Поиски хиггсовского бозона, суперсимметрии и тяжелых векторных

бозонов в эксперименте АТЛАС

Научная сессия-конференция секции ЯФ ОФН РАН«Физика фундаментальных взаимодействий»

ИТЭФ, ноябрь 2011 гА.М.Зайцев, ИФВЭ, Протвино

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Scope

• ATLAS • Searches:

– Higgs boson– Supersymmetry– Gauge bosons

• ATLAS upgrade

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The ATLAS detector

Inner Detector (|η|<2.5, B=2T):Si Pixels, Si Strips & Transition Radiation detector tracking and vertexing, e/π separation, dE/dXMomentum resolution: σ/pT ~ 3.8x10-4 pT (GeV) 0.015⊕

EM calorimeter: Pb-LAr Accordione/γ trigger, identification and measurementE-resolution: σ/E ~ 10%/√E

HAD calorimetry (|η|<5): segmentation, hermeticityFe/scintillator Tiles (central), Cu/W-LAr (fwd)Trigger and measurement of jets and missing ETE-resolution: σ/E ~ 50%/√E 0.03⊕

Muon Spectrometer (|η|<2.7)Muon trigger and measurement withmomentum resolution < 10% up to Pμ ~ 1 TeV

4 Superconducting magnets: Central Solenoid (B= 2T)3 Air core Toroids

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Forward detectors

B. Di Girolamo

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Data Taking Efficiency the luminosity delivered (between the declaration of stable beams and the LHC request to turn the sensitive detectors off)Efficiency = --------------------------------------------------------------------------------- the luminosity recorded by ATLAS

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Operational fractionSubdetector N Channels Operational

FractionPixels 80 M 96.9%SCT Silicon Strips 6.3 M 99.1%TRT Transition Radiation Tracker 350 k 97.5%LAr EM Calorimeter 170 k 99.5%Tile Calorimeter 9.8 k 97.9%Hadronic Endcap LAr Calorimeter 5.6 k 99,6%Forward LAr Calorimeter 3.5 k 99.8%MDT Muon Drift Tubes 350 k 99.8%CSC Cathode Strip Chambers 31 k 98.5%RPC Barrel Muon Chambers 370 k 97.0%TGC Encap Muon Chambers 320 k 98.4%LVL1 Calo Trigger 7160 99.9%LVL1 Muon RPC Trigger 370 k 99.5%LVL1 Muon TGC Trigger 320 k 100%

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Luminosity• The maximum instantaneous

luminosity: 3.65x1033 cm-2 s-1

• Delivered Luminosity: 5.61 fb-1

• ATLAS Ready Recorded: 5.25 fb-1

Absolute luminosity calibration by van der Meer scansΔL/L = ±3.4% (2010, prel)ΔL/L = ±3.7% (2011, prel)

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Pile-up• 50 ns bunch trains for ~all 2011

data• Substantial in- and out-of-time

pileup• Much progress understanding

impact on performance, with data & simulation

Z→μμ event with 11 primary vertices

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Highest-mass dijet event observed so far

Mjj = 4 TeVJet 1: pT = 1.8 TeV, η = 0.3Jet 2: pT = 1.8 TeV, η = -0.5Etmiss= 100 GeV

Search for Higgs boson (SM and MSSM)

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Higgs cross-sections• H→γγ: rare channel, cleansignature, the best for low mass

•H→WW(*):→lνlν: very important in theintermediate mass range→ lνqq: highest rate, importantat high mass

•H→ZZ(*):→ 4l: golden channel→ llνν: good for high mass→llbb: also high mass

• H→ττ: good signal/background, important at low mass, rare

• Associated prod. H→bb-barttH, WH, ZH It is useful for the discovery It is very important for Higgsproperty studies if SM Higgs isdiscovered

L=1.08 fb-1

L=1.70 fb-1

L=1.04 fb-1

L = 2.2 fb-1L=1.04 fb-1L=1.04 fb-1

L=1.06 fb-1

L=1.04 fb-1

Events expected to be produced with L=1 fb-1

MH, GeV WW→lνlν ZZ→4l γγ

120 127 1.5 43

150 390 3.6 16

300 89 4.8 0.04

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H→γγ arXiv:1108.5895v1 [hep-ex]

Two high-quality isolated high-pT photonspT1 > 40 GeV; pT2 > 25 GeV|η12| < 1.37 and 1.52 < |η12| <2.37

Excluded: ~ 4 the SM production cross-section * BR

No indication of an excess is found. Limits on SM Higgs production cross section are set.

