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Revision 62013-05-23 - DanProtopopescu

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LC Project Progress

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  Project Interim Report
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Final Report
 

Invariant Mass of Higgs (MC simulated events)

Revision 52013-02-15 - DanProtopopescu

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LC Project Progress

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  The aim is to now implement a neural network flavour tagging processor to separate background and signal events, and to find how well the reconstructed particles compare with the “true” underlying particles. I will move on to look at the WW fusion process at a higher centre-of-mass energy and aim to construct a full Higgs cross-section analysis.
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Steps:
  • Reconstruct H->bb using truth tagging in ZH
  • Implement "real" b-tagging and do the same
  • Switch to WW fusion and find the H->bb peak there
  • Make a WW->H->bb cross-section measurement
 

Useful Links

Revision 42013-02-13 - GavinMurdoch

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LC Project Progress

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1 Feb 2013
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Histograms obtained using flavour tagging

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Project Overview
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Project Aim

 
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b jet mass: Approx 63.4% of entries of the 50000 events. (attachment: b_jet_mass50000.ps)
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The main aim is to study the properties of the Higgs particle and W W fusion in electron-positron collisions at a linear collider. The project will focus on the direct reconstruction of the H → b bbar decay mode, as this has the highest branching ratio for a Higgs of mass around 120 GeV as discovered at CERN.
 
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c jet mass: Approx 4.5% of entries of the 50000 events. (attachment: c_jet_mass50000.ps)

Applying a standard Gaussian fit to each histogram

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Project Interim Report

Invariant Mass of Higgs (MC simulated events)

 
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b_jet_mass50000_gaus.ps
NO. NAME VALUE ERROR SIZE DERIVATIVE
1 Contstant 1.84619e+03 1.65505e+01 1.65505e-01 -1.36235e+01
2 Mean 1.43781e+02 2.27872e-01 2.27872e-03 6.97079e+02
3 Sigma 2.87009e+01 1.87573e-01 1.87573e-03 -2.54553e+05

c_jet_mass50000_gaus.ps

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NO. NAME VALUE ERROR SIZE DERIVATIVE
1 Contstant 1.12333e+02 4.43832e+00 2.43818e-02 -2.43692e-06
2 Mean 1.45917e+02 8.79258e-01 7.26622e-03 3.50946e-05
3 Sigma 3.33814e+01 1.07541e+00 4.37790e-05 1.47982e-03
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Determined the invariant mass of the reconstructed Higgs boson in the MC simulated events from its two b jets, and its two c jets (from the decay mode of H → c cbar). Suitable Gaussian fits were applied to the invariant mass distributions to find the peak for these decay modes, with suitable errors quantified.

Attached plots:

H → b bbar with Gaussian fit

H → c cbar with Gaussian fit

Project Plan

The aim is to now implement a neural network flavour tagging processor to separate background and signal events, and to find how well the reconstructed particles compare with the “true” underlying particles. I will move on to look at the WW fusion process at a higher centre-of-mass energy and aim to construct a full Higgs cross-section analysis.

 

Useful Links

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META FILEATTACHMENT attachment="b_jet_mass50000_gaus.ps" attr="" comment="b jet mass from 50000 events with standard gaussian fit" date="1359743397" name="b_jet_mass50000_gaus.ps" path="b_jet_mass50000_gaus.ps" size="10903" stream="b_jet_mass50000_gaus.ps" tmpFilename="/usr/tmp/CGItemp22656" user="GavinMurdoch" version="1"
META FILEATTACHMENT attachment="c_jet_mass50000_gaus.ps" attr="" comment="c jet mass from 50000 events with standard gaussian fit" date="1359743413" name="c_jet_mass50000_gaus.ps" path="c_jet_mass50000_gaus.ps" size="9605" stream="c_jet_mass50000_gaus.ps" tmpFilename="/usr/tmp/CGItemp22753" user="GavinMurdoch" version="1"
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META FILEATTACHMENT attachment="b_jet_mass50000.ps" attr="" comment="b jet mass from 50000 events" date="1359744043" name="b_jet_mass50000.ps" path="b_jet_mass50000.ps" size="9954" stream="b_jet_mass50000.ps" tmpFilename="/usr/tmp/CGItemp22635" user="GavinMurdoch" version="1"
META FILEATTACHMENT attachment="c_jet_mass50000.ps" attr="" comment="c jet mass from 50000 events" date="1359744056" name="c_jet_mass50000.ps" path="c_jet_mass50000.ps" size="9218" stream="c_jet_mass50000.ps" tmpFilename="/usr/tmp/CGItemp22600" user="GavinMurdoch" version="1"
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META FILEATTACHMENT attachment="plot_gaus_limits_100_147.png" attr="" comment="Invariant Mass of Higgs (H->bb)" date="1360756154" name="plot_gaus_limits_100_147.png" path="plot_gaus_limits_100_147.png" size="24038" stream="plot_gaus_limits_100_147.png" tmpFilename="/usr/tmp/CGItemp29290" user="GavinMurdoch" version="1"
META FILEATTACHMENT attachment="cplot_gaus_limits_105_154.png" attr="" comment="Invariant Mass of Higgs (H->cc)" date="1360756217" name="cplot_gaus_limits_105_154.png" path="cplot_gaus_limits_105_154.png" size="20400" stream="cplot_gaus_limits_105_154.png" tmpFilename="/usr/tmp/CGItemp29258" user="GavinMurdoch" version="1"
META FILEATTACHMENT attachment="Murdoch_Gavin_0900886_InterimReport.pdf" attr="" comment="Higgs Properties Interim Report" date="1360757170" name="Murdoch_Gavin_0900886_InterimReport.pdf" path="Murdoch_Gavin_0900886_InterimReport.pdf" size="88483" stream="Murdoch_Gavin_0900886_InterimReport.pdf" tmpFilename="/usr/tmp/CGItemp29110" user="GavinMurdoch" version="1"

