D. Di BariD. Di Bari Alice Offline Meeting 23/2/05

• Pb-Pb central (dN/dY=6000)• 50 tracks/ m2

Colour = separation power /K and K/p

pK

RICH performance in ALICERICH performance in ALICE

p/K separation of p/K separation of 33 @ 5 GeV/c @ 5 GeV/cin Pb-Pb a 5.5TeVin Pb-Pb a 5.5TeV(dn/dY=6000) (dn/dY=6000)

#photoel. Per =1→ 20

D. Di BariD. Di Bari Alice Offline Meeting 23/2/05

Antiproton/proton 20 Hijing eventsPb-Pb fully reconstructed

2 (anti)protons embedded in each module

D. Di BariD. Di Bari Alice Offline Meeting 23/2/05

D. Di BariD. Di Bari Alice Offline Meeting 23/2/05

Combined PID: TOF and RICH correlation

D. Di BariD. Di Bari Alice Offline Meeting 23/2/05

Determination of v2 ad Determination of v2 ad high phigh pTT

Eventi minimum bias Au-Au in the STAR experiment

September 2004

D. Di BariD. Di Bari Alice Offline Meeting 23/2/05

Production of particles vs Production of particles vs PPT T

pT

pQCDHydro

2-3 GeV/c ~8-10 GeV/c ?

SoftSoft FragmentationFragmentationand quenchingand quenching

of jets of jets

0

Meccanism atMeccanism at

“intermediate” p“intermediate” pTT??

SOFT & quenchingSOFT & quenching

CoalescenceCoalescence(mini-jet parton + QGP (mini-jet parton + QGP

parton)parton)

Sp

ectt

ra,

rati

os,

Rcp

What we know for sure…

???

Recent results from RHIC show the need to extend the pT range of the PID expecially for protons

Cherenkov counter with Cherenkov counter with aerogel in ALICEaerogel in ALICE

UNAM, INFN Bari, INR UNAM, INFN Bari, INR

(ALICE VHMPID group)(ALICE VHMPID group)

D. Di BariD. Di Bari Alice Offline Meeting 23/2/05

Layout of the counterLayout of the counter

PM

n = 1.008

Momentum (GeV/c)Proton identification up to p = 8-12 GeV/c

D. Di BariD. Di Bari Alice Offline Meeting 23/2/05

D. Di BariD. Di Bari Alice Offline Meeting 23/2/05

array of 7 modules (each ~1.5 x 1.7 m2)

HMPID layout in ALICEHMPID layout in ALICE