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Search for Higgs and Supersymmetry PASCOS 2012 Merida June 7, 2012 Dirk Zerwas LAL Orsay • Introduction • Standard Model Higgs (low mass) • Beyond the Standard Model Higgs • Higgs couplings • Supersymmetric particles • Conclusions The LHC 2011: 5.6fb-1 delivered, 4.6fb-1 to 4.9fb-1 for analysis Great Startup in 2012: Gain 1TeV 4fb-1 2012: conditions becoming more difficulty but manageable 2012: 3fb-1 for ICHEP The Standard Model Higgs at the LHC • Signal dominated by gluon fusion • VBF (qqH) next candidate • VH smaller with large backgrounds • ttH for higher energies • exp: common analysis then separate gluon fusion,VBF • low mass: tau (but background) • VH (difficult: only access to b) • WW (leptonic): less mass info • ZZ (leptonic): clean, low rate • photons (rare, mass info) NLO, NNLO, NNL QCD+NLO-EW, BR: Anastasiou, Dawson, Djouadi, Harlander, Kalinowski, Kilgore, Melnikov, Spira, P. Zerwas and many more…. H ττ • usually 1 hadronic tau • transverse mass (W+misID-jet) • tau mass via LL technique • cat 1:VBF • cat 2: boosted (1j > 150GeV) • cat 3: 0/1 j >30GeV • Z decays dominate (resolution) VBF: Plehn, Rainwater, Zeppenfeld… • VBF channel (2jets) as example • better separation (recoil) • MMC • Z decays dominate • 5x signal • currently essentially inconclusive W/Z+H W/Z+bb • BDT used (jj, separation….) • order 100-150GeV pT • 2 b-tagged jets • missing ET/Z-mass • dominant BG: top, Z/Wbb • similar approach • order by V pT • S/B 1% (lowest pT) - 10% (highest pT) • BG normalization from data (sidebands) boosted: Butterworth, Salam …. H WW lνlν Dittmaier, Dreiner… • mass information: weak (neutrinos) • Spin correlations (lepton acoplanarity) • up to 2 jets • separate by jet-multiplicity and flavour (e/μ) • at least 20GeV proj ETmiss • BDT used! • WW dominates…. • no significant excess Final yesterday H WW lνlν • good description of ETmiss necessary • jet categories 0,1,2 • separated by flavor • transverse mass final discriminant • S/B order of 1/10 • compatible with bg only • 1sigma (yesterday) HZZ 4l • good lepton ID down to low pT • 7/5GeV (electron/muon) • ZZ main background • Z+jets secondary background • clean channel HZZ 4l Excellent description of BG: • on-shell Z ok (m12) • off/on-shell Z ok Low mass: width is detector resolution High mass: width is width Hγγ • vertex reco for mass resolution • CMS: use of BDT based on the reconstructed photons (higher sensitivity) The complete picture TeVatron: (W/Z)+H to b jets • LEE! • about 2 sigma Supersymmetry • fermion boson • has “no” problems with radiative corrections (quadrat. div.) • has a light Higgs Boson (<140GeV) • interesting pheno at the TeV scale spin-0 squarks: ~ ,~ q R qL spin-1/2 spin-1 q gluino: ~ g g sleptons: ~ ~ ℓR, ℓL ℓ h,H,A neutralino χi=1-4 Z, γ H± charginos: χ±i=1-2 W± 3 (or more) neutral Higgs bosons: h, A, H 1 (or more) charged Higgs boson(s): H± and supersymmetric particles Many different models: • MSSM (low scale many parameters) • mSUGRA (high scale few parameters) • DSS (SUSY with heavy scalars) • GMSB • AMB Additional (s)particles: • NMSSM • MRSSM/N=1/N=2 hybrid • and many more Talk Pran Nath V-Talk Pavel R-parity • production of SUSY particles in pairs • (Cascade-) decays to the lightest SUSY particle • LSP stable, neutral and weakly interacting: neutralino (χ1) • experimental signature: missing ET Supersymmetry: neutral Higgs