lhc status and plan
DESCRIPTION
LHC status and plan. Osamu Jinnouchi (Tokyo Institute of Technology) Annual meeting for ILC detectors 2011/03/09-11. contents. Brief overview of the ATLAS and 2010 LHC run Skip the SM measurements (sorry!) Higgs searches in 2010 and future SUSY searches in 2010 and future - PowerPoint PPT PresentationTRANSCRIPT
LHC status and plan
Osamu Jinnouchi(Tokyo Institute of Technology)
Annual meeting for ILC detectors
2011/03/09-11
contents
• Brief overview of the ATLAS and 2010 LHC run
• Skip the SM measurements (sorry!)
• Higgs searches in 2010 and future
• SUSY searches in 2010 and future
• Upgrade plan of LHC/ATLAS
2011/3/9 JINNOUCHI LHC/ATLAS 2
N.B. my talk is heavily biased to ATLAS results
Very short introductionShort history of LHC pp runs:
•2009.11.23 the first collision @ 900GeV
•2009.12.14 collision at 2.36TeV (energy frontier)
•2010.03.30 started 7.0TeV run it lasted until the end of 2010 Oct.
•integrated L=45 pb-1 recorded by ATLAS
•established peak L=2x1032cm-2s-1 (2x 2010 target luminosity)
ATLAS status
•all systems >97% channels operational (LAr: due to the noise bursts and HV trips partially recovered offline)
•good quality data > 94%
Immediate future plan:
•re-start up the 7.0TeV run in March 2011 (last week)
•in 2012, continue the operation and possibility of 8.0TeV run
•long planned shutdown after 2013preparing for the higher energy (13-14TeV)
2011/3/9 JINNOUCHI LHC/ATLAS 3% of good quality data
initial target
ATLAS detector performance in 2010• Inner detector
• momentum scale known to 1% level (<100GeV)
• reconstruction eff > 99% (muons > 20GeV)
• material distribution known better than 10% (goal is 5%)
• EM Calorimeter
• scale uniformity ~2% in eta, <0.7% in phi (goal is < 1%)
• energy scale known to < 1% (goal is 0.1%)
• electron ID efficiency known with ~1% precision
• HAD Calorimeter
• Jet energy scale uncertainty 4~5% (goal is 1%)
• missing Et : good MC/data agreement no tail from instrumental origin after calibration with 15M minbias
• MUONS
• momentum scale known to 1%
• momentum resolution known to rel. 10%
• reconstruction eff known to 1-2% (goal is 1%)
• Trigger / Data GRID transfer
• Luminosity 2010 (Van der Meer scan)
• final uncertainty 3.2% (most of the papers used the previous estimation 11%)
2011/3/9 JINNOUCHI LHC/ATLAS 4
Rate (2010/ design)Bunch crossing: 1MHz/40MHzLevel-1: 20kHz / 75kHzLevel-2: 3.5kHz / 2kHzEF: 300Hz / 200HzGRID: 1-4GB/s / 2GB/s
still room for improvements toward ultimate precisionbut pretty good for a first year performance
Higgs Searches and Prospects
(SM/MSSM)
2011/3/9 JINNOUCHI LHC/ATLAS 5
Higgs search channels at LHC• Two main production processes
• Gluon fusion (GGF)
• dominates by a factor of 10
• Vector boson fusion (VBF)
• characteristic signature(two forward tagging jets & rapidity)
• Main decay channels
• HWW
• dominant at intermediate region and in high mass region
• HZZ
• clean signal in 4-lep final state
• H• low BR, important in low mass region
• Hbb
• high BR, large QCD background
• H• important in low mass region, important
