susy experimental results from cms and...

SUSY Experimental Results from CMS and ATLAS

Kenichi HatakeyamaBaylor University

Review of Discovery Physics Results from ICHEPArgonne National Laboratory

July 17, 2012

Why SUSY Now?

Three very compelling reasons: Allows unification of gauge couplings Can predict a dark matter particle candidate Provide a solution to the hierarchy problem:

Light Higgs (125 GeV!?) needs new physics to stabilize mass

July 17, 2012 SUSY Experimental Results 2

Why SUSY Now?


Light Higgs (125 GeV!?) needs new physics to stabilize mass The contribution from a Dirac fermion loop diverges quadratically


Why SUSY Now?


Light Higgs (125 GeV!?) needs new physics to stabilize mass The contribution from a Dirac fermion loop diverges quadratically The contribution from opposite spin super-partners would cancel the

divergence resolving the hierarchy problem


SUSY Results from CMS+ATLAS

Many new results for ICHEP from CMS and ATLAS >=10 public notes or papers from both CMS and ATLAS ~15 talks on LHC SUSY-related searches in the parallel sessions

Not really possible to cover all these wonderful new results. For more details, visit CMS & ATLAS pages: https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsSUS https://twiki.cern.ch/twiki/bin/view/AtlasPublic/SupersymmetryPublicResults

or ICHEP SUSY session indico: https://indico.cern.ch/sessionDisplay.py?sessionId=65&confId=181298#20120705

In this talk, I will cover highlights from many results shown at ICHEP 2012, and let’s discuss where we are and where we are heading to.


https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsSUS�

https://twiki.cern.ch/twiki/bin/view/AtlasPublic/SupersymmetryPublicResults�

https://indico.cern.ch/sessionDisplay.py?sessionId=65&confId=181298�

SUSY Searches at the LHC

Many powerful “inclusive” searches have been pursued Searching in a broad

spectrum of new physics scenarios – main sensitivities to gluino/squark production

Different observables & search strategies have been used for complementarities and robustness

Some of them are even reaching to 3rd generation sparticles

More “targeted” searches also started to be very vigorously pursued 3rd generation sparticles, gaugino production, etc Difficult phase space (compressed spectra) and more SUSY scenarios


Cros

s Se

ctio

n (p

b)

Missing ET

Missing ET (MET) is the key variable for a majority of SUSY searches MET performance in ATLAS and CMS is comparable ATLAS (hadron) calorimeter performs better. CMS compensates using “particle-flow” technique


Eur. Phys. J. C72 (2012) 1844 J. Instrum.6 (2011) P09001

http://www.springerlink.com/content/wth8t04138vl0743/?MUD=MP�

http://iopscience.iop.org/1748-0221/6/09/P09001/�

MET with Pileups

Missing ET can be sensitive to pileup (additional pp) interactions Average pileup ~10 in 2011. Doubled in 2012. Both CMS and ATLAS have good modeling of pileup in simulation and

also reducing pileup effects


ATLAS talk @ Calor 2012

Number of reconstructed primary vertices

2011 data

CMS DPS-2012-013

http://cdsweb.cern.ch/record/1456344�






Inclusive Searches


More signal rate/more BG Smaller rate/more BG control

Both CMS & ATLAS have performed inclusive searches in various channels Inclusive searches cut on hadronic activities (HT, jet multiplicity) and MET-

like variables (MET, Meff, MHT, MET/√HT, MT2, αT, razor, etc) Searches with different lepton categories

Different BG compositions & less BG with more leptons Different sensitivities to a variety of SUSY scenarios

Adding b-jets lower backgrounds, become more sensitive SUSY 3rd gen squark production

Adding photons, taus allow to explore even more SUSY scenarios

All hadronic Single lepton OS dileptons SS dileptons Multileptons

• QCD• Z → νν• W+jets• ttbar

• W+jets• ttbar

• Z+jets• ttbar

• ZZ/ZW/WW• ttZ/W• Rare SM• ttbar

• ZZ/ZW/WW• ttZ/W• Rare SM

Hadronic Search in Jets + METSelection Search variables:

Other variable (CMS-SUS-12-002):

≥3 jets with |η|<2.5, pT>50 GeV Veto isolated e/mu

Suppress W & Top BGs Δφ(MHT,j1,2,3) > 0.5,0.5,0.3 (rad)