A pointing method (using the first two samplings ofthe LAr calorimeter , or the first sampling and theconversion point for converted photons) is used todetermine the vertex position → Its resolution is ~1.6 cm

isolation

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Other Light Higgs searchesZ (W) + Higgs →b b̄ ATLAS-CONF-2011-103Select events with Z or W boson in theleptonic final state, and with exactly two jets btagged with pT >25 GeVHighest rate at low higgs massLarge background

H→ττ Promising channel for mH=110-140 GeV

Both channels exclude ~ 10 the SM productioncross-section * BR

H→ττ̄→ll+4ν ATLAS-CONF-2011-133H→ττ̄→lτhad +3ν ATLAS-CONF-2011-135

collinear approxi-mation

τ τ + 1 high pT jetET

miss > 30 GeV

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H→WW(*)→lνlν ATLAS-CONF-2011-134

The most sensitive process for 130 < mH < 200 GeVBut also one of the most challenging channels: complete reconstruction of the invariant mass of this final system not possible.Largest background is the irreducible WW SM production.Also Drell-Yan and top process when looking to final states associated to one jet .

Select events with two high-pT opposite sign leptons and large transverse missing energy (ET miss)

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H→WW(*)→lνlν – event selection

ee eμμμ

Distributions of ET, rel miss after lepton pT cuts. Background distributions normalized by the data from control samples

Data/MC agreement better than 10%, within systematic uncertainties

Man Backgrounds- WW, tt-bar, single top, Z/γ*+jets, diboson (WZ,ZZ,Wγ): from MC- W+jets: from data using loosened identification and isolation criteria

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H→WW(*)→lνlν – exclusion limit

The expected (dashed) and observed (solid) 95% C.L. upper limits on the cross-section,normalized to the SM cross-section,as a function of the Higgs boson mass.(the jump in the expected and observedlimits at 220 GeV is due to the change inthe selection at that point)

A Standard Model Higgs boson with 154 <mH <186 GeV is excluded at 95% C.L.Expected exclusion mass range is 135<mH <196 GeVThe observed limit is within 2σ the expected one in the mass range 130 – 150 GeV

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H→ZZ(*)→4l arXiv:1109.5945v1

The “gold-plated” channel.Very clean, but small rates.

Background:− irreducible ZZ(*);− reducible Z+jets (particular:Zb ), ttb̄ t̄

Event selection:−Inclusive high-pt electron or muon;−Two isolated same-flavour opposite charge lepton pairs−Reconstruct the Z (mass window cut)−Veto low invariant mass pairs−For m4l <2mZ require also small lepton impact parameter (rejects Zb and tt )b̄ t̄

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2μ2e candidate m=209.7GeV

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H→ZZ(*)→4l

Invariant mass leading (left) and sub-leading (right) lepton pair

A total of 27 events are selected by theanalysis algorithm: 6ee, 9eμ, 12μμExpected: 28±4

Main Backgrounds:−ZZ(*): from MC theoretical uncertainty (15%)− tt-bar: from MC theory normalization uncertainty (10%)−Z+jets: normalized using data (control sample regions) uncertainties 20-40%

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H→ZZ(*)→4l- exclusion limits

Very close the SM cross-section.SM Higgs boson excluded at 95%CL in themass ranges 191-197, 199-200 and 214-224 GeV

ZZ→llνν ATLAS-CONF-2011-148

Best channel at high mass

Identify Z→ll:− High pT e/μ − 2 SF opposite sign isolated leptons (e/μ)

with|mll –mZ |<15 GeV Identify Z→νν if mH >200 GeV:

− Reject event with Δφ(pTmiss ,pT

jet )<0.3 to

reduce bkg with fake ETmiss

− ET miss>66 (82)GeV in low (high) mass region

Events with one or more b-tagged jetsare rejected (to reduce top bkg)Main Backgrounds

− Diboson, Z, tt : from MCt̄− W : normalization obtained data/MC of like-sign

lepton pair events with high ETmiss

− QCD multi-jet: using data sample with loosened electron selection

SM Higgs boson excluded at 95%CL in the mass range 310- 470 GeV

ZZ→llqq ATLAS-CONF-2011-150

Selection:2 on-shell Z’s (if mH >2mZ)