channel for MSSM higgs
2011/3/9 JINNOUCHI LHC/ATLAS 6
Higgs search in 2010 ATLAS data
The analyses and approval processes on going for 36pb-1
: highest/fastest sensitivity, exclusion result approved in ATLAS and shown today
: background estimation approved shown today
rest of the channels under the approval processes
(please wait for the JPS or other meetings)
: exclusion result, coming soon
: coming soon
: a bit later
: a bit later
• : coming soon
2011/3/9 JINNOUCHI LHC/ATLAS 7
SM
Hig
gs s
earc
h
MS
SM
Hig
gs
• common requirements• two opposite charge leptons (ee//e)
1st > 20GeV, 2nd >15GeV
• Mll > 15GeV, |Mll-MZ|>10GeV (ee/)
• missing ET> 30GeV
• separate search into 0,1,2 jet bins (>25GeV)(different productions, bkgs differ)
• channel specific selections
• 0-jet
• pT(ll)>30GeV (Drell-Yan suppression)
• 1-jet, 2-jet
• b-jet veto (top suppression)
• vector PT sum< 30GeV (soft gluon radiation suppression)
• |m-mZ|>25GeV(Z veto)
• 2-jet • VBF cuts
2011/3/9 JINNOUCHI LHC/ATLAS 8
0-jet 1-jet 2jet
Jet multiplicity
H+0j
H+1j
[ATLAS-CONF-2011-005]
2011/3/9 JINNOUCHI LHC/ATLAS 9
• exclusion limits from this channel
• 95% CL exclusion limit in multiples of the SM cross section, using Profile Likelihood method with a Power Constrained Limit (PCL) for the 35pb-1 2010 data
• ATLAS excludes at 95% CL SM-like Higgs boson with a production cross section of 1.2 x SM (observed), 2.4 x SM (expected) at MH=160GeV
This is the only higgs exclusion limit plot with data, I can show you today
with the first year of 35pb-1data, we already got very close to the Tevatron limit
This is the only higgs exclusion limit plot with data, I can show you today
with the first year of 35pb-1data, we already got very close to the Tevatron limit
[ATLAS-CONF-2011-005]
• Backgrounds
• Irreducible (qq,qq, qgq)
• reducible
• di-jet, -jet : jet fake
• DY Zee: e fake
• Data driven bkg estimation
• signal region: two photons pass isolation + tight photon selection
• double sideband method to extract the compositions of the bkg samples
• data-driven estimate of , j, jj events in the signal region
• Drell-Yan: e fake rate estimate
2011/3/9 JINNOUCHI LHC/ATLAS 10
Isolation for 2nd
ETisol[GeV]
ETisol[GeV]
Isolation for 1st
photon IDpass
photon IDfail
photon IDpass
photon IDfail
m distribution for the signal region
yellow band = (NLO) norm + (j+jj) data driven
[ATLAS-CONF-2011-004] net samples: event with two objects passed loose photon ID
new projected sensitivity at 1fb-1
• uses observed diphoton distribution, rescaled to 2011 luminosity (1fb-1)
• this channel can exclude 3.2-4.2 x SM for range MH=110-140GeV
• dashed line : degraded photon energy resolution (pessimistic assumption)
• similar results to previous estimation (pure simulation)
• exclusion sensitivity with 37pb-1 is about to be released
2011/3/9 JINNOUCHI LHC/ATLAS 11
[ATLAS-CONF-2011-004][ATLAS-PUB-2010-009]
7TeV 1fb-1
SM Higgs sensitivity in 2011 and beyond
2011/3/9 JINNOUCHI LHC/ATLAS 12
• with 1fb-1 of data at 7TeV, ATLAS expects median 95% CL exclusion over the range 130-460GeV