Suppress QCD background

Backgrounds QCD Top & W+jets Z(→νν)+jetsDetermined by data-driven techniques

May 9, 2011

CMS-SUS-12-011, arXiv:1207.1898

10

g~

q~

01χ

01χ

jj

j

j

q~

g~

HT: Characterize visible energy of the event

MHT: Object-based MET. Characterize energy carried by undetected particle.Classic, yet powerful.MT2: generalized MT for decay chains with two unobserved particles.MT2 peaks toward 0 and MT2<MET for QCD-like events.

https://cdsweb.cern.ch/record/1460434�


Hadronic Search in Jets + MET

May 9, 2011

CMS-SUS-12-011, arXiv:1207.1898

LM5*: m0=230GeV, m1/2=360 GeV, A0=0, tanβ=10, sign(μ)>0

11

MC-based backgrounds for illustration

Background estimation (data-driven): Z(→νν)+jets

γ+jets: remove γ, correct for Z(→νν)/γ

Z(→ll)+jets: remove ll, correct for Br(Z→νν/Z→ll)

Top & W(lν)+jets: lost leptons (escape e/μ vetos) or W→τ hadronicdecays Start with μ+jets sample Lost leptons: Correct for lepton

finding/losing probability Use e-μ universality

W→τ hadronic decays: Replace μ with hadronic τ

response function QCD: Smear the well-balance events

in QCD control sample


CMSSM / mSUGRA

Inclusive SUSY results have been conventionally shown in the context of “constrained” MSSM / mSUGRA

CMSSM has only 5 parameters: universal scalar and gauginomasses, m0, m1/2, A0, tanβ, sin(μ).

Very predictive; however, the universality constraints result in significant restrictions on possible SUSY particle mass spectra

Now, it’s common to interprete results in more general topology-based “simplified model”


m0, common scalar mass [GeV]m1/

2, c

omm

on g

augi

nom

ass

[GeV

]

m(gluino) > 720 GeVm(squark) > 1.2 TeV

Simplified Model (SMS) Focus on topology instead of underlying physics model Any model with same topology (parent particle mass, decay chain,

daughters mass) can be “easily” compared with experimental results. Building blocks that can be used to generalize to a more complete

‘model’-space

The gluino mass exclusions depends strongly on the LSP mass. The phase space in which

the LSP and gluino(mother) masses are close to each other (compress spectra = small ΔM) are much less constrained

May 9, 2011 13

g~

g~

LSP

LSP

arXiv:1207.1898 arXiv:1207.1798

jj

jj


http://arxiv.org/abs/1207.1798�

All Hadronic Search with 6-9 Jets Motivation

Analysis targeting models with longer decay chains: Many jets (≥6-9), Softer MET

Selection Events selected with multi-jet triggers Events with electron / muons vetoed Final selection variable is MET/ √HT

Backgrounds QCD multijet (inlcuding ttbar all hadronic), Leptonic

(W+jets, Z+jets, and semi-, fully-leptonic ttbar)


arXiv:1206.1760

http://arxiv.org/abs/1206.1760�

All Hadronic Search with 6-9 JetsBackground estimation QCD

MET/ √HT ~ MET significance: independent of jet multiplicity

MET/ √HT templates from low jet multiplicities

Low MET/ √HT used for normalization

Leptonic background Control regions are formed by requiring

leptons Use “transfer functions” (from MC) between

control and signal regins


g~

g~

LSP

LSP

tt

tt

1-lepton Search with 2-4 Jets

2 “hard”- lepton Signal Regions (SRs): Optimized for CMSSM/MSUGRA and models with large mass spectra. Higher pT thresholds for all objects, higher jet multiplicities, tight cuts on MET

Final discriminating variable Meffinc.

1 “soft”- lepton SR (new!): Optimized for models with compressed mass spectra. Low-pT thresholds for electrons (muons) and 2nd jet, high-pT leading jet (initial

state radiation), tight cuts on MET. Final discriminating variable MET / Meff.


MT: Transverse mass from lepton & MET

Meff : Sum over MET, pT of jetsMeff

inc: Sum over MET, pT of the lepton and all jets in the event.

