1992 Predictions for RHIC with HIJING
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1 1992 Predictions for RHIC with HIJING HIJING: A MONTE CARLO MODEL FOR MULTIPLE JET PRODUCTION IN P P, P A AND A A COLLISIONS Phys.Rev.D44: ,1991 GLUON SHADOWING AND JET QUENCHING IN A + A COLLISIONS AT S**(1/2) = 200-GEV. Phys.Rev.Lett.68: ,1992 Xin-Nian Wang, Miklos Gyulassy Did we over-predict jet quenching? Sur-prize-ingly, right on for pi0 But B-B over quenched With ET,v2(B), HBT, D the plot Thickens INT 12/14/02 1
2 Nuclear Collisions in HIJING Beam jets (low pt<2 GeV) LUND/DPM pqcd mini jets (pt>2 GeV) PYTHIA nuclear geometry Glauber conservation laws Poincare Tuned to pp data GeV Nuclear Effects modeled 1. Nuclear Wavefunction: Shadow, anti-shadow, EMC Default: glue shadow = EMC quark shadow data 2. Parton energy loss: de/dx and mean free path Default: de g /dx=2 GeV/fm and =1 fm (ea INT 12/14/02 2
3 Shadowing assumed in Hijing Unknown Nuclear Physics 1 Eskola et al shadowing Huge HIJING shadow CGC Saturation may Pale in comparison at x<<0.1 INT 12/14/02 3
4 Unknown Nuclear Physics 2 1. How opaque L is the produced QGP? 2. What is the effective coupling, and infrared screening scale, 3. Energy and density dependence of jet energy loss, de/dx? GLV Thin Plasma Limit L/ λg OpacityExpansion 1+1D expanding 3 α 1 dng E E s R 2 Log π 2 R dy µ R (1 x)e xe BDMS Thick Plasma Limit Static matter E α R ρe INT 12/14/ s
5 XN Wang, MG Gluon Shadow Jet Quenching P0=2GeV INT 12/14/02 5
6 Nbinary? 2003? PHENIX 130 hch BRAHMS PRL88(02) STAR 130 Npart/2 INT 12/14/02 6
7 Jenifer Klay QM02 Low pt<1 GeV increases from E cm =130 to 200 by only ~20%! But High pt> 2 GeV increases by ~2 as per pqcd prediction! pqcd minijets INT 12/14/02 7
8 RunII: Pion Quenching at 200 AGeV R AA ( p T ) = N 1/N (d binary 2 eventsd 2 σpp N /dp AA T /dp dη dη/ σ T pp inelastic PHENIX = ) D. d Enterria QM02 SPS Cronin effect RHIC Jet Quenching PHENIX Preliminary binary scaling INT 12/14/02 8
9 HIJING prediction of 1992 coincides with AGeV Au+Au -> data! No Shadow, No Quench No Shadow, de g /dx=0.5 GeV/fm Default: Shadow, de g /dx=2.0 V.Topor Pop, MG INT 12/14/02 9
10 HIJING at 200AGeV vs Preliminary PHENIX p+p and Au+Au V.Topor Pop, K. Filimonov. INT 12/14/02 10
11 Single Hadron Tomography from SPS, RHIC, LHC Ivan Vitev and M.G, Phys.Rev.Lett. 89 (2002) 1. Cronin dominates at SPS 2. Cronin+Quench+Shadow conspire to give ~ flat suppression out to highest pt at RHIC with R~N part /N bin 3. Predicts sub N part quench, positive pt slope of R at LHC and R LHC (40)~R RHIC (40) INT 12/14/02 11
12 RHIC s high pt Baryon Surprise That nobody predicted And nobody previously observed INT 12/14/02 12
13 The charged particle LUMP V. Topor Pop et al. nucl-th/ K. Filimonov STAR,PHENIX 130AGeV - + K - + p -? de/dx=0.5 de/dx=1.0 de/dx=2.0 INT 12/14/02 13
14 J. Velkovska, DNP 2002 T. Sakaguchi QM02 (anti)proton/pion ratio Discovery of huge nuclear ( B >0) physics effect! For p T = 2 4 GeV/c ~ 1 for central Au+Au But ~ for peripheral Au+Au similar to pp INT 12/14/02 14
15 Cronin effect PRD19(79)764 s = 27.4 p π + Factor ~4 at pt~6 p π p+w 184 p+ti 48 p+be 9 p+p p T GeV INT 12/14/02 15
