Exotica in ICNFP 5 Kolymbari, Crete 5 August 5 Claudia-Elisabeth Wulz Collaboration Institute of High Energy Physics, Vienna
Overview Selected recent results: - Dark matter searches EXO4-4, EXO-54, EXO-48, EXO-47 - Searches with boosted objects EXO4-, EXO4-9, EXO-7 - Weak bosons, tops, Higgs in final state - Long-lived signatures EXO-8, EXO-6, EXO-4, EXO-6, EXO-6, EXO4-, EXO4-7 - Classic narrow resonance searches DP5-7, EXO4-, EXO-7, EXO-59, EXO-5, EXO-5, EXO-49, EXO-46, EXO-45, EXO-4 All public BSM physics results: https://twiki.cern.ch/twiki/bin/view/public/physicsresultsexo https://twiki.cern.ch/twiki/bin/view/public/physicsresultsbg C.-E. Wulz ICNFP, Aug. 5
Contact interaction ] χ-nucleon Cross Section [cm -6-7 -8-9 -4-4 -4-4 -44-45 -46 CDMSlite χχα (G s 4Λ supercdms a ) µν Scalar Spin Independent DM DM, 9% CL, 7 TeV, 5. fb, 9% CL, 8 TeV, 9.7 fb µ (χγ χ)(γ ) CoGeNT SIMPLE COUPP CDMS II, 9% CL, 8 TeV, 9.7 fb XENON LUX C.-E. Wulz [GeV] M χ µ Λ Vector Dark Matter Searches Mediator Complementary to direct/indirect searches, best for low DM mass and spin-dependent couplings -EXO-48, EPJC 75 (5) 5 ] WIMP-nucleon cross section [cm 7 8 9 4 4 6 4 4 DM DM Preliminary truncated, g = g χ mono-z (D8) mono-γ (D8) mono-z (D9) Spin Dependent = [GeV] g χ g 9% CL limit on M/ + - pp Z χ χ l l χ χ s = 8. TeV, L = 9.7 fb mono-jet (D8) truncated, g = g χ 4 = Spin Independent, Vector µ (χγ χ)(γ ) µ. Λ..5 5 PICASSO SIMPLE COUPP IceCube (WW) WIMP mass m χ [GeV] Mediator Mass M [GeV] M χ = 5 GeV, Γ = M/ M χ = 5 GeV, Γ = M/ M χ = 5 GeV, Γ = M/8π M χ = 5 GeV, Γ = M/ M χ = 5 GeV, Γ = M/ M χ = 5 GeV, Γ = M/8π g g contours χ 9.7 fb (8 TeV) Select events with ISR > mono-objects, e.g. mono-jets, mono-z, mono-γ mono-jets g g χ mono-z -EXO- -54 ICNFP, Aug. 5 4
) (cm σ N-χ - - -4-5 -6-7 -8-9 -4-4 -4-4 -44-45 -46 Razor DM Spin Dependent µ (χγ γ χ) (γ γ ) µ 5 5 O AV : Λ Dark Matter Searches Recent razor analysis of dijet + E T miss signature Λ (GeV) 5 45 4 5 5 Preliminary Preliminary Razor-µ 9% CL limit: AV EFT operator Expected limit ± σ expected limit Observed limit Λ < m χ Λ < m χ /π 8.8 fb (8 TeV) 8.8 fb + - IceCube W W SIMPLE COUPP + - Super-K W W M χ (GeV) = 8% R Λ g = eff g = eff g = 4 eff (8 TeV) g = 4π eff -EXO- 4-4 Λ (GeV) 5 45 4 5 5 ) (cm σ N-χ - - -4-5 -6-7 -8-9 -4-4 -4-4 -44-45 -46 Preliminary Preliminary Razor-µ 9% CL limit: V EFT operator Expected limit ± σ expected limit Observed limit Λ < m χ Λ < m χ /π Spin Independent (χγ O V : Razor DM µ χ) (γ ) µ Λ 8.8 fb (8 TeV) 8.8 fb (8 TeV) = 8% R Λ g = eff g = eff g = 4 eff g = 4π eff XENON SIMPLE COUPP supercdms CDMSII LUX M χ (GeV) R Λ uantifies fraction of events for which EFT hypothesis is still valid 5 5 g eff = g g χ 5 5 (GeV) C.-E. Wulz 4 M χ M χ (GeV) ICNFP, Aug. 5
Long-lived Particle Signatures Long-lived particles are predicted in many BSM scenarios SUSY: GMSB, AMSB, split SUSY, RPV SUSY Hidden valley scenarios Signatures: Displaced objects Delayed objects Disappearing or kinked tracks Lepton jets Recent examples of searches: Neutral particles decaying to photons (-EXO4-7) Neutral particles decaying to muons (-EXO4-) Heavy stable charged particles (-EXO-6) C.-E. Wulz 5 ICNFP, Aug. 5