bosons Higgs sector: mass of A, tanβ (vev ratio) tanβ ↑: g(Hτ,b) ↑ D0: • final states with τ and bbb ATLAS and CMS: • tau pair final states • mA ↑ cross section ↓ • large exclusion with 4.6fb-1 SM-like h mA up to 500GeV, tanβ down to 10 Supersymmetry: charged Higgs boson Signature for m(H±) <m(top) • top pair production • increase decays of top to tau • larger transverse mass • no excess • exclude as function of BR Interpretation in the MSSM: Exclude down to 2% Higgs couplings at the SFitter (Lafaye, Plehn, Rauch, D.Z. and friends): arXiv:1007.2645, arXiv:1205.2699, LHC Contino,… Define couplings as deviations from SM: Restrict total width (LHC blindness): • allow only tree-level deviations • tree-level transported to loops • no genuine deviations in loops http://www.thphys.uni-heidelberg.de/~plehn/index.php?show=sfitter&visible=tools Higgs couplings at the LHC • near future couplings (if…) • ultimate couplings (if…) Higgs 125GeV and Supersymmetry A. Djouadi et al. hep-ph/1112.3028 • need to maximize the radiative corrections to increase Higgs boson mass • electroweak scale (3TeV: maximal mixing) • mixing parameter Large mixing, but no constraint on the stop mass: Lindner (et al): 125GeV good for Standard Model up to GUT scale Search for Supersymmetry: gluinos and squarks Signature: • colored particles large (pb) cross sections • many high transverse momentum jets • large missing ET Measure background from data (CRs)/ Extrapolate sensitive variable • many cross checks possible • no exciting deviations Equal squark and gluino masses: 1.4TeV Search for Supersymmetry: 3rd generation 3rd generation: • large mixing possible • could be lightest squarks • mSUGRA (cascade) CMS: • MSSM (direct) • inclusive b-tagged analysis ATLAS sbottom pair production: • 2 b-tagged jets • missing ET Exclusion up to 400GeV 14TeV: • sensitivity to 2.5TeV colored sparticles Search for Supersymmetry: stops New this month Direct stop pair production: • stop decay to chargino (100%) • chargino (106GeV) W* decay • 2lepton signature plus jets • control regions for Z and top background • exclusion zero-suppressed • exclusion up to 140GeV (LSP: 45GeV) Search for Supersymmetry: Electroweak Sector Signature: • associated production of charginos and neutralinos • supersymmetric version of WZ (difficult) • leptonic decays 3(and more) leptons (muons,e) • missing ET Example: • Expect 26±5 Observe: 32 MSSM limits: • improve on LEP difficult scenario: limits of order 300GeV obtained with increased leptonic BRs (intermediate sleptons) GMSB Signature: • 2 taus with jets and ETmiss • effective mass • transverse masses Going beyond LEP significantly Low tanβ region for 2lepton search AMSB Signature: • long lifetime: chargino and LSP degenerate winos Talk D.P. Roy • interaction with material • bad tracks Talk Manuel Gerardo Paucar Acosta for MSSM focus Point Measure Supersymmetry LHC: • 5% level mass measurement HL-LHC: • improve to 1% ILC: • electroweak sector measurements • precision 0.1% SFitter: Lafaye, Plehn, Rauch, D.Z. and friends arXiv:1007.2190 arXiv:0709.3985 LHC: • 12fold ambiguity ILC: • solves ambiguities LHC LHC: • hint on Parameter unification HL-LHC: • increases precision Dark matter (deduced): LHC: • % level with ambiguities Talk Pran Nath HL-LHC + ILC Conclusions • SM Higgs: more data is needed • roughly >10% precision at LHC • easy SUSY easily excluded • difficult SUSY: +luminosity 14TeV-ε