Hints from Run 1 and Prospects from Run 2 at ATLAS

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1 Hints from Run 1 and Prospects from Run 2 at ATLAS Catrin Bernius New York University on behalf of the ATLAS Collaboration PPC 2015 Deadwood, SD, 2. July

2 Outline LHC and Run 1 data-taking Physics results Standard Model & Top physics Search that became a measurement: the Higgs Boson SUSY & Exotics Prospects from Run 2 Detector upgrades & Commissioning SUSY prospects Not possible to present everything in this talk: B-physics Heavy Ions results And many interesting results and details Deliberately not covering Dark Matter results from ATLAS (dedicated talk by Sascha Mehlhase this morning) Catrin Bernius, NYU 2

3 LHC Catrin Bernius, NYU LINAC PSB PS SPS LHC 3

4 The ATLAS Experiment ATLAS Collaboration: 38 countries, 177 institutes 3000 scientific authors Catrin Bernius, NYU 4

5 Hints from Run 1 The LHC Run 1 & the ATLAS Experiment Summary of Standard Model, Top, Higgs, SUSY and exotic analyses 5

6 The LHC Run 1 Successful LHC Run 1 collecting pp data with the ATLAS experiment under challenging conditions: s [TeV] Peak luminosity [cm -2 s -1 ] 2.1 x x x Trigger challenge: how to select 400 out of 20M events per second while keeping the interesting physics, including the unknown inclusive unprescaled trigger thresholds within 5 GeV throughout the large luminosity increase Computing challenge: Reconstruct, store and distribute 400 complex events per second (reached 120 PB of data and simulation) Data taking efficiency for 2012 (2011) was ~93.1% (93 %), data quality selection ~95.8% (90 %) Very successful and efficient Run 1 for ATLAS Catrin Bernius, NYU 6

7 ATLAS Trigger The ATLAS trigger system is a 3-tiered system: The ATLAS trigger system is based on two main levels: L1 and High Level Trigger (HLT), which is subdivided in L2 and Event Filter L1 is hardware-based, designed to reduce the rate from 40 MHz to 75kHz HLT is software-based, the event rate is further reduced to on average ~ 400Hz The trigger menu is designed for a given target luminosity, prescales sets corresponding to various luminosity steps adjust the rates at which the various triggers accept events throughout the run when the luminosity decreases Catrin Bernius, NYU 7

8 Summary of ATLAS SM results Summary of several SM total production cross section measurements: Good agreement with SM expectations within uncertainties Experimental uncertainties are in some cases at the level of the theoretical predictions, in some even better; in fact, sensitive to QCD in a few processes effects beyond NLO. Preliminary measurements of the cross-sections down to few pb (~ tens of fb in some cases if BR is included) First evidence of electroweak W ± W ± jj production: W ± W ± jj and electroweak-only W ± W ± jj production observed with a significance of 4.5 and 3.6 standard deviations respectively Measured production cross sections are in agreement with Standard Model predictions Limits at 95% confidence level are set on anomalous quartic gauge couplings CombinedSummaryPlots/SM/ arxiv: Catrin Bernius, NYU 8

9 Top Production & Mass Measurement Top-pair production cross-section at 8 TeV: compared to exact NNLO QCD calculation complemented with NNLL resumption theory band represents uncertainties due to renormalisation and factorisation scale, parton density functions and strong couplings arxiv: Precision mass measurement using 3D fit to reduce effect of Jet Energy Scale (JES) and bjes on the final measurement; Combination of lepton + jets and dilepton channels gives a measured top = ±0.48(stat) ±0.78(syst) GeV with a total uncertainty of 0.91 GeV Catrin Bernius, NYU 9

