LHC Run1 Experimental Results Dmytro Kovalskyi (UCSD) - PowerPoint PPT Presentation

LHC Run1 Experimental Results Dmytro Kovalskyi (UCSD)

Introduction There are many interesting results produced by LHC experiments It’s unrealistic to show them all I’ll concentrate on a few topics that are interesting from my point of view Latest Moriond experimental summary talks: Pierluigi Campana (Frascatti) http://moriond.in2p3.fr/QCD/2014/Saturday/Campana.pdf Kevin Einsweiler (Lawrence Berkeley Lab) https://indico.in2p3.fr/getFile.py/access?contribId=227&sessionId=1&resId=1&materialId=slides&confId=9116 April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 2

Overview Run1 overview and Run2 projections Standard Model Higgs boson is discovered - SM is complete In depth: Higgs width measurement SM Properties Physics beyond the Standard Model Direct searches for SUSY and Exotic models Indirect searches by exploring vector boson scattering Vacuum stability and top mass April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 3

LHC Run 1 Missing Energy Resolution Z →μμ April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 4

Run 2: 2015-2017 Target Integrated lumi: 100/fb Pileup is a real concern Jet and MET resolution degrades Event reconstruction issues Triggers for Higgs and lighter object is a challenge April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 5

Higgs Discovery

Discovery April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 7

Signal is Solid H → ZZ → 4l - golden channel ATLAS : µ ZZ (m H = 125 . 5) = 1 . 44 +0 . 40 ATLAS : 6 . 6 σ (4 . 4 σ expected) − 0 . 35 CMS : µ ZZ (m H = 125 . 6) = 0 . 93 +0 . 29 CMS : 6 . 8 σ (6 . 7 σ expected) − 0 . 25 April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 8

Higgs to VV Main decay channels: ZZ, WW, γγ Signal present in all of them - consistent with SM April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 9

Fermionic decay channels H →ττ more than 5 σ significance if combine ATLAS and CMS First hints of H → bb - need more data April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 10

CMS ttH April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 11

ATLAS ttH April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 12

Higgs Properties

Higgs Widths N. Kauer and G. Passarino, JHEP 08 (2012) 116 g 2 ggH g 2 HZZ σ on − peak ∝ Γ H σ o ff − peak ∝ g 2 ggH g 2 HZZ Direct limit on Higgs width: 3.4GeV @ 95%C.L About 7.6% of total cross-section in the ZZ final state, but can be enhanced by experimental cuts April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 14

Analysis Strategy On-peak cross-section - Standard Higgs analysis Off-peak component predicts a broad excess at larger mass ZZ has best sensitivity in this region Closer to the peak backgrounds are getting larger and more complex to measure a broad excess Dominant background is qq → ZZ April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 15

Channels and Methods Signal Enhanced Background Enhanced H → ZZ → 4 ℓ uses special discriminator: MELA (matrix element with mZ1, mZ2 and 5 angles) H → ZZ → 2 ℓ 2 ν April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 16

Results H → ZZ → 4 ℓ H → ZZ → 2 ℓ 2 ν Combined April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 17

Higgs Mass ATLAS measures somewhat different mass in H → ZZ → 4 ℓ vs H →γγ The difference is not statistically significant Both ATLAS and CMS combined results are fully consistent April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 18

Relative Cross-section April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 19

Couplings April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 20

Spin Results are consistent with CP even SM Higgs April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 21

SM Properties

SM Cross Sections https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsCombined CMS Preliminary Feb 2014 [pb] -1 7 TeV CMS measurement (L 5.0 fb ) ≤ -1 5 8 TeV CMS measurement (L 19.6 fb ) ≤ 10 σ 7 TeV Theory prediction Production Cross Section, 8 TeV Theory prediction 4 10 CMS 95%CL limit 3 10 2 10 10 1 -1 10 γ γ → EW VBF W Z W γ Z γ WW WZ ZZ WV γ tt t tW t tt γ ttZ ggH VH ttH WW qqll t-ch s-ch qqH Th. in exp. Δ σ Δ σ H April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 24

Diboson Cross-section April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 25

QCD (Z+jets) April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 26

QCD (W+jets) April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 27

Physics Beyond Standard Model (direct searches)

