Äîêóìåíò âçÿò èç êýøà ïîèñêîâîé ìàøèíû. Àäðåñ îðèãèíàëüíîãî äîêóìåíòà : http://qfthep.sinp.msu.ru/talks2015/1435562095_QFTHEP-RFalla-v3.pdf Äàòà èçìåíåíèÿ: Mon Jun 29 10:14:55 2015 Äàòà èíäåêñèðîâàíèÿ: Sat Apr 9 23:31:42 2016 Êîäèðîâêà: IBM-866 Ïîèñêîâûå ñëîâà: m 35

Exotic Searches with ATLAS
QFTHEP 2015 Samara, Russia

Rebecca Falla on behalf of the ATLAS Collaboration


Motivation
Th ¼ ¼ ¼ ¼ ¼ e Standard Model has been very successful but there are still problems Dark Matter Mass hierarchy problem Neutrino masses Gravity ......

Exotic theories could hold the answers to these questions ¼ Supersymmetry? ¼ Extra dimensions? ¼ WIMPS as dark matter candidates? ¼ Seesaw mechanism? ¼ New TeV scale interactions or particles? ¼ .....?
2


ATLAS Exotics Searches* - 95% CL Exclusion
Status: March 2015
Model
ADD GKK + g /q ADD non-resonant ADD QBH q ADD QBH ADD BH high Ntrk ADD BH high pT ADD BH high multijet RS1 GKK RS1 GKK Bulk RS GKK ZZ qq Bulk RS GKK WW qq ïï Bulk RS GKK HH bbbb Bulk RS gKK t t 2UED / RPP SSM Z SSM Z SSM W EGM W WZ EGM W WZ qq HVT W WH bb LRSM WR t b LRSM WR t b CI qqqq CI qq CI uutt EFT D5 operator (Dirac) EFT D9 operator (Dirac) Scalar LQ 1st gen Scalar LQ 2nd gen Scalar LQ 3rd gen VLQ VLQ VLQ VLQ

,
2e , ² 1 e, ²

Jets E

miss T

L dt[fb-1 ]
20.3 20.3 20.3 20.3 20.3 20.3 20.3 20.3 20.3 20.3 20.3 19.5 20.3 20.3 20.3 19.5 20.3 20.3 20.3 20.3 20.3 20.3 17.3 20.3 20.3 20.3 20.3 1.0 1.0 4.7 20.3 20.3 20.3 20.3 20.3 20.3 20.3 4.7 13.0 20.3 20.3 2.1 20.3 20.3 20.3 20.3 2.0
MD MS Mth Mth Mth Mth Mth GKK mass GKK mass GKK mass W mass GKK mass gKK mass
KK mass

Mass limit
5.25 TeV 4.7 TeV 5.2 TeV 5.82 TeV 4.7 TeV 5.8 TeV 5.8 TeV 2.68 TeV 2.66 TeV 740 GeV 700 GeV 590-710 GeV 2.2 TeV 960 GeV 2.9 TeV 2.02 TeV 3.24 TeV 1.52 TeV 1.59 TeV 1.47 TeV 1.92 TeV 1.76 TeV

L dt = (1.0 - 20.3) fb
n n n n n n n k k k k k = = = = = = = / / / / / 2 3 6 6 6 6 6

ATLAS
-1

Preliminar y

s = 7, 8 TeV

Reference
1502.01518 1407.2410 1311.2006 1407.1376

1j - 1j 2j - 2 ² (SS) - 1 e, ² 2j 2j - 2 e, ² - 2 - 2 e, ² 2j/1J 1 e, ² 2j/1J - 4b 1 e , ² 1 b, 1J/2j 2 e , ² (SS) 1 b, 1 j -
2e 2 1e 3e 2e 1e 1e 0e

Yes

- - - - - - - - - Yes - Yes Yes - - Yes Yes - Yes Yes - - - Yes
Yes Yes

HLZ

Extra dimensions

, MD = 3 TeV, non-rot BH , MD = 3 TeV, non-rot BH , MD = 3 TeV, non-rot BH

1308.4075 1405.4254 Preliminar y 1405.4123 Preliminar y 1409.6190 1503.04677 ATLAS-CONF-2014-005 ATLAS-CONF-2015-009 Preliminar y 1405.4123 1502.07177 1407.7494 1406.4456 1409.6190 Preliminar y 1410.4103 1408.0886

M M M M M

Pl Pl Pl Pl Pl

= = = = =

0 0 1 1 1

.1 .1 .0 .0 .0

BR = 0.925



,² ,² ,² ,² ,² ,² ,²

- - - - 2j/1J 2b 2 b, 0-1 j 1 b, 1 J

Z Z W W W W W W M M

Gauge bosons

mass mass


mass mass mass mass mass mass

gV = 1

2j - 2 e, ² - 2 e , ² (SS) 1 b, 1 j 0 e, ² 0 e, ² 2e 2² 1 e , ², 1 1e 2/3 2/3 1e 1e

CI

12.0 TeV 4.35 TeV




LL

21.6 TeV
|CLL | = 1

= -1

Preliminar y



LL

= -1

1407.2410 Preliminar y 1502.01518 1309.4017 1112.4828 1203.3172 1303.0526 ATLAS-CONF-2015-012 1409.5500 1409.5500 Preliminar y Preliminar y

1j 1 J, 1 j 2j 2j 1 b, 1 j 3j b b 5j 5j

DM

974 GeV 2.4 TeV 660 GeV 685 GeV 534 GeV 785 GeV 735 GeV 755 GeV 640 GeV 840 GeV 3.5 TeV 4.09 TeV 870 GeV 2.2 TeV 1.6 TeV 960 GeV 1.5 TeV 551 GeV 400 GeV 657 GeV 785 GeV 862 GeV

at 90% CL for m() < 100 GeV at 90% CL for m() < 100 GeV

- - -
Yes

LQ

LQ mass LQ mass LQ mass

=1 =1 =1
isospin singlet T in (T,B) doublet B in (B,Y) doublet isospin singlet

T5/

3

TT TT BB BB Wt

Ht Zt Zb Wt

+ X , Wb + X +X +X +X q qg Wt W , Z

Excited Excited Excited Excited Excited

quark quark quark lepton lepton

q q b

,² 1 b, e, ² 2/1 e, ² 2/1 ,² 1 b, ,² 1 b,

- - Yes Yes

T T B B T

Heavy quarks

mass mass mass mass 5/3 mass

1j - 2j - - 1 or 2 e , ² 1 b, 2 j or 1 j Yes 2 e , ², 1 - - 3 e , ², - - 1 1 e , ², 1 2 e, ² 2 e , ² (SS) 3 e , ², 1 e, ²

Excited fermions

q mass q mass b mass mass mass aT mass N0 mass H‘‘ mass H‘‘ mass
spin-1 invisible par ticle mass multi-charged par ticle mass monopole mass

only u and d , = m(q ) only u and d , = m(q ) left-handed coupling

1309.3230 1407.1376 1301.1583 1308.1364 1411.2921 1407.8150

= 2.2 TeV = 1.6 TeV

LSTC aT W LRSM Majorana Higgs triplet H ‘‘ Higgs triplet H ‘‘ Monotop (non-res prod) Multi-charged par ticles Magnetic monopoles

- -

s = 7 TeV

- 2j - - 1b - -

Yes



- - - Yes - -

m(WR ) = 2 TeV, no mixing ‘‘ DY production, BR(HL )=1 ‘‘ DY production, BR(HL )=1 anon-res = 0.2 DY production, |q | = 5e DY production, |g | = 1gD

1203.5420 1412.0237 1411.2921 1410.5404 Preliminar y 1207.6411

Other

s = 8 TeV

10

-1

1

10

Mass scale [TeV]

*Only a selection of the available mass limits on new states or phenomena is shown.

From March 2015

3


Outline
I'll be showing recent exotic search results from ATLAS: Long Lived Particle Searches H + MET VLQ in Lepton + jets HZ(d)Zd4l Z + lepton -HHbbbb tt resonances in lepton + jets Diboson resonances in boosted boson tagged jets All results shown are from 2012 s = 8 TeV data, made public in May and June 2015. There are many more results which can be found here
4


Long Lived Particle Searches
Many new physics models give rise to new, massive particles with long lifetimes LLPs can arise in models with: ¼ Small coupling in decay chain ¼ Strong virtuality (decay to heavy particles) ¼ Small mass differences in decay chain ¼ Pair production of particles with conserved quantum numbers Th ¼ ¼ ¼ ¼ ¼ ¼ ¼ ¼ ese lead to signatures which we can look for: Non-pointing or delayed photons Out-of-time decays Lepton jets Large dE/dx Disappearing tracks Displaced jets/vertices Trackless jets ...

5


Long Lived Particle Searches Summary

6


arXiv:1506.01081

Search for Dark Matter in H() + MET
DM invisible to detector ¼ Uses H to tag and trigger ¼ Look for large MET and local excess of events in m spectrum near mH Main Cuts: 105 < m < 160 GeV, MET > 90 GeV Backgrounds: ¼ SM Higgs bkgd from MC ¼ Continuum bkgds from m sideband
Number of events 107 10 10
6 5

q, g

H

H, Z, , Z ,S,... q, g

Events / GeV

9 8 7 6 5 4 3 2 1
Data ATLAS Total -1 s = 8 TeV, L dt = 20.3 fb Best-fit BSM Higgs miss H + ET , H , mH = 125.4 GeV SM Higgs Background fit

ATLAS


tt + diboson Z

+ jets
SM H Data

W/Z + X W



L dt = 20.3 fb-1 s = 8 TeV

104 103 10
2

10 1 10
-1

10-2 0 50 100 150 200 250 E
miss T

300 [GeV]

0

110

120

130

140

150 160 m [GeV]

7


arXiv:1506.01081

Search for Dark Matter in H() + MET
1.4 excess observed relative to expected limit ¼ Observed (expected) upper limit on the fid is 0.70 (0.43) fb at 95% CL

Mass scale [GeV]

104 103 10
2

ATLAS s = 8 TeV L dt = 20.3 fb H + ET
miss

-1

H+ D² H

²

Coupling gq

105
, H
LUX

104 103
ATLAS

Z'B , mZ'=1 TeV
s = 8 TeV L dt = 20.3 fb miss H + ET , H
-1

10

2

10
BF(Z inv)

1 10-1

Monojet (g=1)

10 1

Non-perturbative (g>4 )

No truncation Trunc. g=4 Trunc. g=1

10-2 10-3
LUX

1

10

10

2

10 m [GeV]

3

10-4

1

10

102

103 m [GeV]

8


arXiv:1505.04306

Search for Vector Like Quark pairs and 4t in the lepton + jets final state
Events / 150 GeV

VLQs cancel out quadratic divergences to the Higgs Boson mass ¼ Decays: TWb,Zt,Ht BWt,Zb,Hb _ _ 70 ATLAS 20.3 fb , s = 8 TeV 3 Analyses performed: TTWb + X, TTHt + X _ -60 and tttt production, BB Hb + X
-1

TTWb + X ¼ Reconstruct T mass using boosted W bosons and b-tagged jets
g T b

_

50 40 30 20 10

Data + TTW bW b (600) TT (600) singlet tt Non-tt Total Bkg unc.

Wb+X, tight

Data / Bkg

W

+

0

2 1 0 200 400 600 800 1000

ï T g

W -,H, Z

ï t, t b, ï ï

mreco [GeV]

9


arXiv:1505.04306

Search for Vector Like Quark pairs and 4t in the lepton + jets final state
Events / 100 GeV

VLQs cancel out quadratic divergences to the Higgs Boson mass ¼ Decays: TWb,Zt,Ht BWt,Zb,Hb _ _ 400 ATLAS 3 Analyses performed: TTWb + X, TTHt + X _ 20.3 fb , s=8 TeV -350 and tttt production, BB Hb + X 6 j, 3 b, M > 100
-1

Data t t +light-jets t t +cc t t +bb ttV ttH Non-tt Total Bkg unc.

-TTHt + X and tttt production _ ¼ Dominant decay is Hbb ¼ Focus on high jet & b-jet multiplicities ¼ Use HT as discriminant: (jet pT, lepton pT, MET) ¼ Also used to set limits on 4t production in several benchmark scenarios
g T t

_

min R bb

GeV

300 250 200 150 100 50 0 1.5 1.25 1 0.75 0.5 0

Post-fit

Ht+X

H

Data / Bkg

500

1000

1500

2000

ï T g

W -,H, Z

HT [GeV]

ï t, t b, ï ï

10


arXiv:1505.04306

Search for Vector Like Quark pairs and 4t in the lepton + jets final state
Events / 100 GeV

VLQs cancel out quadratic divergences to the Higgs Boson mass ¼ Decays: TWb,Zt,Ht BWt,Zb,Hb _ _ 8 ATLAS 3 Analyses performed: TTWb + X, TTHt + X _ 20.3 fb , s=8 TeV -7 and tttt production, BB Hb + X 6 j, 4 b, M >
-1

Data t t +light-jets t t +cc t t +bb ttV ttH Non-t t Total Bkg unc.

BB Hb + X ¼ Same strategy as Ht + X but optimised for BHb _ _ __ ¼ Look at BBHbHb(WW)b(bb)b where one W decays leptonically
g B b

_

min R bb

100 GeV

6 5 4 3 2 1
0 2 1.5 1 0.5 0

Post-fit

Hb+X

H

Data / Bkg

ï B g

W +,H, Z

500

1000

1500

2000

HT [GeV]

ï b, b t, ï ï

11


arXiv:1505.04306

Search for Vector Like Quark pairs and 4t in the lepton + jets final state
(pp TT) [pb]

(pp TT) [pb]

(pp BB) [pb]

ATLAS
10

Theory (NNLO prediction ‘1) 95% CL observed limit 95% CL expected limit 95% CL expected limit ‘1

ATLAS
10

Theory (NNLO prediction ‘1) 95% CL observed limit 95% CL expected limit 95% CL expected limit ‘1

102

ATLAS

Theory (NNLO prediction ‘1) 95% CL observed limit

10

95% CL expected limit 95% CL expected limit ‘1 95% CL expected limit ‘2

1

95% CL expected limit ‘2

1

95% CL expected limit ‘2

1 10-1 10-1 10-2

10-1

10-2

Wb+X s = 8 TeV, 20.3 fb-1 BR(T Wb)=1
10 300
-3

Ht+X, Wb+X combination s = 8 TeV, 20.3 fb-1 SU(2) singlet
10 300
-3

10-2

Hb+X s = 8 TeV, 20.3 fb-1 BR(B Hb)=1
700 800 900 1000

400

500

600

700

800

900 1000 1100

400

500

600

700

800

900 1000 1100

300

400

500

600

mT [GeV]
BR(B Hb)

mT [GeV]
Observed 95% CL mass limit [GeV]
Observed 95% CL mass limit [GeV] 950 1 0.9 0.8 650 0.7 0.6 0.5 0.4 0.3 0.2 0.1
800 700

mB [GeV]
950 900 850 800 750 700 650

BR(T Ht)

1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1
750

ATLAS
s = 8 TeV, 20.3 fb-1 Summary results: Same-Sign dil.
arXiv:1504.04605

900 850 800 750 700 650

ATLAS
s = 8 TeV, 20.3 fb-1 Summary results: Same-Sign dil.
arXiv:1504.04605

900

Zb/t + X
JHEP11(2014)104

Zb/t + X
JHEP11(2014)104

See also: Same-Sign dilepton, arXiv:1504.04605 Zb/t + X, JHEP11(2014)104 Wt + X, arXiv:1503.05425 12

Ht+X,Wb+X comb.
arXiv:1505.04306

Wt+X
arXiv:1503.05425

850

Hb+X
750 750
arXiv:1505.04306

800

600 550 500

600 550 500

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 BR(T Wb)

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 BR(B Wt)


arXiv:1505.07645

Events/ 2 GeV

Search for new light gauge bosons in HZ(d)Zd4l
8 7 6 5 4 3 2 1 0 0 10 20 30 40 50 60 mH=125 GeV

ATLAS
H ZZ* 4l ZZ* 4l Z+jets, tt Data 2012

The presence of a dark sector which couples to the SM can be inferred from exotic intermediate decays of Higgs Bosons ¼ Looking for HZZd/ZdZd4l (l = e/²) HZZd4l: ¼ Define m12 as invariant mass of opp. Sign, same flavour lepton pair with m closest to Z boson ¼ m34 is invariant mass of remaining pair ¼ Look for local excess in m34

s=8 TeV, 20.7 fb

-1

70

80

90

100

m34 [GeV]

95% CL upper limit on R

10
ATLAS s=8 TeV, 20.7 fb
-1

B

1

Observed Expected ‘ 1 ‘ 2

RB =

BR( H ZZ d 4l ) BR( H 4l )

10-1

10-2 15

20

25

30

35

40

45

50
d

55

13

mZ [GeV]


arXiv:1505.07645

Events / 5 GeV

Search for new light gauge bosons in HZ(d)Zd4l
107 105 103 10 10- 10-
1

ATLAS

Final state : 4e+4² +2e2² Data 2012 ZZ* -> 4l H->ZZ*->4l WW,WZ tt Zbb, Z+jets (Z+) quarkonium Total background

s = 8 TeV, 20.3 fb

-1

mH = 125 GeV

Significance

The presence of a dark sector which couples to the SM can be inferred from exotic intermediate decays of Higgs Bosons ¼ Looking for HZZd/ZdZd4l (l = e/²) HZdZd4l: ¼ Events are selected by requiring the difference in invariant mass of the dilepton pairs is minimized ¼ Upper limits are computed from a maximum likelihood fit

3

4 2 0 -2 -4

0

5

10

15

20

25

30

35

40

95% CL Upper Bound on ²d

0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.00 15 20 25 30 35 40 45 50 ATLAS s = 8TeV, 20.3 fb
-1

| m| [GeV]

45

50

Final State: 4e+2e2²+4²
Observed Expected ‘1 ‘2

½ BR( H Z d Z d 4l ) ²d = [ ½ BR( H ZZ * 4l )]SM

55 60 mZd [GeV]

14


arXiv:1506.01291

Search for heavy lepton resonances in Z + lepton events
Many extensions to the SM predict heavy resonances in trileptons ¼ Seesaw ¼ Vector Like Leptons Searching for heavy leptons, L ,N which decay to W/Z/H + l/ (depending on charge)
0 +,Lq Z L
+

l l

+

-

Z/



l

+

, l-,l L q
-

-

W - ,Z,H

Looking in L l+Z(ll) channel Look for 3 leptons with 1 Z candidate, reconstruct mL from invariant mass of the 3 leptons and use M m3l í mZ as discriminating variable Use 6 signal regions depending on 3rd lepton flavour and other side of event: 4l, 3l+jj, 3l-only Backgrounds: WZ, ZZ and DY Z+ taken from MC. Other bkgds are constrained from scaling control samples in data 15


arXiv:1506.01291

Search for heavy lepton resonances in Z + lepton events
Events / 10 GeV 8 7 6 5 4 3 2 1 0 0 50 100 150 200 250 300 350
Events / 10 GeV
16 14 12 10 8 6 4 2 0 0 50 100 150 200 250 300 350 400 450 500 m [GeV]

s=8 TeV, 20.3 fb 4l SR, Z+e

-1

ATLAS
Data ZZ4l tt+V VVV
*

s=8 TeV, 20.3 fb 3l+jj SR, Z+e

-1

ATLAS
Data WZ lll ZZ4l tt+V Z+ Reducible VVV
*

WZ lll VLL, 140 GeV Seesaw, 300 GeV

VLL, 140 GeV Seesaw, 300 GeV

m [GeV]

95% CL Limit on [fb]

10

3

ATLAS s = 8 TeV, 20.3 fb-1 VLL, Z+e

Expected ‘1 ‘2 Observed Theor. Cross Section

95% CL Limit on [pb]

Expected ‘1 ‘2 Observed Theor. Cross Section

1

102

10-1

10-2

ATLAS s = 8 TeV, 20.3 fb-1 Seesaw, Z+e

100

150

200

250

300 mL‘ [GeV]

100

200

300

400

500 mL‘ [GeV]

16


Boosted Methods
__ Example: Xhhbbbb b _ b b h X h _ b

b h Low h pT (low mX) h High h pT (high mX) boost Rule of thumb for angular separation between decay products: b _ b

_ b

2m R pT

17


arXiv:1506.00285

Higgs Boson Pair Production in the bbbb Final State
New physics models predict enhanced Higgs Boson pair production rates over the SM Boosted Higgs gives clear event topology _ Large BR(Hbb) means that the 4b final state happens ~ of the time Analysis based on two complementary approaches í resolved and boosted
Acceptance x Efficiency

__

0.2
Resolved Analysis
4 b-tagged jets Signal Region

Boosted Analysis
4 b-tagged jets Signal Region

Bulk RS, k/ M Pl = 1.0 ATLAS Simulation s = 8 TeV

0.15

0.1

0.05

500

1000

1500

2000 mG* [GeV]
KK

18


arXiv:1506.00285

Higgs Boson Pair Production in the bbbb Final State
Events / 20 GeV
16 14 12 10 8 6 4 2

__



ATLAS s = 8 TeV -1 Ldt = 19.5 fb

Signal Region Data Multijet tt Syst+Stat Uncertainty G*(700), k/MPl = 1.0 G*(1000), k/MPl = 1.0, ½ 3

Events / 50 GeV

18

12 10 8 6 4 2



ATLAS s = 8 TeV -1 Ldt = 19.5 fb

Signal Region Data Multijet tt Syst+Stat Uncertainty G*(1000), k/MPl = 1.0, ½ 2 G*(1500), k/MPl = 1.0, ½ 15

Data / Bkgd

5 400 4 3 2 1 0 400

600

800

1000

1200

1400

1600

Data / Bkgd

5 600 4 3 2 1 0 600

800

1000

1200

1400

1600

1800

2000

m4j [GeV]
600 800 1000 1200 1400 1600

m2J [GeV]
800 1000 1200 1400
KK

m4j [GeV]

1600

1800

2000

hh bbbb) [fb]

m2J [GeV]

ATLAS s = 8 TeV 102



Ldt = 19.5 fb

-1

Bulk RS, k/MPl = 1.0 Observed Limit (95% CL) Expected Limit (95% CL) Expected ‘1 Expected ‘2

ï k/M 1.0 1.5 2.0

Pl

95% CL Excluded G 500

Mass Range [GeV] 910

500 720 800 and 870 500 990

KK

10

1

600

800

1000

1200

1400

1600

1800 2000 mG* [GeV]
KK

Upper limit on SM hh non-resonant production, __ (pphhbbbb) = 202 fb (95% CL) [SM prediction of 3.6 ‘ 0.5 fb] 19 World's best limit!!

(pp G*


arXiv:1505.07018

tt Resonances using lepton + jet events
Many extensions to the SM predict heavy resonances with large BR to top-pairs Lepton + jets final state has large BR & also good background discrimination Analysis based on two approaches "resolved" and "boosted". If event fails boosted try resolved. ¼ Resolved: 1 lepton, 4 small radius jets, 1 b-tagged jet, MET > 20 GeV, MET + mT > 60 GeV ¼ Boosted: same as resolved but require a trimmed Anti-KT 1.0 jet pT > 300 GeV, m > 100 GeV No excesses found so limits on masses and cross-sections were made ¼ Observed limits exclude mZ' < 1.8 TeV and mgKK < 2.2 TeV
Events/0.08 TeV
108 107 106 105 104 103 102 10 1
ATLAS s=8 TeV, 20.3 fb l+jets
-1

_

Data SM tt SM W+jets Other SM g 2.0 TeV, 15.3% KK g 0.8 TeV, 15.3%
KK

Data/BG

20 1 0 0

0.5

1

1.5

2

2.5

3

3.5

0.5

1

1.5

2

2.5

3

3.5

mreco [TeV] tt
Z' ½ BR(Z' tt) [pb]
ATLAS s=8 TeV, 20.3 fb-1

103 102 10 1 10-1 10-2

Obs. 95% CL upper limit Exp. 95% CL upper limit Exp. 1 uncertainty Exp. 2 uncertainty Leptophobic Z'(1.2%) (LO x 1.3) Leptophobic Z'(2%) (LO x 1.3) Leptophobic Z'(3%) (LO x 1.3)

0.5

1

1.5

2

2.5

3

20

Z' mass [TeV]


arXiv:1506.00962

Fraction of jets / 0.05

High Mass Diboson Resonances with BosonTagged Jets
0.35 0.3 ATLAS Simulation s = 8 TeV
W'

EGM W' WZ (m = 1.8 TeV) Pythia QCD dijet

0.25 0.2 0.15 0.1 0.05 0 0 0.1 0.2 0.3 0.4

Many extensions to the SM predict high mass resonances in dibosons ¼ Bulk-RS graviton WW/ZZ ¼ Extended gauge model: W' WZ All hadronic final state has large BR compared to leptonic and semileptonic decays Boosted boson tagging to suppress backgrounds ¼ 2 C/A 1.2 jets with m2J > 1.05 TeV ¼ y 0.45, ntrack < 30, |mj - mV| < 13 GeV

| y | jj | | < j 1.62 60

< 1.2 2 mjj < 1.98 TeV mj < 110 GeV

0.5

0.6

0.7

0.8

0.9 1 Jet y

Fraction of jets / 3

0.25 ATLAS Simulation s = 8 TeV
EGM W' WZ (m = 1.8 TeV)
W'

0.2

Pythia QCD dijet

0.15 0.1

| y | jj | | < j 1.62 60 y>

< 1.2 2 mjj < 1.98 TeV mj < 110 GeV 0.45

0.05 0 0
Fraction of jets / 5.0 GeV

20

40

60

80 100 120 Jet ungroomed ntrk
G

0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 0

Search for bumps on steeply falling background ¼ Background taken from fit to data ¼ Signal shape from MC

ATLAS Simulation s = 8 TeV

bulk GRS WW (m = 1.8 TeV) bulk GRS ZZ (m = 1.8 TeV)
G

Pythia QCD dijet

| y | jj | | < j 1.62 y>

< 1.2 2 mjj < 1.98 TeV 0.45

21
0.05 0.1 0.15 0.2 0.25 0.3 0.35 mj [TeV]


arXiv:1506.00962

Local p

High Mass Diboson Resonances with BosonTagged Jets
0

10 1

ATLAS s=8TeV, 20.3 fb

WZ Selection

-1

WW Selection ZZ Selection

Events / 100 GeV

104 ATLAS 10
3

s = 8 TeV, 20.3 fb-1

102 10

Data Background model 1.5 TeV EGM W', c 2.0 TeV EGM W', c 2.5 TeV EGM W', c Significance (stat) Significance (stat + WZ Selection

=1 =1 =1 syst)

1 10-
1

Most significant discrepancy from background is in WZ selection at 2 TeV: 3.4 local, 2.5 global
(pp W') ½ BR(W' WZ) [fb]
104 10 10
3

0 1 2

10-1 10-2 10-3
3.5

3

10-4
4

1400 1600 1800 2000 2200 2400 2600 2800 3000 mjj [GeV]

ATLAS s = 8 TeV, 20.3 fb
-1

Observed 95% CL Expected 95% CL ‘ 1 uncertainty ‘ 2 unceirtainty

Significance

3 2 1 0 -1 -2

1.5

2

2.5

3

3.5

2

1.5

2

2.5

3

3.5

EGM W', c = 1

mjj [TeV]

10 1 10-1 1.4 2.8 3 22 mW' [TeV]

EGM W' excluded for 1.3 < mW' < 1.5 TeV

1.6

1.8

2

2.2

2.4

2.6


arXiv:1506.00962

High Mass Diboson Resonances with BosonTagged Jets
Events / 100 GeV

ATLAS 10 10 10
7

s = 8 TeV, 20.3 fb

-1

Data Background model Significance (stat) Significance (stat + syst) No boson tagging

Events / 100 GeV

10

8

104 ATLAS 10
3

s = 8 TeV, 20.3 fb-1

Data Background model Significance (stat) Significance (stat + syst) 40 < mj < 60 GeV

6

5

102 10 1 10- 10-
1

104 10
3

102

Events / 100 GeV

ATLAS 104 10 10
3

s = 8 TeV, 20.3 fb-1

Data Background model Significance (stat) Significance (stat + syst) 40 < mj1,j2 < 60 GeV 110 < mj2,j1 < 140 GeV

Events / 100 GeV

Checked for mistakes, bugs and shaping effects in ¼ Detector/data taking ¼ Jet reconstruction ¼ Event selection

10
2

Significance

4 2 0 -2

Significance

1.5

2

2.5

3

3.5

4 2 0 -2

1.5

2

2.5

3

3.5

1.5

2

2.5

3

3.5

mjj [TeV]
10
5

1.5

2

2.5

3

3.5

mjj [TeV]
104 ATLAS 10
3

s = 8 TeV, 20.3 fb-1

Data Background model Significance (stat) Significance (stat + syst) 110 < mj < 140 GeV

102 10 1 10- 10-
1

2

10 1 10- 10-
1

2

2

Significance

4 2 0 -2

Significance

1.5

2

2.5

3

3.5

4 2 0 -2

1.5

2

2.5

3

3.5

1.5

2

2.5

3

3.5

mjj [TeV]

1.5

2

2.5

3

mjj [TeV]

3.5 23


Summary
Many exotic searches have been performed on the Run-1 data with ATLAS I've presented here 7 of them, but many more can be found at ExoticsPublicResults Many limits have been placed on models With the large increase in energy for Run 2, new physics may be just around the corner!!

24


ATLAS Exotics Searches* - 95% CL Exclusion
Status: March 2015
Model
ADD GKK + g /q ADD non-resonant ADD QBH q ADD QBH ADD BH high Ntrk ADD BH high pT ADD BH high multijet RS1 GKK RS1 GKK Bulk RS GKK ZZ qq Bulk RS GKK WW qq ïï Bulk RS GKK HH bbbb Bulk RS gKK t t 2UED / RPP SSM Z SSM Z SSM W EGM W WZ EGM W WZ qq HVT W WH bb LRSM WR t b LRSM WR t b CI qqqq CI qq CI uutt EFT D5 operator (Dirac) EFT D9 operator (Dirac) Scalar LQ 1st gen Scalar LQ 2nd gen Scalar LQ 3rd gen VLQ VLQ VLQ VLQ

,
2e , ² 1 e, ²

Jets E

miss T

L dt[fb-1 ]
20.3 20.3 20.3 20.3 20.3 20.3 20.3 20.3 20.3 20.3 20.3 19.5 20.3 20.3 20.3 19.5 20.3 20.3 20.3 20.3 20.3 20.3 17.3 20.3 20.3 20.3 20.3 1.0 1.0 4.7 20.3 20.3 20.3 20.3 20.3 20.3 20.3 4.7 13.0 20.3 20.3 2.1 20.3 20.3 20.3 20.3 2.0
MD MS Mth Mth Mth Mth Mth GKK mass GKK mass GKK mass W mass GKK mass gKK mass
KK mass

Mass limit
5.25 TeV 4.7 TeV 5.2 TeV 5.82 TeV 4.7 TeV 5.8 TeV 5.8 TeV 2.68 TeV 2.66 TeV 740 GeV 700 GeV 590-710 GeV 2.2 TeV 960 GeV 2.9 TeV 2.02 TeV 3.24 TeV 1.52 TeV 1.59 TeV 1.47 TeV 1.92 TeV 1.76 TeV

L dt = (1.0 - 20.3) fb
n n n n n n n k k k k k = = = = = = = / / / / / 2 3 6 6 6 6 6

ATLAS
-1

Preliminar y

s = 7, 8 TeV

Reference
1502.01518 1407.2410 1311.2006 1407.1376

1j - 1j 2j - 2 ² (SS) - 1 e, ² 2j 2j - 2 e, ² - 2 - 2 e, ² 2j/1J 1 e, ² 2j/1J - 4b 1 e , ² 1 b, 1J/2j 2 e , ² (SS) 1 b, 1 j -
2e 2 1e 3e 2e 1e 1e 0e

Yes

- - - - - - - - - Yes - Yes Yes - - Yes Yes - Yes Yes - - - Yes
Yes Yes

HLZ

Extra dimensions

, MD = 3 TeV, non-rot BH , MD = 3 TeV, non-rot BH , MD = 3 TeV, non-rot BH

1308.4075 1405.4254 Preliminar y 1405.4123 Preliminar y 1409.6190 1503.04677 ATLAS-CONF-2014-005 ATLAS-CONF-2015-009 Preliminar y 1405.4123 1502.07177 1407.7494 1406.4456 1409.6190 Preliminar y 1410.4103 1408.0886

M M M M M

Pl Pl Pl Pl Pl

= = = = =

0 0 1 1 1

.1 .1 .0 .0 .0

BR = 0.925



,² ,² ,² ,² ,² ,² ,²

- - - - 2j/1J 2b 2 b, 0-1 j 1 b, 1 J

Z Z W W W W W W M M

Gauge bosons

mass mass


mass mass mass mass mass mass

gV = 1

2j - 2 e, ² - 2 e , ² (SS) 1 b, 1 j 0 e, ² 0 e, ² 2e 2² 1 e , ², 1 1e 2/3 2/3 1e 1e

CI

12.0 TeV 4.35 TeV




LL

21.6 TeV
|CLL | = 1

= -1

Preliminar y



LL

= -1

1407.2410 Preliminar y 1502.01518 1309.4017 1112.4828 1203.3172 1303.0526 ATLAS-CONF-2015-012 1409.5500 1409.5500 Preliminar y Preliminar y

1j 1 J, 1 j 2j 2j 1 b, 1 j 3j b b 5j 5j

DM

974 GeV 2.4 TeV 660 GeV 685 GeV 534 GeV 785 GeV 735 GeV 755 GeV 640 GeV 840 GeV 3.5 TeV 4.09 TeV 870 GeV 2.2 TeV 1.6 TeV 960 GeV 1.5 TeV 551 GeV 400 GeV 657 GeV 785 GeV 862 GeV

at 90% CL for m() < 100 GeV at 90% CL for m() < 100 GeV

- - -
Yes

LQ

LQ mass LQ mass LQ mass

=1 =1 =1
isospin singlet T in (T,B) doublet B in (B,Y) doublet isospin singlet

T5/

3

TT TT BB BB Wt

Ht Zt Zb Wt

+ X , Wb + X +X +X +X q qg Wt W , Z

Excited Excited Excited Excited Excited

quark quark quark lepton lepton

q q b

,² 1 b, e, ² 2/1 e, ² 2/1 ,² 1 b, ,² 1 b,

- - Yes Yes

T T B B T

Heavy quarks

mass mass mass mass 5/3 mass

1j - 2j - - 1 or 2 e , ² 1 b, 2 j or 1 j Yes 2 e , ², 1 - - 3 e , ², - - 1 1 e , ², 1 2 e, ² 2 e , ² (SS) 3 e , ², 1 e, ²