16 Charged Hadron R AA >> Neutral Pion R AA Preliminary s NN = 200 GeV PHENIX preliminary UA1 Reference corrected for STAR h acceptance (Limited to p T < 6 GeV/c only by p+p reference) G.Kunde,J.Klay QM02 D. d Enterria QM02 INT 12/14/02 16
17 The charged particle LUMP V. Topor Pop et al. nucl-th/ K. Filimonov STAR,PHENIX 130AGeV - + K - + p - de/dx=0.5 Baryon anomaly explains why HIJING over-predicted h ch quenching de/dx=1.0 de/dx=2.0 INT 12/14/02 17
18 Baryon Junctions q (x )U(x,x )q (x ) Meson = f f 1 = u s Baryon = Junction Λ=ε Veneziano,Rossi (78) UU U uds i'i j'j k'k i'j'k' i j k Baryon # transport via baryon junction exchange p- p dn cosh(1 - a J(0) )y = Z dy sin h(1 - a (0))Y J d max D.Kharzeev 96 S.Vance,MG 98 Also expect enhanced p T slopes for baryons from 1 a J» a R 3 Predicts hyperon enhancement INT 12/14/02 18
19 Hijing1.37 qq-qq STAR Discrepancy qq -> p INT 12/14/02 19
20 HIJING + Junction+AntiJunction vs 2.0 V. Topor-Pop, MG S.Vance, HIJING/Bbar/1.0 INT 12/14/02 20
21 Collective Flow vs Junctions Ivan Vitev, MG, PRC65(02) p π Hydro pqcd W.Geist, ISR data s = 53,62 p π + p π Hard qq scat? Junction predicts anomaly restricted to finite pt window that decreases with N part Hydrodynamic collective flow predicts p/p- > 1 persists to high pt p T GeV INT 12/14/02 21
22 Charged Hadron Lump Could be due to Baryon Junctions I. Vitev, MG, PRC 65 (2002) STAR data PHENIX data Proposed T p =400 MeV junction contribution fit to pt<2 Jet quenching of Pions exposes the baryon junction lump But predicts that at pt>5 Quenched pqcd fragmentation is restored in contrast to hydro INT 12/14/02 22
23 Summary HIJING predicted in 1992 large quenching of p T >2 GeV and many global features of pp and AA at RHIC Confirmed for pions But the striking RHIC baryon anomaly was not anticipated ( not even by Color Glass Breakers ) Baryon Junctions may play a role to predict B, p T, S but collective flow is a strong contender d+a 2003 is extremely important to isolate initial state (shadowing, Cronin) from final state quenching (See talk of I. Vitev) INT 12/14/02 23
24 Ivan Vitev, MG, PRL89 (02) Predict Cronin and Shadow in d+a INT 12/14/02 24
25 P T Dependence of the p / p and L/ L Ratios In the Baryon Junction + pqcd model the onset of the decrease is indicative of dominant pqcd contribution for baryons (4-5 GeV) and depends on the strength of baryon transport in moderate p T INT 12/14/02 25
26 pbar/p Ratio Trend for 130 Gev data Clear decrease for 200 GeV data AuAu 200 GeV preliminary AuAu 130 GeV preliminary TPC de/dx RICH TPC de/dx RICH the onset of the decrease is indicative of dominant pqcd contribution (I.Vitev) INT 12/14/02 26
27 INT 12/14/02 27
28 HIJING/BBar1.0 Topor-Pop QM02 INT 12/14/02 28
29 Junctions may control baryon Transport in both y and p T a (0) Controls moderate p T slope k 1/ 2 1 a ; a Junction R 3 = pa T B P / T ~ 3/ 2 r T = T = T = T L P L J J J ssu sss Hyperonization of baryons And anti-baryons _ ssu I.Vitev, MG, PRC 65 (2002) INT 12/14/02 29
30 Discovery of the Baryon anomaly AuAu Peripheral similar to pp J. Velkovska, INT 12/02 Central low-pt slopes increase with particle mass proton and antiproton yields equal the pion yield at p T >2 collisions at sqrt(s) = 200 GeV INT 12/14/02 30
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