SPICE: Simulation Package for Including Flavor in Collider Events Felix Yu University of California, Irvine G. Engelhard, J.L. Feng, I. Galon, D. Sanford, FY, arXiv: 0904:1415v1 [hep-ph] J.L. Feng, I. Galon, D. Sanford, Y. Shadmi, FY, arXiv: v1 [hep-ph]

West Coast LHC Theory Meeting, April 17, The Standard Model Flavor Problem and Beyond Theorist’s motivation for flavor studies – SM flavor problem – If new physics is seen at the LHC, have to also address new physics flavor puzzle – Can create and test new models which explain some of these outstanding issues Experimentalist’s motivation – Minimal flavor-violating models are simple, but new physics is not necessarily simple – Flavor-violating new physics could be easier to see than flavor-conserving version Enter SPICE

West Coast LHC Theory Meeting, April 17, What is SPICE? SPICE is a simulation tool for lepton flavor studies – takes a flavor-conserving minimal SUSY model – adds flavor-violating parameters – outputs the SUSY spectrum and lepton flavor- general branching ratios – relies upon SOFTSUSY and SUSYHIT Output (in Herwig, SLHA, and SLHA2 formats) is ready for use in your favorite Monte Carlo event generator

West Coast LHC Theory Meeting, April 17, mSUGRA mGMSB “Spine” mAMSB What is SPICE? Flavor-violating parameters (U(1) charges or user-defined) SPICE SUSY spectrum and flavor-general decay widths

West Coast LHC Theory Meeting, April 17, Yet Another Simulation Package? Most all simulation packages (ISAJET, CompHEP, MadGraph) typically adopt MSSM and other minimal SUSY models as standard – Currently, adopting a non-minimal model requires customization via LanHEP (for CompHEP) or FeynRules (for MadGraph) Our program allows for an explanation of flavor observables via U(1) flavor models Feng, Lester, Nir, Shadmi (2007) Froggatt, Nielsen, Ibanez, Ross, Nir, Seiberg, Anderson, Raby, Dimopoulos, Hall, Starkman…

West Coast LHC Theory Meeting, April 17, LHC Applications Could generically get lots of new low-energy signatures which can be clean and easily measurable – The nature of the NLSP and the light SUSY particle decays dictates the difficulties and efficiencies of reconstruction Will now focus on models with slepton NLSPs – Gravitino is LSP, slepton NLSP escapes the detector – Reasonable, easier than bino NLSP case, and interesting on its own

West Coast LHC Theory Meeting, April 17,

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9 Flavor-Violating Slepton NLSP Model

West Coast LHC Theory Meeting, April 17, FC Three-Body Decay Modes in Models with Slepton NLSPs Previous work on three-body slepton decays was restricted to flavor-conserving models – Studies using flavor-conserving models ensure that taus are ubiquitous - R ~–~– 11 ~-   ~ R ~–~– -  11 ~ +  ~ Charge-preserving Charge-flipping Ambrosanio, Kribs, Martin (1997)

West Coast LHC Theory Meeting, April 17, FV Three-Body Decay Modes in Models with Slepton NLSPs With flavor violation, lots of modes open up and many different lepton combinations are possible Three-Body Modes Included in SPICE Charge-preservingCharge-flipping ~–~– -  ~ - ~+~+ ~–~– -  ~ - ~+~+ - ~–~–  ~ + ~–~– - ~–~–  ~ + ~–~– - ~–~– H ,q ~–~– +,q – - ~–~– Z ,q,q ~–~– +,  q –– Feng, Galon, Sanford, Shadmi, FY (2009)

West Coast LHC Theory Meeting, April 17, Cascade Decays 4-6 ~ 2-3 ~ 1 ~ ( ) An optimistic scenario for SUSY with a slepton NLSP – Lots of leptons, and especially interesting with flavor violation

West Coast LHC Theory Meeting, April 17, Reconstructing Decay Chain Truth masses (in GeV) for a different FV slepton NLSP model Can we see flavor-violation at early stages of reconstruction? – reconstruction of slepton NLSP should be straightforward

West Coast LHC Theory Meeting, April 17, Flavor Information in the Bino Reconstruction? Invariant mass of 1 e and 1  after cut on p T Preliminary, Work in Progress  

West Coast LHC Theory Meeting, April 17, Flavor Information in the Bino Reconstruction? Zooming in on the hard-p T cut plots Preliminary, Work in Progress

West Coast LHC Theory Meeting, April 17, Questions to Consider Can we distinguish ~5-10 GeV mass splittings? Can we measure mixings with early LHC data? What are the easy signatures of flavor- violating models? – Do not necessarily have lots of taus, for example

West Coast LHC Theory Meeting, April 17, Conclusions SPICE is a timely, useful application to help with lepton flavor studies – completely general Download it from Future work – inclusion of squark flavor mixing – calculation of low-energy constraints

West Coast LHC Theory Meeting, April 17,

Backup Slides

West Coast LHC Theory Meeting, April 17, Flavor-Conserving Bino NLSP Model

West Coast LHC Theory Meeting, April 17, Flavor-Conserving Bino NLSP Model Light higgs Heavy, Pseudoscalar Higgs Charged Higgs Left d, s Left u, c Light b Light t Right d, s Right u, c Heavy b Heavy t Gluino Neut Neut Neut Neut Slep Slep Slep Slep Slep Slep Snu Snu Snu Char Char

West Coast LHC Theory Meeting, April 17, Flavor-Violating Bino NLSP Model

West Coast LHC Theory Meeting, April 17, Flavor-Violating Bino NLSP Model

West Coast LHC Theory Meeting, April 17, Flavor-Violating Bino NLSP Model Light higgs Heavy, Pseudoscalar Higgs Charged Higgs Left d, s Left u, c Light b Light t Right d, s Right u, c Heavy b Heavy t Gluino Neut Neut Neut Neut Slep Slep Slep Slep Slep Slep Snu Snu Snu Char Char

West Coast LHC Theory Meeting, April 17, Flavor-Conserving Slepton NLSP Model Light higgs Heavy, Pseudoscalar Higgs Charged Higgs Left d, s Left u, c Light b Light t Right d, s Right u, c Heavy b Heavy t Gluino Neut Neut Neut Neut Slep Slep Slep Slep Slep Slep Snu Snu Snu Char Char

West Coast LHC Theory Meeting, April 17, Flavor-Violating Slepton NLSP Model Light higgs Heavy, Pseudoscalar Higgs Charged Higgs Left d, s Left u, c Light b Light t Right d, s Right u, c Heavy b Heavy t Gluino Neut Neut Neut Neut Slep Slep Slep Slep Slep Slep Snu Snu Snu Char Char

West Coast LHC Theory Meeting, April 17, † † Flavor-Violating Parameters