MoragWilliamsMSciProjectWiki < LinearCollider

---+ Morag Williams: MSci Project Wiki

*Project Title: Sensitivity to beyond Standard Model physics through Higgs production at CLIC using effective field theories. Supervisor: Aidan Robson.*

*In Progress.*
---++ MADGRAPH Generating Steps

All using MADGRAPH 2.4.3, which requires Python 2.6 or 2.7. Using the Higgs Effective Lagrangian (HEL) Universal FeynRules Output (UFO) model which can be found here: https://feynrules.irmp.ucl.ac.be/wiki/HEL.

1) Start MADGRAPH:

=cd MG5_aMC_v2_4_3/bin/=

=./mg5_aMC=

This opens the MADGRAPH5_ aMC @ NLO interface.

2) Import the HEL_UFO model (which needs to have been copied to your models directory):

=import model HEL_UFO=

3) Generate electron + positron -&gt; Higgs + electron + positron events, with a new physics parameter and QED type stated.

<span> =generate e+ e- &gt; h e+ e- QED=4 NP=1= </span>

<span>^^ Note: the order of e+ and e- here defines the incoming beam directions; do this ordering for a +ve positron pseudorapidity.<br /></span>

4) Write to output directory of name ee_hee2

=output ee_hee2=

=quit=

5) Travel to the new directory /bin/ee_hee2 and change the run card parameters as needed in file Cards/run_card.dat.

6) Start the MadEvent interface and generate events with the run card parameters specified in run_card.dat.

=cd /ee_hee2/bin/=

=./madevent=

=generate_events=

This will open a web page showing the generation progress and main parameters (such as the particle interaction and beam energies), and create an output file unweighted_events.lhe.gz in Events/run_01. A file run_01_tag_1_banner.txt is also created in /Events/run_01 listing all commands used in the MADGRAPH and MadEvent interfaces and all run card parameters used.

---++ ETA Graphs for different EFT parameters

The default value for the coefficients is 0.1.

Graph of the positron pseudorapidity for two values of cHW: the blue line is for cHW=0.05, the red line is cHW=0.1. 10,00 events were used and the cross sections were 1.36828 pb and 1.63987 pb respectively (to 6 significant figures).

[[%ATTACHURLPATH%/pseudorap_ep_comparisoncHW_0.05_0.1.pdf][pseudorap_ep_comparisoncHW_0.05_0.1.pdf]]

Graph of the electron pseudorapidity for two values of cHW: blue line is 0.05, the red line is 0.1. 10,00 events were used and the cross sections were 1.36828 pb and 1.63987 pb respectively (to 6 significant figures).

[[%ATTACHURLPATH%/pseudorap_em_comparisoncHW_0.05_0.1.pdf][pseudorap_em_comparisoncHW_0.05_0.1.pdf]]

Graph of the positron pseudorapidity for three values of cWW: the blue line is for cWW=0.05, the red line is cWW=0.1, and the green line is cWW=0.075. 10,00 events were used and the cross sections were 1.31255 pb, 1.46576 pb, and 1.63987 pb respectively (to 6 significant figures).

[[%ATTACHURLPATH%/pseudorap_ep_comparisoncWW_0.05_0.1_0.075.pdf][pseudorap_ep_comparisoncWW_0.05_0.1_0.075.pdf]]

Graph of the electron pseudorapidity for three values of cWW: the blue line is for cWW=0.05, the green line is cWW=0.075, and the red line is cWW=0.1. 10,00 events were used and the cross sections were 1.31255 pb, 1.46576 pb and 1.63987 pb respectively (to 6 significant figures).

[[%ATTACHURLPATH%/pseudorap_em_comparisoncWW_0.05_0.1_0.075.pdf][pseudorap_em_comparisoncWW_0.05_0.1_0.075.pdf]]

-- %USERSIG{MoragWilliams - 2016-11-07}%
---++ Comments

%COMMENT%

Attachments

Topic attachments
I	Attachment	History	Action	Size	Date	Who	Comment
pdf	pseudorap_em_comparisoncHW_0.05_0.1.pdf	r1	manage	14.5 K	2016-11-14 - 14:45	MoragWilliams	pseudorap_em_comparisoncHW_0.05_0.1.pdf
pdf	pseudorap_em_comparisoncWW_0.05_0.1_0.075.pdf	r1	manage	14.9 K	2016-11-14 - 14:33	MoragWilliams	pseudorap_em_comparisoncWW_0.05_0.1_0.075.pdf
pdf	pseudorap_ep_comparisoncHW_0.05_0.1.pdf	r1	manage	14.3 K	2016-11-14 - 14:45	MoragWilliams	pseudorap_ep_comparisoncHW_0.05_0.1.pdf
pdf	pseudorap_ep_comparisoncWW_0.05_0.1_0.075.pdf	r1	manage	15.0 K	2016-11-14 - 14:33	MoragWilliams	pseudorap_ep_comparisoncWW_0.05_0.1_0.075.pdf

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Topic revision: r3 - 2016-11-14 - MoragWilliams