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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
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 +====== Low Mass Higgs -> gamma gamma ======
 +
 {{2015:​groups:​higgs:​morehiggs:​selection_538.png|The logo of DokuWiki}} {{2015:​groups:​higgs:​morehiggs:​selection_538.png|The logo of DokuWiki}}
  
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 |Porod|Werner|10-juin-15|19-juin-15| |Porod|Werner|10-juin-15|19-juin-15|
 |Sabes|David|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)]]   * [[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)]]
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   * [[http://​arxiv.org/​pdf/​1408.1120v1.pdf| Discovery Prospects for NMSSM Higgs Bosons]]   * [[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://​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
 +      25:onMode = off
 +      25:​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**\\
 +''​
 +25:onMode = off\\
 +25:​onIfMatch = 22 22\\
 +''​
 +**In case of H -> ZZ -> 4l**\\
 +''​
 +25:onMode = off\\
 +25:​onIfMatch = 23 23\\
 +23:onMode = off\\
 +23:onIfAny = 11 13 15
 +''​
 +===== Meetings =====
 First Meeting (Chat)Doodle:​ First Meeting (Chat)Doodle:​
  
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 |Porod|Werner||||| |Porod|Werner|||||
 |Sabes|David|X|X|X|X| |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) The first Meeting took place Friday 12 at 14:30 in the QCD room (main auditorium->​left) marked as (Organisers)
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 {{:​2015:​groups:​higgs:​morehiggs:​2015-06-12_15.36.28.jpg?​200|}} {{:​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) 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
 +
2015/groups/higgs/morehiggs/lowmassdiphoton.1434223699.txt.gz · Last modified: 2015/06/13 21:28 by werner.porod