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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: 0904.1416v1 [hep-ph]

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West Coast LHC Theory Meeting, April 17, 2009 2 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

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West Coast LHC Theory Meeting, April 17, 2009 3 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

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West Coast LHC Theory Meeting, April 17, 2009 4 mSUGRA mGMSB “Spine” mAMSB What is SPICE? Flavor-violating parameters (U(1) charges or user-defined) SPICE SUSY spectrum and flavor-general decay widths

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West Coast LHC Theory Meeting, April 17, 2009 5 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…

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West Coast LHC Theory Meeting, April 17, 2009 6 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

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West Coast LHC Theory Meeting, April 17, 2009 7

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9 Flavor-Violating Slepton NLSP Model

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West Coast LHC Theory Meeting, April 17, 2009 10 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 ~–~– 11 ~- ~ R ~–~– - 11 ~ + ~ Charge-preserving Charge-flipping Ambrosanio, Kribs, Martin (1997)

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West Coast LHC Theory Meeting, April 17, 2009 11 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)

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West Coast LHC Theory Meeting, April 17, 2009 12 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

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West Coast LHC Theory Meeting, April 17, 2009 13 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

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West Coast LHC Theory Meeting, April 17, 2009 14 Flavor Information in the Bino Reconstruction? Invariant mass of 1 e and 1 after cut on p T Preliminary, Work in Progress

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West Coast LHC Theory Meeting, April 17, 2009 15 Flavor Information in the Bino Reconstruction? Zooming in on the hard-p T cut plots Preliminary, Work in Progress

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West Coast LHC Theory Meeting, April 17, 2009 16 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

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West Coast LHC Theory Meeting, April 17, 2009 17 Conclusions SPICE is a timely, useful application to help with lepton flavor studies – completely general Download it from http://hep.ps.uci.edu/~spice Future work – inclusion of squark flavor mixing – calculation of low-energy constraints

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Backup Slides

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West Coast LHC Theory Meeting, April 17, 2009 20 Flavor-Conserving Bino NLSP Model

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West Coast LHC Theory Meeting, April 17, 2009 21 Flavor-Conserving Bino NLSP Model Light higgs109.4505 Heavy, Pseudoscalar Higgs494.3590 Charged Higgs500.7804 Left d, s837.4747 Left u, c830.4740 Light b782.0099 Light t686.9815 Right d, s793.4322 Right u, c796.2180 Heavy b794.6305 Heavy t810.8433 Gluino780.7523 Neut1131.0896 Neut2246.6087 Neut3415.8810 Neut4436.3886 Slep1147.4091 Slep2152.9753 Slep3152.9897 Slep4287.0535 Slep5287.1140 Slep6287.7173 Snu1275.3281 Snu2275.7312 Snu3275.7325 Char1246.7770 Char2438.3474

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West Coast LHC Theory Meeting, April 17, 2009 22 Flavor-Violating Bino NLSP Model

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West Coast LHC Theory Meeting, April 17, 2009 23 Flavor-Violating Bino NLSP Model

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West Coast LHC Theory Meeting, April 17, 2009 24 Flavor-Violating Bino NLSP Model Light higgs109.4327 Heavy, Pseudoscalar Higgs495.5477 Charged Higgs501.9262 Left d, s837.3721 Left u, c830.3876 Light b781.8474 Light t687.4050 Right d, s793.1978 Right u, c796.6701 Heavy b794.4472 Heavy t810.8499 Gluino780.7551 Neut1131.2707 Neut2246.7691 Neut3416.5810 Neut4437.0140 Slep1191.0296 Slep2197.7382 Slep3203.8811 Slep4267.1493 Slep5289.6940 Slep6309.8771 Snu1253.7412 Snu2277.8040 Snu3299.4458 Char1246.9317 Char2438.9892

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West Coast LHC Theory Meeting, April 17, 2009 25 Flavor-Conserving Slepton NLSP Model Light higgs111.7324 Heavy, Pseudoscalar Higgs567.0095 Charged Higgs573.7404 Left d, s1112.511 Left u, c1104.877 Light b1058.835 Light t963.7986 Right d, s1071.065 Right u, c1073.026 Heavy b1070.766 Heavy t1081.010 Gluino1285.116 Neut1238.1757 Neut2416.1312 Neut3477.5750 Neut4536.9010 Slep1152.9594 Slep2159.9425 Slep3159.9555 Slep4320.8758 Slep5322.8931 Slep6322.9183 Snu1312.5524 Snu2312.8549 Snu3312.8559 Char1416.8510 Char2536.9010

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West Coast LHC Theory Meeting, April 17, 2009 26 Flavor-Violating Slepton NLSP Model Light higgs111.6894 Heavy, Pseudoscalar Higgs567.5025 Charged Higgs574.1964 Left d, s1112.478 Left u, c1104.863 Light b1058.783 Light t963.9231 Right d, s1070.985 Right u, c1073.174 Heavy b1070.698 Heavy t1081.022 Gluino1285.116 Neut1238.2914 Neut2416.3343 Neut3477.8518 Neut4536.5364 Slep1180.9873 Slep2186.4298 Slep3191.048 Slep4302.838 Slep5323.498 Slep6343.3143 Snu1292.7925 Snu2314.1631 Snu3333.9243 Char1417.0538 Char2537.1004

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West Coast LHC Theory Meeting, April 17, 2009 27 † † Flavor-Violating Parameters

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