10 Higgs: The Search that Became a Measurement Since the discovery of the Higgs boson, an entire new field has emerged The Higgs boson observed is to a good precision compatible with the SM Higgs boson: direct evidence of coupling to W and Z direct evidence of coupling to taus (and therefore to fermions) direct evidence for non-universal couplings evidence for VBF production indirect evidence of coupling to top quarks evidence of the scalar nature Establishing the properties of the Higgs boson has been possible and will continue to be through collaboration with the theory community Two key SM Higgs measurements submitted since Nov 14: H WW*: 6.1σ observed (5.8 exp) (arxiv: ) H ττ: 4.5σ observed (3.4 exp) (arxiv: ) The best fit of the signal strength is compatible with the SM μ =0 no Higgs μ =1 SM Higgs Catrin Bernius, NYU 10

11 Higgs: Invariant Mass Distributions Invariant mass distribution of four-leptons for the selected candidates, compared to the background expectation in the GeV mass range for the combination of s = 7 and 8 TeV data di-photon candidates after all section for the combined 7 and 8 TeV data sample (a/c) inclusive sample & weighted version (b/d) residuals of the data/weighted data wrt respective fitted background component Phys. Lett. B 716 (2012) 1-29 Catrin Bernius, NYU 11

12 SUSY & Beyond the Standard Model Dominant SUSY particle production modes at the LHC squark-gluino, squark-squark, gluino-gluino Decay in cascades to Lightest SUSY Particles (LSP) Assume R-Parity conservation The LSP is stable and escapes the detector unseen Final states: Final states with jets and missing transverse momentum (ET miss ) Additional objects, e.g. electrons, muons, taus, photons depending on decay chains Production cross-section of SUSY particles electroweak strong 3rd gen strong Search strategies developed by ATLAS target all these SUSY production modes Also quite a few motivations to study BSM at the EW scale: Dark matter is WIMPs? Gauge group unification? Hierarchy problem? Assuming new physics at some high scale, fine tuning can be greatly reduced by BSM near the EW scale arxiv: ATLAS excludes squarks < 850GeV for eight Catrin Bernius, NYU degenerate squarks, m(lsp) = 0 12 gluinos up to 1330GeV excluded (m(lsp)=0)

13 SUSY Searches in Z+jets+MET arxiv: Two searches presented with SUSY particles in final states with sameflavour opposite-sign lepton pair, jets and large missing transverse momentum at s = 8 TeV and integrated luminosity of 20.3 fb -1 considering: decays of squarks and gluinos with Z bosons in the final state (Z ll) resulting in a peak in the di-lepton invariant mass distribution (mll) around the Z-boson decays of heavy neutralinos leads to a rising distribution in mll that terminates at a kinematic endpoint (events with larger mll values would violate energy conservation in the decay of a neutralino) CRT: control region VRT: validation region SR: signal region Analysis: Look at events with a Z ll candidate ET miss > 225GeV and HT > 600 GeV (applied to SR and CR) HT is the sum of the pt of the jets and leptons VR regions at lower ET miss and HT to cross-check SM background estimation methods Main background (ttbar) estimated from data using eμ events with the same cuts as the SR, cross checked using Z side-bands Catrin Bernius, NYU 13

14 SUSY Searches in Z+jets+MET arxiv: Results: squark/gluino case: excess of events above the expected SM background with a significance of 3σ (1.7σ) in the ee (μμ) channel neutralino case: data is well-described by expected SM background Catrin Bernius, NYU 14

15 SUSY EW & Stop Pair Production Summary Summary of ATLAS searches for electroweak production of charginos and neutralinos based on 20fb -1 at s = 8 TeV: Exclusion limits at 95% CL are shown in the mchargino-mneutralino plane Four decay modes of the charginos and neutralinos are considered separately with 100% branching fraction, decays via sleptons and sneutrinos occur with 50% probability each Summary of dedicated ALTAS searches for top squark (stop) pair production based on 20/fb at s = 8 TeV and 4.7/fb at s = 7 TeV: Exclusion limits at 95% CL are shown in the stop1-neutralino1 mass plane Three decay modes are considered separately with 100% BR Stringent limits for EW production and production of third generation particles placed! PHYSICS/CombinedSummaryPlots/SUSY/ Catrin Bernius, NYU 15

