Prospects for BSM searches at the HL-‐LHC with the ATLAS detector

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Prospects for BSM searches at the HL-‐LHC with the ATLAS detector

Frederik Rühr (Freiburg)

on behalf of the

ATLAS Collaboration

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Overview

•  Introduction

•  Higgs couplings and new phenomena

•  WIMP dark matter searches

•  SUSY prospects

•  New resonant phenomena

•  Summary

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IntroducFon

•  LHC Run 2: ~100fb-1 at √s = 13-14 TeV

•  Run 3: ~300fb-1 at √s = 14 TeV,

<mu> ~ 60

•  High Luminosity LHC (HL-LHC) at up to 5 x 10³⁴cm^-2s^-1, <mu> ~ 140

•  Focus of this talk: Late Run 3 and HL-LHC

•  Best scenario: Rich program of

measurements following Beyond the

Standard Model (BSM) discovery during LHC Run 2 – not predictable

•  Reporting expected sensitivity to broad range of BSM benchmark models in direct searches

•  Higgs precision measurements will provide vital information, but will not close the topic

hHp://arxiv.org/abs/1206.3560

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Two Higgs Doublets (e.g. MSSM)

Indirect constraints to new physics

•  Expected constraints on new physics from combination of Higgs couplings

•  Including majority of final states but excluding H->bb

•  b-jet performance in high pileup crucial – more refined studies needed

•  Several scenarios studied, e.g.:

•  extension of Higgs sector

with additional doublet (concrete example: MSSM)

•  Dark Matter (DM) in Higgs portal model

ATL-‐PHYS-‐PUB-‐2013-‐015

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Direct WIMP producFon

•  Complementary to non-collider DM searches, unique access to low DM masses

•  Pair production of WIMPs

•  Events characterized by Initial State Radiation (ISR) + Missing Transverse Energy (MET)

•  Prevalent model in 7/8 TeV LHC searches:

effective field theory incl. 4-point interaction

•  Use limited by validity towards high momentum transfers – more severe at 14 TeV

•  Limits using simplified models with light mediators for

comparison

•  Sensitivity expected to increase by up to a factor of ~3 compared to current results

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•  Discovery (or exclusion) of weak-scale SUSY one of the highest priorities at current and future LHC

•  Large range of scenarios studied for HL-LHC: direct production of …

•  light flavour and third generation squarks

•  gluinos

•  neutralino+chargino decaying to gauge bosons or Higgs

•  Analyses re-optimized for expected statistics and physics performance

•  Simplified models to assess sensitivity

•  actual future results will feature wider range of scenarios

SUSY prospects

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•  Signal regions

•  0(1) lepton

•  >5(3) jets

•  2(1) of them b-tagged

•  High MET

•  No lepton

•  Exactly 2 jets with pT > 50 GeV, both b-tagged

•  High MET

•  In both cases 100% branching ratio (BR) to quark+neutralino assumed

•  Significant reach towards high squark masses in Run 3, good improvements by HL-LHC

SUSY – stop and sboHom

stop sboHom ATLAS-‐PHYS-‐PUB-‐2013-‐011 ATL-‐PHYS-‐PUB-‐2014-‐010

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Strong inclusive SUSY searches

•  Nine signal regions for light flavor squarks and gluinos

•  >=2 to >=6 jets

•  0 leptons

•  Selection based on 8 TeV publication*, optimizations for Run-3 HL-LHC using effective mass and MET significance

•  (large uncertainty in high mass gluino case is from PDF uncertainties and not signal specific)

* hHp://arxiv.org/abs/1405.7875

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EWK SUSY producFon

•  Direct production of wino-like chargino and neutralino, decaying to lightest neutralino and W/Z/h

•  All sleptons and sneutrinos assumed to be heavy

•  Final states

•  3 leptons + large MET

•  1 lepton + 2 taus + large MET

•  Very significant increase of mass reach from Run-3 to HL-LHC expectation

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High-‐mass resonances

•  New resonant phenomena in ttbar (lepton+jets and dilepton channel) as well as direct dilepton final states

•  Benchmark models: Kaluza-Klein gluons and Z’

•  Use of signal templates

•  Significant increase in sensitivity expected for Run-3 and HL-LHC, especially in ttbar channel

•  Exclusion reach, in TeV, for ttbar ->

lepton+jets (dilepton):

ATLAS-‐PHYS-‐PUB-‐2013-‐003

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Summary

•  Higgs discovery completes the Standard Model

•  But Standard Model not final answer = low-energy effective theory?

