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Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop High P T phenomena in h-A and A-A collisions at fixed-target energies Pre-HI high energy.

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Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop High P T phenomena in h-A and A-A collisions at fixed-target energies Pre-HI high energy.

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Presentation on theme: "Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop High P T phenomena in h-A and A-A collisions at fixed-target energies Pre-HI high energy."— Presentation transcript:

1 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop High P T phenomena in h-A and A-A collisions at fixed-target energies Pre-HI high energy nuclear physics Cronin (alias initial state) effect Early R AA and R CP results from SPS exp. New (QM05) R CP data of NA57 and NA49 NA57/WA97 preliminary results on R AA AA di-hadron Φ correlations (from NA45) Summary and conclusions

2 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop High energy nuclear physics of the 70s – 80s Excited nucleon states in nuclei + hypernuclei Interactions of shortly living states (in statu nascendi) with nucleons Particle multiplication processes: multiplicities Modification of PDF in nuclei (EMC effect) Mass number (A) dependence of the (inclusive) cross sections:

3 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop CERN- THE SECOND 25 YEARS Physics Reports, vol , December 2004 The production of jets in hard parton-parton scattering was not really studied at the SPS since, at these energies, the jet structure could not be well resolved from the dominant background of soft processes; this was also the case for the prompt production of mesons at high P t expected to proceed via higher twist QCD mechanism and to have a cleaner experimental signature than that of jets (WA77) No dedicated experiments on high P t hadron production (at SPS) >1976 – SPS, 400 GeV/c p primary beam

4 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop CERN WA72 nuclear experiment M. G. Abreu et al. CERN/EP 84-51, April GeV/c p data do not fit to A α general trend D.S. Barton et al. PRD 27 (1983) 2580

5 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop Fermilab high P t nuclear experiment D. Antreasyan, J. W. Cronin et al, Phys. Rev. D19 (1979) p beam 200,300,400 GeV/c, θ cms 0, targets: p, d, Be, Ti, W P t = 0.77 – 6.9 GeV/c, particles: π, K, p and antiprotons

6 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop A α extrapolation down to pp ? pp cross section lies below σ 0 fit with Dfit without D

7 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop Cronin: relation between α - R AA When: α=1, =3.75, =1.50 (Glauber) R(Pb,Be) = …1.03 ! not too bad 185mb 1.66b

8 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop Cronin: α R pA for K + at 200 GeV/c (Only 3 points at 200 GeV/c, more at 400 GeV/c)

9 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop Cronin: RHIC – Fermilab comparison Antreasyan et.al.Phys.Rev.D19(3)1979 PRELIMINARY qualitative agreement p+A sqrt(s)=27.4 GeV

10 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop Cronin effect - initial state K t broadening Ex: Saturating Cronin effect in ultra-relativistic proton-nucleus collisions, G. Papp, P. Lévai and G. Fai, nucl-th/ Data of Antreasyan et al In conclusions: We are confident that complete NLO calculations, which are left for future work, will improve the agreement further

11 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop HEAVY IONS at CERN SPS AFTER 1986 Priority to the sensitive probes of QGP (strangeness, J/Ψ etc) + bulk properties: multiplicities, Y- P t spectra (blast wave), flow…

12 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop Where is the jet quenching in Pb-Pb ? Xin-Nian Wang, hep-ph/ ,1998 NO EVIDENCE !?

13 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop Reaction operator approach Gyulassy, Levai, Vitev, NP B 594(2001) 371 factor ~ 4

14 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop Discovery ! At RHIC ! (2 years after discovery of QGP at CERN 1:1) J. D. Bjorken Fermilab-Pub THY

15 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop Central-to-peripheral nuclear modification factor(s) R CP at RHIC: high-p T : parton energy loss intermediate p T : baryon/meson effect (recombination?) 1-6% 22-43% WA98 data HIJING m T - m 0 (GeV) R CP STAR, PRL92 (2004) prelim. R CP at SPS? 0 suppressed: energy loss? (see also R AA re-analysis) no baryon/meson comparison WA98, EPJC23 (2002) 225 dEnterria, PLB596 (2004) 32

16 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop WA98, Eur.Phys. J. C23, 225 (2002) R AA (central) m T -m 0 (GeV/c 2 ) R AA R CP ? The (old) SPS R AA /R CP puzzle See also: X. N. Wang, Phys. Rev. C61, (2000) Vitev and Gyulassy PRL 89, (2002) WA98 0 : R AA enhanced, R CP suppressed for central Pb+Pb Calculations: with Cronin effect + quenching do not describe data

17 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop D. dEnterria, nucl-ex/ nucl-ex/ Vitev-Gyulassy Energy loss with dN glue /dy = * At the SPS (s = 20 GeV) no good p+p->π 0 /h reference… * Compared to dN glue /dy = in PRL (2002) SPS Heavy Ion Data Revisited, but a problem:

18 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop D'Enterria '05 Excitation function of the nuclear modification factor Fixed p t SPS Cronin effect + nuclear (anti)shadowing ~compensated by parton energy loss at SPS ! Anti Shadowing

19 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop NA57 R CP results

20 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop Centrality (in)dependence of correction weights no need of MC corrections Corrections for acceptance and efficiency calculated by embedding MC particles of given p T and y in real events, at the level of hits 1.0 no centrality dependence

21 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop R CP from NA57 : PL-B623(2005)17-25 Centrality dependence π,K,p cocktail

