(r7) Summer2013 < Main

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---+ Summer Students 2013
---+++++ Table of contents:

<br />%TOC{depth="5"}%
---++ Proposals
---+++ Procedure
   * Please go ahead and submit your proposal for CERN summer students urgently tomorrow Feb 15.
   * Link for potential supervisors to submit a project proposal(s): http://hrapps.cern.ch/auth/f?p=112:1
   * Login: AIS login name and password
   * Once you have completed your proposal please don't forget to hit the "create" button in order to submit your proposal as otherwise it will not be registered.
---+++ Adi Bornheim :
---+++++ A high precision time-of-flight detector for CMS

(Adi, Artur, Javier, Cristian) <br /><br />A time-of-flight (TOF) detector with a timing resolution of order a few pico <br />seconds is discussed for the CMS Phase II upgrade for the high luminosity <br />LHC (HL-LHC). A major challenge at HL-LHC will be the number of simultaneous <br />interactions per bunch crossing (pile-up, PU). An average of 140 PU interactions<br />is expected with the accelerator desing currently envisioned for HL-LHC. <br />Based on toy MC studies and fully simulated events algorithms<br />have to be developed which allow to associate a vertex location to a physics<br />object such as a Photon or a Jet. Filtering techniques need to be developed which <br />allow to suppress energy deposits from pile-up interactions in the object reconstruction. <br />The goal of the project is to work on the development of these algorithms,<br />test them on simulated events as well as on real CMS data.
---+++++ Geant simulation for a high precision time-of-flight detector for CMS

(Cristian, Adi, Artur, Emanuele)<br /><br />A time-of-flight (TOF) detector with a timing resolution of order a few pico <br />seconds is discussed for the CMS Phase II upgrade for the high luminosity <br />LHC (HL-LHC). A major challenge is to develop radiation hard detector technology<br />which allows the time of flight of all relevant final state particles produced in <br />LHC proton-proton collisions. A fundamental question is how the physical size<br />of a calorimetric device limits the achievable timing measurement precision.<br />The goal of this project is to carry out Geant as well as ray tracing simulation <br />based on the existing CMS ECAL crystals as well as proposed upgrade options <br />such as a crystal sampling calorimeter.
---+++++ ECAL calibration and performance in the presence of radiation induce noise

(Adi, Emanuele)<br /><br />The noise in the CMS electromagnetic calorimeter (ECAL) increases due to effects of<br />the radiation environment in LHC. This degrades the resolution performance and <br />has an impact of the isolation criterion which is used to distinguish electrons <br />and photons from jets. The increased noise also has an adverse effect on the ability<br />to select isolated low energy photons, which are used to calibrate the ECAL.<br />The goal of this project is to measure precisely the impact of the noise on the<br />ECAL performance and calibration procedure and develop a strategy to mitigate the<br />effect of the noise.
---+++ Emanuele Di Marco :
---+++++ H-&gt;WW-&gt;2l2nu with full decay kinematics

CMS data collected at pp collisions at 7 and 8 TeV in LHC Run1<br /> gave an observation for a Higgs-like boson with mass 126 GeV.<br /> For this mass, due to the large BR and very clean final state, one the most<br /> sensitive channel at CMS is H-&gt;WW-&gt;2l2nu. The problem with this decay<br /> mode is the absence of a clear mass peak due to two undetected<br /> neutrinos. The student should develop an alternative strategy<br /> for the usage of available decay kinematics, in order to<br /> separate the signal from non-resonant WW production and give<br /> access to the mass also in this channel.<br /> If this is achieved, the other informations of the opening<br /> angle of the leptons can be used to determine the spin/parity<br /> of the new particle.
---+++++ H -&gt; ZZ-&gt; 4 leptons property measurement

<br /> CMS data collected at pp collisions at 7 and 8 TeV in LHC Run1<br /> gave an observation for a Higgs-like boson with mass 126 GeV.<br /> The golden mode in terms of sensitivity to the Higgs mass is H -&gt; ZZ<br /> -&gt; 4 leptons final state. The student will study the applications of the full<br /> kinematics available in this channel to characterize the properties of<br /> a possible signal for a resonance in the still allowed mass range to<br /> distinguish a Standard Model Higgs boson from Higgs "look-alikes".<br /> He will also contribute to the experimental analysis using at<br /> best the information on lepton momentum determination to improve<br /> the determination of the mass of the new particle.
---+++ Artur Apresyan
---+++ Alex Mott
---+++++ Higgs properties measurement in H to gamma gamma

CMS data collected in the LHC run 1 has established the existence of a new boson with a mass near 125 GeV, which (among other modes) decays into two photons. Because of the extremely high resolution of the CMS Electromagnetic Calorimeter (ECAL) and relatively high signal yields in this channel, it is ideal to study the properties of this newly discovered particle. The student will study the properties of this boson with the existing LHC run 1 dataset and the expected sensitivity for precision measurement with the expected LHC run 2 dataset. The student will also measure the expected improvement in sensitivity for properties measurement from various proposed upgrades to the CMS detector, which will provide an important input to CMS upgrade planning.
---+++ *Yi Chen*
---+++++ HCAL noise