Revision 32013-02-05 - DanProtopopescu

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META TOPICPARENT name="WebHome"

LC Project Progress

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1 Feb 2013
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Histograms obtained using flavour tagging

Revision 22013-02-01 - GavinMurdoch

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META TOPICPARENT name="WebHome"

LC Project Progress

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1 Feb 2013
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Histograms obtained using flavour tagging

 
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Will include progress on this page
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b jet mass: Approx 63.4% of entries of the 50000 events. (attachment: b_jet_mass50000.ps)

c jet mass: Approx 4.5% of entries of the 50000 events. (attachment: c_jet_mass50000.ps)

Applying a standard Gaussian fit to each histogram

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b_jet_mass50000_gaus.ps

NO. NAME VALUE ERROR SIZE DERIVATIVE
1 Contstant 1.84619e+03 1.65505e+01 1.65505e-01 -1.36235e+01
2 Mean 1.43781e+02 2.27872e-01 2.27872e-03 6.97079e+02
3 Sigma 2.87009e+01 1.87573e-01 1.87573e-03 -2.54553e+05

c_jet_mass50000_gaus.ps

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NO. NAME VALUE ERROR SIZE DERIVATIVE
1 Contstant 1.12333e+02 4.43832e+00 2.43818e-02 -2.43692e-06
2 Mean 1.45917e+02 8.79258e-01 7.26622e-03 3.50946e-05
3 Sigma 3.33814e+01 1.07541e+00 4.37790e-05 1.47982e-03

Useful Links

META FILEATTACHMENT attachment="b_jet_mass50000_gaus.ps" attr="" comment="b jet mass from 50000 events with standard gaussian fit" date="1359743397" name="b_jet_mass50000_gaus.ps" path="b_jet_mass50000_gaus.ps" size="10903" stream="b_jet_mass50000_gaus.ps" tmpFilename="/usr/tmp/CGItemp22656" user="GavinMurdoch" version="1"
META FILEATTACHMENT attachment="c_jet_mass50000_gaus.ps" attr="" comment="c jet mass from 50000 events with standard gaussian fit" date="1359743413" name="c_jet_mass50000_gaus.ps" path="c_jet_mass50000_gaus.ps" size="9605" stream="c_jet_mass50000_gaus.ps" tmpFilename="/usr/tmp/CGItemp22753" user="GavinMurdoch" version="1"
META FILEATTACHMENT attachment="b_jet_mass50000.ps" attr="" comment="b jet mass from 50000 events" date="1359744043" name="b_jet_mass50000.ps" path="b_jet_mass50000.ps" size="9954" stream="b_jet_mass50000.ps" tmpFilename="/usr/tmp/CGItemp22635" user="GavinMurdoch" version="1"
META FILEATTACHMENT attachment="c_jet_mass50000.ps" attr="" comment="c jet mass from 50000 events" date="1359744056" name="c_jet_mass50000.ps" path="c_jet_mass50000.ps" size="9218" stream="c_jet_mass50000.ps" tmpFilename="/usr/tmp/CGItemp22600" user="GavinMurdoch" version="1"

Revision 12013-01-31 - GavinMurdoch

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META TOPICPARENT name="WebHome"

LC Project Progress

Will include progress on this page

 
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