Frontiers of research at CERN and the computing and data management needs E.Elsen EGI Conference 2016. Science Park, Amsterdam, Apr 6-8, 2016
Experimental Tools of the Research Programme at CERN • LHC • ongoing run 2 @ 13 TeV • HL-LHC (>2025) • Fixed target programme • ISOLDE • AD-programme
…and • Year 2014 • 3.4 bn CPU hours • 100 PBytes storage
European Strategy • LHC and its upgrade Future energy frontier machines • e + e - linear collider in Japan • (not detailed here) • Accelerating science and innovation Societal benefits of European research in particle physics ν –physics • … •
Energy Frontier • The discovery of the Higgs boson is the start of a major programme of work to measure this particle’s properties with the highest possible precision for testing the validity of the Standard Model and to search for further new physics at the energy frontier. The LHC is in a unique position to pursue this programme. Europe’s top priority should be the exploitation of the full potential of the LHC, including the high-luminosity upgrade of the machine and detectors with a view to collecting ten times more data than in the initial design, by around 2030. This upgrade programme will also provide further exciting opportunities for the study of flavour physics and the quark-gluon plasma.
2015 LHC Luminosity (p-p) ATLAS CMS Peak 5 x 10 33 cm -1 s -1 Design 10 34 cm -1 s -1 Integrated Status of LHC machine and injectors SPC 14 Frédérick Bordry 14 th December 2015
A L I C E
L H C b
L H C b
C M S Measurement of Standard Model cross sections • Standard Model cross sections, incl. 13 TeV data • relevant cross sections vary over 8 orders of magnitude
C M S Inclusive Jets @ 13 TeV
C M S B-Mesons • 8 TeV Data • FONLL predictions • Good agreement at 13 TeV
A T L A S Measurement of the Higgs Cross Section • Combined significance from γγ and 4l ATLASFCONFF2015F069' expected 3.4 σ • observed 1.4 σ •
A T L A S Cross Sections as a function of √ s 12 10 [pb] inelastic Prediction ATLAS Preliminary -1 7 TeV, 20 b , Nat. Commun. 2, 463 (2011) µ Measurement -1 13 TeV, 63 b , ATLAS-CONF-2015-038 µ 11 10 σ inelastic pp W → Pythia8 -1 7 TeV, 36 pb , PRD 85, 072004 (2012) -1 13 TeV, 85 pb , ATLAS-CONF-2015-039 10 10 pp Z / * → γ -1 7 TeV, 36 pb , PRD 85, 072004 (2012) -1 13 TeV, 85 pb , ATLAS-CONF-2015-039 9 5 10 10 pp W FEWZ → pp t t → -1 7 TeV, 4.6 fb , Eur. Phys. J. C 74:3109 (2014) pp Z / * → γ FEWZ -1 8 TeV, 20.3 fb , Eur. Phys. J. C 74:3109 (2014) 8 4 10 10 -1 13 TeV, 78 pb , ATLAS-CONF-2015-049 pp tq → -1 7 TeV, 4.6 fb , PRD 90, 112006 (2014) 3 7 10 10 -1 8 TeV, 20.3 fb , ATLAS-CONF-2014-007 -1 13 TeV, 3.2 fb , ATLAS-CONF-2015-079 top++ NNLO+NNLL pp H → 6 2 pp t t → 10 10 -1 7 TeV, 4.5 fb , arXiv:1507.04548 NLO+NNLL pp tq → -1 8 TeV, 20.3 fb , arXiv:1507.04548 -1 13 TeV, 3.2 fb , ATLAS-CONF-2015-069 LHC-XS pp H → 5 1 10 10 pp ZZ → MCFM pp ZZ → -1 7 TeV, 4.6 fb , JHEP 03, 128 (2013) -1 8 TeV, 20.3 fb , ATLAS-CONF-2013-020 0 -1 10 13 TeV, 3.2 fb , STDM-2015-13 4 6 8 10 12 14 s [ ] TeV 20'
C M S Search for Diboson resonances • Run 1: CMS ~2 σ excess near 1.8-2.0 TeV � s • • Repeat search at 13 TeV using most sensitive channels: l ν J, JJ • n • Analysis categorised in dijet mass for optimal sensitivity to WW, WZ, ZZ signals • • • 13 TeV: no excess observed in the region of interest near 2 TeV oson resonances • • More data needed to fully exclude Run 1 excess G Bulk � ZZ (JJ) G Bulk � WW ( lνJ+JJ ) W’ � WZ ( lνJ+JJ ) � s • Run 1 • e n • • f • s � ZZ (JJ) � W’ � G lνJ+JJ lνJ+JJ
A T L A S Search for Dilepton resonances ATLASFCONFF2015F070' Search%for%Z’%in%dilepton%(LFC)%and%(LFV)% (in!e µ !decays)! ATLASFCONFF2015F072' F Main'background'DY'is'taken'from'MC' F Top'and'diboson'extrapolated'at'very'high'masses'using'a'funcDonal'form' F Background'from'MC'except'for'MJ'in'dielectron'uses'Matrix'method'(based'on'electron'ID)' e µ ! ee% µµ µµ ! Highest'diFelectron' Highest'diFmuon'mass' Highest'e µ 'mass'event' mass'event'at'1.8'TeV'' event'at'1.4'TeV'' at'2.1'TeV'' 95%'CL'Limit'on'SSM' No'Excess'found'!' LFV'Z’'at'3.0'TeV' (2.5'TeV' 95%'CL'Limit'on'SSM'Z’'at'3.4'TeV' (2.9'TeV'from'RunF1)' 39' from'RunF1)'