After LS1 there is a good chance we will collect data at 25ns spacing as opposed to 50ns bunch spacing with high pileup. This poses an interesting challenge for the sub-detectors to develop efficient noise filters/algorithms designed for short bunch spacing. Hadronic calorimeter is important for most physics we want to do at the LHC. As we didn't have physics runs with 25ns bunch spacing, not much has been developed so far in terms of filters. In this project we will probe different possibilities of the noise-signal rejection algorithms using collision data collected in 2012 at both 50ns bunch spacing and 25ns bunch spacing, as well as mixed samples from data to emulate condition of high pileup and short bunch spacing. It's a nice chance to do important pioneering work that will affect the way we reject noise in the next run period.

---+++ *Javier Duarte*
---+++++ Razoy SUSY

---+++ Si Xie
---+++++ Full event kinematics in H to Zgamma

CMS data collected at pp collisions at 7 and 8 TeV in LHC Run1<br /> gave an observation for a Higgs-like boson with mass 126 GeV.<br /> The decay channel of this boson to a Z boson and a photon has unique<br /> sensitivity to probe for heavy new particles that are not predicted by<br /> the Standard Model. The student will study a number of possible<br /> improvements to the sensitivity of the search including the use of the<br /> full event kinematics and the use of event by event mass resolution.<br /> In addition, the student will study the possibility to use the full<br /> event kinematics to characterize additional properties of the Higgs-like<br /> boson.
---++ Students
---+++ Jeff Picard
---+++ Einstein
---+++ Bohr
---++ General Information

---+++ Information from Summer 2012

Check last years twiki for further logistical info : https://twiki.hep.caltech.edu/twiki/bin/view/Main/Summer2012
[[Summer2012][Summer2012]]

---+++++ Projects and Final Reports from previous SURF students
   * [[http://resolver.caltech.edu/CaltechAUTHORS:20130219-192830641][Takeda, Alex and Spiropulu, M. and Xie, S. and Di Marco, E. Validation of procedures used by CMS in the characterization of Higgs candidate events]]
   * [[http://resolver.caltech.edu/CaltechAUTHORS:20130219-192428019][Horton, Max and Spiropulu, M. and Duarte, J. and Rogan, C. (2011) Developing A Maximum Likelihood Fit Workspace In RooFit/ROOT]]
   * [[http://resolver.caltech.edu/CaltechAUTHORS:20130219-192153114][Lee, Lisa and Spiropulu, M. and Chen, Y. and Apresyan, A. (2012) Optimization of the hadron calorimeter in the CMS detector in the search for physics beyond the Standard Model]]
   * [[http://resolver.caltech.edu/CaltechAUTHORS:20130219-191834156][Lee, Lisa and Spiropulu, M. and Chen, Y. and Apresyan, A. (2012) Study of the HCAL Fit-Based Noise Filters in 2012 Data]]
   * [[http://resolver.caltech.edu/CaltechAUTHORS:20130219-191423551][Chen, Kevin and Spiropulu, M. and Kcira, D. and Bunn, J. (2012) Using Map/Reduce for Analyzing Physics Data from the Large Hadron Collider]]
   * [[http://resolver.caltech.edu/CaltechAUTHORS:20130219-185547501][Chun, Sung Bong and Spiropulu, M. (2012) Study of Lepton Final States in Proton-Proton Collisions with the CMS Detector at the LHC]]
   * [[http://resolver.caltech.edu/CaltechAUTHORS:20130219-190325036][Lambert, Valere and Bornheim, A. and Spiropulu, M. (2012) Measurement of the CMS ECAL Performance with Z Dielectron Decay Events in 2012 Data]]
   * [[http://resolver.caltech.edu/CaltechAUTHORS:20130219-185131112][Tong, Tony and Di Marco, E. and Spiropulu, M. (2012) Measurement of Z+jets/W+jets with muon final states Berends-Giele Scaling using 5 fb&#8722;1 of data at sqrt(s)=8TeV]]
   * [[http://resolver.caltech.edu/CaltechAUTHORS:20130219-183700972][Takeda, Alex and Spiropulu, Maria and Di Marco, Emanuele (2012) Study of Higgs detection in CMS experiment, and of the sensitivity to a Higgs boson in the mH < 130 GeV range]]
   * [[http://resolver.caltech.edu/CaltechAUTHORS:20130219-184732430][Tong, Tony and Di Marco, E. and Spiropulu, M. (2012) W+jets and Z+jets studies with 5 fb&#8722;1 of proton-proton collisions at sqrt(s) = 8 TeV]]
Topic revision: r7 - 2013-02-22 - dkcira
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