22 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop K 0 vs π 0 comparison PHENIX R CP Au-Au 200 GeV Strangeness matters (not only number of valence quarks) RHICSPS

23 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop Strange meson vs strange baryon Similar hierarchy but (of course) a shift by about 0.5 units SPS vs RHIC meson/baron compatible with the parton coalescence mechanism

24 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop Comparison with the parton energy loss models Evidence for parton energy loss at SPS energy

25 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop Energy evolution: PQM vs NA57 data PQM from 200 to 17 GeV Wang and PQM both consistent with NA57 (factor 2 suppression)

26 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop NA49 new data at QM05 NA49 talk by A. Lazslo R CP (baryon)>R CP (meson) same systematics as original Cronin data at similar s same systematics as RHIC but scaled upward Qualitative agreement with NA57 (different peripheral classes !)

27 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop RHIC: disappearance of the away-side jet in central collisions SPS? PRL92(2004) qualitatively: similar pattern quantitatively, within these errors: consistent with acoplanarity broadening no evidence for suppression of away- side yield AA di-hadron Φ correlations at SPS widthyield NA45 peripheral NA45 central

28 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop SUMMARY & CONCLUSIONS High energy nuclear physics (before HIs) legacy Cronin effect discovered at Fermilab (missed at SPS) Early SPS high P t (HI) data, new analysis after discovery of jet quenching at RHIC WA80, WA98, NA45, NA49 and NA57 high P t data point to the non-negligible parton energy loss in the final state, already at sqrt(s) = 17.3 GeV/c Consistency with the Theory – scaling with dN g /dy SPS quenching data, in principle, less biased by the corona effect than RHIC (and LHC) data, but P t range quite limited ( jet tomography not accessible)

29 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop The NA57 Collaboration F. Antinori k, P.A. Bacon e, A. Badalà f, R. Barbera f, A. Belogianni a, I.J. Bloodworth e, M. Bombara h, G.E. Bruno b, S.A. Bull e, R. Caliandro b, M. Campbell g, W. Carena g, N. Carrer g, R.F. Clarke e, A. Dainese k, D. Di Bari b, S. Di Liberto n, R. Divià g, D. Elia b, D. Evans e, G.A. Feofilov p, R.A. Fini b, P. Ganoti a, B. Ghidini b, G. Grella o, H. Helstrup d, K.F. Hetland d, A.K. Holme j, A. Jacholkowski f, G.T. Jones e, P. Jovanovic e, A. Jusko e, R. Kamermans r, J.B. Kinson e, K. Knudson g, V. Kondratiev p, I. Králik h, A. Kravčáková i, P. Kuijer r, V. Lenti b, R. Lietava e, G. Løvhøiden j, V. Manzari b, M.A. Mazzoni n, F. Meddi n, A. Michalon q, M. Morando k, P.I. Norman e, A. Palmeri f, G.S. Pappalardo f, B. Pastirčák h, R.J. Platt e, E. Quercigh k, F. Riggi f, D. Röhrich c, G. Romano o, K. Šafařík g, L. Šándor h, E. Schillings r, G. Segato k, M. Sené l, R. Sené l, W. Snoeys g, F. Soramel k, M. Spyropoulou-Stassinaki a, P. Staroba m, R. Turrisi k, T.S. Tveter j, J. Urbán i, P. van de Ven r, P. Vande Vyvre g, A. Vascotto g, T. Vik j, O. Villalobos Baillie e, L. Vinogradov p, T. Virgili o, M.F. Votruba e, J. Vrlakova i, P. Závada m. a: Athens, b: Bari, c: Bergen, d: Bergen, e: Birmingham, f: Catania, g: CERN, h: Kosice, i: Kosice, j: Oslo, k: Padova, l: Collège de France, m: Prague, n: Rome, o: Salerno, p: St. Petersburg, q: Strasbourg, r: Utrecht

30 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop backup slides (just in case…)

31 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop WA77 CERN higher twist experiment …nothing in our data contradicts the HT estimates following from QCD sum rules predictions. π - Be 150,300 GeV/c A Belogianni et al., Z. Phys. C 69 (1996)235

32 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop Experimental facts – dAu (pPb) at SPS R dAu = d 2 N(h - )/dp T dy (d+Au) N Coll d 2 N( - ) /dp T dy (p+p) Similar trend at the AGS: R. Debbe et al. (BRAHMS) CINPP proceedings (2005) dAu pPb Increasing suppression with increasing x F Pattern similar for pions and antiprotons, different for protons B. Boimska (NA49), PhD thesis, Warszawa (2004) T. Alber et al. (NA35), Eur. Phys. J. C 2, 643 (1998)

33 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop NA57 Experimental Layout Target: 1% Pb Scintillator Petals: centrality trigger MSD: Multiplicity Silicon Detector Tracking device: silicon pixel planes (5 x 5 cm 2 ) Lever arm: double-sided strips

34 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop NA57 acceptance

35 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop NA57 mass signals

36 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop NA57 centrality bins Pb-Pb 160 A GeV Class / tot 160 GeV 40 GeV 040 – 53% – 40% – 23% – 11% – 4.5%349346

37 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop + modified recombination

38 Adam JacholkowskiPadova 29 September 2005 Quench-Mini-Workshop CBBO - CERN BIG BANG ORCHESTRA Acceleration/ Celebration


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