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Some simple common trends in pp, pA, AA, and even e+e- multiparticle production and “Predictions” for pp and PbPb at LHC Wit Busza MIT Many thanks to Alex.

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Presentation on theme: "Some simple common trends in pp, pA, AA, and even e+e- multiparticle production and “Predictions” for pp and PbPb at LHC Wit Busza MIT Many thanks to Alex."— Presentation transcript:

1 Some simple common trends in pp, pA, AA, and even e+e- multiparticle production and “Predictions” for pp and PbPb at LHC Wit Busza MIT Many thanks to Alex Mott, Yen-Jie Lee and Andre Yoon for help with many of the plots, and Y.Yilmaz for N PART calculations for PbPb at LHC

2 Wit BuszaSQM 20072 For a very broad range of energies and geometry of the collision: The global distributions of charged particles produced in pp, pA, AA, and even e + e - collisions show remarkably similar trends, and data is found to factorize into an energy dependent part and a geometry, or incident system dependent part The trends allow us to “predict” with high precision several important results that will be seen in pp and PbPb at LHC. More important, an understanding of what happens in AA collisions must include an explanation of these trends and the broad range over which they seem to apply For from <10 GeV to 200 GeV For N PART from 2-350 And over the entire rapidity range

3 Wit BuszaSQM 20073 Scaling Laws 19.6 GeV62.4 GeV130 GeV200 GeV PHOBOS preliminary Au + AuCu + Cu PHOBOS, Gunther Roland QM 2005 62.4 GeV200 GeV PHOBOSpreliminary

4 Wit BuszaSQM 20074 CDF (900) Phys.Rev D 41 (1990) 2330 UA5 (200,546) Z.Phys.C 43 1 (1989) ISR (23.6,45.2) Nucl.Phys B 129 365 (1977)  ’ =  - y beam PHOBOS, Hofman, QM2006 DELPHI, Phys. Lett. B459 397 (1999)

5 Wit BuszaSQM 20075 PHOBOS, Phys. Rev. C72, 031901(R) (2005) PHOBOS, Phys. Rev. C74 021902 (R ) 2006 W. Busza, Acta Phys. Pol. B35 (2004)2873 E178: W.Busza et al. PRL34 (1975) 836 *: A.Bialas and W.Czyz or wounded nucleons*

6 Wit BuszaSQM 20076 Data compiled by PHOBOS, R. Nouicer, PANIC 05

7 Wit BuszaSQM 20077 AuAu Data from PHOBOS, Nucl. Phys. A757 (2005) 28 N part = 360 200GeV 130GeV 20GeV

8 Wit BuszaSQM 20078 PHOBOS, