MotivationsHQ @LHCALICE Open Flavours ConclusionsQuarkoniaElectroWeak 1 ALICE potential for Heavy Flavour Physics Gines MARTINEZ-GARCIA for the ALICE collaboration

1Motivations HQ @LHC ALICE Open Flavours ConclusionsQuarkoniaElectroWeak

ALICE potential for Heavy Flavour

PhysicsGines MARTINEZ-GARCIA

for the ALICE collaborationSubatech, Nantes, France


Physics Motivations

• Probing and characterizing the quark gluon plasma (QGP) in Heavy-Ion collisions;

• Energy loss of Heavy Quarks (HQ) in hot and high density medium formed in AA central collisions: quark coupling and dead-cone effect;

• Brownian motion and coalescence of low pT HQ in the QGP;

• Dissociation (and regeneration) of quarkonia in hot QGP;

• Heavy flavour physics in pp collisions: small x physics, pQCD, HQ fragmentation functions, gluon shadowing, Quarkonia production mechanism;

Motivations


Heavy Quarks in HIC at LHC

• Small xBj (10-3 –10-5);

• Q ~ 0.04 –0.15 fm/c;

• Q QGP <<Q;

• Shadowing / Saturation;

• HQ energy loss in QGP;

• HQ thermalization (low pT);

L.O.

SPSPbP

bCent

RHIC

AuAu

Cent

LHCpp

LHC

pPb

LHCPbPb

Cent

Ncc/evt

0.2 10 0.2 1 115

Nbb/evt

- 0.05 0.007

0.03

5HQ @LHC


Charmonia in HIC at LHC

PLB571 36 (2003)

• Melting of ’ and at SPS and RHIC, and melting of J/ at LHC?

• Magic cancellation between J/ suppression and J/ regeneration? 22 (39)% of J/ (’) from open beauty meson

decays.

SPS RHIC LHC

PLB637 75 (2006) J/ melting

J/ regeneration

HQ @LHC


Bottomonia in HIC at LHC

(2S) (1S)

(3S)b(1P)b(2P)

SPS RHIC LHC

PRD64,094015

• First measurement of Bottomonia.

• Regeneration is expected to be small at LHC.

(1S) melts only at LHC.

(2S)/(1S) as a function of centrality and pT.

m(3S-2S) = 332 MeV/c2

45 (30)% of feed-down from higher resonances for (1S) ((2S))

CUSB Detector(Cornell)

HQ @LHC


ALICE Capabilities

• ALICE combines electronic, muonic and hadronic channels;

• ALICE covers down to pT ~ 0 for quarkonia and open charm;

• ALICE covers central (||<0.9) and forward (-4.0<<-2.5) regions;

• High precision vertexing in the central barrel;

ALICE


Physics Analysis

• Hadronic decays:– D0K-, D+-K-+, DsK K*, Ds , …

• Leptonic decays:– Single lepton analysis:

– Open charm, open beauty, electro-weak bosons;

– Invariant mass analysis of lepton pairs: – BB, DD, BDsame, J/, ’, family, B J/ +

anything;– Multi-lepton analysis :

– BB J/ ;ALICE


D0 K-+ channel• High precision

vertexing, better than 100 m (ITS);

• High precision tracking (ITS+TPC);

• K and/or identification (TOF).

107 central

PbPb

1<pT<2 GeV/c

109 pp108 pPb107 PbPb

D K

Open Flavours

F. ANTINORI, A. DAINESE et al.


D+- K-++ channel

Open Flavours

QM06 Poster: E. BRUNA, F. PRINO et al.• Building K triplets from K pairs (as in D0 analysis);

• Secondary vertex quality: <180m, pointing angle: >0.995 and dist to primary vertex: >1900 m;

PbPb central Significance

for dNch/dy=6000 ~ 40 for dNch/dy=2000 ~ 90

Scaled to 107central PbPb


Open Beauty from single e• Electron Identification

(TRD+TPC);• High precision

vertexing (ITS);• Subtraction of the open

charm contribution. 107 central

PbPb

Open Flavours

F. ANTINORI, M. LUNARDON, R. TURRISI et al.


Open Beauty from and

BB

low mass

high mass

BDsame

5% central

PbPb

Single Muons

QM06 Poster: N. BASTID, Ph. CROCHET, R. GUERNANE et al.