16 Summary of ATLAS SUSY Searches ATLAS SUSY Searches* - 95% CL Lower Limits Status: Feb 2015 Model e,µ,τ,γ Jets E miss T ATLAS Preliminary s =7,8TeV L dt[fb 1 ] Mass limit Reference Mass reach of ATLAS searches for Supersymmetry: only a representative selection of available results is show blue (green) bands indicate 7 TeV (8 TeV) data results Inclusive Searches 3 rd gen. g med. 3 rd gen. squarks direct production EW direct Long-lived particles RPV MSUGRA/CMSSM jets Yes 20.3 q, g 1.7 TeV m( q)=m( g) q q, q q χ 0 1 q qγ, q q χ 0 1 (compressed) jets Yes 20.3 q 850 GeV m( χ 0 1)=0 GeV, m(1 st gen. q)=m(2 nd gen. q) γ 0-1 jet Yes 20.3 q 250 GeV m( q)-m( χ 0 1)=m(c) g g, g q q χ jets Yes 20.3 g 1.33 TeV m( χ 0 1)=0 GeV g g, g qq χ ± 1 qqw ± χ e,µ 3-6 jets Yes 20 g 1.2 TeV m( χ 0 1)<300 GeV, m( χ ± )=0.5(m( χ 0 1)+m( g)) g g, g qq(ll/lν/νν) χ 0 2 e,µ jets - 20 g 1.32 TeV m( χ 0 1)=0GeV GMSB ( l NLSP) 1-2 τ + 0-1l 0-2 jets Yes 20.3 g 1.6 TeV tanβ > GGM (bino NLSP) 2 γ - Yes 20.3 g 1.28 TeV m( χ 0 1)>50 GeV ATLAS-CONF GGM (wino NLSP) 1 e,µ+ γ - Yes 4.8 g 619 GeV m( χ 0 1)>50 GeV ATLAS-CONF GGM (higgsino-bino NLSP) γ 1 b Yes 4.8 g 900 GeV m( χ 0 1)>220 GeV GGM (higgsino NLSP) 2 e,µ(z) 0-3 jets Yes 5.8 g 690 GeV m(nlsp)>200 GeV ATLAS-CONF Gravitino LSP 0 mono-jet Yes 20.3 F 1/2 scale 865 GeV m( G)> ev, m( g)=m( q)=1.5 TeV g b b χ b Yes 20.1 g 1.25 TeV m( χ 0 1)<400 GeV g t t χ jets Yes 20.3 g 1.1 TeV m( χ 0 1) <350 GeV g t t χ e,µ 1 3 b Yes 20.1 g 1.34 TeV m( χ 0 1)<400 GeV g b t χ e,µ 3 b Yes 20.1 g 1.3 TeV m( χ 0 1)<300 GeV b 1 b 1, b 1 b χ b Yes 20.1 b GeV m( χ 0 1)<90 GeV b 1 b 1, b 1 t χ ± 1 2 e,µ(ss) 0-3 b Yes 20.3 b GeV m( χ ± 1 )=2 m( χ 0 1) t 1 t 1, t 1 b χ ± e,µ 1-2 b Yes 4.7 t GeV GeV m( χ ± 1 )=2m( χ 0 1), m( χ 0 1)=55 GeV , t 1 t 1, t 1 Wb χ 0 1 or t χ e,µ 0-2 jets Yes 20.3 t GeV GeV m( χ 0 1)=1 GeV , t 1 t 1, t 1 t χ e,µ 1-2 b Yes 20 t GeV m( χ 0 1)=1 GeV , t 1 t 1, t 1 c χ mono-jet/c-tag Yes 20.3 t GeV m( t 1)-m( χ 0 1)<85 GeV t 1 t 1 (natural GMSB) 2 e,µ(z) 1 b Yes 20.3 t GeV m( χ 0 1)>150 GeV t 2 t 2, t 2 t 1 + Z 3 e,µ(z) 1 b Yes 20.3 t GeV m( χ 0 1)<200 GeV l L,R l