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HIGH challenges in LOW energy HADRON physics
G. Vesztergombi
Zimanyi SchoolBudapest, 25 November 2008
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OUTLINE
AA-Landscape-STAR plans
pp,pA-Static quarks-High pT below 20 GeV-NA61-CBM-QGP in pp-Barion versus parton propagation
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AA
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pp,pA
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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 up of protons and neutrons. Both particles are much heavier than their quark and gluon constituents, and the Standard Model of particle physics should explain this difference. We present a 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 to extrapolate to the physical point, with lattice sizes of approximately four times the inverse pion mass. Three lattice spacings are used for a continuum extrapolation. Our results completely agree with experimental observations and represent a quantitative confirmation of this aspect of the Standard Model with fully controlled
uncertainties.
Latest in LATTICE QCD
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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
qqqqs
Searches for such states started in 1966, with negativeresults till autumn 2002 [16 years after 1986 report of PDG !]
observation of a S=+1 baryon implies a new large multiplet of baryons (pentaquark is always ocompanied by its large family!)
important
Searches were for heavy and wide states
PENTA ?
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Motivation for new measurements below = 20 GeVs
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 dependencecentrality dependenceparticle type dependenceparticle correlations
Production of Upsilon (9.5 GeV) particles near the threshold.
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NA49 (CERN) results at 158FODS (IHEP) at 70 GeV
Beier (1978)
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preliminary
Pb+Pb, 0-12.7% most central
p+Pb reference
WA98 and NA49 data presented in QM'06 by Gianluca USAI's plenary talk
RA+A/p+A
CRONIN-effect removed by p+A baseline
NEW !!!
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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
CERN Greybook 2008
(Technical coordinator)
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Benchmark NA49 pp at E = 158 GeV 30 events/spill Events Energy > 3 GeV/c > 4 GeV/c > 5 GeV/c
2 106 158 100 1 0.01Estimates with the assumption 1011 proton/sec 109 interaction/sec
1 day=1014 158 5 109 5 107 5 105
Suppression 10-1 10-2 10-3
1 day=1014 90 5 108 5 105 500
20 day=2 1015 90 1010 107 104
20 day=2 1015 45 107 10 0
Suppression 10-3 10-6 10-10
For symmetric nuclei max energy 90/2 assumed
CBM Perspectives
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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
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QGP in pp?
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Részecskeszám (Van Hove)
Átla
g pT
(V
an H
ove)
Multiplicity
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Single FIRE-BALL = QGP?
A B(AB)*
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Double FIRE-BALL = Factorization?
A B
A*
B*
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BARION propagation through the NUCLEUS
A
A*
A**N
N*
N**
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HADRON PROPAGATION
Npart = 3+1 Ncoll = 3
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HADRON PROPAGATION
Npart/2 = (13+12)/2 =12.5
Ncoll = (36+28)/2 = 32
(Some diffractive binary collisions included)
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PHENIX 200 GeV
Ncoll = 1
Npart = 1
Npart =Ncoll
Au-Au
Au-Aud-Au d-Au
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Earlier Cronin-effect at higher energies: 2 -> 1 GeV/c
Pizero smaller Cronin-effect.
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