ATLAS-CONF-2012-041 Selection

https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2012-041/�

1-lepton Search with 2-4 Jets

No significant excess

Interpretation in CMSSM and SMS with


m(squark) = m (gluino) ≤ 1200 GeV

“soft”- lepton “hard”- lepton

SS Dileptons with >=2 b Jets


Same-sign lepton pairs are classic SUSY searches Leptons from many SUSY decay chains:

chargino, neutralino, W, Z, sleptons… Low SM backgrounds

Adding b jets helps even more Lower backgrounds t→bW can give even more leptons

Selection ≥ 2 b-tagged jets with pT > 40 GeV Isolated same sign e or μ pair pT > 20 GeV

M(ll) > 8 GeV to reject b’s

Reject extra leptons consistent with Z’s MET > 30 GeV

Low cut possible with dilepton triggersUp to 4 leptons + 2 b jets

Gluino pair production with decays to real and virtual stops

Sbottom pair production or gluinodecays via sbottoms

CMS-SUS-12-017




Dominant Background ttbar (l+jets) with fake leptons: fake

ratio with isolation extrapolation Charge mis-reconstruction: use Z’s

for x-check. Apply to ttbar dileptons Rare SM processes with high pT

leptons & b-jets: estimate from MC



gluino virtual top squarks gluino on-shell top squarks

Sbottom pair production




Gluinos have been excluded with masses up to ~880 GeVLower limit on the bottom squark mass of 408 GeV


αT Search with 0,1,2,>=3 b’s

αT variable:

QCD: Peak around 0.5 and tail to lower αT

αT>0.55 → Strong suppression of QCD BG

Event Selection ≥2 jets with pT>50 GeV, |η|<3

Jet1 with|η|<2.5 & pT>100 GeV Veto isolated electrons, muons,

and photons 8 HT bins starting from 275 GeV Binned in 0, 1, 2, and >=3 b-tag bins


CMS-SUS-11-022, CMS-SUS-12-016



αT Search with 0,1,2,>=3 b’s

Background estimation A binned likelihood fit

using all control samples to maximize the total likelihood


for Z(νν)+jets

for top/W

for QCD

0 b-jet

2 b-jets• DataPredicted background

αT Search with 0,1,2,>=3 b’s Strong constraints on various SUSY topologies


7 TeV 7 TeV

7 TeV7 TeV

q~

q~

LSP

LSP

b~

b~

LSP

LSP

g~

g~

LSP

LSP

tt

tt

g~

g~

LSP

LSP

bb

bb

αT Search with 0,1,2,>=3 b’s Strong constraints on various SUSY topologies


7 TeV 7 TeV

7 TeV7 TeV 8 TeV!

q~

q~

LSP

LSP

b~

b~

LSP

LSP

g~

g~

LSP

LSP

tt

tt

g~

g~

LSP

LSP

tt

tt

Direct Stops in Inclusive Searches


Even inclusive searches started to become sensitive to direct stop production!

t~

t~

LSP

LSP

Search with “Razor’’ variables: MR & RDesigned to characterize pair-production of heavy particles. Combine all particles into two hemispheres, boost back to rest frame(see Will Reece’s talk at ICHEP for more details)

αT: CMS-SUS-11-022 Razor: CMS-SUS-12-009



Gluino Mediated Stop/Sbottom Search

Search for gluino mediated stop/sbottom production in the 0 lepton channel with >=3 b-jets

Multi-b jets enhance the sensitivity Various signal regions are optimized for a variety of pMSSM

scenarios Models with both stop (or sbottom) production and gluino production Models with gluino lighter than all squarks with gluino pair production

onlyJuly 17, 2012 SUSY Experimental Results 28

ATLAS-CONF-2012-058




2-bo

dy c

asca

de

deca

ys3-

body

cas

cade

de

cays



2-bo

dy c

asca

de

deca

ys3-

body

cas

cade

de

cays

Limits on gluino mass ~1 TeV

Direct Stop Search

From the hierarchy problem point of view, the scalar top should not be too heavy in order to cancel a large loop contribution from SM top. Strong reason to search for scalar top (stop) in dedicated searches!

The search strategy varies depending on its mass Heavy stop [>m(top)]

Signal:

Leptonic or hadronic top decays with extra MET

Light stop [<m(top)]:Signal: Top like decays via chargino.