L,R, l l χ e,µ 0 Yes 20.3 l GeV m( χ 0 1)=0 GeV χ + 1 χ 1, χ + 1 lν(l ν) 2 e,µ 0 Yes 20.3 χ ± GeV m( χ 0 1)=0 GeV, m( l, ν)=0.5(m( χ ± 1 )+m( χ 0 1)) χ + 1 χ 1, χ + 1 τν(τ ν) 2 τ - Yes 20.3 χ ± GeV m( χ 0 1)=0 GeV, m( τ, ν)=0.5(m( χ ± 1 )+m( χ 0 1)) χ ± 1 χ0 2 l L ν l L l( νν),l ν l L l( νν) 3 e,µ 0 Yes 20.3 χ ± 1, χ GeV m( χ ± 1 )=m( χ 0 2), m( χ 0 1)=0, m( l, ν)=0.5(m( χ ± 1 )+m( χ 0 1)) χ ± 1 χ0 2 W χ 0 1Z χ e,µ 0-2 jets 1 Yes 20.3 χ ± 420 GeV m( χ ± 1 )=m( χ 0 2), m( χ 0 1)=0, sleptons decoupled , , χ 0 2 χ ± 1 χ0 2 W χ 0 1h χ 0 1, h b b/ww/ττ/γγ e,µ,γ 0-2 b Yes 20.3 χ ± 250 GeV m( χ ± 1 )=m( χ 0 2), m( χ 0 1)=0, sleptons decoupled , χ 0 2 χ 0 2 χ0 3, χ 0 2,3 l R l 4 e,µ 0 Yes 20.3 χ GeV m( χ 0 2)=m( χ 0 3), m( χ 0 1)=0, m( l, ν)=0.5(m( χ 0 2)+m( χ 0 2,3 1)) Direct χ + 1 χ 1 prod., long-lived χ ± 1 Disapp. trk 1 jet Yes 20.3 χ ± m( χ ± 1 )-m( χ 0 1)=160 MeV, τ( χ ± GeV 1 )=0.2 ns Stable, stopped g R-hadron jets Yes 27.9 g 832 GeV m( χ 0 1)=100 GeV, 10 µs<τ( g)<1000 s Stable g R-hadron trk g 1.27 TeV GMSB, stable τ, χ 0 1 τ(ẽ, µ)+τ(e,µ) 1-2 µ χ GeV 10<tanβ< GMSB, χ 0 1 γ G, long-lived χ 0 2 γ - 1 Yes 20.3 χ GeV 2<τ( χ 0 1)<3 ns,sps8model q q, χ 0 1 qqµ (RPV) 1 µ, displ.vtx q 1.0 TeV 1.5 <cτ<156 mm, BR(µ)=1, m( χ 0 1)=108 GeV ATLAS-CONF LFV pp ν τ + X, ν τ e + µ 2 e,µ ντ 1.61 TeV λ 311 =0.10, λ132= LFV pp ν τ + X, ν τ e(µ) + τ 1 e,µ+ τ ντ 1.1 TeV λ 311 =0.10, λ1(2)33= Bilinear RPV CMSSM 2 e,µ(ss) 0-3 b Yes 20.3 q, g 1.35 TeV m( q)=m( g), cτ LS P<1 mm χ + 1 χ 1, χ + 1 W χ 0 1, χ 0 1 ee ν µ, eµ ν e 4 e,µ - Yes 20.3 χ ± GeV m( χ 0 1)>0.2 m( χ ± 1 ), λ χ + 1 χ 1, χ + 1 W χ 0 1, χ 0 1 ττ ν e, eτ ν τ 3 e,µ+ τ - Yes 20.3 χ ± GeV m( χ 0 1)>0.2 m( χ ± 1 ), λ g qqq jets g 916 GeV BR(t)=BR(b)=BR(c)=0% ATLAS-CONF g t 1 t, t 1 bs 2 e,µ(ss) 0-3 b Yes 20.3 g 850 GeV Other Scalar charm, c c χ c Yes 20.3 c 490 GeV m( χ 0 1)<200 GeV s =7TeV full data s =8TeV partial data s =8TeV full data Mass scale [TeV] *Only a selection of the available mass limits on new states or phenomena is shown. All limits quoted are observed minus 1σ theoretical signal cross section uncertainty. Catrin Bernius, NYU 16

