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Supersymmetry Searches and its implications

Supersymmetry Searches and its implications. Monoranjan Guchait TIFR, Mumbai. From Strings to LHC III 8-14 th December , 2012 Puri. Outline. Introduction: SUSY Results from LHC Constraining SUSY models Future. Outline. Introduction: SUSY Results from LHC

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Supersymmetry Searches and its implications

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  1. Supersymmetry Searches and itsimplications MonoranjanGuchait TIFR, Mumbai From Strings to LHC III 8-14th December, 2012 Puri

  2. Outline Introduction: SUSY Results from LHC Constraining SUSY models Future

  3. Outline Introduction: SUSY Results from LHC Constraining SUSY models Future Apologies to, whose work is not referred/discussed

  4. Why SUSY Stabilization of Higgs Mass Coupling unification Neutrino Mass Dark Matter

  5. The MSSM: particle content Play important role In collider searches Discovery of Charged Higgs ..an unambigoous signal for NP Couplings are parameter space dependent

  6. ~ m(e) ≠ m(e) SUSY is not exact SUSY has to be broken Supersymmetry: A broken Symmetry Soft Mass terms: Origin of these mass terms are yet to be understood 100+ parameters

  7. SUSY breaking SSB is done using MSSM fields: Not supported by Expt!!. Mass scale M Softmasses~ F/M ~ 1 TeV Mass scale F Gravity mediation Gauge mediation Gaugino mediation Anomaly mediation

  8. mSUGRA/CMSSM SUSY breaking is mediated by Gravitational interaction Breaking scale ~1010 GeV Model defined by: m0, m1/2, A 0, tanβ and sign(µ) RG Low Energy masses and couplings spectrum FCNC natural EWSB is automatic

  9. Mass Matrices 3rd Generation mass matrices Chargino mass matrices is a 2X2 mass matrices: Neutralino mass matrices is a 4X4 mass matrices:

  10. Mass Pattern MSUGRA mGMSB Phenomenology is different mAMSB

  11. SUSY at the LHC

  12. SUSY particle production at the LHC Strongly interacting particles, like squarks and gluinos are produced dominantly. 8 TeV Gluino+Gluino M ̴ 1 TeV σ ̴0.2-0.3 pb stop+stop Gluinos and Squarks cascade through lighter particles. Signatures are very diverse.

  13. SUSY signals in Colliders At the LHC, gluinos and squarks are produced domminantly ~ ∆m Model Dependence ~ q W/Z ∆m Model Dependence W/Z Leptons+photons+jets+Missing energy,

  14. Inclusive signals Gluino/Squark + Gaugino cascade 0 lepton + jets + MET Gluino/Squark + leptonic decay Gaugino/slepton 1 lepton + jets + MET 2 leptons(SS/OS))+jets+MET Gluino/Squark cascade in GMSB model Lepton(e,μ,τ) + jets + MET photon+MET Rates ̴ production cross section X BR

  15. Signal and Backgrounds SM Bg cross sections are: (7 TeV) Missing transeverse energy(MET) Cuts are used: → Razor + b-tagging

  16. Results from CMS and ATLAS

  17. Squark and Gluino Searches mSUGRA/CMSSM 2011 searches by CMS CMS M(gluino) > 1. TeV Otherwise, m(gluino) ̴̴ 820 GeV

  18. Simplified Model Spectra(SMS) T1tttt

  19. SMS summary Plots 7 TeV, <4.98/fb Exclusion limit: m(mother)-m(LSP)=0 and 200GeV m(gluino) ̴ 1 TeV, excl

  20. Chargino and Neutralino Production If colored sparticles are very heavy, then looking for Gauginos is another way to find SUSY Productions are mediated by mostly quark and anti-quark Annihilation, pure EW interactions, Cross sections are expected to be low M(chargino) ̴ 400 GeV, c.s ̴ 10 fb

  21. Chargino- Neutralino Searches 3 leptons + MET, no jets W/Z/slepton 4 leptons + MET, no jets

  22. Chargino and Neutralino: 3 lepton tau enrich final states

  23. Chargino, Neutralino, Slepton Searches: Summary CMS 3 leptons, four leptons, two SS,OSSF,+2 jets, two non-resonant (OS) m(C1) ̴ m(N2) >650 GeV If M(LSP) ̴ GeV and BF(l+l-)=0.5

  24. SUSY particle production Stop pairs are produced via strong interaction Stop pair production 500 GeV stop mass ̴ 100 fb

  25. Stop: Signal Gluino mediated, Direct Production Many b jets in the final states,

  26. Stop Search: Gluino mediated 8 TeV, L=12.8/fb 1.2 TeV ATLAS

  27. Direct stop production jets, leptonic channels ATLAS Work in progress to increase sensitivity

  28. Direct stop production at CMS

  29. Direct Sbottom Production

  30. Photons+MET Photons can be reconstructed and identified with high purity -> clean experimental signature Gauge mediation is one of the SUSY model where SUSY breaking Is transmitting SUSY breaking to MSSM Gravitino LSP Biggest Bg: QCD jets fake as photon

  31. Single photon+MET+jets

  32. Di-photon

  33. Constraining SUSY

  34. Energy Cosmic Luminosity

  35. Constraints on NP Flavour Physics SM Value: LHCb value:

  36. Flavour Physics Bs->s + gamma

  37. Cosmic Connection:Dark Matter SM cannot offer a Dark Matter candidate Lightest Neutralino is a DM candidate

  38. SUSY Higgs bounds MA<200, tanβ<10 MA>200, tanβ is large MA<140 GeV=> MH+< 160 GeV

  39. Higgs Mass Discovery CMS ATLAS

  40. Higgs Mass and 3rd Generation At the tree level, Higgs mass, Loop level, Higgs mass is sensitive to stop mass, maximized for maximal mixings: Accurate loop calculation is needed to determine stop masses for 125 GeV Higgs.

  41. Higgs in MSSM SuSpect and FeynHiggs has disagreement Large top squark mixing leads to lower and more natural top squark mass In maximal mixings Needs stop mass heavier than the current bound.

  42. Higgs mass and FT Heavy stop mass are required to boost Higgs mass to 125 GeV. In SUSY theories, Top-stops-Higgs loop, Right hand side needs some tuning to achieve the correct scale of EWSB

  43. Fine tuning The amount of FT is determined by the size of the Higgs mass relative to the size of corrections to the quadratic term of potential. The fine tuning parameter:

  44. Fine Tuning Hall, `11, Nomura ,`06.. Λ=10 TeV FT >100(200) for Xt <0(>0) Stop mass can be as low as 500 GeV at maximal mixings

  45. FT: Spectrum

  46. FT: Spectrum Looking for 3rd generation squarks, also charginos and Neutralinos, an urgent need.

  47. Constraining mSUGRA

  48. mSUGRA: Constraining Sensitive SM parameters: Bayes theorem, Observables P.Nath et al. 1207.1839 Experiment SUSYKIT, Multinest, SOFTsusy, Micromega SuperBayes. Eliis et. al ’11,’12 Ghosh,MG,Raychaudhuri,Sengupta,’12

  49. Prediction Gluino-Squark Mass Best Fit point:

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