•  Highest priorities of current and future LHC

•  Searching for BSM phenomena and/or deviations in Higgs couplings from SM

•  LHC Run 3 and HL-LHC potential very promising

•  Typically simple extrapolations to estimate sensitivities, significant optimizations and improvements in techniques expected

•  E.g. Higgs discovery was made at half LHC design energy AND less statistics than initially thought required

•  Benchmark models indicate very significant increases of reach for

•  WIMP dark matter

•  Supersymmetry

•  New resonant di-top or di-lepton phenomena

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Backup

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Status with current data

Model e, µ,τ,γ _Jets E^miss

T

!Ldt[fb⁻¹] Mass limit Reference

InclusiveSearches3rdgen. ˜gmed.3rdgen.squarks directproductionEW directLong-lived particlesRPVher

MSUGRA/CMSSM 0 2-6 jets Yes 20.3 q,˜˜g 1.7 TeV ^m(˜^q)=m(˜^g) 1405.7875

MSUGRA/CMSSM 1e, µ 3-6 jets Yes 20.3 g˜ 1.2 TeV any m(q)˜ ATLAS-CONF-2013-062

MSUGRA/CMSSM 0 7-10 jets Yes 20.3 ^g^˜ 1.1 TeV any m(q)˜ 1308.1841

˜

qq,˜q→q˜ χ˜⁰₁ 0 2-6 jets Yes 20.3 q˜ 850 GeV m(χ˜⁰₁)=0 GeV, m(1^stgen.˜q)=m(2^ndgen.˜q) 1405.7875

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gg,˜g˜→q¯qχ˜⁰₁ 0 2-6 jets Yes 20.3 g˜ 1.33 TeV m(˜χ⁰₁)=0 GeV 1405.7875

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gg,˜g→qq˜ χ˜^±₁→qqW^±χ˜⁰₁ 1e, µ 3-6 jets Yes 20.3 g˜ 1.18 TeV m(χ˜⁰₁)<200 GeV, m(χ˜^±)=0.5(m(χ˜⁰₁)+m(˜g)) ATLAS-CONF-2013-062

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gg,˜g˜→qq(""/"ν/νν) ˜χ⁰₁ 2e, µ 0-3 jets - 20.3 g˜ 1.12 TeV m(˜χ⁰₁)=0 GeV ATLAS-CONF-2013-089

GMSB ("˜NLSP) 2e, µ 2-4 jets Yes 4.7 ^g^˜ 1.24 TeV ^tanβ<15 1208.4688

GMSB ("˜NLSP) 1-2τ+ 0-1" 0-2 jets Yes 20.3 g˜ 1.6 TeV ^tanβ^>20 1407.0603

GGM (bino NLSP) 2γ - Yes 20.3 g˜ 1.28 TeV m(˜χ⁰₁)>50 GeV ATLAS-CONF-2014-001

GGM (wino NLSP) 1e, µ+γ - Yes 4.8 g˜ 619 GeV m(χ˜⁰₁)>50 GeV ATLAS-CONF-2012-144

GGM (higgsino-bino NLSP) γ 1b Yes 4.8 g˜ 900 GeV m(˜χ⁰₁)>220 GeV 1211.1167

GGM (higgsino NLSP) 2e, µ(Z) 0-3 jets Yes 5.8 ^g^˜ 690 GeV m(NLSP)>200 GeV ATLAS-CONF-2012-152

Gravitino LSP 0 mono-jet Yes 10.5 F^1/2scale 645 GeV m(G)>10˜ ⁻⁴eV ATLAS-CONF-2012-147

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g→bb¯χ˜⁰₁ 0 3b Yes 20.1 ^g^˜ 1.25 TeV m(χ˜⁰₁)<400 GeV 1407.0600

