====== Low Mass Higgs -> gamma gamma ====== {{2015:groups:higgs:morehiggs:selection_538.png|The logo of DokuWiki}} *Responsible:* Camilo Carrillo *Members:* Benoit Courbon, David Sabes, Giacomo Cacciapaglia, Aldo Deandrea, Nicolas Berger, Werner Porod, Ulrich Goerlach, Susan Gascon ^Nom de Famille^Prénom^Jour Arrivée^Jour Départ^ |Berger|Nicolas|10-juin-15|19-juin-15| |Cacciapaglia|Giacomo|10-juin-15|19-juin-15| |Carrillo|Camilo|10-juin-15|19-juin-15| |Courbon|Benoit|10-juin-15|19-juin-15| |Deandrea|Aldo|10-juin-15|19-juin-15| |Gascon|Susan|10-juin-15|19-juin-15|[ |Goerlach|Ulrich|10-juin-15|19-juin-15| |Porod|Werner|10-juin-15|19-juin-15| |Sabes|David|10-juin-15|19-juin-15| ===== 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://arxiv.org/abs/1309.6394|IPNL-Pheno NMSSM]] * [[http://arxiv.org/abs/1311.5132|IPNL-Parameterisation for a lighter higgs]] * [[http://arxiv.org/pdf/hep-ex/0306033.pdf|LEP excess]] * [[http://www.th.u-psud.fr/NMHDECAY/nmssmtools.html|NMSSM Tools homepage]] * [[http://arxiv.org/pdf/1207.1096v1.pdf|(N)MSSM with H2=H125]] * [[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: ^Nom^Prénom^Friday 11am^Friday 14:30^Friday 16:00^Friday 18:00^ |Berger|Nicolas|X|X||| |Cacciapaglia|Giacomo|No|Yes|Yes|Yes| |Carrillo|Camilo|X|X|X|X| |Courbon|Benoit|X|X|X|X| |Deandrea|Aldo||X|X|| |Gascon|Susan|X|X||| |Goerlach|Ulrich|X|X||X| |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) {{:2015:groups:higgs:morehiggs:2015-06-12_15.15.20.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) === 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