- For isolated leptons pT>20 GeV with |mll-mZ|<15 GeV-2 jets pT>25 GeV with 70 <mjj<105 GeV and mjj constrained to Z mass- mH >300 GeV: Δφ ll,jj <90°& 2 jets pT >45 GeV

ETmiss <50 GeV (to reduce bkg from tt )t̄

Categories: 2b-tagged jets and untagged jets

SM-like Higgs boson with a production rate of 1.2 to 12 SM cross section is excluded at 95%CL

Main Backgrounds: - Z+jets: shape from MC an normalization from data using sidebands- top: shape from MC and normalization from data using sidebands - ZZ, WZ, W+jets: from MC - QCD multijet: using data sample with loosened electron selection

WW→lνjj arXiv:1109.3615v1 [hep-ex]

Largest σ*BR2 on-shell W’s (if mH >2mW)

- Exactly one reconstructed isolated lepton (e/μ) with pT >30 GeV , ET miss >30 GeV

- Exactly 2 jets (H+0jet) or 3 jets (H+1jet) with pT >25 GeV and the closest mass to W of the jet pair has to satistfy 71<mjj <91 GeV

Events with one or more b-tagged jets arerejected (to reduce top bkg)

Main Backgrounds- W+jets: from MC- Z+jets, tt-bar, diboson: from MC- QCD multijet: using data sample withloosened electron selection

The upper limit at mH =400 GeV is 2.7 SM cross section

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ATLAS SM Higgs Combination ATL-CONF-2011-135

The expected (dashed) andobserved (solid) cross-sectionlimits for the individual search channels, normalized to the Standard Model Higgs boson cross-section, as functions of the Higgs boson mass.

Correlated uncertainties (Jet Energy Scale, Luminosity, etc) taken into account.In other cases, e.g. data driven background estimates, the uncertainties are uncorrelated.Careful treatment of theory uncertainties: - Higgs boson cross-section uncertainties in QCD scale and PDF+αs

- PDF uncertainty is fully correlated among different channels and it is included in the combination

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ATLAS SM Higgs Combinations

Combined upper limit onthe SM Higgs productioncross section divided by theSM expectation. This is a95% CL limit using theCLs method in the entiremass range

Standard Model Higgs boson mass excluded at 95% C.L.:

146< mH <232, GeV256 < mH < 282 GeV296 < mH < 466 GeV

Perspectives

A 95% CL exclusion for the whole mass range could be achieved by combiningATLAS-CMS results for an integrated luminosity of about 4-5 fb-1

2012 (with hopefully additional 10 to 20 fb-1 ) should bring more answers

Combination ATLAS+CMSG.Rolandi, HCPS 2011, Paris, November 14-18

SM Higgs boson excluded at 95%CL or higher in the mass range

141- 476 GeV

114 < MH < 141 ???

MSSM Higgs SearchesMSSM H/A/h→ττATL-CONF-2011-132

Production: gg→A/H/h and b A/H/hb̄

Decays:eμ 4ν, e/μτ had 3ν, τ had τ had 2ν

H+→τ had+ + ν

ATLAS-CONF-2011-138

Selection:- τ jet with pT >35 GeV. -no other τ-ET

miss >40 GeV -at least one b-tagged jet

SUSY modeling> 100 free parameters in general MSSM

Constrained models:− various SUSY breaking scenarios− assume unification at GUT scale→ only a few free parameters

Toy models (phenomenological models):−assume mass and hierarchy of sparticles−assume specific decay chain

Model independent sensitivity:cross-section x efficiency x acceptance (σAε) can be used to test other models

R-Parity:introduced to suppress violation of leptonic and baryonic numbers

R-Parity conserving (RPC):−SUSY particles produced in pairs−lightest SUSY particle (LSP) stable → missing transverse momentum (ET

miss )

R-Parity violating (RPV):- long-lived particles → displaced vertices → particles reaching muon spectrometer- resonance searches

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Searches for SUSYAt the LHC sparticles are pair produced,dominantly squarks and gluinos via the strong interaction (σ ~ 1 pb).They decay via cascades into the stable LSP (neutralino or gravitino), assuming R-parity conservation.Common signature:multiple, high energetic jets and transverse missing momentum

Distinguish final states by additional particles:zero, one, two, .. leptons (e, μ), two photons, b-jets