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g→tt¯χ˜⁰₁ 0 7-10 jets Yes 20.3 g˜ 1.1 TeV m(˜χ⁰₁)<350 GeV 1308.1841

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g→tt¯χ˜⁰₁ 0-1e, µ 3b Yes 20.1 g˜ 1.34 TeV m(˜χ⁰₁)<400 GeV 1407.0600

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g→b¯tχ˜⁺₁ 0-1e, µ 3b Yes 20.1 g˜ 1.3 TeV m(χ˜⁰₁)<300 GeV 1407.0600

b˜1˜b1,˜b1→bχ˜⁰₁ 0 2b Yes 20.1 ^˜b1 100-620 GeV m(˜χ⁰₁)<90 GeV 1308.2631

b˜1˜b1,˜b1→t˜χ^±₁ 2e, µ(SS) 0-3b Yes 20.3 ^˜b1 275-440 GeV m(χ˜^±₁)=2 m(χ˜⁰₁) 1404.2500

t˜1˜t1(light),t˜1→bχ˜^±₁ 1-2e, µ 1-2b Yes 4.7 ^˜t1 110-167 GeV m(˜χ⁰₁)=55 GeV 1208.4305, 1209.2102

t˜1˜t1(light),t˜1→Wbχ˜⁰₁ 2e, µ 0-2 jets Yes 20.3 ^˜t1 130-210 GeV m(χ˜⁰₁) =m(˜t1)-m(W)-50 GeV, m(˜t1)<<m(χ˜^±₁) 1403.4853

t˜1˜t1(medium),t˜1→tχ˜⁰₁ 2e, µ 2 jets Yes 20.3 ^˜t1 215-530 GeV m(˜χ⁰₁)=1 GeV 1403.4853

t˜1˜t1(medium),t˜1→bχ˜^±₁ 0 2b Yes 20.1 ˜t1 150-580 GeV m(χ˜⁰₁)<200 GeV, m(χ˜^±₁)-m(χ˜⁰₁)=5 GeV 1308.2631

t˜1˜t1(heavy),˜t1→tχ˜⁰₁ 1e, µ 1b Yes 20 ^˜t1 210-640 GeV m(χ˜⁰₁)=0 GeV 1407.0583

t˜1˜t1(heavy),˜t1→tχ˜⁰₁ 0 2b Yes 20.1 ˜t1 260-640 GeV m(˜χ⁰₁)=0 GeV 1406.1122

t˜1˜t1,˜t1→cχ˜⁰₁ 0 mono-jet/c-tag Yes 20.3 ^˜t1 90-240 GeV m(˜t1)-m(χ˜⁰₁)<85 GeV 1407.0608

t˜1˜t1(natural GMSB) 2e, µ(Z) 1b Yes 20.3 ^˜t1 150-580 GeV m(˜χ⁰₁)>150 GeV 1403.5222

t˜2˜t2,˜t2→˜t1+Z 3e, µ(Z) 1b Yes 20.3 ^˜t2 290-600 GeV m(˜χ⁰₁)<200 GeV 1403.5222

"˜L,R"˜L,R,"→"˜ χ˜⁰₁ 2e, µ 0 Yes 20.3 #˜ 90-325 GeV m(˜χ⁰₁)=0 GeV 1403.5294

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χ⁺₁χ˜⁻₁,χ˜⁺₁→"ν("˜˜ ν) 2e, µ 0 Yes 20.3 ^χ^˜^±₁ 140-465 GeV m(˜χ⁰₁)=0 GeV, m(˜",ν)=0.5(m(˜˜ χ^±₁)+m(χ˜⁰₁)) 1403.5294

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χ⁺₁χ˜⁻₁,χ˜⁺₁→τν(τ˜˜ ν) 2τ - Yes 20.3 ^χ^˜^±1 100-350 GeV m(χ˜⁰₁)=0 GeV, m(˜τ,ν)=0.5(m(˜ χ˜^±₁)+m(χ˜⁰₁)) 1407.0350

