Simulation of the pMSSM Simulation of the pMSSM The pMSSM What is - - PowerPoint PPT Presentation

LHEP, Benjamin Gerber 01.03.2013 1

Simulation of the pMSSM Simulation of the pMSSM

• The pMSSM
• What is needed?
• Procedure
• Outlook

LHEP, Benjamin Gerber 01.03.2013 2

The pMSSM The pMSSM

• pMSSM: phenomenological Minimal Supersymmetric Model
• Due to some constraints “just” 19 free parameters, compared

with the more than 100 of the unconstrained MSSM.

• [For completeness:]
• Constraints:
• R-parity is conserved (→ LSP, Neutralino or Gravitino, is stable).
• No new CP-violation source (all phases of soft-SUSY breaking

potential are zero, just CKM-matrix leads to CP-violation).

• No flavour changing neutral currents.
• First and second generation sleptons and squarks with same

quantum- numbers taken to be degenerate → have negligible Yukawa couplings.

LHEP, Benjamin Gerber 01.03.2013 3

What is needed? What is needed?

• My set of programs:

– SUSPECT2: to generate the pMSSM mass-spectrum – SUSY-HIT: to include the branching ratios – SuperIso: to validate the created models – Herwig++(/Pythia): MC-simulation of pp-collision – Delphes: MC-simulation of the ATLAS detector – [HepMC: package for eventrecording] – [ThePeg: toolkit for event generation]

LHEP, Benjamin Gerber 01.03.2013 4

Procedure Procedure

• Schematic for one model:

Suspect2: Creates mass spectrum in pMSSM-model.slha Herwig++(/Pythia): Does a MC-simulation out of the pMSSM-model.slha file and creates a *.hepmc file with all the decay-products. SuperIso: Checks upon few different observables if the pMSSM-model.slha is valid or not. SUSY-HIT: Includes BR's and matrix-elements into pMSSM-model.slha Delphes: Simulates the ATLAS-detector and creates a *.root file out

• f the *.hepmc file.

Feed in the 19 parameters

• f the pMSSM.

LHEP, Benjamin Gerber 01.03.2013 5

Procedure Procedure

• Schematic for one model:

Suspect2: Creates mass spectrum in pMSSM-model.slha Herwig++(/Pythia): Does a MC-simulation out of the pMSSM-model.slha file and creates a *.hepmc file with all the decay-products. SuperIso: Checks upon few different observables if the pMSSM-model.slha is valid or not. SUSY-HIT: Includes BR's and matrix-elements into pMSSM-model.slha Delphes: Simulates the ATLAS-detector and creates a *.root file out

• f the *.hepmc file.

To do:

• Write Python codes to:
• create arbitrary much models and check them on

validity due to the Higgs mass (Suspect2 and SUSY-Hit)

• check validity due to other parameters (SuperIso)
• ceate a hepmc-file for each valid pMSSM model

(Herwig++/Pythia) to feed it to Delphes to create root files. [- Write a CINT code for some analysis.]

LHEP, Benjamin Gerber 01.03.2013 6

Outlook Outlook

• Search&implementation of the most recent constraints
• Simulation of “few 1000” events for each of the “few

1000” valid pMSSM-models with pp collisions of 13 TeV

• Analysis

___________________________________________ |____________________|______________________|

LHEP, Benjamin Gerber 01.03.2013 7

To be continued... To be continued...