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2015:groups:higgs:morehiggs:lowmassdiphoton [2015/06/12 15:52] aldo.deandrea |
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/1207.1096v1.pdf|(N)MSSM with H2=H125]] | * [[http://arxiv.org/pdf/1207.1096v1.pdf|(N)MSSM with H2=H125]] | ||
* [[http://lpsc.in2p3.fr/projects-th/lilith/|Lilith page]] | * [[http://lpsc.in2p3.fr/projects-th/lilith/|Lilith page]] | ||
+ | * [[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 | ||
+ | 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 | ||