Excited fermions

q mass q mass b mass mass mass aT mass N0 mass H‘‘ mass H‘‘ mass
spin-1 invisible par ticle mass multi-charged par ticle mass monopole mass

only u and d , = m(q ) only u and d , = m(q ) left-handed coupling

1309.3230 1407.1376 1301.1583 1308.1364 1411.2921 1407.8150

= 2.2 TeV = 1.6 TeV

LSTC aT W LRSM Majorana Higgs triplet H ‘‘ Higgs triplet H ‘‘ Monotop (non-res prod) Multi-charged par ticles Magnetic monopoles

- -

s = 7 TeV

- 2j - - 1b - -

Yes



- - - Yes - -

m(WR ) = 2 TeV, no mixing ‘‘ DY production, BR(HL )=1 ‘‘ DY production, BR(HL )=1 anon-res = 0.2 DY production, |q | = 5e DY production, |g | = 1gD

1203.5420 1412.0237 1411.2921 1410.5404 Preliminar y 1207.6411

Other

s = 8 TeV

10

-1

1

10

Mass scale [TeV]

*Only a selection of the available mass limits on new states or phenomena is shown.

Thanks for Listening!

25


EXTRA SLIDES

26


arXiv:1506.00962

High Mass Diboson Resonances with BosonTagged Jets
Events / 100 GeV

Events / 100 GeV

104 ATLAS 10
3

104 ATLAS 10
3

s = 8 TeV, 20.3 fb

-1

102 10 1 10- 10- 10
1

Data Background model 1.5 TeV Bulk GRS, k/MPI = 1 2.0 TeV Bulk GRS, k/MPI = 1 Significance (stat) Significance (stat + syst) WW Selection

s = 8 TeV, 20.3 fb-1

102 10 1 10- 10- 10
1

Data Background model 1.5 TeV Bulk GRS, k/MPI = 1 2.0 TeV Bulk GRS, k/MPI = 1 Significance (stat) Significance (stat + syst) ZZ Selection

2

2

-3

-3

Significance

3 2 1 0 -1 -2

1.5

2

2.5

3

3.5

Significance

3 2 1 0 -1 -2

1.5

2

2.5

3

3.5

1.5

2

2.5

3

3.5

1.5

2

2.5

3

3.5

mjj [TeV]

mjj [TeV]

27


arXiv:1506.00962

High Mass Diboson Resonances with BosonTagged Jets

WW) [fb]

ZZ) [fb]

104 10
3

ATLAS s = 8 TeV, 20.3 fb
-1

Observed 95% CL Expected 95% CL ‘ 1 uncertainty ‘ 2 uncertainty

104 10
3

ATLAS s = 8 TeV, 20.3 fb
-1

Observed 95% CL Expected 95% CL ‘ 1 uncertainty ‘ 2 uncertainty

RS

(pp G ) ½ BR(G

(pp G ) ½ BR(G

RS

102 10 1 10-1

Bulk GRS k/ MPI = 1

102 10 1 10-1 1.4

Bulk GRS k/ MPI = 1

RS

1.4

1.6

1.8

2

2.2

2.4

2.6

2.8 3 mG [TeV]
RS

RS

1.6

1.8

2

2.2

2.4

2.6

2.8 3 mG [TeV]
RS

28


arXiv:1506.00962

High Mass Diboson Resonances with BosonTagged Jets

Parametric fit to background:

dn = p1 (1 - x ) dx

p2 - p3

x

p3

Where: ¼ X = mJJ/s ¼ p1 is a normalisation factor ¼ p2 and p3 are dimensionless shape parameters ¼ is a dimensionless constant chosen after the fitting to minimize the correlations between p1 and p2
29


arXiv:1506.00962

High Mass Diboson Resonances with BosonTagged Jets Cross Checks
Events / 100 GeV
107 10 10 10 10 10
6 5 4 3 2

ATLAS
s = 8 TeV, 20.3 fb
-1

Data Background model 2.0 TeV EGM W', c = 1 Significance (stat + syst) only jet ungroomed n
trk

Events / 100 GeV

10

8

10

8

107 10 10 10 10 10
6 5 4 3 2

ATLAS
s = 8 TeV, 20.3 fb-1

Data Background model 2.0 TeV EGM W', c = 1 Significance (stat + syst) only jet y
f

Significance

Significance

Checked for mistakes, bugs and shaping effects in ¼ Detector/data taking ¼ Jet reconstruction ¼ Event selection e.g. ¼ look at the effect of single cuts on the distribution ¼ Look at the effect of N-1 cuts on the distribution

10 1 10- 10
1

10 1 10-
1

-2

3 2 1 0 -1 -2

1.5

2

2.5

3

3.5

10

-2

1.5

2

2.5

3

3.5

3 2 1 0 -1 -2

1.5

2

2.5

3

3.5

mjj [TeV]
Events / 100 GeV
10
8

1.5

2

2.5

3

3.5

mjj [TeV]

107 10 10 10 10 10
6 5 4 3 2

ATLAS
s = 8 TeV, 20.3 fb-1

Data Background model 2.0 TeV EGM W', c = 1 Significance (stat + syst) only m
j

10 1 10
-1

10-2 3 2 1 0 -1 -2

Significance

1.5

2

2.5

3

3.5

1.5

2

2.5

3

3.5

mjj [TeV]

30


arXiv:1506.00962

High Mass Diboson Resonances with BosonTagged Jets Cross Checks
Events / 100 GeV
107 10 10 10 10 10
6 5 4 3 2

ATLAS
s = 8 TeV, 20.3 fb
-1

Data Background model 2.0 TeV EGM W', c = 1 Significance (stat + syst) w/o mj

Events / 100 GeV

10

8

10

8

107 10 10 10 10 10
6 5 4 3 2

ATLAS
s = 8 TeV, 20.3 fb-1

Data Background model 2.0 TeV EGM W', c = 1 Significance (stat + syst) w/o jet y
f