17 Hints from New Physics Searches High mass di-boson resonance searches with boson-tagged jets at s = 8 TeV (arxiv: ) Di-boson resonances are predicted in several extensions to the SM, such as technicolor warped extra dimensions Grand Unified Theories Production of W, Z bosons from decay of the massive resonance together with large transverse momentum relative to their mass: each boson is reconstructed in a single large-radius jet looking for resonance structure on a smoothly falling dijet invariant mass spectrum Results: Most significant discrepancy with the background-only model occurs around 2 TeV in WZ channel with local significance of 3.4σ Global significance with entire mass range in all three channels (WZ, WW, ZZ) of 2.5σ Catrin Bernius, NYU 17

18 More Hints from New Physics Searches B-jet(s) with same-sign leptons and ET miss (arxiv: ) SM processes rarely produce these final states but several BSM models predict them; considered: vector-like quarks, chiral b -quark pair production, two positively charged top quarks, 4-top production 2.5 σ excess with 2/3 b-jets and large MET and HT Main background is tt+x (taken from simulation) tt+x cross-checked with several generators, scaled to NLO Di-jet angular analysis (arxiv: ) LHC di-jet production dominated by t-channel gluon exchange Sensitive to new contact interactions, quark compositeness QCD prediction reweighted to NLO with EW corrections Amazing agreement with theory, small ~2σ possible hint (?) at large mass hh resonances in the bb γγ channel (arxiv: ): Searches for non-sm physics with events consistent with either resonant (X hh) or non-resonant pair production of Higgs bosons Look in the clean bb+γγ final-state Small excess (2.1 σ at mx ~300 GeV) p-value: 2.5σ Catrin Bernius, NYU 18

19 More Hints from New Physics Searches B-jet(s) with same-sign leptons and ET miss (arxiv: ) SM processes rarely produce these final states but several BSM models predict them; considered: vector-like quarks, chiral b -quark pair production, two positively charged top quarks, 4-top production 2.5 σ excess with 2/3 b-jets and large MET and HT Main background is tt+x (taken from simulation) tt+x cross-checked with several generators, scaled to NLO Di-jet angular analysis (arxiv: ) LHC di-jet production dominated by t-channel gluon exchange Sensitive to new contact interactions, quark compositeness QCD prediction reweighted to NLO with EW corrections Amazing agreement with theory, small ~2σ possible hint (?) at large mass FOLLOW UP IN RUN 2!! hh resonances in the bb γγ channel (arxiv: ): Searches for non-sm physics with events consistent with either resonant (X hh) or non-resonant pair production of Higgs bosons Look in the clean bb+γγ final-state Small excess (2.1 σ at mx ~300 GeV) p-value: 2.5σ Catrin Bernius, NYU 19

