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IntroductionExotics at the LHCLow Hanging FruitBig Game Hunting
BSM TrawlingSummary
Outline
Exotic Searches at the LHC
James Ferrando
University of Glasgow
Higgs Maxwell WorkshopRoyal Society of Edinburgh
13th Feb, 2013
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BSM TrawlingSummary
OutlineOutline
Introduction
Overview of Searches
Conclusion and Outlook
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BSM TrawlingSummary
Introduction
Exotics (non-SUSY) Searches are a large part of the LHCProgramme:
47 (46) ATLAS (CMS) PublicationsIf something new had been found you would already knowabout it!
Easy for a talk discussing this wide programme to become afashion parade of exotic models and searches
Here I will present what I consider to be the edited highlights
Prefer to focus on the final states explored, rather than themodels excluded
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BSM TrawlingSummary
Introduction
The ATLAS and CMSdetectors at the LHC:
precise calorimetry:
Hadronic jetselectrons
Precise tracking:
Muonsb-jet tagging
Excellent solid-anglecoverage:
EmissT
Versatile detectors forfinding new physics in avariety of final states
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BSM TrawlingSummary
Luminosities
The LHC has beenperforming excellently since2010:
∼ 35 pb−1 of 7 TeV ppcollisions/experiment2010
∼ 5 fb−1 of 7 TeV ppcoliisions/experiment2011
∼ 20 fb−1 of 8 TeV ppcoliisions/experiment2012
Month in YearJan Apr Jul
Oct
]1
Deliv
ere
d L
um
inosity [fb
0
5
10
15
20
25
30
35
= 7 TeVs2010 pp
= 7 TeVs2011 pp
= 8 TeVs2012 pp
ATLAS Online Luminosity
Only one exotics publication (CMS) from 2012 data so far...
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BSM TrawlingSummary
Exploring TheUnknown
First go for thepotential earlydiscoveries:
large-cross-sectionprocessessimple final states
Then tougher targets:
smallercross-sectionscomplex signatures
Make sure to checkthe rest with:
model independentsearchesprecisionmeasurements
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BSM TrawlingSummary
dijetsl+ l−
lν
Low HangingFruit
First, the low hanging fruit:
large cross section:
dijets
simple (clean) final states
l+l−
lν
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BSM TrawlingSummary
dijetsl+ l−
lνDijets
ATLAS-CONF-2012-148 Search fornew physics in dijets13 fb−1 @ 8 TeV
Require two central jets|y | < 2.8
Reduce t-channel-like processes|y1,2| < 2.8, |y∗| < 0.6
|mjj | > 1000 GeV
Search for a bump in the mjj
spectrum
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BSM TrawlingSummary
dijetsl+ l−
lνDijets
limits set on excited quarkproduction
Furthermore model-independentlimits (assuming a Gaussiansignal) set
Application to set limits on NPmodels beyond those directlyconsidered is possible
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BSM TrawlingSummary
dijetsl+ l−
lνDijets
limits set on excited quarkproduction
Furthermore model-independentlimits (assuming a Gaussiansignal) set
Application to set limits on NPmodels beyond those directlyconsidered is possible
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BSM TrawlingSummary
dijetsl+ l−
lνl+l−
Another early search channel is l+l−:
Only 8 TeV Exotica publication(1212.6175) with 4 fb−1 by CMS
Select two high pT leptons
Search invariant mass spectrum
Set limits on models
ATLAS CONF note with 6 fb−1
also available(ATLAS-CONF-2012-129)