C M S Search for Diphoton resonances m γγ =745 GeV
C M S Search for Diphoton resonances • Status Moriond 2016 • Improved calibration yields 10% greater sensitivity • Fit background directly to the data using parameterization: • March 2016 f ( m γγ ) = m a + b log m γγ γγ Diphoton spectrum at 3.8 Tesla (13 TeV) -1 -1 CMS Preliminary CMS Preliminary 2.7 fb (13 TeV, 3.8T) 2.7 fb (13 TeV, 3.8T) Events / ( 20 GeV ) Events / ( 20 GeV ) EBEB EBEE Barrel-Endcap Barrel-Barrel 2 Data Data 10 Fit model Fit model 2 10 1 1 ± σ ± σ 2 2 ± σ ± σ 10 10 1 1 stat stat 2 2 σ σ (data-fit)/ (data-fit)/ 0 0 -2 -2 400 600 800 1000 1200 1400 1600 400 600 800 1000 1200 1400 1600 m (GeV) m (GeV) γ γ γ γ
C M S include data at B=0 • Without the magnetic field, we need new algorithms for vertex selection and photon identification • Correct vertex assignment is ~60% at 0T (~90% at 3.8T) • Comparable photon e ffi ciency: 85% (90%) at 0T (3.8T) per γ in barrel Diphoton spectrum at 0 Tesla (13 TeV) -1 -1 CMS Preliminary CMS Preliminary 0.6 fb (13 TeV, 0T) 0.6 fb (13 TeV, 0T) Events / ( 20 GeV ) Events / ( 20 GeV ) 2 10 EBEB EBEE Barrel-Endcap Barrel-Barrel Data Data 10 Fit model Fit model 1 1 ± σ ± σ 2 2 ± σ ± σ 10 1 1 stat stat 2 2 σ σ (data-fit)/ (data-fit)/ 0 0 -2 -2 400 600 800 1000 1200 1400 1600 400 600 800 1000 1200 1400 1600 m (GeV) m (GeV) γ γ γ γ
D IPHOTON R ESONANCES C M S [EXO-16-018] • Without the magnetic field, we need new algorithms for vertex selection and photon identification • Correct vertex assignment is ~60% at 0T (~90% at 3.8T) • Comparable photon e ffi ciency: 85% (90%) at 0T (3.8T) per γ in barrel Diphoton spectrum at 0 Tesla (13 TeV) -1 -1 CMS Preliminary CMS Preliminary 0.6 fb (13 TeV, 0T) 0.6 fb (13 TeV, 0T) Events / ( 20 GeV ) Events / ( 20 GeV ) 2 10 EBEB EBEE Barrel-Endcap Barrel-Barrel Data Data 10 Fit model Fit model 1 1 ± σ ± σ 2 2 ± σ ± σ 10 1 1 stat stat 2 2 σ σ (data-fit)/ (data-fit)/ 0 0 -2 -2 400 600 800 1000 1200 1400 1600 400 600 800 1000 1200 1400 1600 m (GeV) m (GeV) γ γ γ γ New Physics with light SM particles at CMS – J PC – Rutgers University – Sunday, March 20 th , 2016 8
D IPHOTON R ESONANCES C M S [EXO-16-018] • Combined 8 TeV + 13 TeV results • Largest excess is observed for 750 GeV, spin-0, narrow width • local significance of 3.4 σ , 1.6 σ after look-elsewhere e ff ect CMS Preliminary -1 -1 CMS Preliminary -1 -1 3.3 fb (13 TeV) + 19.7 fb (8 TeV) 3.3 fb (13 TeV) + 19.7 fb (8 TeV) ) (fb) 0 p Γ -2 = 1.4 10 J=0 × 12 m 1 σ γ Expected limit γ -1 → 10 1 ± σ 10 S 2 → ± σ 2 σ (pp Observed limit 8 combined p-values σ -2 combined limits for 10 95% C.L. limit for 8 + 13 TeV 6 8 + 13 TeV Γ -2 = 1.4 10 J=0 × m 3 σ 4 -3 10 Combined 8TeV 2 13TeV -4 0 10 3 3 3 2 3 3 3 2 5 10 10 2 10 3 10 5 10 10 2 10 3 10 × × × × × × m (GeV) m (GeV) S S • Dec ’15 result: largest excess at 760 GeV for Γ /M=1.4x10 -2 • local significance of ~3 σ , <1.7 σ after look-elsewhere e ff ect New Physics with light SM particles at CMS – J PC – Rutgers University – Sunday, March 20 th , 2016 10
A T L A Di-photons: search for spin-0 resonance S ATLAS-CONF-2016-xxx Selection optimised for Higgs-like signal: - two Photons (tight identification) - photons required to be isolated - Photon transverse energies: E T ( γ 1 ) > 0.4 m γγ E T ( γ 2 ) > 0.3 m γγ (effectively depletes forward regions) Background modelled using fit to functional form Jan Stark for the ATLAS collaboration Moriond QCD -- March 19-26, 2016 10
A T L A Di-photons: search for spin-0 resonance S ATLAS-CONF-2016-xxx Perform 2D p 0 scan (as function of mass and width of the hypothetical resonance). Largest deviation from background-only hypothesis: Report limits on fiducial cross section near 750 GeV as a function of mass hypothesis, width 45 GeV (i.e. 6%) for several width hypotheses. Local significance: 3.9 σ Example shown here: width of 6% Global significance: 2.0 σ Jan Stark for the ATLAS collaboration Moriond QCD -- March 19-26, 2016 11
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