20 New Physics Summary Mass reach of ATLAS searches for new phenomena other than Supersymmetry: only a representative selection of available results is show blue (green) bands indicate 7 TeV (8 TeV) data results atlas.web.cern.ch/ Atlas/GROUPS/ PHYSICS/ CombinedSummaryPlo ts/exotics/ Extra dimensions Gauge bosons CI DM LQ Heavy quarks Excited fermions Other ATLAS Exotics Searches* - 95% CL Exclusion Status: March 2015 Model l, γ Jets E miss T L dt[fb 1 ] Mass limit Reference ADD G KK + g/q 1 j Yes 20.3 M D 5.25 TeV n = ADD non-resonant ll 2e, µ 20.3 M S 4.7 TeV n =3HLZ ADD QBH lq 1 e, µ 1j 20.3 M th 5.2 TeV n = ADD QBH 2j 20.3 M th 5.82 TeV n = ADD BH high N trk 2 µ (SS) 20.3 M th 4.7 TeV n =6, M D =3TeV, non-rot BH ADD BH high p T 1 e, µ 2 j 20.3 M th 5.8 TeV n =6, M D =3TeV, non-rot BH ADD BH high multijet 2 j 20.3 M th 5.8 TeV n =6, M D =3TeV, non-rot BH Preliminary RS1 G KK ll 2 e, µ 20.3 G KK mass 2.68 TeV k/m Pl = RS1 G KK γγ 2 γ 20.3 G KK mass 2.66 TeV k/m Pl =0.1 Preliminary Bulk RS G KK ZZ qqll 2 e, µ 2j/1J 20.3 G KK mass 740 GeV k/m Pl = Bulk RS G KK WW qqlν 1 e, µ 2j/1J Yes 20.3 W mass 700 GeV k/m Pl = Bulk RS G KK HH b bb b 4b 19.5 G KK mass GeV k/m Pl =1.0 ATLAS-CONF Bulk RS g KK tt 1 e, µ 1 b, 1J/2j Yes 20.3 g KK mass 2.2 TeV BR = ATLAS-CONF UED / RPP 2 e, µ (SS) 1 b, 1 j Yes 20.3 KK mass 960 GeV Preliminary SSM Z ll 2 e, µ 20.3 Z mass 2.9 TeV SSM Z ττ 2 τ 19.5 Z mass 2.02 TeV SSM W lν 1 e, µ Yes 20.3 W mass 3.24 TeV EGM W WZ lν l l 3 e, µ Yes 20.3 W mass 1.52 TeV EGM W WZ qqll 2 e, µ 2j/1J 20.3 W mass 1.59 TeV HVT W WH lνbb 1 e, µ 2 b Yes 20.3 W mass 1.47 TeV g V =1 Preliminary LRSM W tb R 1 e, µ 2 b, 0-1 j Yes 20.3 W mass 1.92 TeV LRSM W R tb 0 e, µ 1 b, 1 J 20.3 W mass 1.76 TeV CI qqqq 2j 17.3 Λ 12.0 TeV η LL = 1 Preliminary CI qqll 2 e, µ 20.3 Λ 21.6 TeV η LL = CI uutt 2 e, µ (SS) 1 b, 1 j Yes 20.3 Λ 4.35 TeV C LL =1 Preliminary EFT D5 operator (Dirac) 0 e, µ 1 j Yes 20.3 M 974 GeV at 90% CL for m(χ) < 100 GeV EFT D9 operator (Dirac) 0 e, µ 1J, 1 j Yes 20.3 M 2.4 TeV at 90% CL for m(χ) < 100 GeV Scalar LQ 1 st gen 2 e 2 j 1.0 LQ mass 660 GeV β = Scalar LQ 2 nd gen 2 µ 2 j 1.0 LQ mass 685 GeV β = Scalar LQ 3 rd gen 1 e, µ, 1τ 1b,1j 4.7 LQ mass 534 GeV β = VLQ TT Ht + X, Wb + X 1 e, µ 1 b, 3 j Yes 20.3 T mass 785 GeV isospin singlet ATLAS-CONF VLQ TT Zt + X 2/ 3 e, µ 2/ 1 b 20.3 T mass 735 GeV T in (T,B) doublet VLQ BB Zb + X 2/ 3 e, µ 2/ 1 b 20.3 B mass 755 GeV B in (B,Y) doublet VLQ BB Wt + X 1 e, µ 1 b, 5 j Yes 20.3 B mass 640 GeV isospin singlet Preliminary T 5/3 Wt 1 e, µ 1 b, 5 j Yes 20.3 T 5/3 mass 840 GeV Preliminary Excited quark q qγ 1 γ 1j 20.3 q mass 3.5 TeV only u and d, Λ=m(q ) Excited quark q qg 2j 20.3 q mass 4.09 TeV only u and d, Λ=m(q ) Excited quark b Wt 1 or 2 e, µ 1 b, 2 j or 1 j Yes 4.7 b mass 870 GeV left-handed coupling Excited lepton l lγ 2 e, µ, 1γ 13.0 l mass 2.2 TeV Λ=2.2TeV Excited lepton ν lw, νz 3 e, µ, τ 20.3 ν mass 1.6 TeV Λ=1.6TeV LSTC a T W γ 1 e, µ, 1γ Yes 20.3 a T mass 960 GeV LRSM Majorana ν 2 e, µ 2j 2.1 N 0 mass 1.5 TeV m(w R )=2TeV, no mixing Higgs triplet H ±± ll 2 e, µ (SS) 20.3 H ±± mass 551 GeV DY production, BR(H ±± ll)=1 L Higgs triplet H ±± lτ 3 e, µ, τ 20.3 H ±± mass 400 GeV DY production, BR(H ±± lτ)=1 L Monotop (non-res prod) 1 e, µ 1 b Yes 20.3 spin-1 invisible particle mass 657 GeV a non res = Multi-charged particles 20.3 multi-charged particle mass 785 GeV DY production, q =5e Preliminary Magnetic monopoles 2.0 monopole mass 862 GeV DY production, g =1g D s = 7 TeV s = 8 TeV *Only a selection of the available mass limits on new states or phenomena is shown ATLAS Preliminary L dt = ( ) fb 1 s = 7, 8 TeV Mass scale [TeV] Catrin Bernius, NYU 20

