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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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