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BSM TrawlingSummary
dijetsl+ l−
lνl+l−
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BSM TrawlingSummary
dijetsl+ l−
lνl+l−
Usually slower to access: lν (EmissT )
CMS-PAS-EXO-12-010
Select a high-pT lepton
Require EmissT that balances plT
Search mT distribution forexcesses
e-channelµ-channel
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dijetsl+ l−
lνl+l−
Usually slower to access: lν (EmissT )
CMS-PAS-EXO-12-010
Select a high-pT lepton
Require EmissT that balances plT
Search mT distribution forexcesses
e-channelµ-channel
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BSM TrawlingSummary
dijetsl+ l−
lνl+l−
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BSM TrawlingSummary
τ searchesComplex Final StatesBoosted Objects
Big GameHunting
As data sets become better understood, more challenging quarrycan be approached:
Final states with τs and bs
Complex multi-object final states
Processes with very small expected cross sections
Final states with boosted heavy objects
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BSM TrawlingSummary
τ searchesComplex Final StatesBoosted Objects
τ+τ−
arXiv:1210.6604search for resonant τ+τ−:
Use four channels:
τhτh (42%)τhµ (23%)τhe (23%)eµ (6%)
Opposite charge τ candidates
Require τs back to back intransverse plane
Use MT to discriminate signaland background
) [GeV]missTE,
hadvisτ,
hadvisτ(tot
Tm
0 500 1000 1500
Eve
nts
/ 5
0 G
eV
310
210
110
1
10
210
310
410 ATLAS1
L dt = 4.6 fb∫ = 7 TeVs
(a) Data 2011Multijet
ττ→*γ/Z
ντ→W
Othersττ→(1250)Z’
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τ searchesComplex Final StatesBoosted Objects
τ+τ−
arXiv:1210.6604search for resonant τ+τ−:
Use four channels:
τhτh (42%)τhµ (23%)τhe (23%)eµ (6%)
Opposite charge τ candidates
Require τs back to back intransverse plane
Use MT to discriminate signaland background
) [GeV]missTE,
hadvisτ, µ(tot
Tm
0 500 1000 1500
Eve
nts
/ 5
0 G
eV
310
210
110
1
10
210
310
410 ATLAS1
L dt = 4.6 fb∫ = 7 TeVs
(b) Data 2011ττ→*γ/Z
+jetsW
Multijet
µµ→Z
tt
DibosonSingle top
ττ→(1000)Z’
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BSM TrawlingSummary
τ searchesComplex Final StatesBoosted Objects
τ+τ−
arXiv:1210.6604search for resonant τ+τ−:
Use four channels:
τhτh (42%)τhµ (23%)τhe (23%)eµ (6%)
Opposite charge τ candidates
Require τs back to back intransverse plane
Use MT to discriminate signaland background ) [GeV]
missTE,
hadvisτ, e(tot
Tm
0 500 1000 1500
Eve
nts
/ 5
0 G
eV
310
210
110
1
10
210
310
410 ATLAS1
L dt = 4.6 fb∫ = 7 TeVs
(c) Data 2011ττ→*γ/Z
+jetsZ/W
Multijet
ee→Z
tt
DibosonSingle top
ττ→(1000)Z’
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BSM TrawlingSummary
τ searchesComplex Final StatesBoosted Objects
τ+τ−
arXiv:1210.6604search for resonant τ+τ−:
Use four channels:
τhτh (42%)τhµ (23%)τhe (23%)eµ (6%)
Opposite charge τ candidates
Require τs back to back intransverse plane
Use MT to discriminate signaland background ) [GeV]
missTE, µ, e(tot
Tm
0 500 1000 1500
Eve
nts
/ 5
0 G
eV
310
210
110
1
10
210
310
410 ATLAS1
L dt = 4.6 fb∫ = 7 TeVs
(d) Data 2011ττ→*γ/Z
Dibosonµµ→Z
tt+jetsW
ττ→(750)Z’
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BSM TrawlingSummary
τ searchesComplex Final StatesBoosted Objects
τ+τ−
[GeV]Z’m
500 1000 1500
) [p
b]
ττ
→Z
’(
BR
×
) Z
’→
pp
(σ
310
210
110
1
ATLAS1
L dt = 4.6 fb∫ = 7 TeVs
Channels combined
(b) Expected limit
σ 1±Expected
σ 2±Expected
Observed limit
SSMZ’
th. uncert.SSMZ’
Channels arecombined to set across-section ×BRlimit onZ ′ → τ+τ−