21 Prospects from Run 2 Detector upgrades & Commissioning Glimpse of Run 2 performance Higgs & SUSY prospects 21

22 ATLAS Upgrades for Run 2 Detector upgrades: Additional silicon layer (IBL) improved tracking performance (e.g. ATL-INDET-PROC ) Diamond Beam Monitor (Background and Luminosity at 3.2 < η < 3.5) Upgrade of Beam Condition Monitors New LUCID detectors New beam pipe Complete muon coverage Various repairs (TRT, LAr, Tile) Software: Improved reconstruction software New analysis framework with new data format Trigger/DAQ: Central Trigger Processor allowing for topological trigger Fast tracker (FTK): Real-time tracking for the HLT Increase L1 bandwidth from 75kHz 100 khz Higher HLT output rate (limited by storage capacity of ~1-1.5kHz) Merge of L2+EF farms, network upgrade Flexible resource allocation in conjunction with combined network Catrin Bernius, NYU 22

23 Commissioning of the ATLAS Detector First 13 TeV Stable Beam Collisions on June 3rd! Commissioning of the detector & software with the first data! Catrin Bernius, NYU 23

24 Prospects for SUSY in Run 2 Expected sensitivity studies for gluino and squark searches using the early LHC 13 TeV studied for three cases: gluino pair production in final states with large missing transverse momentum and no leptons or exactly one isolated lepton bottom squark pair production E.g. for gluino pair production with only a gluino and the lightst neutralino, a gluino with mass of 1.5 TeV could be seen with 3σ significance with 5 fb -1 ATL-PHYS-PUB Catrin Bernius, NYU 24

25 Conclusion ATLAS and the LHC achieved important results Higgs boson discovery Strong constraints on new physics phenomena Still many unanswered questions: Dark Matter candidate Naturalness of the Higgs Boson and many more! Upgraded LHC & ATLAS detector Tremendous achievement of consolidation of the machine Smooth start-up On-going commissioning of the ATLAS detector so far very successful Exciting times ahead: Run 2 will offer the opportunity to continue to explore the standard model and beyond with the upgraded ATLAS detector!! Catrin Bernius, NYU 25