Incomplete event reconstruction due to LSPNo mass peakSUSY is in the tails of the distributions

SM backgrounds (top, W/Z+jets, QCD) are takenfrom/verified in control regions

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SUSY searchesChannel Search goals Integrated

luminosity0-leptons+ jets+ETmiss Heavy coloured particles with large

mass splitting1.04 fb-1

0-lepton + high mult. jets Long decay chains 1.3 fb-1

1-leptons+jets+ETmiss Medium mass splittingDecays to charginos

0.165 fb-1

2-leptons+ETmiss Gauginos and sleptons intermediate decays

1.04 fb-1

0-leptons+ bjets+ETmiss Gluino and 3rd gen. squarks decaying to heavy flavors

0.83 fb-1

Diphoton+ETmiss GMSB with neutralino NLSP 1.07 fb-1

Long-lived particle Small mass splitting 37 pb-1

eμ resonance 0.87 fb-1

multileptons Gaugino decays 35 pb-1

Medium-lived particle R-parity violation 35 pb-1

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SUSY search in Jets + ET,missarXiv:1109.6572

Select events with jets and missing ET Veto events with pT of e(μ) > 20(10) GeVDifferent jet multiplicity sensitive to different squark or gluino pair production.Optimize cut on meff = H T + ET

miss and ETmiss

for each jet multiplicity(HT = scalar sum of all jet ET).Combine channels to optimize search for different topologies

Background sourcesW+jets Leptons reconstructed as jetsZ/γ+jets γ/leptons as jets, Z+jets→νν+jetsTop Hadronic tau decayQCD Mis-measurement of jets or ν from heavy flavor decay

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SUSY limits from Jets + ET,miss

Phenomenological model:m(X̃0

1) = {0, 195, 395}

→ m( ) = m( ) > 1075 GeVg̃ q̃

mSUGRA ( tanβ=10, A0=0, μ>0 )

→ m( ) = m( ) > 980 GeVg̃ q̃

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Large Jet Multiplicity + ETmiss

arXiv:1110.2299v1

Use jets + missing ET analysis and increase number of jets: Njets > 6. Signal region defined by number of jets and MET/√HT.Main background: multijet production.QCD control region defined by lower number of jets.Other background estimated from MC and validated in different data control regions.

mSUGRA exclusion limit (tanβ=10, A0=0, μ>0) : competitive to 0lepton (2-4 jets) for high m0 → no excess over SM expectation found

→ m( ) > 520 GeVg̃

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ETmiss

+ b-jets + 0-leptonATLAS-CONF-2011-098

Analysis similar to jets+0 lepton channel but requires at least one b-jet.Sensitive to 3rd generation squarks.

Phenomenological MSSM model

General simplified model:- Squarks assumed to be heavy- Gluino-gluino pair production

m( ) > 660 GeV g̃for m(X̃1

0) < 200 GeV

m( ) > 720 GeV forg̃ m(b̃1) < 600 GeV

ET,miss + 2-leptonsarXiv:1110.6189

Leptons in the decay chains of squarksand gluions (e.g. via sleptons or W) Limit on simplified model:

− productiong̃g̃−decay to LSP via Chargino−(mheavy-mLSP)= 2*(mheavy-mchargino)

→ m( ) > 600 GeV for m(g̃ X̃10) < 200 GeV

ETmiss + 1-lepton arXiv:1109.6606

Leptons in the decay chains of squarks and gluions (e.g. via sleptons or W).Direct gaugino production.

Charginos with masses up to 200 GeV are excluded

Model:

Event selection:- Exactly 1 high pT lepton (e or μ)- 3 jets (>60, >25, >25 GeV)- ET

miss >125 GeV, ETmiss >0.25*Meff

- Meff>500 GeV

Search for ETmiss+2-leptons events with- Same-sign leptons - Opposite-sign leptons - Opposite-sign, identical flavor

Diphoton + ETmiss arXiv:1111.4116v1

In gauge-mediated SUSY breaking(GMSB) models, the LSP is the gravitino

Signature: 2γ + ETmiss +X

Generalized model of gauge mediatedSUSY breaking (GGM) with a bino-like lightest neutralino σ<0.02 – 0.04 pb (95 % C.L.) m(gluino)>776 GeV

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SUSY Searches result summary

Search for heavy resonances

Predicted by many BSM theories: GUTs, extra dimensions, alternative EWSB…

Famous historical precedents

Clean signatures:-bump in invariant mass- well controllable background

Experimental challenges: -no mass predictions;-measured objects O(1 TeV), - resolution and efficiency based on extrapolation and simulation.