SSM Z ′ used as abenchmark
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τ searchesComplex Final StatesBoosted Objects
t + X ,X → td
Example of a complex final state:top-associated new physics
Search for:pp → tX ,X → t+jet
looking for a top+jet resonance
Several proposed models likethis to account for largeTevaton AFB
Search focusses on W ′-likeparticles:
Color singlet tW ′,W ′ → t̄dDi-quark color triplett̄φ, φ→ tu
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τ searchesComplex Final StatesBoosted Objects
t + X ,X → td
arXiv:1209.6593Strategy:
Select tt̄ l+jets events in thestandard way
require an extra jet
Assign jets to top quarks usinga kinematic likelihood fitter
Exploit charge-asymmetry in NPproduction by looking at mtj vsmt̄j
500 1000 1500 2000 2500E
vent
s / 1
75 G
eV
1
10
210
310
410
-1 L dt = 4.7 fb∫Data
tt
W + jets
Other
W' 300 GeV
400 GeVφ
ATLAS
[GeV]tjm500 1000 1500 2000 2500
(dat
a-S
M)/
SM
-1-0.5
00.5
1 Uncertainty
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BSM TrawlingSummary
τ searchesComplex Final StatesBoosted Objects
t + X ,X → td
arXiv:1209.6593Strategy:
Select tt̄ l+jets events in thestandard way
require an extra jet
Assign jets to top quarks usinga kinematic likelihood fitter
Exploit charge-asymmetry in NPproduction by looking at mtj vsmt̄j
500 1000 1500 2000 2500E
vent
s / 1
75 G
eV
1
10
210
310
410 -1 L dt = 4.7 fb∫Data
tt
W + jets
Other
W' 300 GeV
400 GeVφ
ATLAS
[GeV]jt
m500 1000 1500 2000 2500
(dat
a-S
M)/
SM
-1-0.5
00.5
1 Uncertainty
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BSM TrawlingSummary
τ searchesComplex Final StatesBoosted Objects
t + X ,X → td
Limits on cross-section×BR:
W' mass [GeV]200 400 600 800 1000 1200 1400 1600 1800 2000
Cro
ss-S
ectio
n [p
b]
-110
1
10
210 = 1
R, gTheoryσ
= 2R
, gTheoryσ
Observed limitExpected limit
σ 1 ±σ 2 ±
=1R
CDF excluded, g
ATLAS
= 7 TeVs-1 L dt = 4.7 fb∫
mass [GeV]φ200 400 600 800 1000 1200 1400 1600 1800 2000
Cro
ss-S
ectio
n [p
b]-110
1
10
210 = 1
R, gTheoryσ
= 2R
, gTheoryσ
Observed limitExpected limit
σ 1 ±σ 2 ±
=1R
CDF excluded, g
ATLAS
= 7 TeVs-1 L dt = 4.7 fb∫
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BSM TrawlingSummary
τ searchesComplex Final StatesBoosted Objects
t + X ,X → td
Limits on cross-section×BR and also on allowed coupling (gR):
W' mass [GeV] 500 1000 1500 2000 2500
RC
oupl
ing
g
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
Expected exclusion
95% C.L. exclusion
CDF exclusion
(M. Gresham et al.)tt
σ and FB
Favored by Tevatron A
ATLAS-1 L dt = 4.7 fb∫
= 7 TeVs
mass [GeV]φ500 1000 1500 2000 2500
RC
oupl
ing
g
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
Expected exclusion
95% C.L. exclusion
CDF exclusion
(M. Gresham et al.)tt
σ and FB
Favored by Tevatron A
ATLAS-1 L dt = 4.7 fb∫
= 7 TeVs
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BSM TrawlingSummary
τ searchesComplex Final StatesBoosted Objects
Boosted Objects
When pushing to higher energies, new factors come into play:
Low Energy tops
t → bW ,W → qq′ gives threedistinct “jets”:
High Energy tops
top decay system is highly boostedand reconstructed as only one jet:
Need new techniques to identify these boosted objects
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BSM TrawlingSummary
τ searchesComplex Final StatesBoosted Objects
Z ′ → tt̄
An ideal test case is a search for high-mass particles decaying to tt̄:
Use the l+jets topology
lepton and EmissT cuts ensure sample is quite pure
Can search for new physics
can verify that jet substructure variables are well described
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BSM TrawlingSummary
τ searchesComplex Final StatesBoosted Objects
Z ′ → tt̄
ATLAS-CONF-2012-136
Search strategy adopted by ATLAS,combines two selections:
ResolvedleptonEmissT
≥ 3 jets≥ 1 b-jet
Boosted:leptonEmissT
≥ 1 large-R jet with pT > 350GeV and large jet-mass≥ 1 b-jet
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BSM TrawlingSummary
τ searchesComplex Final StatesBoosted Objects
Z ′ → tt̄
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BSM TrawlingSummary
τ searchesComplex Final StatesBoosted Objects
Z ′ → tt̄
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BSM TrawlingSummary
τ searchesComplex Final StatesBoosted Objects
Z ′ → tt̄
(ATLAS limit on a TC2 Z ′ compared to CMS fromarXiv:1209:4397 - both experiments can perform this kind ofsearch)
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BSM TrawlingSummary
New PhysicsTrawling
As well as relatively dedicated searches, there is an increasing trendtowards producing results that are more widely applicable:
Fiducial cross section limits
Limits associated with parametrised efficiency
Global searches for any discrepancies
These offer the chance to catch new physics that we hadn’tthought of and they give others the potential to test new modelsagaianst existing searches.
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BSM TrawlingSummary
l+l+
Many, many models predict signatures with same-sign leptons inthe final state, but
There’s probably no (insert model here)
So let’s stop over-optimising and enjoy setting fiducialcross-section limits
arXiv:1210.4358
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l+l+
Select events with like-signlepton pairs ee,µµ.eµ
in ee channel exclude masswindow around Z (largecharge-flip background there)
No requirement on EmissT
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l+l+
Evaluate efficiency infiducial region usingseveral models:
SS topH±±
WR → lNR
b′b′ →WtWt
Use most conservativechoice for fiducial limit
Alternative approach for 3lepton search in:arXiv:1211.6312:
σvis sections providedParametrised leptonefficiencies also given
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GeneralSearch
Making sure we don’t miss anything big: ATLAS-CONF-2012-107
Define physics objects:
electrons: pT > 25 GeV ,|η| < 2.47
muons : pT > 20 GeV ,|η| < 2.4
jets : pT > 50 GeV , |η| < 4.9
b-jets : b-tagged jet
photons : pT > 40 GeV ,|η| < 2.37
neutrinos : EmissT > 130 GeV
0 200 400 600 800 1000 1200 1400 1600 1800 2000
Events
/ 120 G
eV
210
110
1
10
210
310
410 = 7 TeV)sData 2011 (
SM Monte CarloWW,WZ,ZZ+jets
V, t+jetst, tttMultijet
Z+jets
W+jets
+jetsγ
ν1e2jµchannel: 11L dt = 4.7 fb∫
ATLAS Preliminary
EGamma Stream
pvalue = 0.12
[GeV]eff
m
0 200 400 600 800 1000 1200 1400 1600 1800 2000
Da
ta /
MC
1
2
3
4
Systematically look at all possiblemulti-object final states for regionsof largest discrepancy (655)
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BSM TrawlingSummary
GeneralSearch
(pvalue)10
log
0 1 2 3 4 5 6 7 8 9 10
Eve
nt
Cla
sse
s
210
110
1
10
210
= 7 TeV)sData 2011 (SM Toy ExperimentsSM+SU(660, 240)SM+SU(1220, 180)SM+SU(1220, 240)
1L dt = 4.7 fb∫
ATLAS Preliminary
Muon Stream
(Also there is an earlier CMS general search:CMS-PAS-EXO-10-021)
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BSM TrawlingSummary
SummarySummary
Mass scale [TeV]
-110 1 10 210
Oth
erE
xcit.
ferm
.N
ew q
uark
sLQ
V'
CI
Ext
ra d
imen
sion
s
jjmColor octet scalar : dijet resonance, µe
m, µ)=1) : SS eµe→L
±± (DY prod., BR(HL±±H ll
m), µµll)=1) : SS ee (→L
±± (DY prod., BR(HL±±H
(LRSM, no mixing) : 2-lep + jetsRWMajor. neutr. (LRSM, no mixing) : 2-lep + jets
,WZTmlll), νTechni-hadrons (LSTC) : WZ resonance (
µµee/mTechni-hadrons (LSTC) : dilepton, γl
m resonance, γExcited lepton : l-jjmExcited quarks : dijet resonance,
jetγm-jet resonance, γExcited quarks :
llqmVector-like quark : NC, qνlmVector-like quark : CC, )
T2 (dilepton, M0A
0 tt + A→Top partner : TT
Zbm Zb+X, →New quark b' : b'b'
WtWt→)5/3T5/3
generation : b'b'(Tth4 WbWb→ generation : t't'th4
jjντjj, ττ=1) : kin. vars. in βScalar LQ pair (jjνµjj, µµ=1) : kin. vars. in βScalar LQ pair (jjν=1) : kin. vars. in eejj, eβScalar LQ pair (µT,e/mW* : tb
m tb, SSM) : → (RW'tqm=1) :
R tq, g→W' (
µT,e/mW' (SSM) : ττmZ' (SSM) : µµee/mZ' (SSM) :
,missTEuutt CI : SS dilepton + jets + ll
m, µµqqll CI : ee & )
jjm(χqqqq contact interaction :
)jjm(χ
Quantum black hole : dijet, FT
pΣ=3) : leptons + jets, DM /THMADD BH (ch. part.N=3) : SS dimuon, DM /THMADD BH (
tt,boostedm l+jets, →tt (BR=0.925) : tt →
KKRS g
νlν,lTmRS1 : WW resonance, llll / lljjmRS1 : ZZ resonance,
/ llγγmRS1 : diphoton & dilepton, llm ED : dilepton, 2/Z1S
,missTEUED : diphoton + / llγγmLarge ED (ADD) : diphoton & dilepton,
,missTELarge ED (ADD) : monophoton + ,missTELarge ED (ADD) : monojet +
Scalar resonance mass1.86 TeV , 7 TeV [1210.1718]-1=4.8 fbL
massL±±H375 GeV , 7 TeV [1210.5070]-1=4.7 fbL
)µµ mass (limit at 398 GeV for L±±H409 GeV , 7 TeV [1210.5070]-1=4.7 fbL
(N) < 1.4 TeV)m mass (RW2.4 TeV , 7 TeV [1203.5420]-1=2.1 fbL
) = 2 TeV)R
(WmN mass (1.5 TeV , 7 TeV [1203.5420]-1=2.1 fbL
))T
ρ(m) = 1.1 T
(am, Wm) + Tπ(m) = T
ρ(m mass (T
ρ483 GeV , 7 TeV [1204.1648]-1=1.0 fbL
)W
) = MTπ(m) - Tω/T
ρ(m mass (Tω/T
ρ850 GeV , 7 TeV [1209.2535]-1=4.9-5.0 fbL
= m(l*))Λl* mass (2.2 TeV , 8 TeV [ATLAS-CONF-2012-146]-1=13.0 fbL
q* mass3.84 TeV , 8 TeV [ATLAS-CONF-2012-148]-1=13.0 fbL
q* mass2.46 TeV , 7 TeV [1112.3580]-1=2.1 fbL
)Q/mν = qQκVLQ mass (charge 2/3, coupling 1.08 TeV , 7 TeV [ATLAS-CONF-2012-137]-1=4.6 fbL
)Q/mν = qQκVLQ mass (charge -1/3, coupling 1.12 TeV , 7 TeV [ATLAS-CONF-2012-137]-1=4.6 fbL
) < 100 GeV)0
(AmT mass (483 GeV , 7 TeV [1209.4186]-1=4.7 fbL
b' mass400 GeV , 7 TeV [1204.1265]-1=2.0 fbL
) mass5/3
b' (T670 GeV , 7 TeV [ATLAS-CONF-2012-130]-1=4.7 fbL
t' mass656 GeV , 7 TeV [1210.5468]-1=4.7 fbL
gen. LQ massrd3538 GeV , 7 TeV [Preliminary]-1=4.7 fbL
gen. LQ massnd2685 GeV , 7 TeV [1203.3172]-1=1.0 fbL
gen. LQ massst1660 GeV , 7 TeV [1112.4828]-1=1.0 fbL
W* mass2.42 TeV , 7 TeV [1209.4446]-1=4.7 fbL
W' mass1.13 TeV , 7 TeV [1205.1016]-1=1.0 fbL
W' mass430 GeV , 7 TeV [1209.6593]-1=4.7 fbL
W' mass2.55 TeV , 7 TeV [1209.4446]-1=4.7 fbL
Z' mass1.4 TeV , 7 TeV [1210.6604]-1=4.7 fbL
Z' mass2.49 TeV , 8 TeV [ATLAS-CONF-2012-129]-1=5.9-6.1 fbL
Λ1.7 TeV , 7 TeV [1202.5520]-1=1.0 fbL
(constructive int.)Λ13.9 TeV , 7 TeV [1211.1150]-1=4.9-5.0 fbL
Λ7.8 TeV , 7 TeV [ATLAS-CONF-2012-038]-1=4.8 fbL
=6)δ (DM4.11 TeV , 7 TeV [1210.1718]-1=4.7 fbL
=6)δ (DM1.5 TeV , 7 TeV [1204.4646]-1=1.0 fbL
=6)δ (DM1.25 TeV , 7 TeV [1111.0080]-1=1.3 fbL
massKK
g1.9 TeV , 7 TeV [ATLAS-CONF-2012-136]-1=4.7 fbL
= 0.1)PlM/kGraviton mass (1.23 TeV , 7 TeV [1208.2880]-1=4.7 fbL
= 0.1)PlM/kGraviton mass (845 GeV , 7 TeV [1203.0718]-1=1.0 fbL
= 0.1)PlM/kGraviton mass (2.23 TeV , 7 TeV [1210.8389]-1=4.7-5.0 fbL
-1 ~ RKKM4.71 TeV , 7 TeV [1209.2535]-1=4.9-5.0 fbL
-1Compact. scale R1.41 TeV , 7 TeV [ATLAS-CONF-2012-072]-1=4.8 fbL
=3, NLO)δ (HLZ SM4.18 TeV , 7 TeV [1211.1150]-1=4.7 fbL
=2)δ (DM1.93 TeV , 7 TeV [1209.4625]-1=4.6 fbL
=2)δ (DM4.37 TeV , 7 TeV [1210.4491]-1=4.7 fbL
Only a selection of the available mass limits on new states or phenomena shown*
-1 = (1.0 - 13.0) fbLdt∫ = 7, 8 TeVs
ATLASPreliminary
ATLAS Exotics Searches* - 95% CL Lower Limits (Status: HCP 2012)
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BSM TrawlingSummary
SummaryConclusion
Wide range of NPsignatures explored
Extremely strongconstraints on manybenchmark models
Still no sign of newphysics
Plenty to explore inthe 8 TeV data
Need to lookeverywhere, surprisescan always be lurkingwhere you weren’texpecting them...
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IntroductionExotics at the LHCLow Hanging FruitBig Game Hunting
BSM TrawlingSummary
Summary... and finally
Both Collaborations pushing hard for new and updated results inthe next few weeks!
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New Heavy QuarksHeavy Quark SearchesAll hadronic search with HepTopTagger
Bonus features!
Extra slides and goodies follow...
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New Heavy QuarksHeavy Quark SearchesAll hadronic search with HepTopTagger
Heavy Quark Searches
Are Heavy quark searches in trouble?
yes - for the bog-standard chiral 4th generationno - for Vector-like quarks
Future of such searches is to explore the parameter space forVLQs
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New Heavy QuarksHeavy Quark SearchesAll hadronic search with HepTopTagger
Vector-LikeQuarks
Vector-like quarks are not your daddy’s quarks1:
Charges allowed−4/3,−1/3, 2/3, 5/3
both chiralities have the sametransformation properties underthe electroweak group
Don’t have Yukawa couplings toHiggs Bosons
Can decay to qW , qZ , qH
motivated by e.g.extra-dimension models,composite Higgs
“As good (or bad) a model as a sequential 4th generation”1See e.g. arXiv:0907:3155
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New HeavyQuarks
Still important parameter space to explore:2
2Figure from Juan-Antonio Aguilar-SaavedraJames Ferrando Exotic Searches at the LHC 39/ 45
New Heavy QuarksHeavy Quark SearchesAll hadronic search with HepTopTagger
New HeavyQuarks
Still important parameter space to explore:3
3Figure from Juan-Antonio Aguilar-SaavedraJames Ferrando Exotic Searches at the LHC 40/ 45
New Heavy QuarksHeavy Quark SearchesAll hadronic search with HepTopTagger
New Heavy Quarks
first generic heavy quark search form ATLAS arXiv:1210.5468:
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New Heavy QuarksHeavy Quark SearchesAll hadronic search with HepTopTagger
Average interactions per bunch crossing4 6 8 10 12 14
Top C
andid
ate
Mass [G
eV
]
160
162
164
166
168
170
172
174
176
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180
Data 2011
MCtt
ATLAS Preliminary
1 L dt = 4.7 fb∫
Technique based on HepTopTagger:Phys.Rev.Lett.104:111801,2010 (Pile-up resistant)
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New Heavy QuarksHeavy Quark SearchesAll hadronic search with HepTopTagger
Leading Top Candidate Mass [GeV]
140 150 160 170 180 190 200 210
Eve
nts
/ 2
Ge
V
0
20
40
60
80
100
120
140
160
180
200
Data 2011
= 0.8 pbσZ’ (1 TeV)
tt
QCD (data driven)
ATLAS Preliminary1
L dt = 4.7 fb∫
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New Heavy QuarksHeavy Quark SearchesAll hadronic search with HepTopTagger
DiTop Invariant Mass [GeV]
500 1000 1500 2000 2500 3000
Eve
nts
/ 1
00
Ge
V
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450
Data 2011
= 0.8 pbσZ’ (1 TeV)
tt
QCD (data driven)
ATLAS Preliminary1
L dt = 4.7 fb∫
DiTop Invariant Mass [GeV]
500 1000 1500 2000 2500 3000E
ve
nts
/ 1
00
Ge
V
110
1
10
210
310
Data 2011
= 0.8 pbσZ’ (1 TeV)
tt
QCD (data driven)
ATLAS Preliminary1
L dt = 4.7 fb∫
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New Heavy QuarksHeavy Quark SearchesAll hadronic search with HepTopTagger
Z’ mass [GeV]
500 1000 1500 2000 2500 3000
) [p
b]
t t
→ B
R(Z
’×
σ
110
1
10
210Obs. 95% CL upper limit
Exp. 95% CL upper limit
uncertaintyσExp. 1
uncertaintyσExp. 2
Leptophobic Z’
ATLAS Preliminary
1 = 4.70 fbdt L
∫
= 7 TeVs
KK gluon mass [GeV]
600 800 1000 1200 1400 1600 1800 2000)
[pb
]t
t→
KK
BR
(g×
σ
110
1
10
210
Obs. 95% CL upper limit
Exp. 95% CL upper limit
uncertaintyσExp. 1
uncertaintyσExp. 2
KaluzaKlein gluon
ATLAS Preliminary
1 = 4.70 fbdt L
∫
= 7 TeVs
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