HIGH   challenges  in  LOW energy HADRON physics
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HIGH challenges in LOW energy HADRON physics. G. Vesztergombi. Zimanyi School Budapest, 25 November 2008. OUTLINE. AA Landscape STAR plans pp,pA -Static quarks -High pT below 20 GeV -NA61 -CBM -QGP in pp -Barion versus parton propagation. AA. pp,pA.

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HIGH challenges in LOW energy HADRON physics

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High challenges in low energy hadron physics

HIGH challenges in LOW energy HADRON physics

G. Vesztergombi

Zimanyi School

Budapest, 25 November 2008


High challenges in low energy hadron physics

OUTLINE

  • AA

  • Landscape

  • STAR plans

  • pp,pA

  • -Static quarks

  • -High pT below 20 GeV

  • -NA61

  • -CBM

  • -QGP in pp

  • -Barion versus parton propagation


High challenges in low energy hadron physics

AA


High challenges in low energy hadron physics

pp,pA


High challenges in low energy hadron physics

Science 21 November 2008: Vol. 322. no. 5905, pp. 1224 – 1227

Ab Initio Determination of Light Hadron Masses

S. Dürr,1 Z. Fodor,1,2,3 J. Frison,4 C. Hoelbling,2,3,4 R. Hoffmann,2 S. D. Katz,2,3 S. Krieg,2 T. Kurth,2 L. Lellouch,4 T. Lippert,2,5 K. K. Szabo,2 G. Vulvert4

More than 99% of the mass of the visible universe is made upof protons and neutrons. Both particles are much heavier thantheir quark and gluon constituents, and the Standard Model ofparticle physics should explain this difference. We presenta full ab initio calculation of the masses of protons, neutrons,and other light hadrons, using lattice quantum chromodynamics.Pion masses down to 190 mega–electron volts are used toextrapolate to the physical point, with lattice sizes of approximatelyfour times the inverse pion mass. Three lattice spacings areused for a continuum extrapolation. Our results completely agreewith experimental observations and represent a quantitativeconfirmation of this aspect of the Standard Model with fullycontrolled uncertainties.

Latest in LATTICE QCD


High challenges in low energy hadron physics

PENTA ?

All baryonic states listed in PDG can be made of 3 quarks only

* classified as octets, decuplets and singlets of flavour SU(3)

* Strangeness range from S=0 to S=-3

  • A baryonic state with S=+1 is explicitely EXOTIC

  • Cannot be made of 3 quarks

  • Minimal quark content should be , hence pentaquark

  • Must belong to higher SU(3) multiplets, e.g anti-decuplet

observation of a S=+1 baryon implies a new large multiplet of

baryons (pentaquark is always ocompanied by its large family!)

important

Searches for such states started in 1966, with negative

results till autumn 2002[16 years after 1986 report of PDG !]

Searches were for heavy and wide states


High challenges in low energy hadron physics

Motivation for new measurements below = 20 GeV

Practically no high or medium Pt data between Einc = 24 and 200 GeV

Mysterious transition around 80-90 GeV: convex versus concave spectra

Energy threshold for Jet-quenching?

Emergence of Cronin-effect in pA interactions is completely unknown

energy dependence

centrality dependence

particle type dependence

particle correlations

Production of Upsilon (9.5 GeV) particles near the threshold.


High challenges in low energy hadron physics

Beier (1978)

NA49 (CERN) results at 158

FODS (IHEP) at 70 GeV


High challenges in low energy hadron physics

Pb+Pb, 0-12.7% most central

p+Pb reference



preliminary

CRONIN-effect removed by p+A baseline

RA+A/p+A

NEW !!!

WA98 and NA49 data presented in QM'06 by Gianluca USAI's plenary talk


High challenges in low energy hadron physics

SPOKESPERSON:

Marek GAZDZICKI

SPOKESPERSON:

Gyoergy VESZTERGOMBI

GLIMOS:

Zoltan FODOR

Beam:

Approved:  

21-FEB-07

Status:

Preparation

NA61

Study of Hadron Production in Hadron-Nucleus and Nucleus-Nucleus Collisions at the CERN SPS

(Technical coordinator)

CERN Greybook 2008


High challenges in low energy hadron physics

Benchmark NA49pp at E = 158 GeV 30 events/spill

Events Energy > 3 GeV/c > 4 GeV/c > 5 GeV/c

2 106 158 100 1 0.01

Estimates with the assumption 1011 proton/sec 109 interaction/sec

1 day=1014 158 5 109 5 107 5 105

CBM Perspectives

Suppression 10-1 10-2 10-3

1 day=1014 90 5 108 5 105 500

20 day=2 1015 90 1010 107 104

Suppression 10-3 10-6 10-10

20 day=2 1015 45 107 10 0

For symmetric nuclei max energy 90/2 assumed


High challenges in low energy hadron physics

Special requirements for Y-> e+e- and high pT

Extremely high intensity - Pile-up

Segmented multi-target - Relaxed vertex precision

Straight tracks - High momentum tracks

DREAM: 109 interactions/sec


High challenges in low energy hadron physics

QGP in pp?


High challenges in low energy hadron physics

Átlag pT (Van Hove)

Multiplicity

Részecskeszám (Van Hove)


High challenges in low energy hadron physics

Single FIRE-BALL = QGP?

(AB)*

A

B


High challenges in low energy hadron physics

Double FIRE-BALL = Factorization?

B*

A

B

A*


High challenges in low energy hadron physics

BARION propagation through the NUCLEUS

A

N**

N*

A*

A**

N


High challenges in low energy hadron physics

Npart = 3+1 Ncoll = 3

HADRON PROPAGATION


High challenges in low energy hadron physics

Npart/2 = (13+12)/2 =12.5

Ncoll = (36+28)/2 = 32

HADRON PROPAGATION

(Some diffractive binary collisions included)


High challenges in low energy hadron physics

PHENIX 200 GeV

Au-Au

Ncoll = 1

d-Au

d-Au

Npart =Ncoll

Au-Au

Npart = 1


High challenges in low energy hadron physics

Earlier Cronin-effect at higher energies: 2 -> 1 GeV/c

Pizero smaller Cronin-effect.


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