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

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

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LHC Run1 Experimental Results Dmytro Kovalskyi (UCSD) Introduction There are many interesting results produced by LHC experiments Its unrealistic to show them all Ill concentrate on a few topics that are interesting from my point of

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LHC Run1 Experimental Results

Dmytro Kovalskyi (UCSD)

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LHC Run1 Results - Dmytro Kovalskyi April 7, 2014

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

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LHC Run1 Results - Dmytro Kovalskyi April 7, 2014

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

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LHC Run 1

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Missing Energy Resolution

Z→μμ

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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

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Higgs Discovery

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Discovery

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Signal is Solid

H→ZZ→4l - golden channel

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ATLAS : µZZ(mH = 125.5) = 1.44+0.40

−0.35

CMS : µZZ(mH = 125.6) = 0.93+0.29

−0.25

ATLAS : 6.6σ(4.4σexpected) CMS : 6.8σ(6.7σexpected)

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LHC Run1 Results - Dmytro Kovalskyi April 7, 2014

Higgs to VV

Main decay channels: ZZ, WW, γγ Signal present in all of them - consistent with SM

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Fermionic decay channels

H→ττ more than 5σ significance if combine ATLAS and CMS First hints of H→bb - need more data

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CMS ttH

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ATLAS ttH

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Higgs Properties

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Higgs Widths

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

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σon−peak ∝ g2

ggHg2 HZZ

ΓH σoff−peak ∝ g2

ggHg2 HZZ

  • N. Kauer and G. Passarino, JHEP 08 (2012) 116
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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

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Channels and Methods

H→ZZ→4ℓuses special discriminator:

MELA (matrix element with mZ1, mZ2 and 5 angles)

H→ZZ→2ℓ2ν

16 Signal Enhanced Background Enhanced

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Results

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H→ZZ→4ℓ H→ZZ→2ℓ2ν Combined

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Higgs Mass

ATLAS measures somewhat different mass in H→ZZ→4ℓ vs H→γγ

The difference is not statistically significant

Both ATLAS and CMS combined results are fully consistent

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Relative Cross-section

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Couplings

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Spin

Results are consistent with CP even SM Higgs

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SM Properties

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SM Cross Sections

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[pb] σ Production Cross Section,

  • 1

10 1 10

2

10

3

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5

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CMS Preliminary

Feb 2014

W Z γ W γ Z WW WZ ZZ WW → γ γ qqll EW γ WV tt t-ch t tW s-ch t γ tt ttZ σ Δ in exp. H σ Δ Th. ggH qqH VBF VH ttH

CMS 95%CL limit )

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5.0 fb ≤ 7 TeV CMS measurement (L )

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19.6 fb ≤ 8 TeV CMS measurement (L 7 TeV Theory prediction 8 TeV Theory prediction

https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsCombined

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Diboson Cross-section

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QCD (Z+jets)

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QCD (W+jets)

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Physics Beyond Standard Model (direct searches)

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ATLAS SUSY Limits

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CMS SUSY Limits

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SUSY

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2/28/14 CMS Physics Week 4 gluino mass [GeV] 600 700 800 900 1000 1100 1200 1300 1400 1500 LSP mass [GeV] 100 200 300 400 500 600 700 800 900 Observed SUSY theory ! Observed -1 Expected m(gluino) - m(LSP) = 2 m(top) m(gluino) - m(LSP) = m(W) + m(top) Nov 2013 = 8 TeV s CMS Preliminary 1 " # t t $ g ~ production, g ~
  • g
~
  • 1
) 19.4 fb T +H T E SUS-12-024 0-lep (
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SUS-13-004 0+1-lep (razor) 19.3 fb
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6) 19.4 fb % jets SUS-13-007 1-lep (n
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SUS-13-016 2-lep (OS+b) 19.7 fb
  • 1
SUS-13-013 2-lep (SS+b) 19.5 fb
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SUS-13-008 3-lep (3l+b) 19.5 fb

Gluino mass ~ 1350GeV

stop mass [GeV] 100 200 300 400 500 600 700 800 LSP mass [GeV] 50 100 150 200 250 300 350 400 450 500 W =m 1 ! "
  • m
t ~ m t =m 1 ! "
  • m
t ~ m SUSY 2013 = 8 TeV s CMS Preliminary production t ~
  • t
~ ) 1 ! " t # t ~ (
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SUS-13-004 0-lep+1-lep (Razor) 19.3 fb ) 1 ! " t # t ~ (
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SUS-13-011 1-lep (leptonic stop)19.5 fb , x=0.25) 1 + ! " b # t ~ (
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SUS-13-011 1-lep (leptonic stop)19.5 fb Observed Expected W =m 1 ! "
  • m
1 ± ! " m

Stop mass ~ 750GeV

(GeV) q m 400 600 800 1000 1200 (GeV) LSP m 200 400 600 800
  • 2
10
  • 1
10 1 10 = 8 TeV s ,
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CMS Preliminary, 19.5 fb NLO+NLL exclusion 1 ! " q # q ~ , q ~ q ~ # pp ) c ~ , s ~ , d ~ , u ~ ( R q ~ + L q ~ q ~
  • ne light
theory $ 1 ± Observed experiment $ 1 ± Expected 95% C.L. upper limit on cross section (pb)

10x degenerate squarks ~ 950GeV

PAS

Sbottom mass ~ 750GeV

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Cross-section Scaling 8→13 TeV

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Xsection Ratios 13/8 TeV ~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

D t

1350GeV gluino: x30 950GeV squark: x20 750GeV squark: x9 350GeV X+-X0: x3 top pairs: x4

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Dark Matter

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CMS Exotica Results

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CMS Exotica Physics Group Summary – March, 2014 stopped gluino (cloud) stopped stop (cloud) HSCP gluino (cloud) HSCP stop (cloud) q=2/3e HSCP q=3e HSCP neutralino, ctau=25cm, ECAL time 1 2 3 4 RS1(γγ), k=0.1 RS1(ee,uu), k=0.1 RS1(jj), k=0.1 RS1(WW→4j), k=0.1 RS1(ZZ→4j), k=0.1 bulk RS(ZZ→lljj), k=0.5 1 2 3 4 coloron(jj) x2 coloron(4j) x2 gluino(3j) x2 gluino(jjb) x2 1 2 3 4

RS Gravitons Multijet Resonances Long-Lived Particles

SSM Z'(ττ) SSM Z'(jj) SSM Z'(bb) SSM Z'(ee)+Z'(µµ) SSM W'(jj) SSM W'(lv) SSM W'(WZ→lvll) SSM W'(WZ→4j) 1 2 3 4

Heavy Gauge Bosons

CMS Preliminary

j+MET, SI DM=100 GeV, Λ j+MET, SD DM=100 GeV, Λ γ+MET, SI DM=100 GeV, Λ γ+MET, SD DM=100 GeV, Λ l+MET, ξ=+1, SI DM=100 GeV, Λ l+MET, ξ=+1, SD DM=100 GeV, Λ l+MET, ξ=-1, SI DM=100 GeV, Λ l+MET, ξ=-1, SD DM=100 GeV, Λ 1 2 3 4

Dark Matter

LQ1(ej) x2 LQ1(ej)+LQ1(νj) LQ2(μj) x2 LQ2(μj)+LQ2(νj) LQ3(νb) x2 LQ3(τb) x2 LQ3(τt) x2 1 2 3 4

Leptoquarks

e* (M=Λ) μ* (M=Λ) q* (qg) q* (qγ) b* 1 2 3 4

Excited Fermions

dijets, Λ+ LL/RR dijets, Λ- LL/RR dimuons, Λ+ LLIM dimuons, Λ- LLIM single e, Λ HnCM single μ, Λ HnCM inclusive jets, Λ+ inclusive jets, Λ- 3 6 9 12 15 ADD (γγ), nED=4, MS ADD (ee,μμ), nED=4, MS ADD (j+MET), nED=4, MD ADD (γ+MET), nED=4, MD QBH, nED=4, MD=4 TeV NR BH, nED=4, MD=4 TeV Jet Extinction Scale String Scale (jj) 3 6 9 12 15

Large Extra Dimensions Compositeness

https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsEXO

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Boosted Top

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CMS Searches for New Physics Beyond Two Generations (B2G) 95% CL Exclusions (TeV)

0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 t+MET,scalar(had) t+MET,vectorial(had) tW(semilep) → B' bH(semilep) → B' bZ(semilep) → B' bZ(dilep) → B' tW(multilep) → B' bH(multilep) → B' bZ(multilep) → B' bW(combined) → T' tH(combined) → T' tZ(combined) → T' T'(5/3)(dilep,ss)

Dark matter Vector-like B' Vector-like T'

0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 t*(semilep) t*(dilep) W'(lep) Z'(1.2%)(all-had) (all-had) KK g Z'(1.2%)(semilep) (semilep) KK g Z'(1.2%)(combined) (combined) KK g

Excited tops tb Resonances Resonances t t

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Beyond SM with Higgs

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Vector Boson Scattering (indirect searches)

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EWK W/Z production

EWK: t-channel vector boson exchange Observed 5σ effect

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arXiv:1401.7610 ¡

Signal

Background

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Anomalous Triple Gauge Couplings

Approaching LEP limits New methods: merged fat jet Results are coming slowly

Trying to fix it for next RUN

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Anomalous Quoter Gauge Couplings

Exclusive γγ→WW exceptional sensitivity

Very hard (impossible?) in high pileup

Tools and Methods are in development

EFT with FeynmanRules in Madgraph becomes default

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Top Mass

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Stability of the SM vacuum

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SM Higgs discovered, no BSM. Pushing SM to Plank scale the measured Mh and Mtop place the SM vacuum in a meta-stable state due to negative Higgs coupling

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Top Mass Combination

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Top Mass combination

LHC vs Tevatron - remarkably consistent results

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Top Mass - Latest from CMS

Lepton+MET+jets Simultaneous fit for top mass and energy scale using W-mass constraint Significant change in the central value

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W mass before fit W mass for good fits Top mass for good fits Top mass before fit

σ = 172.04 ± 0.19 ± 0.75GeV

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Systematics

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Summary

Higgs discovered

Standard Model is complete

Higgs boson looks exactly as SM predicts Searches for BSM show nothing new

Naturalness is looking decidedly less natural

Run2 will increase energy to 13TeV

Last time in a while that we may have a quick discovery

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