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--- 2015:groups:higgs:morehiggs:lowmassdiphoton [2015/06/13 21:28]
werner.porod
+++ 2015:groups:higgs:morehiggs:lowmassdiphoton [2015/06/18 15:43] (current)
camilo.carrillo
@@ Line 1: / Line 1: @@
+====== Low Mass Higgs -> gamma gamma ======
 {{2015:groups:higgs:morehiggs:selection_538.png|The logo of DokuWiki}}
@@ Line 16: / Line 18: @@
 |Porod|Werner|10-juin-15|19-juin-15|
 |Sabes|David|10-juin-15|19-juin-15|
-References:
+===== References =====
   * [[http://journals.aps.org/prl/pdf/10.1103/PhysRevLett.113.171801|ATLAS (65->600) exclusion ]], [[https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2014-04/|(figures)]]
@@ Line 27: / Line 30: @@
   * [[http://arxiv.org/pdf/1408.1120v1.pdf| Discovery Prospects for NMSSM Higgs Bosons]]
   * [[http://arxiv.org/pdf/1408.1704v1.pdf| scenario with light pseudoscalar in NMSSM]]
+  * [[http://cp3.irmp.ucl.ac.be/projects/delphes|Delphes main page]]
+===== Information/How to install Delphes =====
+== How to run Delphes on an LHE file using Pythia for showering ==
+Installation steps and commands (to perform as superuser on your machine):
+  - Download HepMC from here [[http://lcgapp.cern.ch/project/simu/HepMC/download/HepMC-2.06.09.tar.gz]].
+  - Download the latest Pythia8 from here [[http://home.thep.lu.se/~torbjorn/pythia8/pythia8209.tgz]]
+  - Download Delphes from here [[http://cp3.irmp.ucl.ac.be/downloads/Delphes-3.2.0.tar.gz]]
+To intall HepMC
+      tar -xvf HepMC-2.06.09.tar.gz
+      cd HepMC-2.06.09/
+      ./configure --with-gzip --enable-shared --with-momentum=GEV --with-length=CM
+      make
+      make install
+To install Pythia8
+      tar -xvf pythia8209.tgz
+      cd pythia8209
+      ./configure --enable-shared --with-hepmc2=$complete path$/HepMC-2.06.09
+      make
+      make install
+To install Delphes
+      tar -xvf Delphes-3.2.0.tar.gz
+      cd Delphes-3.2.0/
+      ./configure --with-gzip --enable-shared --prefix=/home/miloc/delphes/pythia/
+      export PYTHIA8=$complete path$/pythia8209
+      export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$complete path$/pythia8209/lib
+      make HAS_PYTHIA8=true DelphesPythia8
+Build your pythia card, this is an example for H->gg, note that the input lhe file is defined here
+      Main:numberOfEvents = 100000
+      Beams:frameType = 4
+      Beams:LHEF = /home/miloc/lhe/h125SM.lhe
+:onMode = off
+:onIfMatch = 22 22
+Finally to run Delphes, do
+      ./DelphesPythia8 detectorcard.tcl pythiasettings.in output.root
+For the detector card, you can use the one in Delphes-3.2.0/cards/ \\
+For the pythiasettings, there is a working example below (which you can just store in a text file) \\
+(you will need to specify a .lhe file. You can find some in the following links)
+==hhxx==
+  * wget https://test-carrillo.web.cern.ch/test-carrillo/higgs/lhe/Higgs_hhxx_scalar_nohdecay_1000GeV_13TeV.lhe.gz.orig
+  * wget https://test-carrillo.web.cern.ch/test-carrillo/higgs/lhe/Higgs_hhxx_scalar_nohdecay_100GeV_13TeV.lhe.gz.orig
+  * wget https://test-carrillo.web.cern.ch/test-carrillo/higgs/lhe/Higgs_hhxx_scalar_nohdecay_10GeV_13TeV.lhe.gz.orig
+  * wget https://test-carrillo.web.cern.ch/test-carrillo/higgs/lhe/Higgs_hhxx_scalar_nohdecay_1GeV_13TeV.lhe.gz.orig
+  * wget https://test-carrillo.web.cern.ch/test-carrillo/higgs/lhe/Higgs_hhxx_scalar_nohdecay_500GeV_13TeV.lhe.gz.orig
+''
+Main:numberOfEvents = 1000\\
+Beams:frameType = 4\\
+Beams:LHEF = $complete path$/yourfile.lhe.gz.orig\\
+''
+To fix the decays of the Higgs, you have to add the following to the above pythia input card:\\
+**In case of H->gamma gamma**\\
+''
+:onMode = off\\
+:onIfMatch = 22 22\\
+''
+**In case of H -> ZZ -> 4l**\\
+''
+:onMode = off\\
+:onIfMatch = 23 23\\
+:onMode = off\\
+:onIfAny = 11 13 15
+''
+===== Meetings =====
 First Meeting (Chat)Doodle:
@@ Line 40: / Line 112: @@
 |Porod|Werner|||||
 |Sabes|David|X|X|X|X|
+=== Meeting 1: Friday 12th at 14:30 ===
 The first Meeting took place Friday 12 at 14:30 in the QCD room (main auditorium->left) marked as (Organisers)
@@ Line 47: / Line 121: @@
 {{:2015:groups:higgs:morehiggs:2015-06-12_15.36.28.jpg?200|}}
+We have 3 theoretical models (frameworks) where our final state is applicable:
+====Theory 1====
+Werner: in the NMSSM the lightest neutralinos/chargino can be mainly the MSSM higgsinos.
+In case of a large singlet-doublet couplings, one gets sizable cross section for
+pp -> chi chi H_1. Here chi chi is the summation over all higgsinos which are mass degenerate within a few
+GeV.
+The second interesting process ist pp -> H_3 -> H_1 H_1 where the H_3 is the heaviest neutral Higgs boson.
+The third is pp -> t t -> W b H+ b where H+ decays into W H_1 and the later to gamma gamma.
+====Theory 2====
+Ulrich:
+{{:2015:groups:higgs:morehiggs:benchmark_point_b1_nmssm_from_arxiiv.jpg|}}
+====Theory 3====
+Giacomo and Aldo
+The model consists of a scalar which is pair produced by gauge interactions: qq -> H' H', and VBF -> H' H'. At low mass, the kinematically allowed decays are: W gamma (charged) and gamma gamma (neutral).
+We can start considering a triplet of SU(2)L, with production channels H'+ H'-, and H'+ H'0. We will create a MG file asap.
+A sample model, with a singlet decaying in VV (but not gamma gamma): [[http://arxiv.org/abs/1502.04718|1502.04718]]. More references to follow soon.
+====Experiment====
+ATLAS: Nicolas
+CMS: Camilo Benoit David
+We are implementing a reliable model of CMS in DELPHES, the input of our software would be lhe files, the decay of the higgs can be done by us as well.... work is ongoing.
+=== Meeting 2: Tuesday 16th at 10:00 ===
 The second Meeting takes place Tuesday 16th at 10:00 in the QCD room (main auditorium->left) marked as (Organisers)
+=== Meeting 3: Wednesday 17th at 14:30 ===
+Preparation of the summary slides, based on your inputs in this twiki
+Presentation draft:
+http://test-carrillo.web.cern.ch/test-carrillo/tmp/lhe.pdf

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