Dilepton resonances (Z’, spin 1) arXiv:1108.1582

Sequential Standard Model (SSM) Z’ as a benchmark. GUT inspired E6 model leading to 6 Z’ candidates.

General strategy: -calibrate resolution and scale-background control and evaluation ofsystematic uncertainties-search for an excess above background

Electrons: - ET1,2 > 25 GeV -|η| < 2.47 (TR excl.) - Isolation - ΣET (R <0.2) < 7 GeV - Pixel B-layerAcceptance ~ 65%

Muons:-pT1,2 > 25 GeV-Reconstructed in ID and muon spectrometer-Isolation:pT (R < 0.3)/pT (μ) < 0.05Acceptance ~40%

Z’ limitsBackground:Z/γ∗, diboson, W+jets, tt → MC@ t̄NLO(NNLO)normalized to the Z peak,QCD background – from data

95% CL intervals on fitted N(Z') convertedinto limits on σB(Z' → ll) using the cross-secton ratio between Z/Z’:

m(Z’)>1.83 TeV

Dilepton resonances: technimesons ATLAS CONF 2011‐ ‐ ‐125

Low Scale Technicolor:- QCD like spectrum‐- ω0

T and ρ0T degenerate in mass.

- Narrow spin 1 resonances: ω0

T, ρ0T, a0

T > dileptons‐- Searching for low mass is also relevant(lower than highest mass limits as Z’)

95% CL exclusion 130 480 GeV‐

W’ (lepton + MET) arXiv:1108.1316

Using SSM W’ as a benchmark, decay to anelectron or a muon and a neutrino

Transverse mass as the discriminant variable

No excess found, observed (expected) mass limit from combination of both channels:

mW’ >2.15 TeV 95% C.L. limit

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Conclusion

Tentative upgrade schedule

1 fb-1 → 3000 fb-1

0.03% → 100% Good prospects for discoveries

Spare

Spare

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• Aplanarity: the smallest eigenvalue of the momentum

tensor• HT;3p : the transverse momentum of all but the

two leading jets, normalized to the sum of absolute values of all longitudinal momenta in the event

• The anti-kt algorithm constructs, for each input object (either energy cluster or particle) i, the quantities dij and

diB as follows: where kti is the transverse momentum of object i with

respect to the beam direction. A list containing all the dij and diB values is compiled. If the smallest entry is a dij, objects i

and j are combined (their four-vectors are added) and the list is updated. If the smallest entry is a diB, this object is considered

a complete ‘‘jet’’ and is removed from the list.

Combined performanceTRT Operation At High Occupancy (MEPhI, MSU)

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Momentum resolution as a function of centrality. Default reconstruction and new reconstruction parameters

J/PSI-> mm mass spectrum for the tracks with TRT extensions: 96.5% of all the events.

For these events mass resolution is by 10% better than for standard reconstruction.

New reconstruction parameters do not compromise track reconstruction but

allow to get complete TRT information on the particle track at any occupancy.

Applying 3 body cut one can select the signal

ET()>15 GeVMmm <82 GeVEtcone:20<3 GeVnucone20=0

Combined performancePhoton efficiency study based of FSR selection

in Z decay processes (MEPhI)

The main idea is to obtain a photon sample with maximum purity with the method decoupled from the standard

analysis methods. 3 body mass spectrum with constrains on the

mass of two leptons (Data and MC) Purity=Signal/(Signal+Background)

Photon Et [GeV]

Developed approach allows to obtain a sample of probe photons with a purity of about 97% for studies of the ATLAS photon response.

Combined performanceElectron reconstruction study (PNPI)

• Currently no special treatment of electrons within the tracking domain– All tracks are fitted using the pion particle hypothesis– No real attempt to correct for material effects therefore

• Modified Electron Reconstruction in e/γ – All tracks assigned to electrons are refitted with brem corrections– Gaussian Sum Filter for initial tests– Primary vertex information is used to create new TrackParticles

Tight electron Gain in efficiency ~3% in low pT and high

E/p distributions closer to 1 and with reduced tails

Data analysis Standard Model

SINP MSU

• D*±, D± and Ds± production x sections (ATLAS-CONF-2011-017)

• Comparison with FONLL and GM-VFNS predictions (ATL-PHYS-PUB-2011-012)

• In progress:• D*± and D± at 2.76 TeV

• D*±, D± and Ds± in high pT range

• Plan : combine the above results in a journal paper by the end 2011

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Data analysis Standard Model

• IHEP • Z-Boson Underlying

Events Studies• Take the Z-boson as

the leading object, and measure UE activity

with respect to the Z.