Low pT leptons, and subsystem mass below 2m(top)


Direct Stop Search (1-lepton)

Search for stops decaying to top quark, one top decays leptonically

Selection Exactly 1 lepton >=4 jets with pT>80, 60, 40, 25 GeV >=1 b jet 130 GeV < m(jjj) < 205 GeV Define 5 different signal regions

Background estimation 3 main BG: ttbar (l+jets),

ttbar (dilepton), and W+jets simultaneous fit performed to three

control regions & one signal region


ATLAS-CONF-2012-073


Direct Stop Search (1-lepton)


Direct Stop Search (0-Lepton)

Search for stops decaying to top quark, both tops decay hadronically Expect 6 high pT jets Kinematic reconstruction of both tops is possible (no MET)

Top background estimated using CR (l+jets) SM theory, jet energy scale and jet energy resolution are dominant

uncertainties


ATLAS-CONF-2012-074


Direct Stop Search (0-Lepton)


SRA

SRB

Combined Stop Exclusion


Combined Stop Exclusion


Limits on stop mass up to 500 GeV!(Strongly depend on LSP mass)

Mass limits on gluinos and squarks have been pushed higher and higher. Direct production of gaugino may be dominant SUSY production at the LHC.

Typical signature: multiple leptons Searches with 2 and 3 leptons

Direct Gaugino Searches


2-leptons 3-leptons

Event Selection

Background Reducible: ttbar+fake lepton

Use efficiency / fake rate toobtain fake contribution in SR

Irreducible: WZFit for signal and WZ in SR and adedicated WZ-enhanced normalization region

Direct Gaugino Searches w/ 3 Leptons


ATLAS-CONF-2012-077


Searches with 2 Leptons Selection Backgrounds

Opposite sign (OS) ttbar, Z+jets, WW Extrapolate data control

regions to SR by MC Same sign (SS) Fakes from QCD,W+jets Data driven


Also direct sleptonproduction

MT2 cut for a pair ofof invisible decays

ATLAS-CONF-2012-076


Direct Gaugino Searches


3 leptpons 2 leptpons 2 leptpons

1st set of results/limits on direct EWKino/slepton production from LHC

Searches with TausMotivation Measured relic density (ΩDMh2~0.12)

suggests either sufficient annihilation

co-annihilation

In CMSSM, staus are typically the lightest sfermions At small m0 stau and LSP could be almost

mass degenerated Large co-annihilation cross section Cosmologically favored parameter region

Some SUSY scenarios predict dominant decays of EWKinos in taus

Signatures Typically ≥2 taus are produced → 2-taus low pT, low ID efficiency → 1 tau


S. Martin

K. MatchevR. Remington

Searches with Taus Selection

Tau ID for hadronically decaying taus1-tau Exactly 1 tau: pT > 15 GeV, |η| < 2.1 No isolated light leptons, pT > 10 GeV HT>400/600, MHT>250/400 GeV2-taus 2 jets: pT > 100 GeV, |η| < 3 |Δϕ(MHT, jet2)| > 0.5 >=2 taus: pT > 15 GeV, |η| < 2.1 ΔR(τ, jet1/2) > 0.3, ΔR(τ1, τ2) > 0.3 MHT > 250 GeV

BackgroundsW (⟶ 𝜏𝜈) + jets / ttbar / Z (⟶ 𝜈𝜈) + jets / Drell-Yan (⟶ 𝜏𝜏) + jets / QCD 1-tau: manly from real taus 2-taus: mainly from fake taus


CMS-SUS-12-004


Searches with Taus


CMSSM

1-tau

2-taus

SMS

1-tau and 2-tausearches are complementary

Stau NLSP GMSB

Gluino exclusinos up to~800 GeV

Gluino with massesbelow 860 GeV excluded

Searches with Photons + MET

Motivation Gauge mediated SUSY Large extra dimensions

Selection 1, 2 or more photons pT > 80 (40/25)

GeV and |eta| < 1.4 At least 1 (2) jets with pT > 30 GeV and

|eta| < 2.6 MET > 100 GeV

Backgrounds QCD: jet-γ mis ID, jet mis-

measurement W(eν)+γ: e-γ mis-ID


Bino-like NLSP

CMS-SUS-12-018


Searches with Photons + METBackground estimation QCD - 2γ:

Use kinematically similar control samples: QCD sample with 2 fake γ’s

Rescale γγ sample in MET < 20 GeV

QCD - 1γ: Samples with 1 γjet fake γjet normalized to γ spectrum for

photon

EWK backgrounds: Measure fake(e→γ) probability Compare Z→ee to Z→eγ events

for fake rate Inclusive electron spectrum scaled by

f(e→γ) to obtain EWK background


Bino-like NLSP

Wino-like NLSP

Stealth SUSY

Motivation SUSY requires hidden sector

to break supersymmetry Light hidden sector particles

can mediate decays to many low pT objects

Signatures Can include many b-jets,

photons, γjj resonances, long-lived particles etc


Search in events with γγ+<=4 jetsand large total energy ST

CMS-SUS-12-014


Motivation Some SUSY scenarios predict long

living gluino, stop, stau, slepton

Signatures Very long lifetime. SUSY particles

leave detector.→ Look for slow tracks

Long-Lived Particles


High mass from time-of-flight

• M(Stau) > 310 GeV (tanβ=5-20)• Pair-produced stable leptons > 297 GeV

ATLAS-CONF-2012-075


CMSSM Summary


CMSSM Summary from CMS


ICHEP 2012



ICHEP 2012

Fall 2011



ICHEP 2012

Fall 2011Moriond 2011



ICHEP 2012


Before LHCdata taking



ICHEP 2012



mh = 125 GeV?



ICHEP 2012



mh = 125 GeV?→ m1/2 >~ 2 TeV & m(gluino)=4-5 TeV

Very fine-tuned model…

Good that LHC experiments are using“simplified model” to map out the possible new physics phase space

ATLAS SUSY Search Summary


1 TeV



1 TeV

Many SUSY limits reaching/approaching 1 TeV.



1 TeV

Many SUSY limits reaching/approaching 1 TeV.

Direct stop and EWKinolimits just started to beplaced

CMS Search Summary with SMS


Limits much milder for compressed spectra!

3 bars fordifferentintermediateχ masses

Hadronic Searches Leptonic Searches

Summary


Summary ATLAS and CMS have presented a beautiful set of new results on

SUSY searches at ICHEP 2012.



SUSY searches at ICHEP 2012. Many new inclusive searches – all hadronic, leptonic, w/ b-tags,

w/ photons, w/ taus, … etc, etc. Searches started to place limits on direct stop & EWKino

production No convincing sign of SUSY signals yet. Where is SUSY hiding?






We have more to cover this year!






We have more to cover this year! Improved sensitivities in 2012 with higher √s and more data Only a handful of searches with 2012 data have made ICHEP. A lot

more data will come by the end of exntended data taking period (pp data taking until Dec 17. ~20 fb-1?)

Search methods have advanced through 2011 analyses, &still evolving. Variety of robust searches Sensitivities to stop, EWKino are rapidly ramping up.






We have more to cover this year! Improved sensitivities in 2012 with higher √s and more data Only a handful of searches with 2012 data have made ICHEP. A lot

more data will come by the end of exntended data taking period (pp data taking until Dec 17. ~20 fb-1?)

Search methods have advanced through 2011 analyses, &still evolving. Variety of robust searches Sensitivities to stop, EWKino are rapidly ramping up.


The SUSY is the next discovery frontier!

Backup

LHC Performance


Peak luminosity in 2012:~ 6.8 x1033 cm-2 s-1

Many thanks to the LHCteams and the manyothers who made thispossible!

2012 “certified”data for physics5.19 fb-1 (85%)

Pileup


CMS and ATLAS Detectors


ATLASCMS

Length : ~45 m Diameter : ~24 m Weight : ~ 7,000 tonsElectronic channels : ~ 108

Solenoid : 2 TAir-core toroids

Length : ~22 m Diameter : ~14 m Weight : ~ 12,500 tonsSolenoid : 4 TFe yokeCompact and modular

Excellent Standalone Muon DetectorExcellent EM Calorimeter

Particle Flow @ CMS

The PFlow algorithm is designed to: Reconstruct & identify all

particles: γ, e, μ, charged & neutral hadrons, pileup, and converted photons & nuclear interactions

Use a combination of all CMS subdetectors to get the best estimates of energy, direction, particle ID