• challenge is at low mass (require 4(3)fb-1with 7(8)TeV to cover down to LEP limit, which might be possible by the end of 2012)
• with integrated luminosity 5-10 fb-1, ATLAS will move towards discovery over a wide mass range
expected limit in 2011with basic scenario (1fb-1)
[ATLAS-PUB-2011-001]
discovery reach
SUSY Searches and Prospects
2011/3/9 JINNOUCHI LHC/ATLAS 13
Expected SUSY signatures at LHC
• R-parity conserving models
• high cross sections for gluinos/squarks production
• high-pT multi jets (and leptons) from cascade decays
• stable LSP
• large missing Et
• no mass peak excess in the tail of the Meff distributionaccurate understanding of detector and bkg essential
• other varieties of models are also under exploit (not shown today)
• R-parity violation models (kink inside ID)
• more exotic signatures (NLSP decay in detector, slow heavy ionizing particles, R-hadrons, sparticle stop in the calorimeter, etc)
• Two 2010 results “OUT” from ATLAS
• 0 lepton + multi(2,3,more)-jets + MET (arXiv:1102.5290)
• squark→q+LSP, gluino→q+squark+LSP
• QCD bkg control is critical
• 1 lepton + multi(2,3,more)-jets + MET(arXive:1102.2357)
• cascade includes electroweak decays
• dominant bkg: ttbar, W, MC shape + normalization from data
2011/3/9 JINNOUCHI LHC/ATLAS 14
0 lepton analysis
• require exactly 0 lepton (pT>10GeV)
• need to suppress QCD bkg: tight cut adopted
• 1st jet > 120GeV
• 2nd (+3rd ) jets >40GeV
• missing ET>100GeV
• dominant bkg’s: W+jets, Z()+jets
• 4 signal regions defined (target heavy/light qq, gg, gq) to achieve maximum reach in msq-mgl plane
• optimized the cut to general MSSM assumption (massless neutralino)
2011/3/9 JINNOUCHI LHC/ATLAS 15
4 signal regions
1 lepton analysis
• require exactly 1 electron or 1 muon (pT>20GeV)
• 1st jet >60GeV
• 2nd & 3rd jets >30GeV
• further requirements
• Missing ET>125GeV
• MT(lep,EtMiss) > 100GeV
• Meff > 500GeV
• Backgrounds
• easier handle on QCD
• top(single, pair), W +jets dominant
• MC based estimate with normalization to a control region
2011/3/9 JINNOUCHI LHC/ATLAS 16
afte
r le
pton
+je
ts c
ut
results in table
2011/3/9 JINNOUCHI LHC/ATLAS 17
0 lepton
No excess observedprofile likelihood method to compute 95% CL upper limitnon-SM cross sections [pb] A: 1.3 B: 0.35 C: 1.1 D: 0.11
1 lepton
No excess observedprofile likelihood method to compute 95% CL upper limitelectron: 0.065 [pb] (2.2 events) muon: 0.073 [pb] (2.5 events)
interpretation in mSUGRA/CMSSM framework
• not believing in mSUGRA, but it serves as the common ground for comparison across (current/previous) experiments and theories
• equal squak and gluino masses, below 775/700 GeV are excluded with 95% CL for 0/1-lepton mode
• exceed results from the previous (and CMS) experiments
2011/3/9 JINNOUCHI LHC/ATLAS 18
0-lepton analysis
1-lepton analysis
SUSY discovery reach in 2011 and beyond
• empirical rough estimate of the SUSY 5s discovery reach in different and follows
2011/3/9 JINNOUCHI LHC/ATLAS 19
( )
• baseline scenario is 7TeV 1fb-1 in 2011, but 2-3 fb-1 is possible reach (Chamonix 2011)
30.9
???
possible choice in 2012 ??
??
???