Long-lived Neutral Particles Decaying to Photons Model with GMSB: long-lived lightest neutralino decays to gravitino and photon γ γ g g g (Beam axis points out of the page) photon e + e - χ χ ECAL G G E miss T γ Event selection: γ, with one converting to e + e -, at least jets, and E miss T 4 Scenario:.4 cm cτ cm (cm) Mean Lifetime cτ χ g g g Preliminary g g χ χ G G Conversions Exp. (9.7 fb at 8 TeV) Conversions Obs. (9.7 fb at 8 TeV) Timing Obs. (4.9 fb at 7 TeV) CDF Obs. (.6 fb at.96 TeV) E miss T GMSB SPS8 γ G χ d xy transverse impact parameter Beam spot C.-E. Wulz 6 5 5 Λ (TeV) 4 χ Mass (GeV) -EXO4-7 ICNFP, Aug. 5
Long-lived Neutral Particles Decaying to Muons Topology: Two muons originating from displaced secondary vertex, detected in muon chambers only Limits derived for two specific models: ) H -> XX -> 4µ (H non-sm Higgs boson, X long-lived boson with spin ) ) suark pairs, with -> χ, long-lived χ -> µµν (R-parity violated) µ reconstruction and selection efficiency -EXO4- Signal systematic errors Data: cosmics d : transverse impact parameter C.-E. Wulz 7 This analysis is orthogonal to a previous one that used only the tracker (arxiv: 4.6977) the two analyses have been combined to improve limits ICNFP, Aug. 5
Long-lived Neutral Particles Decaying to Muons Combined 95% CL upper limits for muon chamber and tracker analyses H -> XX -> 4µ.5 fb (8 TeV) -> χ, χ -> µµν.5 fb (8 TeV) ) [pb] - σ(h XX)B(X µ + µ - - Observed limits m X = GeV/c m X = 5 GeV/c m X = 5 GeV/c Expected limits (±σ) = GeV/c m X Preliminary = 4 GeV/c m H ν) [pb] - µ + µ χ χ, + )B( σ( - - Preliminary Observed limits m / m χ = / 48 GeV/c m / m χ = 5 / 48 GeV/c m / m χ = / 48 GeV/c m / m χ = 5 / 494 GeV/c Expected limits (±σ) / m χ = / 48 GeV/c m -4-4 cτ [cm] -4 cτ [cm] C.-E. Wulz 8 ICNFP, Aug. 5
Displaced Jets Hidden valley benchmark model: H/Φ -> Φ hs -> π v π v with π v ->jj/ll Decays of v-particles must occur via hidden sector mediator as they do not couple directly to SM particles. Topology studied: hadronic jets originating from same displaced vertex. p f hs v f -EXO-8, PRD 9 (5) 7 p v f f (X ) [pb] σ(h XX) B 95% CL limits: m X = 5 GeV m X = 5 GeV Exp. limits (± σ) - H -> X X, X -> - 8.5 fb (8 TeV) = GeV m H - X cτ [cm] C.-E. Wulz 9 ICNFP, Aug. 5
Long-lived Heavy Charged Particles _ R-hadrons: long-lived gluinos could hadronize to e.g. g-g, g-, g- states Stable chargino or stau, etc. If mass greater than about GeV: β <.9. Nuclear interactions may lead to charge exchange. Tracker (high de/dx) + µ system (long TOF) C.-E. Wulz Tracker only (charge exchange) ICNFP, Aug. 5
Points in pmssm LHC sub-space 4 Long-lived Heavy Charged Particles Reinterpretation of previous results on long-lived chargino production [JHEP 7 () ] in context of pmssm (first constraints at the LHC) and AMSB models, based on highly-ionizing and penetrating particles 8.8 fb (8 TeV) Constraints on the pmssm sub-space (m TeV) Excluded Allowed (ns) τ ± χ -EXO-6 8.8 fb AMSB (tan(β) = 5, µ > ) (8 TeV) Frac. excluded.8.6.4. 5 - -5 5 5 log [ τ (ns) ] 5 - -5 5 5 C.-E. Wulz Observed limit Expected limit Expected limit ± σ Expected limit ± σ Excluded area 4 5 6 7 8 9 mass (GeV) χ± ICNFP, Aug. 5