Open Flavours


Energy Loss PhysicsCharm Production:

Quark versus gluon Energy Loss

Lower quark coupling

Beauty production:Mass dependence of Energy

LossDead cone effect

Open Flavours

ALICE PPR Vol.2. J. Phys. G: Nucl. Part. Phys. 32 1295


Quarkonia in ALICE

Quarkonia

J/

||<0.9

||<0.9

-4.0<<-2.5

-4.0<<2.5

J/

Di-electronchannel

Di-muonchannel

Until pT = 0


Quarkonia in the electron channel

• Electron Identification (TRD+TPC);

• Tracking : ITS+TPC+TRD;• 2x108 central PbPb events (no

e-trigger).

QM06 Poster: W. SOMMER, C. BLUME et al.

Quarkonia

10% central PbPb dNch/dy = 3000

13x104 J/pT=0-10 GeV/c

900 (1S)


Quarkonia in the muon channel

Quarkonia

• (1S) & (2S) : 0-8 GeV/c• J/ high statistics: 0-20 GeV/c• ’ poor significance • (3S) ok, but 2-3 run needed.

Yields for baseline

State

S[103

]B[103

]S/B S/

(S+B)1/2

J/ 130 680 0.20

150

’ 3.7 300 0.01

6.7

(1S)

1.3 0.8 1.7 29

(2S)

0.35 0.54 0.65

12

(3S)

0.20 0.42 0.48

8.1

PbPb cent, 0 fm<b<3 fmF. GUERIN, S. GRIGORYAN et al.


J/ (polarization) in pp

Quarkonia

R.. ARNALDI, D. STOCCO, E. SCOMPARIN, E. VERCELLIN et al.

p+p at 14 TeV

Nominal run 3x106 J/ ()pT 0-20 GeV/c

θ cos α 1cosθ ddσ2

>0 Transverse =0<0 Longitudinal

Possible with >50000 J/ ;Error below 10%; Bgk contribution small;Systematics in the J/ acceptance due to polarization ignorance bellow 10%.


Suppression Scenarii

Quarkonia

• Suppression-1 Tc =270 MeV D/Tc=1.7 for J/ D/Tc= 4.0 for .

• Suppression-2 Tc=190 MeV D/Tc=1.21 for J/ D/Tc= 2.9 for .PRC72 034906(2005)

Hep-ph/0507084(2005)

Good sensitivity J/, (1S) & (2S)

Ph. CROCHET, F, GUERIN, R. GUERNANE, S. GRIGORYAN et al.


Electroweak Boson Detection

ElectroWeak

Z. CONESA, L. APHECETCHE, Ch. FINCK and G. MARTINEZ

• Well known from SM (better than 10%);

• In principle no-interaction with QGP;

• Non explored region: • (M, x) = (80-90 GeV/c2, 10-3 -

10-4); • Luminosity and detector

efficiency cross-check;• Reference of quark (b) energy

loss;

b W

PbPb MB 14400 muons from

W

N+/N ~ 0.4

Di-muons from Z0 240 Z0 in MB

PbPb2400 Z0 in MB

ArAr


Conclusions

• Heavy Flavour production will be measured by ALICE in A+A collisions at LHC energies;

• Exclusive open charm (D0, D+) combined to single-lepton and di-lepton continuum measurements of beauty;

• Huge statistics on charmonia: v2, polarization;– Regeneration: Centrality and pT dependance

• Bottomonia measurement: (2S)/(1S);• Electro-weak boson can be measured in AA:

reference for beauty energy loss;• Ds, c, J/ from B, multi-muon events, etc. have not

been addressed in this talk but should be accessible with ALICE.

Conclusions


Acknowledgements

Special thanks to R. Arnaldi, F. Antinori, L. Aphecetche, N. Bastid, Ch. Blume, E. Bruna, Z. Conesa del Valle, Ph. Crochet, A. Dainese, Ch. Finck, S. Grigoryan, F. Guerin, M. Lunardon, F. Prino, K. Safarik,

E. Scomparin, R. Turrisi, J. Schukraft, W. Sommer, D. Stocco and E. Vercellin for fruitful discussions and the preparation of this talk.

Caminante, son tus huellas el camino, y nada mas;

caminante no hay camino, se hace el camino al andar

Antonio Machado (H. S. QM2002, Nantes)

ALICE will begin to walk next year!

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MotivationsHQ @LHCALICE Open Flavours ConclusionsQuarkoniaElectroWeak 1 ALICE potential for Heavy Flavour Physics Gines MARTINEZ-GARCIA for the ALICE collaboration