ATLAS/CMS excludedATLAS/CMS excluded
Other Exotics Searches
2011/3/9 JINNOUCHI LHC/ATLAS 20
quick glance for search comparisons
2011/3/9 JINNOUCHI LHC/ATLAS 21
ATLAS TEVATRON CMS
excited Q M>1.26TeV (PRL 105, 16180 (2010))dijet mass resonance search (315nb-1)36pb-1 result coming soon
M>0.87TeV M>1.58TeV2.9pb-1
Contact Interaction
L>3.4TeV (PLB694(2011)327)dijet angular distribution (3.1pb-1)36pb-1 result coming soon
L>2.84-3.06TeV L>5.6TeV36pb-1
quantumBlack Holes
36pb-1 result coming soon NONE various limits(35pb-1)
W’ 36pb-1 result coming soon M>1120GeV M>1580GeV(36pb-1)
Z’ 36pb-1 result coming soon M>1071GeV M>1140GeV(35pb-1)
UED 1/R> 728 GeV (arXiv:1012.4272)(3.1pb-1)diphoton + MET
1/R> 477GeV NONE
ATLAS updates (soon) will be better or similar results to CMSexceeded Tevatron limit in the first year, no surprise yet so far
LHC/ATLAS Upgrade Plan
2011/3/9 JINNOUCHI LHC/ATLAS 22
the 10 year technical plan(based on schedule @12.2010)
2011/3/9 JINNOUCHI LHC/ATLAS 23
7-8TeV: 4-8 fb-17-8TeV: 4-8 fb-1
shutdown in 2016 most likely to be delayed (nodecision yet)
13-14TeV:13-14TeV:
13-14TeV: up to 300 fb-113-14TeV: up to 300 fb-1HL-LHCHL-LHC
subject to change by various conditions (physics, machine)
???shutdown (fixed)
3000fb-1 by 2030
2011Jan Chamonix
General idea towards HL-LHC
• [2011-2012] 1st physics results (Higgs 3 coverage, SUSY < 1TeV) will be accomplished with 7TeV, 5-10fb-1
• [by 2020] will cover LHC design goal with 14TeV, a few 100 fb-1
• [post 2020] further pursue: HL-LHC for 3000fb-1
• new physics search: further extension to higher mass scale
• high precision measurements (Higgs couplings, SUSY masses)complementary to ILC
• In any regards, the upgrade is inevitable in both LHC and Detectors
• development for more intense beams
• detectors have to survive the high lumi, and keep (or improve)the performance
• minimize the impact to physics program & maximize the outcome
preparation for upgrade is important whatever the run schedule would be
2011/3/9 JINNOUCHI LHC/ATLAS 24
LHC upgrade for higher intensity[0] LHC injection chain (x2-3 lumi)
[1] new high gradient / large aperture quadruples
• Bpeak = 13-15T, * =55cm 23cm (x2.4lumi w/ CC)
• Nb-Ti (current LHC) would not be safice
• US-LARP (LHC Accelerator Research Program) engaged to demonstration prototype with Nb3Sn by 2013
• KEK-CERN develops Nb3Al technology choice ~2014
[2] RF Crab Cavities
• kick beam sideway to bring the collision head-on
• not yet been validated for LHC (KEKB is the only working proof on earth)
2011/3/9 JINNOUCHI LHC/ATLAS 25
[1]
curr
ent
LHC
new quads
CC
[2]
In both cases, Japan’s Accelerator technologies plays crucial roles: Japan-EU-US design teamhad been established
In both cases, Japan’s Accelerator technologies plays crucial roles: Japan-EU-US design teamhad been established
ATLAS detector upgrade plan
• Major items towards HL-LHC
• ID: replace full ID with silicon only tracker (pixel + short strips + long strips)
• CAL: Endcap electronics, Forward CAL may require upgradesthree upgrade scenarios/development on going
• MUON: replacement of forward tracking MDT
• TRIGGER: upgrade for L1Cal and L1Muon, and combination (e.g. non-Isolated muon)
2011/3/9 JINNOUCHI LHC/ATLAS 26
Commitments/Contributions from ATLAS-JAPAN group
Summary
• LHC 2010 run was successful
• (not shown in detail though) SM measurements/ detector performance were super and more than expected
with 36pb-1
• Higgs: the exclusion limits came close to Tevatron
• SUSY & Exotics : significantly exceeded Tevatron limits
• fruitful results (hopefully with surprises) are promising in 2011-2012 run
• we are getting maximum speed for an efficient genuine collaboration works
• upgrade works for HL-LHC (2020 onward) is under waycomplementary and (good) competitive to ILC
2011/3/9 JINNOUCHI LHC/ATLAS 27