Significance

Significance

Checked for mistakes, bugs and shaping effects in ¼ Detector/data taking ¼ Jet reconstruction ¼ Event selection e.g. ¼ look at the effect of single cuts on the distribution ¼ Look at the effect of N-1 cuts on the distribution

10 1 10- 10
1

10 1 10-
1

-2

3 2 1 0 -1 -2

1.5

2

2.5

3

3.5

10

-2

1.5

2

2.5

3

3.5

3 2 1 0 -1 -2

1.5

2

2.5

3

3.5

mjj [TeV]
Events / 100 GeV Events / 100 GeV
10
8

1.5

2

2.5

3

3.5

mjj [TeV]
10
8

107 10 10 10 10 10
6 5 4 3 2

ATLAS
s = 8 TeV, 20.3 fb-1

Data Background model 2.0 TeV EGM W', c = 1 Significance (stat + syst) w/o jet ungroomed n
trk

107 10 10 10 10 10
6 5 4 3 2

ATLAS
s = 8 TeV, 20.3 fb-1

Data Background model 2.0 TeV EGM W', c = 1 Significance (stat + syst) WZ Selection

10 1 10
-1

10 1 10
-1

10-2 3 2 1 0 -1 -2

Significance

Significance

1.5

2

2.5

3

3.5

10-2 3 2 1 0 -1 -2

1.5

2

2.5

3

3.5

1.5

2

2.5

3

3.5

1.5

2

2.5

3

mjj [TeV]

mjj [TeV]

3.5 31


arXiv:1506.00962

High Mass Diboson Resonances with BosonTagged Jets í Similar Analyses
ATLAS resolved dijet search arXiv:1407.1376
Prescale-weighted events
10 10 10 10 10 10 10 10
9 8 7 6 5 4 3 2

ATLAS semileptonic search W(l)Z(jj) arXiv:1503.04677
Events / 100 GeV
ATLAS 103 102 10 1 10-1 s = 8 TeV, Ldt = 20.3 fb W l + 1 large-R jet

ATLAS
s=8 TeV, L dt=20.3 fb



-1



-1

Data W/Z+jets tt+single top Multijet Diboson Uncertainty G*(1200 GeV) W'(1200 GeV)

10
[data-fit]/fit

Data Fit q*, m = 0.6 TeV q*, m = 2.0 TeV q*, m = 3.5 TeV

1
1 0

2 0 -2

Data / Bkg

-1

0.3

0.4 0.5

1

2

3

4

5

2 1.5 1 0.5 0

Signif.

800 1000 1200 1400 1600 1800 2000 2200 2400

Reconstructed mjj [TeV]

mlvJ [GeV]

32


arXiv:1506.00962

High Mass Diboson Resonances with BosonTagged Jets í Similar Analyses
ATLAS semileptonic search W(jj)Z(ll) arXiv:1409.6190
Events / GeV

CMS dijet search arXiv:1501.04198 Phys. Rev. D 91, 052009 (2015)
d/dmjj (pb/GeV)
10 1 10-1 10
-2

103 102 10 1 10-1 10 10
-2 -3

19.7 fb-1 (8 TeV)

24.32 / 35
2 Prob p0

/ ndf 0.912 1.375e-08 ‘ 4.954e-10 2.466 ‘ 0.1057 8.023 ‘ 0.01738 0.4947 ‘ 0.006963

ATLAS s = 8 TeV L dt = 20.3 fb-1 High-p Res. Region T Z ee, ²² Channel

Data Z+jets ZZ/ZW/WW tt+Single Top Sys+Stat Uncertainty G*, m=800 GeV Nominal ½ 10.0

p1 p2 p3

CMS
Fit

2 b tags Data

10-3 10-4 10-5 10
-6

Wide jets (R = 1.1) || < 2.5 & |jj| < 1.3

b* (1.8 TeV)

Z' (2.2 TeV)

10-4

10-7 10-8
Residuals
2 0 -2

G (2.8 TeV) Z' (3.2 TeV)

1.4 1.2 1 0.8 0.6 0

Data / BG

10001500 200025003000 35004000 450050005500

Dijet mass (GeV)
1000 2000 3000 4000 5000

500

1000

1500

2000 2500 mlljj [GeV]

Dijet mass (GeV)

Tiny blip at 2 TeV in 2 b-tag channel
33


arXiv:1506.00962

High Mass Diboson Resonances with BosonTagged Jets í Similar Analyses
CMS right-handed boson search arXiv:1407.3683 Eur. Phys. J. C 74 (2014) 3149
19.7 fb-1 (8 TeV)

CMS semileptonic WW WZ ZZ search arXiv:1405.3447 JHEP 08 (2014) 174
CMS L = 19.7 fb-1 at s = 8 TeV
CMS Data (ee HP) Background estimation Z+jets Other Backgrounds (tt, VV)

Events / 0.2 TeV

103 10
2

CMS

Data (1717) tt (1147) DY+Jets (475) Other (151) MWR = 2.5 TeV (29) MWR = 2.5 TeV unbinned MN = MWR/2

10

1

Gbulk MG = 1 TeV, k /M Pl = 0.5 (x100)

10 1 10-1 40

Events / GeV
All Systematic Uncertainties No Shape Uncertainty

10-1

10-2

Data/SM

1

2

3

4

10

-3

2 0 1 2 3 4 Meejj [TeV]
500 1000 1500 2000 2500

mZZ [GeV]

Excess at 2 TeV only seen in eejj channel

34


arXiv:1506.00962

High Mass Diboson Resonances with BosonTagged Jets í Similar Analyses
CMS fully hadronic WW WZ ZZ search arXiv:1405.1994 JHEP 08 (2014) 173

d/dm (pb/TeV)

CMS, L = 19.7 fb-1, s = 8 TeV
102 10 1 10-1 10-2 10-3 Low-purity doubly W/Z-tagged data Fit GRS WW (1.5 TeV)

Data-Fit Data

2 0 -2

½10

3

1

1.5

2

2.5

3

Broad blip at 2 TeV

mjj (TeV)

35