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ALICE Performance in p+p collisions Possible HI plan at LHC Prospects of ALICE in Pb+Pb collisions ALICE upgrade plan, physics for upgrades
and timeline › Completion of EMCAL/TRD(/PHOS)› Trigger Plan› DCAL› VHMPID› ITS-vertex› FoCAL
Summary and Outlook
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ALICE demonstrated wide capabilities to measure soft & hard probes.
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πK
pΩ
J/ψ
J/ψ
Studying QGP Era (MB)2010 (official) - √sNN = 2.76 TeV Pb + Pb (4 weeks) L~1025 cm-2s-1
2011 (anticipated)-√sNN = 2.76 TeV Pb + Pb (4 weeks) L ~ few 1026 cm-2s-1
2012 (official) – Shutdown for maintenance, installation & repair2013 - √sNN = 5.5 TeV Pb + Pb, L~1027 cm-2s-1
2014 - √sNN = 5.5 TeV Pb + Pb, L~1027 cm-2s-1
Control experiments2015 – √sNN = 8.8 TeV p + Pb & Pb + p or lighter A + A2016 – Shutdown – LINAC4 /Collimation/RF & detector upgrade2017 – √sNN = 5.5 TeV lighter A + A or √sNN = 8.8TeV p+Pb/Pb+p
Detail Studying Era (rare probes)2018 – √sNN = 5.5 TeV high L Pb + Pb for hard probe physics2019 – √sNN = 5.5 TeV high L Pb + Pb for hard probe physics2020 – Shutdown – …. upgrades
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ALICE Potential in (First) Pb+Pb collisions › Collect ~1.5x107 (2010) – 108 (2011) MB events Global event properties (105 Pb+Pb events) Multiplicity, charged particle spectra, elliptic flow,
Space-time evolution (106 Pb+Pb events) identified spectra/flow, resonances, particle ratio, correlation,
high-pT, Jets and heavy favors (107 Pb+Pb events) energy loss, color screening
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Upgrade plans to enrich the physics capabilities› short(<2012)/mid(2013-2016)/long term plans(>2016)
On going upgrades:› Completion of EMCal(2010), TRD(2011-2012), (PHOS) › Di-jet Calorimeter (DCAL) (2011-2012)
Future › TPC fast readout upgrade using new gas/electronics › Very high momentum particle identification (VHMPID)› 2nd generation of vertex detectors (ITS)› Forward Calorimeter (FoCAL)› Backward Tracking vertex detectors before muon arm› DAQ/HLT Upgrade (DDL-SIU interface, new IO bus, etc)
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Timeline for the upgrades› (of course, the schedule could be changed…)
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<2012 2013 2014 2015 2016 2017 2018 2019 2020
EMCAL/TRD
DCAL
VHMPID
ITS upgrade
FOCAL
TPC
DAQ
Full installation Partial installation ready
Full installation of EMCal (2010), TRD(2011-2012)
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ITSTPC
TRD
TOFEMCAL
PHOS/DCAL
HMPID
L3 Magnet
ITSTPC
TRD
TOFEMCAL
PHOS
HMPID
L3 Magnet
Setup for 2011 Setup for 2013
Possible Trigger plan for ALICE› Minimum Bias : “V0OR” or “SPD” › Rare Trigger : Centrality trigger: SPD High pT Trigger : TRD, VHMPID Jet Trigger: EMCAL, PHOS, DCAL Electron/Quarkonia Trigger: TRD Ultra-peripheral : TOF, TRD High Level Trigger:
High multiplicity High pT particle (two particle), jets Invariant mass High pT J/psi High pT open charm
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EMCALL0 trig.
60% extension of EMCal acceptance Incorporate PHOS and DCAL modulesto produce a single, large EM calorimeter patch back-to-back with EMCAL.
› ∆η x ∆φ = 1.4 x 0.7
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Project InstitutionCatania, CERN, Franscati, Grenoble, INFN, JyväskyläNantes, Stranbourg, Tsukuba, ORNL, LBNL, Yale, Huston,LANLWuhan
PHOS
DCAL
VHMPID
Study of the parton energy loss by taking the correlation with EMCAL › γ-jets : quark jets › di-jets, π0-jets: mostly gluon jets › controllable variable: “Path length”
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M. Ploskon, QM09
Improve jet energy balance › Balance = (E1-E2)/0.5*(E1+E2)
Annual yield › Up to 100 GeV in pi0-jets and di-jets› Up to 30 GeV in γ-jets
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Qhat=0 GeV2/fm
Qhat=20Qhat=50
Eπth > 20 GeV Eπ
th > 40 GeV
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• 1 SM in Tsukuba • Infra preparation is on going.
