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Searches for Heavy Resonances and New Particles at ATLAS

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Searches for Heavy Resonances and New Particles at ATLAS 1 Searches for heavy resonances and new particles at ATLAS Not reviewed, for internal circulation only CIPANP 2012 Sarah Heim, Michigan State University on behalf of the ATLAS collaboration Why are we looking for Physics beyond the SM? 2 The Standard Model of Particle Physics is a very successful theory, but cannot be the end of the story... For example,Not reviewed, for internal circulation only it does not - have a dark matter candidate - explain, why gravity is so weak compared to the other fundamental forces Also: Before we find the Higgs, we cannot be sure of how electroweak symmetry is broken Sarah Heim Searches for resonances 3 Final states (in this talk) Example models: - two leptons - Z'/W' bosons - two photons - RS graviton - two jets - Technicolor - two gauge bosons ? - Excited quarks Not reviewed, for internal circulation only - Color octet scalars Advantages of signature searches: - same final state can probe various models - new physics can be found independently of exact model SPOILER: No significant excess found in any of the shown analyses ---> 95% C.L. limits are set on a variety of models Sarah Heim Search for resonances in dilepton final states 4 Not reviewed, for internal circulation only Mμμ = 1.25 TeV Dileptons: Models 5 Dilepton resonances could be a signature of - new heavy gauge boson in the E6 model (Grand Unified Theory model) E6 SO10×U 1 SU 5×U 1×U 1 Z ' E6=Z ' cosE6Z ' sinE6 - Randall Sundrum graviton Not reviewed, for internal circulation only 1 warped extra dimension Kaluza-Klein tower of massive graviton states k/Mpl = 1.0-0.01 - technivector mesons in one of the Technicolor models Low Scale Technicolor model (Lane, Eichten) QCD-like spectrum ---------------------------------------- Benchmark model: Sequential Standard Model Z' (same couplings as Z boson), not theoretically motivated Sarah Heim Dileptons: Event selection 6 ~5 fb-1 Electrons - shower shape, hadronic leakage, tracking quality q/g l + - leading electron isolated ? Muons q/g - - Inner Detector and Muon Spectrometer quality cuts l - impact parameter and distance from primary vertex Not reviewed, for internal circulation only - opposite sign p-value: 13% p-value: 82% Electrons Muons Acceptance (2 TeV Z') ~70% ~45% Resolution (object with p = 1 TeV) 1-2% T 10-25% Dileptons: Limits 7 ~5 fb-1 Spin 1: new gauge boson Z' Spin 2: RS gravitons (Sequential Standard Model (different width, acceptance) or E6 GUT) Not reviewed, for internal circulation only 95% C.L. lower mass limits on reference models: Observed dilepton limit [TeV] Sequential Standard Model Z' 2.21 RS graviton (k/M = 0.1) 2.16 Pl ATLAS-CONF-2012-007 Sarah Heim Dileptons: Technicolor Limits 8 ~1 fb-1 Low Scale technicolor interpretation of CDF Wjj excess (Phys. Rev. Lett. 106 (2011) 171801) Not reviewed, for internal circulation only 95% C.L. limits on reference model: Observed dilepton limit [TeV] ρ / ω (m(ρ /ω )-m(π ) = 100 GeV) 0.47 T T T T T ATLAS-CONF-2011-125 Sarah Heim Dileptons and diphotons 9 ~1-2 fb-1 Not reviewed, for internal circulation only RS graviton: - diphoton branching fraction ~ twice dielectron/dimuon - limits (k/M = 0.1) [TeV]: 1.85 (diphoton), 1.95 (diphoton+dilepton) Pl PLB 710 (2012) Searches in dijet final states 10 Not reviewed, for internal circulation only Dijets: Models 11 Resonances q/g q/g - Excited quarks ? - possible if quarks are composite q/g q/g - Color octet scalars - coloredNot reviewed, for internal circulation only resonance decaying into two gluons Deviation in mass spectrum/angular distributions - Quantum black holes Scale at which gravity becomes strong - extra dimensions (M reduces to M ) Pl D - assume classical relativity for production - Quark contact interaction - quark compositeness (visible above compositeness scale Λ) - interference with QCD (here: destructive) Dijets: Event Selection 12 ~5 fb-1 - events with at least two jets (anti k , R = 0.6) q/g q/g T - |y| < 2.8, p > 80 GeV ? T - |y*| in center of mass system q/g q/g must be small (jets from new physics are expected to be more isotropic than SM dijetNot reviewed, for internal circulation only production) - fit dijet mass spectrum with a function to estimate SM background - check fit quality and search for peak-like excesses - also search in angular distributions Dijets: Limits 13 ~5 fb-1 Not reviewed, for internal circulation only 95% C.L. limits on reference models: Limit on Observed limit [TeV] Excited quarks q* mass 3.35 Color octet scalars s8 mass 1.94 Mini Quantum Black Holes (n = 6) Gravity scale 4.11 Quark contact interaction Compositeness scale 7.8 ATLAS-CONF-2012-038 Search for resonances in diboson final states 14 Not reviewed, for internal circulation only ZZ 15 ~1 fb-1 2 channels (inv. masses of pairs close to Z mass) llll: 2 pairs of isolated electrons/muons lljj: exactly two isolated Not reviewed, for internal circulation only electrons/muons, jet pair (anti kT, R = 0.4) - RS graviton (k/M = 0.1) Pl excluded for 325-845 GeV - also limit on fiducial cross section set for any new ZZ physics (llll) Submitted to PLB arXiv:1203.0718 WZ 16 ~1 fb-1 - Z-> ee, μμ and W->νe, νμ ---> two oppositely charged, same flavor leptons, exactly one additional lepton, MET Not reviewed, for internal circulation only - discriminating variable: Submitted to PRD arXiv:1204:1648 Lower mass limit on W' in extended Gauge Model: 760 GeV Limits on ρ in Low Scale Technicolor T (m(ρ )-m(π ) = m(W)) T T - m(a ) = 1.1 T excluded m(ρ ) < 483 GeV T - m(a ) >> m(ρ ) T T excluded m(ρ ) < 469 GeV T Conclusions 17 Presented results of resonance searches at ATLAS in a variety of final states - no new physics found so far - extended exclusion ranges for many models Not reviewed, for internal circulation only Looking forward to 2012 results! - resonance searches benefit directly from higher CM energy Simulated black hole event superimposed over image of ATLAS detector Sarah Heim Backup: WZ Limits 18 ~1 fb-1 Limits on ρ in Low Scale Technicolor Model T - depend on m(π ) and m(a ), T T and π mixing with EW gauge bosons T - assume sin(χ) = 1/3 - consider two scenarios: m(a ) = 1.1 m(ρ ), m(a ) >> m(ρ ) T T T T Not reviewed, for internal circulation only - signal template modeled without spin correlations ---> affects acceptance, use W' acceptance as check Sarah Heim Predicted limits 19 Not reviewed, for internal circulation only - depends on the achieved acceptance Sarah Heim.
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