight events in these background channels and produce the expected distributions and number of events for each channel.
 

Gautam Upadhya

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 Gautam Upadhya

Razor variable analysis of simple SUSY models

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  I will be studying simple SUSY models using the razor variables. In particular I will be trying to distinguish between these models and the common ttbar background process, but using a multi-b-jet analysis. Some of the models of interest include RPV-gluino-gluino, T2bw, T2tt dna T6ttHH.

Cedric Flamant

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  Four Dimensional Shower Profiling for Time-of-Flight-Based Vertex Reconstruction
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  SUSY Searches
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<		I am currently working on generating collision events for the Simplified Model Spectra (SMS) models T1ttbb and T2tb with the objective of narrowing the search for SUSY particles. His primary work involves the optimization of code utilized by event generating and analysis software, such as MadGraph and Pythia, and the interpretation of incoming data to ensure that observations correspond with the pertinent models."
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>		I am currently working on generating collision events for the Simplified Model Spectra (SMS) models T1ttbb and T2tb with the objective of narrowing the search for SUSY particles. His primary work involves the optimization of code utilized by event generating and analysis software, such as MadGraph and Pythia, and the interpretation of incoming data to ensure that observations correspond with the pertinent models."
 
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Karla Peña

 
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Karla Peña

Karla Peña

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Dustin Anderson

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 Dustin Anderson

Associated production of W/Z bosons and jets

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  The production of a massive vector boson alongside one or more jets is an important background for Higgs and SUSY searches. I will analyze this background using the full CMS dataset, examining the scaling of the number of events as a function of jet multiplicity.
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Thomas Arnold

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  Machine Learning for the LHC Grid
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  Christopher Hayes
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<		Phase 2 Analysis of WW → 2l 2ν with high pileup

With the luminosity upgrades to the LHC in the next decade, the pileup in events will be approximately 3x larger than those seen at the end of Run 1. With this expectation, I'm currently working on analysis of these Phase 2 events, specifically looking at lepton detection efficiencies and MET in simulated Drell-Yan -> ee and WW -> 2l2nu events at 14TeV and 140 pileup. These channels are of particular interest to the continued study of the properties of the Higgs-like boson.

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>		Phase 2 Analysis of WW → 2l 2ν with high pileup
 
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>		With the luminosity upgrades to the LHC in the next decade, the pileup in events will be approximately 3x larger than those seen at the end of Run 1. With this expectation, I'm currently working on analysis of these Phase 2 events, specifically looking at lepton detection efficiencies and MET in simulated Drell-Yan -> ee and WW -> 2l2nu events at 14TeV and 140 pileup. These channels are of particular interest to the continued study of the properties of the Higgs-like boson.
 

Marco Cruz-Heredia

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General Information

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>		Summer Student Index
 

Information from Summer 2012

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<		Check last years twiki for further logistical info : https://twiki.hep.caltech.edu/twiki/bin/view/Main/Summer2012 Summer2012
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>		Check last years twiki for further logistical info : https://twiki.hep.caltech.edu/twiki/bin/view/Main/Summer2012 Summer2012
 
Projects and Final Reports from previous SURF students
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META FILEATTACHMENT attachment="GeorgesObied.jpg" attr="" comment="Georges Obied" date="1373490972" name="GeorgesObied.jpg" path="GeorgesObied.jpg" size="262286" user="dkcira" version="1"
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