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χ^±₁χ˜⁰₂→"˜Lν"˜L"(˜νν),"˜ν"˜L"(˜νν) 3e, µ 0 Yes 20.3 χ^˜^±₁,χ˜⁰₂ 700 GeV m(˜χ^±₁)=m(χ˜⁰₂), m(χ˜⁰₁)=0, m(˜",ν)=0.5(m(˜˜ χ^±₁)+m(˜χ⁰₁)) 1402.7029

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χ^±₁χ˜⁰₂→Wχ˜⁰₁Zχ˜⁰₁ 2-3e, µ 0 Yes 20.3 ^χ^˜^±1,χ˜⁰₂ 420 GeV m(χ˜^±₁)=m(χ˜⁰₂), m(χ˜⁰₁)=0, sleptons decoupled 1403.5294, 1402.7029

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χ^±₁χ˜⁰₂→Wχ˜⁰₁hχ˜⁰₁ 1e, µ 2b Yes 20.3 ^χ^˜^±₁,χ˜⁰ 285 GeV m(˜χ^±₁)=m(χ˜⁰₂), m(χ˜⁰₁)=0, sleptons decoupled ATLAS-CONF-2013-093

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χ⁰₂χ˜⁰₃,χ˜⁰_2,3→˜"R" 4e, µ 0 Yes 20.3 ^χ^˜⁰_2,3 620 GeV m(˜χ⁰₂)=m(χ˜⁰₃), m(˜χ⁰₁)=0, m(˜",˜ν)=0.5(m(χ˜⁰₂)+m(χ˜⁰₁)) 1405.5086

Directχ˜⁺₁χ˜⁻₁prod., long-livedχ˜^±₁ Disapp. trk 1 jet Yes 20.3 ^χ^˜^±₁ 270 GeV m(˜χ^±₁)-m(χ˜⁰₁)=160 MeV,τ( ˜χ^±₁)=0.2 ns ATLAS-CONF-2013-069

Stable, stoppedg˜R-hadron 0 1-5 jets Yes 27.9 g˜ 832 GeV m(˜χ⁰₁)=100 GeV, 10µs<τ(˜g)<1000 s 1310.6584

GMSB, stable˜τ,χ˜⁰₁→˜τ(˜e,µ)+τ(e, µ)˜ 1-2µ - - 15.9 ^χ^˜⁰₁ 475 GeV 10<tanβ<50 ATLAS-CONF-2013-058

GMSB,χ˜⁰₁→γG, long-lived˜ χ˜⁰₁ 2γ - Yes 4.7 χ^˜⁰₁ 230 GeV 0.4<τ( ˜χ⁰₁)<2 ns 1304.6310

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qq,˜χ˜⁰₁→qqµ(RPV) 1µ, displ. vtx - - 20.3 ^q^˜ 1.0 TeV 1.5<cτ<156 mm, BR(µ)=1, m(χ˜⁰₁)=108 GeV ATLAS-CONF-2013-092

LFVpp→ν˜τ+X,˜ντ→e+µ 2e, µ - - 4.6 ν˜τ 1.61 TeV λ^#₃₁₁=0.10,λ132=0.05 1212.1272

LFVpp→˜ντ+X,˜ντ→e(µ)+τ 1e, µ+τ - - 4.6 ^ν^˜τ 1.1 TeV λ^#₃₁₁=0.10,λ1(2)33=0.05 1212.1272

Bilinear RPV CMSSM 2e, µ(SS) 0-3b Yes 20.3 q,˜˜g 1.35 TeV m(˜q)=m(˜g),cτLS P<1 mm 1404.2500

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χ⁺₁χ˜⁻₁,χ˜⁺₁→Wχ˜⁰₁,χ˜⁰₁→ee˜νµ,eµ˜νe 4e, µ - Yes 20.3 ^χ^˜^±₁ 750 GeV m(˜χ⁰₁)>0.2×m(˜χ^±₁),λ121!0 1405.5086

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χ⁺₁χ˜⁻₁,χ˜⁺₁→Wχ˜⁰₁,χ˜⁰₁→ττ˜νe,eτ˜ντ 3e, µ+τ - Yes 20.3 ^χ^˜^±1 450 GeV m(χ˜⁰₁)>0.2×m(χ˜^±₁),λ133!0 1405.5086

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g→qqq 0 6-7 jets - 20.3 g˜ 916 GeV BR(t)=BR(b)=BR(c)=0% ATLAS-CONF-2013-091

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g→t˜1t,t˜1→bs 2e, µ(SS) 0-3b Yes 20.3 ^g^˜ 850 GeV 1404.250

Scalar gluon pair, sgluon→q¯q 0 4 jets - 4.6 sgluon 100-287 GeV incl. limit from 1110.2693 1210.4826

Scalar gluon pair, sgluon→t¯t 2e, µ(SS) 2b Yes 14.3 ^sgluon 350-800 GeV ATLAS-CONF-2013-051

ATLAS SUSY Searches* - 95% CL Lower Limits

Status: ICHEP 2014

ATLAS Preliminary

√s= 7, 8 TeV

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Status with current data

Model !,γ Jets E^miss_T ^!Ldt[fb⁻¹] Mass limit Reference

ExtradimensionsGaugebosonsCIDMLQHeavy quarksExcited fermionsOther

ADDGKK+g/q − 1-2 j Yes 4.7 MD 4.37 TeV n= 2 1210.4491

ADD non-resonant!! 2e,µ − − 20.3 ^MS 5.2 TeV n= 3HLZ ATLAS-CONF-2014-030

ADD QBH→!q 1e,µ 1 j − 20.3 ^Mth 5.2 TeV n= 6 1311.2006

ADD QBH − 2 j − 20.3 Mth 5.82 TeV n= 6 to be submitted to PRD

ADD BH highNtrk 2µ(SS) − − 20.3 Mth 5.7 TeV n= 6,MD= 1.5TeV, non-rot BH 1308.4075

ADD BH high!

pT ≥1e,µ ≥2j − 20.3 ^Mth 6.2 TeV ⁿ^{= 6,}^MD= 1.5TeV, non-rot BH 1405.4254

RS1GKK→!! 2e,µ − − 20.3 ^GKKmass 2.68 TeV k/MPl= 0.1 1405.4123

RS1G_KK→WW→!ν!ν 2e,µ − Yes 4.7 GKKmass 1.23 TeV k/MPl= 0.1 1208.2880

Bulk RSGKK→ZZ→!!qq 2e,µ 2 j / 1 J − 20.3 ^GKKmass 730 GeV k/MPl= 1.0 ATLAS-CONF-2014-039

Bulk RSGKK→HH→b¯bb¯b − 4 b − 19.5 ^GKKmass 590-710 GeV k/MPl= 1.0 ATLAS-CONF-2014-005

Bulk RSgKK→tt 1e,µ ≥1b,≥1J/2j Yes 14.3 ^gKKmass 2.0 TeV ^{BR = 0.925} ATLAS-CONF-2013-052

S¹/Z2ED 2e,µ − − 5.0 MKK≈R⁻¹ 4.71 TeV 1209.2535

UED 2γ − Yes 4.8 Compact. scaleR⁻¹ 1.41 TeV ATLAS-CONF-2012-072

SSMZ^$→!! 2e,µ − − 20.3 Z^#mass 2.9 TeV 1405.4123

SSMZ^$→ττ 2τ − − 19.5 Z^#mass 1.9 TeV ATLAS-CONF-2013-066

SSMW^$→!ν 1e,µ − Yes 20.3 W^#mass 3.28 TeV ATLAS-CONF-2014-017

EGMW^$→WZ→!ν !^$!^$ 3e,µ − Yes 20.3 W^#mass 1.52 TeV ^1406.4456

EGMW^$→WZ→qq!! 2e,µ 2 j / 1 J − 20.3 W^#mass 1.59 TeV ATLAS-CONF-2014-039

LRSMW_R^$→tb 1e,µ 2 b, 0-1 j Yes 14.3 W^#mass 1.84 TeV ATLAS-CONF-2013-050

LRSMW_R^$→tb 0e,µ ≥1b, 1 J − 20.3 W^#mass 1.77 TeV to be submitted to EPJC

CIqqqq − 2 j − 4.8 Λ 7.6 TeV η= +1 1210.1718

CIqq!! 2e,µ − − 20.3 Λ 21.6 TeV ηLL=−1 ATLAS-CONF-2014-030

CIuutt 2e,µ(SS)≥1b,≥1j Yes 14.3 Λ 3.3 TeV |C|= 1 ATLAS-CONF-2013-051

EFT D5 operator (Dirac) 0e,µ 1-2 j Yes 10.5 M∗ 731 GeV at 90% CL form(χ)<80GeV ATLAS-CONF-2012-147