Boosted Objects Massive final-state particles (m X > TeV mass) with high Lorentz boost (γ > ) - overlapping jets - jet substructure - non-isolated leptons New analysis techniues to improve high-mass sensitivity (up to factor ) - grooming (remove noise and pile-up) - pruning (remove soft, large-angle particles from jets) - tagging (b, t, W/Z, ) - subjettiness, mass-drop Low-p T top High-p T top C.-E. Wulz ICNFP, Aug. 5
X Boosted Objects: X -> WH First search in semi-leptonic WH final state H b b Search strategy close to one for high-mass _ WW resonances in lν final state, with additional b-tag reuirements W! _ Main backgrounds: W+jets, WW/WZ, tt -EXO4- σ 95% *BR(W' WH) (pb) Preliminary W µ ν Full CL S Observed Full CL S Expected ± σ Full CL S Expected ± σ HVT B(gv=):xsec * BR(W' WH) W' LH model:xsec W' * BR(W' WH) 9.7 fb (8 TeV) Events / ( GeV ) Preliminary Data (eν) W+jets W' HVT B(gv=) WW/WZ Top Uncertainty 9.7 fb (8 TeV) p-value - - Preliminary 9.7 fb (8 TeV) σ σ σ - -4 obs signif, e+µ combined 4 σ - 8 5 M W' (GeV) - 8 4 6 8 4 (GeV) M WH -5 8 4 6 8 4 W' mass (GeV) C.-E. Wulz ICNFP, Aug. 5
Boosted Objects: X -> ZH -> ττ Novel analysis feature: τ pair in boosted regime Six search channels: leptonic(τ e τ e, τ e τ µ, τ µ τ µ ), semi-leptonic(τ e τ h, τ µ τ h ), all-hadronic (τ h τ h ) Different backgrounds according to search channels : Z/γ+jets for leptonic channels, for τ e τ h, τ µ τ h tt and W+jets, for τ h τ h QCD Event selection: single jet or H T ) [fb] - τ + B(H τ B(Z ) σ(pp Z' ZH) - _ HVT Model B (g V Expected ± σ Expected ± σ Observed Combination of 6 search channels 9.7 fb (8 TeV) 5 5 [GeV] m ZH C.-E. Wulz 4 = ) PLB 748 (5) 55, -EXO-7 V g cf /g Events / bin.5 -.5 6 4 8 6 4 Γ th M B (g V 9.7 fb (8 TeV) Background estimation Observed Z/γ+jets tt and single-top VV (V = Z or W) W+jets Signal (M =.5 TeV, σ 5) Z' τ µ τ h category 5 5 5 m ZH [GeV] σ exp > 7% M = ) TeV HVT model 9.7 fb (8 TeV).5 TeV - - g c V H ICNFP, Aug. 5
Boosted Objects: X -> WH, VH, VV Preliminary 9.7 fb (8 TeV) σ 95% (pp X) [pb] X WZ lllν (EXO-5) X WV (EXO-4) X WV lν (EXO-9) X WZ ll (EXO-9) X WH lνbb (EXO4-) X VH ττ (EXO-7) X VH bb,6 (EXO4-9) + σ TH (pp X )+σ TH (pp X )+σ TH (pp X ± X = X / X - ), V = W / Z - HVT Model B (g = ) V BR(X WZ) BR(X WH) BR(X WW) BR(X ZH).5.5 Resonance mass [TeV] C.-E. Wulz 5 ICNFP, Aug. 5
Classic Narrow Resonance Searches Example: Dijet spectrum Background estimation: data-driven, parameterization by smooth function Interpretation possible for many exotica scenarios Sensitive beyond the Run I reach for resonances with M > 5 TeV -EXO-59, PRD 9 (5) 59 σ B A (pb) 4 9.7 fb String Excited uark Axigluon/coloron Scalar diuark S8 W' SSM Z' SSM RS graviton (k/m=.) (8 TeV) A [pb] B σ -DP-5-7, cds.cern.ch/record/778 Preliminary 4.8 pb ( TeV) String Excited uark Axigluon/coloron Scalar diuark S8 W SSM Z SSM RS graviton (k/m=.) - - -4-5 95% CL upper limits gluon-gluon uark-gluon uark-uark 4 5 Resonance mass (GeV) C.-E. Wulz 6-95% CL upper limits gluon-gluon uark-gluon uark-uark 4 5 6 7 Resonance mass [GeV] ICNFP, Aug. 5
Exotica Limits March 5 C.-E. Wulz 7 ICNFP, Aug. 5
Conclusions has studied a plethora of Exotica signatures with s = 7 TeV and s = 8 TeV data and has derived limits for many scenarios. Interesting excesses have been seen stay tuned for more results at s = TeV! Sensitivity for New Physics is expected to grow fast during Run II. C.-E. Wulz 8 ICNFP, Aug. 5