Particle Flow @ CMS



Use a combination of all CMS subdetectors to get the best estimates of energy, direction, particle ID1. Associate hits within each

detector


HCALClusters

ECALClusters

Tracks

Particle Flow @ CMS




detector2. Link across detectors


HCALClusters

ECALClusters

Tracks

Particle Flow @ CMS




detector2. Link across detectors3. Particle ID and separation


HCALClusters

ECALClusters

TracksChargedHadrons

Electron

neutral hadron

Particle Flow @ CMS




detector2. Link across detectors3. Particle ID and separation

Used in most CMS searches


HCALClusters

ECALClusters

TracksChargedHadrons

Electron

neutral hadron

MET with Pileups

Missing ET can be sensitive to pileup (additional pp) interactions Average pileup ~10 in 2011. Doubled in 2012. Both CMS and ATLAS have good modeling of pileup in simulation and

also reducing pileup effects


Irene Vichou’s talk Calor 2012

Number of reconstructed primary vertices

2011 data

CMSSM / mSUGRA

Inclusive SUSY results have been conventionally shown in the context of “constrained” MSSM / mSUGRA

CMSSM has only 5 parameters: Universal scalar mass m0

Universal gaugino mass m1/2

Universal trilinear coupling A0

Ratio of 2 Higgs doublet VEV tanβ Sign of the Higgisino mixing

parameter sgn(μ)

Very predictive; however, the universality constraints result in significant restrictions on possible SUSY particle mass spectra

July 17, 2012 SUSY Experimental Results

~Now Just after theBing Band

S. Martin

RazorRazor search designed to discriminate heavy pair production

kinematically from SM backgrounds No assumptions on MET or details of decay chain


CM frame

• Two massive particles produced at rest (e.g. )

˜ q 1˜ q 2 j1

j2

˜ χ 10

˜ χ 20

2,1

2,12,1

2,1

~

22~

21

2

q

q

j

M

MM

Mp

χ−=

= ∆

j1

j2

˜ χ 10

˜ χ 20

Boost

R frame equalizes 3-momentum of the two jets = CM frame if no ISR

spRM ˆ2 == MR peaks for the signal at the mass scale of the heavy particle, MD

MR definition: signal Laboratory Frame

RazorRazor search designed to discriminate heavy pair production

kinematically from SM backgrounds No assumptions on Met or details of decay chain


CM frame

• Two jets back to back

Laboratory Frame

R frame equalizes 3-momentum of the two jets = CM frame if no ISR

MR definition: multijet background

spMR ˆ2 == MR falls steeply

j1

j2

j1

j2

Boost

Transverse MR has a kinematic edge of MD

221221

21221

21 )()(

)(||2||2 jjj

zjz

jz

jjz

jRj

RjR EEpp

pEpEppM

−−−

−==

Razor


For the signal, MR is a measure of the mass of the heavy particle and peaks at the scale of the production Maximum of scalar sum of the pT of the two jets is MD

The maximum value of MET is also MD

Real life: multi-jet events → define two hemispheres and combine jets into two mega-jets (force di-jet topology)

2).()|(| 2121 j

TjT

missT

jT

jT

missTR

T

ppEppEM

+−+

=

R

RT

MM

R ≡

MR peaks at mass scale MD

Razor (R) has a kinematic edge of 1, peaks at 0.5

Razor used to separate signal from background

R and MR Properties


CMS-SUS-12-005


“Box” Definitions and Fits


Find state BOXclassification based on lepton ID

Min

imum

R2

and

MR

set

by t

rigg

erre

quir

emen

tsExtended and unbinned maximumlikelihood fit performed in 2D R2-MRplane independently in each BOX

Background functionally extrapolated to signal region

Results


1D projections of 2D ML Fit – HAD Box

Model independent results showingdata/prediction compatibility

R2

MR

Observationsconsistent withSM expectations

R-parity Violating SUSY

Most SUSY models assume R-parity [=(-1)3(B-L)+2S] conservation Dark matter candidate Makes MSSM more predictive Prevent proton decays

(but only simultaneous violation of lepton and baryon numbers are forbidden)

Signatures Multileptons eμ resonances eμ continuum


LFV t-channel exchange of scalar quark

Neutral sneutrino decaying to e μ pair

Generic analysis sensitiveto many SUSY models

Multilepton Search

Selection SR1: At least 4 leptons with

MET>50 GeV SR2: SR1 + |mll-mZ|>10 GeV

for each l+l- pair


• For tanβ<40, gluino masses below1770 GeV are excluded.

ATLAS-CONF-2012-035


susy experimental results from cms and...

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