EFT D9 operator (Dirac) 0e,µ 1 J,≤1j Yes 20.3 ^M∗ 2.4 TeV at 90% CL form(χ)<100GeV 1309.4017

Scalar LQ 1^stgen 2e ≥2j − 1.0 LQ mass 660 GeV ^β^{= 1} 1112.4828

Scalar LQ 2^ndgen 2µ ≥2j − 1.0 ^{LQ mass} 685 GeV β= 1 1203.3172

Scalar LQ 3^rdgen 1e,µ, 1τ 1 b, 1 j − 4.7 ^{LQ mass} 534 GeV ^β^{= 1} ^1303.0526

Vector-like quarkTT→Ht+X 1e,µ ≥2b,≥4j Yes 14.3 Tmass 790 GeV T in (T,B) doublet ATLAS-CONF-2013-018

Vector-like quarkTT→Wb+X 1e,µ ≥1b,≥3j Yes 14.3 Tmass 670 GeV isospin singlet ATLAS-CONF-2013-060

Vector-like quarkTT→Zt+X 2/≥3e,µ ≥2/≥1 b − 20.3 Tmass 735 GeV T in (T,B) doublet ATLAS-CONF-2014-036

Vector-like quarkBB→Zb+X 2/≥3e,µ ≥2/≥1 b − 20.3 Bmass 755 GeV B in (B,Y) doublet ATLAS-CONF-2014-036

Vector-like quarkBB→Wt+X 2e,µ(SS) ≥1b,≥1j Yes 14.3 Bmass 720 GeV B in (T,B) doublet ATLAS-CONF-2013-051

Excited quarkq^∗→qγ 1γ 1 j − 20.3 ^q^∗^mass 3.5 TeV ônlyû^∗ând^d^∗^,^Λ⁼^m(q^∗⁾ ^1309.3230

Excited quarkq^∗→qg − 2 j − 20.3 q^∗mass 4.09 TeV ^onlyu^∗andd^∗,Λ=m(q^∗) to be submitted to PRD

Excited quarkb^∗→Wt 1 or 2e,µ1 b, 2 j or 1 j Yes 4.7 b^∗mass 870 GeV left-handed coupling 1301.1583

Excited lepton!^∗→!γ 2e,µ, 1γ − − 13.0 !^∗mass 2.2 TeV Λ= 2.2TeV 1308.1364

LSTCaT→Wγ 1e,µ, 1γ − Yes 20.3 ^aTmass 960 GeV to be submitted to PLB

LRSM Majoranaν 2e,µ 2 j − 2.1 N⁰mass 1.5 TeV m(WR) = 2TeV, no mixing 1203.5420

Type III Seesaw 2e,µ − − 5.8 N^±mass 245 GeV |Ve|=0.055,|Vµ|=0.063,|Vτ|=0 ATLAS-CONF-2013-019

Higgs tripletH^±±→!! 2e,µ(SS) − − 4.7 H^±±mass 409 GeV DY production, BR(H^±±→!!)=1 1210.5070

Multi-charged particles − − − 4.4 multi-charged particle mass 490 GeV DY production,|q|= 4e 1301.5272

Magnetic monopoles − − − 2.0 monopole mass 862 GeV DY production,|g|= 1gD 1207.6411

√ √

ATLAS Exotics Searches* - 95% CL Exclusion

Status: ICHEP 2014

ATLAS Preliminary

"

Ldt= (1.0 - 20.3) fb⁻¹ √

s= 7, 8 TeV

Prospects for BSM searches at the HL-­‐LHC with the ATLAS detector