(r4) GMProjectProgress < LinearCollider

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---+ LC Project Progress

%TOC%

---++ Project Overview <!-- @page { margin: 2cm } P { margin-bottom: 0.21cm } P.western { so-language: en-GB } A:link { so-language: zxx } -->
---+++ Project Aim

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 &rarr; b bbar decay mode, as this has the highest branching ratio for a Higgs of mass around 120 GeV as discovered at CERN.


[[https://ppes8.physics.gla.ac.uk/twiki/pub/LinearCollider/GMProjectProgress/Murdoch_Gavin_0900886_InterimReport.pdf][Project Interim Report]]

---+++ Invariant Mass of Higgs (MC simulated events)

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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 &rarr; 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:

[[https://ppes8.physics.gla.ac.uk/twiki/pub/LinearCollider/GMProjectProgress/plot_gaus_limits_100_147.png][H &rarr; b bbar with Gaussian fit]]

[[https://ppes8.physics.gla.ac.uk/twiki/pub/LinearCollider/GMProjectProgress/cplot_gaus_limits_105_154.png][H &rarr; 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 &ldquo;true&rdquo; 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

   * [[http://cds.cern.ch/record/1499128?ln=en][Light Higgs Production and Decays to Pairs of Bottom and Charm Quarks at 3 TeV]]

Attachments

Topic attachments
I	Attachment	History	Action	Size	Date	Who	Comment
pdf	Murdoch_Gavin_0900886_InterimReport.pdf	r1	manage	86.4 K	2013-02-13 - 12:06	GavinMurdoch	Higgs Properties Interim Report
ps	b_jet_mass50000.ps	r1	manage	9.7 K	2013-02-01 - 18:40	GavinMurdoch	b jet mass from 50000 events
ps	c_jet_mass50000.ps	r1	manage	9.0 K	2013-02-01 - 18:40	GavinMurdoch	c jet mass from 50000 events
png	cplot_gaus_limits_105_154.png	r1	manage	19.9 K	2013-02-13 - 11:50	GavinMurdoch	Invariant Mass of Higgs (H->cc)
png	plot_gaus_limits_100_147.png	r1	manage	23.5 K	2013-02-13 - 11:49	GavinMurdoch	Invariant Mass of Higgs (H->bb)

Topic revision: r4 - 2013-02-13 - GavinMurdoch

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