• Beamtest of EMCAL-Tower at CERN (PS/SPS on Aug. 2011)
Assembled in Japan/Italy
Assembled in Grenoble/Nantes
Study of flavor dependence of particle production in A+A
› Energy loss for quark/gluon jets› Modification of hadronization› PID tagged jet tomography
Extension of PID capability › Upgrade based on HMPID› Installation in ~2015
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Project InstitutionCERN, Chicago, Yale, Pusan, Eotvos Univ., KFKI, INFN Bari, Puebla,ICN(Mexico), Univ. Mexico MEX
VHMPID
Focusing RICH with spherical (or parabolic) mirrors C4F10 gas radiator L=80 cm, γth~19 Photon detector baseline option:
MWPC with CsI photocathode Thick-GEM with CsI photo-converter
High pT trigger development
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~ 3 σseparation !
K π
p
cut on no. of photons16 GeV
30 GeV
x2 Improve the impact parameter resolution › x100 increase in charm sensitivity› access to charmed baryons › exclusive B decays and total B production cross section down to PT ~0
› Improve flavor tagging. Thinner/smaller beam pipe
› r=2.9cm -> 2-2.5cm, ∆r=800um -> 500-600um New pixel technology
› 6-> 7 layers, replace SDD -> SPD› Thinner (<200um + 150um)› Higher granularity (<150um x 450um)› “Hybrid active pixel detectors” or › “Monolithic active pixel detectors (MAPS/MIMOSA/LePIX)“
TPC SSD
SDD
SPD
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Forward Physics at LHC› Parton PDF in proton/nuclei at small –x
Gluon Shadowing Gluon Saturation, CGC
› Elliptic Flow in A+A › Long-Range rapidity correlation:
Ridge phenomena
Important information for the initial stage of collisions/thermalization.
› Initial state/Glasma formation Fully exploit the opportunity offered by the LHC to access the small-x region& large saturation scale by going to forward rapidity.
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arXiv:0802.0139
From K.Itakura
Some hints from RHIC for CGC› Forward hadron production in d+Au› De-correlation of recoil jets in d+Au› Suppression of away side of e-mu correlation in d+Au (mu@small-x)› Suppression of forward J/psi in d+Au
Important to measure photon/pi0from hard process at forward rapidity
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BRAHMS, NPA757(2005)1PHENIX, T. Engelmore, APS2010
(x, Q2) map covered by FoCAL Measurement items
› π0, prompt γ at η=2.5~4.5 in p+p/p+A› π0-jets or dijets in p+p/p+A› Inclusive photons/π0 (in A+A)
Stage 1 (z=3.5m, 2.5<η<4.5) in 2016 Stage 2 (4.5<η<6) in 2020.
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Project Institution CNS Tokyo, Yonsei, Kolkata, Mumbai, Jammu, Utrecht/Amsterdam, PragueJyväskylä, Copenhagen, Bergen, Oak Ridge, Nantes, Jaipur
Segmented EM (W+Si) Calorimeter › 21 layers (~21X0) of W(~3.5mm)+Si pad (~1x1cm2)› Si strip for γ/π0 separation› Fine pixel readout and digital readout (MAPS, MIMOSA)› <~300 towers in total
Simulation/R&D are on going.
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One tower config.(9cm x 9cm x ~10cm)
Size: 9x9 cm2
Thickness: 535µmPad size: 1.1x1.1 cm2
Number of pads : 64
Pi0 in p+Pb by HIJING
ALICE has a powerful potential for the study of QGP in heavy ion collisions.› Successfully commissioned and excellent performance in p+p
collisions. Ready to explore “a new QGP world”!! ALICE started working for detector upgrades to enrich
the physics capabilities.› Short term plan
Completion of TRD/EMCAL/(PHOS) Di-jet calorimeter
› Mid/Long term plan Very High Momentum Particle ID Inner Vertex Tracker Forward Calorimeter
Stay tuned the outcomes from LHC-ALICE!!
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