• To be completed in November

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Data analysisExotics

• IHEP – participation in:

– Invariant mass of jet pairs in association with a leptonically decaying W

– Motivated by CDF bump– ATL-COM-PHYS-2011-849– ATLAS-CONF-2011-097

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Data analysisExotics

• BINP in collaboration with Irvine, Pittsburg, Uppsala, Victoria groups

• Search for heavy Majorana neutrino and WR in dilepton plus jets events with the ATLAS detector in pp collisions at √S= 7 TeV

• ATLAS-CONF-2011-15

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Observed and expected 95% CL upper limits on the heavy Majorana neutrino and WR masses obtained from the cross-section times branching ratio limits. The no-mixing scenario is shown on the left, and in the 100% mixing scenario on the right. The excluded region is inside the solidhatched boundary.

Data analysisExotics

• PNPI group continue to participate into the searching for high mass gauge and excited boson (Z’ and Z*) decaying into electron-positron pair.

• Latest published results : exclusion of the SSM Z’ up to 1.70 TeV in the electron channel and up to 1.83 TeV in combination with muon channel. These results are accepted by Phys.Rev.Lett. Now results are updated up to ~3 fb-1.

• Goal for this year is to publish result with all available statistics (~5 fb-1) and establish confidence limit on Z’ and Z*.

The 95% C.L. exclusion limit for the SSM Z′ and several E6 Z ′ model are shown.

Dielectron invariant mass distribution after final selection, compared to the stacked sum of all expected backgrounds, with three example Z ∗ signals overlaid.

The comparison of the ATLAS result on Z’ exclusion with another experiments. The region above each curve is excluded at 95% confidence level.

• PNPI group participates in the work of Exotics Lepton+MET group (W/W*e decay channel) : • Running full analysis

• Providing cut flows and histograms • QCD data-driven estimation• Studies of systematics

• Limits for 95% CL were established for W’: 2.08 and 2.15 TeV for the electron channel and for the combination respectively.

• Publications: ·Note ATL-COM-PHYS-2011-471 for 205 pb-1 was published for PLHC;• Note ATL-COM-PHYS-2011-777 for 1 fb-1 was published for EPS;• Paper “Search for a heavy gauge boson decaying to a charged lepton and a neutrino

in 1 fb-1 of pp collisions at √s = 7 TeV using the ATLAS detector” was published in arXiv:1108.1316 and accepted in Physics Letters B.

The 95% C.L. exclusion limit for the SSM W′

The transverse mass spectrum for signal and background after final event selection for luminosity 1.04 pb-1

The comparison of the ATLAS result on W’ exclusion with another experiments at(95% confidence level).

Data analysisExotics

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ITEP • Paper based on 2010 data

“Limits on the production of the SM Higgs Boson production in pp collisions at 7 TeV with the ATLAS detector“, EPJC 71 (2011) 1728 (14 June 2011)

ITEP contribution: data/MC comparisons in Zμμ control region for HWWll νν mode in case of 2 jets, ATL-COM-PHYS-2010-1042

• Three CONF notes based on 2011 data (HWW decay) ATLAS-CONF-2011-111, 134 and 135 (July and August 2011)

ITEP contribution: impact of pile-up on jets in HWWll νν searches.Support material: ATL-COM-PHYS-2011-773

Main result for SM HWW searches:excluded at 95% CL in the mass range 154-186 GeV

Data analysis Higgs

The expected (dashed) and observed (solid) 95% CL upper limits on the cross-section, normalized to the SM cross-section

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•GasPixel Tracker/L1 track trigger for the ATLAS sLHC upgrade (MEPHI/NIKEF +…..)

•Fast MDT (IHEP/Michigan)•MDT Ø15 mm (IHEP/MPI…)

•Radiation hard scintillator (IHEP)

•LAr at high intensity (IHEP/BNPI/LPI/CERN/MPI/……)

•Augmented reality (IHEP/CERN)

ATLAS upgrade R&D