ATLAS SUSY Limits April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 29

CMS SUSY Limits April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 30

SUSY ~ ~ ~ ~ ~ # 0 t - t production g - g production, g t t $ " 1 500 LSP mass [GeV] LSP mass [GeV] CMS Preliminary CMS Preliminary -1 SUS-12-024 0-lep ( E +H ) 19.4 fb 900 T T -1 SUS-13-004 0+1-lep (razor) 19.3 fb 450 Observed -1 s = 8 TeV s = 8 TeV SUS-13-007 1-lep (n % 6) 19.4 fb jets 800 -1 SUS-13-016 2-lep (OS+b) 19.7 fb Nov 2013 SUSY 2013 Expected -1 SUS-13-013 2-lep (SS+b) 19.5 fb 400 Observed ~ -1 0 SUS-13-008 3-lep (3l+b) 19.5 fb -1 " SUS-13-004 0-lep+1-lep (Razor) 19.3 fb ( t # t ! ) SUSY Observed -1 700 ! 1 theory Expected m(gluino) - m(LSP) = m(W) + m(top) 350 ~ " 0 -1 SUS-13-011 1-lep (leptonic stop)19.5 fb ( t t ) # ! 1 600 ~ " + -1 300 SUS-13-011 1-lep (leptonic stop)19.5 fb ( t # b ! , x=0.25) 1 m(gluino) - m(LSP) = 2 m(top) 500 250 Gluino mass ~ 1350GeV Stop mass ~ 750GeV =m W =m t 0 0 -m " -m " 400 ! 1 ! 1 200 ~ ~ m m t t 300 150 W =m 0 200 -m " ! 1 100 ± m " ! 1 100 50 0 0 600 700 800 900 1000 1100 1200 1300 1400 1500 100 200 300 400 500 600 700 800 gluino mass [GeV] stop mass [GeV] -1 CMS Preliminary, 19.5 fb , s = 8 TeV 800 10 95% C.L. upper limit on cross section (pb) (GeV) ~ ~ ~ " 0 pp q q , q q NLO+NLL exclusion # # ! 1 Observed 1 ± $ theory LSP Expected 1 ± $ 10x degenerate experiment 600 m 1 Sbottom mass ~ 750GeV squarks ~ 950GeV ~ ~ ~ ~ ~ ~ q + q ( u , d , s , c ) PAS L R 400 -1 10 ~ one light q 200 -2 10 2/28/14 CMS Physics Week 4 0 400 600 800 1000 1200 m (GeV) q April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 31

Cross-section Scaling 8 → 13 TeV D Xsection Ratios 13/8 TeV t 1350GeV gluino: x30 950GeV squark: x20 750GeV squark: x9 350GeV X +- X 0 : x3 top pairs: x4 ~1/fb of 13TeV data surpasses our best gluino limits. ~3/fb of 13TeV data surpasses our sbottom and stop limits. There will be no relevant SM measurements at 13TeV April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 32

Dark Matter April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 33

CMS Exotica Results https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsEXO LQ1(ej) x2 stopped gluino (cloud) LQ1(ej)+LQ1( ν j) stopped stop (cloud) Long-Lived LQ2( μ j) x2 HSCP gluino (cloud) Leptoquarks LQ2( μ j)+LQ2( ν j) HSCP stop (cloud) Particles LQ3( ν b) x2 q=2/3e HSCP q=3e HSCP LQ3( τ b) x2 neutralino, ctau=25cm, ECAL time LQ3( τ t) x2 0 1 2 3 4 0 1 2 3 4 j+MET, SI DM=100 GeV, Λ RS1( γγ ), k=0.1 j+MET, SD DM=100 GeV, Λ RS1(ee,uu), k=0.1 γ +MET, SI DM=100 GeV, Λ RS1(jj), k=0.1 RS Gravitons Dark Matter γ +MET, SD DM=100 GeV, Λ RS1(WW → 4j), k=0.1 l+MET, ξ =+1, SI DM=100 GeV, Λ RS1(ZZ → 4j), k=0.1 l+MET, ξ =+1, SD DM=100 GeV, Λ bulk RS(ZZ → lljj), k=0.5 l+MET, ξ =-1, SI DM=100 GeV, Λ 0 1 2 3 4 l+MET, ξ =-1, SD DM=100 GeV, Λ 0 1 2 3 4 Heavy Gauge Compositeness SSM Z'( ττ ) Bosons SSM Z'(jj) dijets, Λ + LL/RR SSM Z'(bb) dijets, Λ - LL/RR SSM Z'(ee)+Z'(µµ) dimuons, Λ + LLIM SSM W'(jj) dimuons, Λ - LLIM SSM W'(lv) single e, Λ HnCM SSM W'(WZ → lvll) single μ , Λ HnCM SSM W'(WZ → 4j) inclusive jets, Λ + 0 1 2 3 4 inclusive jets, Λ - Excited 0 3 6 9 12 15 Fermions e* (M= Λ ) ADD ( γγ ), nED=4, MS μ * (M= Λ ) ADD (ee, μμ ), nED=4, MS q* (qg) ADD (j+MET), nED=4, MD q* (q γ ) Large Extra ADD ( γ +MET), nED=4, MD b* QBH, nED=4, MD=4 TeV Dimensions NR BH, nED=4, MD=4 TeV 0 1 2 3 4 Jet Extinction Scale coloron(jj) x2 Multijet String Scale (jj) coloron(4j) x2 0 3 6 9 12 15 gluino(3j) x2 Resonances CMS Preliminary gluino(jjb) x2 0 1 2 3 4 CMS Exotica Physics Group Summary – March, 2014 April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 34

Boosted Top CMS Searches for New Physics Beyond Two Generations (B2G) 95% CL Exclusions (TeV) T'(5/3)(dilep,ss) g (combined) KK T' tZ(combined) → Z'(1.2%)(combined) Vector-like T' t t Resonances T' tH(combined) → T' → bW(combined) g (semilep) KK B' bZ(multilep) → Z'(1.2%)(semilep) B' bH(multilep) → g (all-had) B' tW(multilep) → KK Vector-like B' B' bZ(dilep) → Z'(1.2%)(all-had) B' bZ(semilep) → W'(lep) B' bH(semilep) → tb Resonances B' tW(semilep) → t*(dilep) Dark matter t+MET,vectorial(had) Excited tops t*(semilep) t+MET,scalar(had) 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 April 7, 2014 LHC Run1 Results - Dmytro Kovalskyi 35