Beyond the Standard Model

1. Beyond the Standard Model Journées de Prospective Giens April 2, 2012 Dirk Zerwas LAL Orsay • Beyond the Standard Model Higgs • Supersymmetry • Alternatives to supersymmetry • Conclusions on behalf of the BSM group (Groupe-2)

2. Beyond the Standard Model Higgs • Higgs portal: • add a hidden sector If the Higgs is at 125GeV: 2-parameter model: ΔH = cos2χ, Γhid LHC: BR=0.60 excl. 2012 ILC: BR=0.02 (±0.005) ΔH: • If no Higgs is observed with the LHC 14TeV 30fb-1 • non-observation of Higgs boson does not exclude its existence

3. Supersymmetry • fermion boson • has “no” problems with radiative corrections (quadrat. div.) • has a light Higgs Boson (<140GeV) • interesting pheno at the TeV scale 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 ~ ~ ~ ~ ~ • 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

4. 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

5. 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%

6. Supersymmetry: Rare Decays • Courtesy of flavour group: • Indirect constraint • Bμμ: • MFV in yukawa sector • BR small: |Vtb* Vtq|2 • SUSY Higgs s-channel • tanβ ↑ BR ↑ • LHCb and CMS: • mass peak BR(Bμμ) < 1e-9 (CMS: 1.7e-9) BR(Bsμμ) < 4.5e-9 (CMS:7.7e-9)

7. 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

8. Search for Supersymmetry: 3rd generation • CMS: • inclusive b-tagged analysis • 3rd generation: • large mixing possible • could be lightest squarks • mSUGRA (cascade) • MSSM (direct) • ATLAS sbottom pair production: • 2 b-tagged jets • missing ET • 14TeV: • sensitivity to 2.5TeV colored sparticles • SLHC: • 3TeV colored sparticles • ILC: • small mass differences Exclusion up to 400GeV 5fb-1: sensitivity up to 1TeV

9. 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 • LHC: • difficult scenario: limits of order 300GeV obtained with increased leptonic BRs (intermediate sleptons) • ILC: • less dependence on BRs • reach down to small mass differences

10. Measure Supersymmetry • LHC: • 5% level mass measurement • SLHC: • improve to 1% • ILC: • electroweak sector measurements • precision 0.1% • LHC: • 12fold ambiguity • ILC: • solves ambiguities LHC • LHC: • hint on Parameter unification • SLHC: • increases precision • ILC: • “measurement” of unification S-LHC + ILC • Dark matter (deduced): • LHC: • % level with ambiguities • ILC: • 0.1% level

11. Alternatives to Supersymmetry • Search for new physics: • virtual effect: deviations from the Standard Model • real effect: decay of a resonance Sequential standard model: Z’, W’ heavier version of Z and W Modify couplings to get other variants Search for a resonance Arkani-Hamed, Dvali, Dimopoulos (ADD): N ExtraDim macroscopic (LED) Search for deviations wrt Drell-Yan Randall Sundrum (RS): warped Extra Dimensions 1 additional dimension (compactified) Search for a Graviton resonance decay: ee,μμ,γγ (mass reconstruction)

12. New Gauge Bosons • Signature: • Z’ decay to lepton (e,μ) pairs • bump in mass spectrum • W’ decay to lepton+neutrino • different models different couplings • LHC 5fb-1 7TeV: • limit at 2.3TeV (Z’SSM) • limit at 2.3TeV(W’SSM) 100fb-1 14TeV: discovery up to 4.5/5.5TeV

13. Excited Quarks • Signature: • jet-jet decay • bump in mass spectrum • LHC 5fb-1 7TeV: • excited quarks: M> 3.35 TeV • colour octet scalars M> 1.94 TeV • mini-QBH with (6 extra dimensions): quantum gravity scales > 3.96 TeV • quark contact interactionsΛ > 7.8 TeV • LHC 14TeV: • double the reach in mass • contact interaction (ll 100fb-1): 31TeV

14. Extra dimensions • LHC 2.3fb-1 7TeV: • ADD • Ms: scale of onset of quantum gravity • n: number of extra dimensions • LHC 5fb-1 7TeV: • 2.1TeV for k/Mpl=0.1 (leptons) • 900GeV for k/Mpl=0.01 (photons) (hierarchy) prejudice: reduced Planck scale <10TeV mass of first Graviton excitation • LHC 30fb-1 14TeV (diphotons): • discovery 3.95TeV for k/Mpl=0.1 • discovery 1.6TeV for k/Mpl=0.01

15. Conclusions • Higgs looking promising • roughly >10% precision at LHC • ILC would gain by factor 10 • easy SUSY easily excluded • difficult SUSY: more luminosity essential and going to 14TeV • ILC: maximum impact for electroweak sector particles • alternative models thoroughly studied • discovery in the multi-TeV range still possible with LHC