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![Page 1: French-Spanish collaboration within the ALICE experiment Ginés Martínez García Subatech, Nantes, France Néstor Armesto Universidade de Santiago de Compostela,](https://reader036.fdocuments.net/reader036/viewer/2022070410/56649ec65503460f94bd2216/html5/thumbnails/1.jpg)
French-Spanish collaboration within the ALICE experiment
Ginés Martínez GarcíaSubatech, Nantes, France
Néstor ArmestoUniversidade de Santiago de Compostela, Spain
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Preface• Experiment at the LHC;• Spanish teams have joined ALICE
recently:– Collaboration meeting in Bologna in 2006;
• Many topics of common interest have been identified;
• Spanish contribution reminds modest: 1 permanent physicist at CIEMAT and 3 physicists of the theoretical group from Santiago de Compostela.
Meeting in2p3 - mcinn, jan 12th 2009, Madrid, Spain 2
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Phases of matterPhases of matter
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Goal of the HI program Understanding of hadron mass in the
Standard Model - confinement - through the creation of extended regions with large energy densities (parametric estimates: ~4-40 GeV/fm3 for V~1000 fm3).
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Complementary to other LHC high-energy studies - potential for discovering new phenomena at high energy density - using the same accelerator and detectors.
Complementary to other LHC high-energy studies - potential for discovering new phenomena at high energy density - using the same accelerator and detectors.
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LHC running conditions @ P2
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System sNN1/2(TeV) L0(cm-2s-1) <L>/L0 Run time (s yr-1) (b) Statistics
pp 14 <1031 107 0.07 7X1012
PbPb 5.5 1027 ~50% 106 7.7 4X109
Nominal conditionsNominal conditions
• Other Heavy-Ion like systems: pp 5.5 TeV, pPb, lighter ions (O, Ar, Kr, Sn).
QGP
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A Large heavy Ion Collider Experiment
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LoI LHCC-93-16 (March 1st 1993), TP LHCC 95-71, TDRs (1997-2008), PPRs JoP G30 11 (2004) & JoP G32 10 (2006), 1st Physics publication expected in 2009.LoI LHCC-93-16 (March 1st 1993), TP LHCC 95-71, TDRs (1997-2008), PPRs JoP G30 11 (2004) & JoP G32 10 (2006), 1st Physics publication expected in 2009.
y
z
x
Side A
Side C
Inside LHC
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ALICE collaboration
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• ~ 1000 members (63% from CERN member states);
• 30 countries;• 100 laboratories;• France M&O-2008
member list around 11%;
• Spain/Cuba M&O-2008 member list around 1%.
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Topics of common interest
• Hard probes:– Quarkonia and open heavy flavours;
– High-pT particles and jets;
• Alice computing grid:– Tiers-2 developments;
• Future ALICE detector upgrades.
Meeting in2p3 - mcinn, jan 12th 2009, Madrid, Spain 8
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Quarkonia Physics
• Color screening of the heavy quark potential;• New energy domain at LHC: large number of
HQ pairs;• Measuring upsilon resonances.
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Quarkonia in ALICE
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• Heavy quarkonia states, heavy quark production in the muon & electron channel;
• Charmonia from pT=0 GeV/c;
• Separation of Upsilon states;• Acceptance ||<0.9 & -2.5<<-
4.0;• Potential complications:
• Cold nuclear matter effects;• Feed-down from higher
resonances;• B-hadron decays.
ALICE muon Spectrometer ALICE muon Spectrometer
Measurement of c production in proton-proton collisions via
its radiative decay +J/;Item developed by the
CIEMAT group within the PWG3 group.
Measurement of c production in proton-proton collisions via
its radiative decay +J/;Item developed by the
CIEMAT group within the PWG3 group.
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c Analysisc (M=3.5GeV)
J/(M=3.1 GeV) + l+
+l-• Photon detected via
external conversion in the ALICE TPC:
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P. Ladrón de Guevara et al., Hard Probes 2008arXiv:08:11.1592v1 [hep-ex]
P. Ladrón de Guevara et al., Hard Probes 2008arXiv:08:11.1592v1 [hep-ex]
Work in progress: Trigger efficiency, extrapolation to AA.Collaboration with A. Marin, GSI
ee
l
lc
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Energy loss of Heavy Quarks• Suppression of high-pT
particles has been one of the golden observations at RHIC;
• Interpretation of these data based on the energy loss of quarks and gluons crossing the QGP (in which Santiago is a leading international group);
• At LHC energies, muons will provide a non-ambiguous observation of beauty quark energy loss.
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N. Armesto et al., PRD 71, 054027 (2005).N. Armesto et al., PRD 71, 054027 (2005).
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Muon distribution at the LHC
• W as a medium blind reference of the beauty Eloss in QGP.
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Decay Collision Statistics
Muonic p-p, 14 TeV 86 000
Muonic Pb-Pb, 5.5 TeV, MB 14 000
Muonic Pb-Pb, 5.5 TeV, 0-10CC
6000
Z. Conesa del Valle et al. PLB663, 202 (2008)Z. Conesa del Valle et al. PLB663, 202 (2008)
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ALICE Computing Grid• Standard
computing Model: – Tier0 (CERN), Tier1,
Tier2;
• Lower event rate, but larger event size;
• Requirements:– CPU ~ 80 MSi2K;– DISK ~ 30 PB;– MSS ~ 40 PB;
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• France: 1 Tier1 and 6 Tier2;
• Spain: 1 Tier2
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ALICE Tier2• Averaged ALICE Tier2:
– 1.7 MSI2K CPU and 270 TB disk;
• Spain (Tier2 Madrid/Trujillo):– 0.18 MSI2K CPU and 35 TB disk and 60 TB MSS.
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Potential collaboration: Development of one new Tier2; Analysis facilities.
Potential collaboration: Development of one new Tier2; Analysis facilities.
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Other collaborations • Organization of Conferences:
– Contribution of IN2P3 to Hard Probes 2008 and Hot Quarks 2008;
• European networks of I3HP2 7FP:– JetCal (Jet Physics in HIC);– ReteQuarkonii (Quarkonia Physics in HIC);
• Other French-Spanish collaborations:– Ecole Polytechnique and LPT Orsay about cold
nuclear matter effects;– LPTHE Jussieu about jets in heavy ion
collisions.Meeting in2p3 - mcinn, jan 12th 2009, Madrid, Spain 16
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Future plans• Reinforcement and extension of the
collaborations; training within EU networks;• Extension of studies of heavy quark energy
loss to charm;• Studies of jet reconstruction with the TPC+
EMCAL in the heavy ion environment;• Enlargement of the contribution to the
ALICE-GRID; • Future detector upgrades.
Meeting in2p3 - mcinn, jan 12th 2009, Madrid, Spain 17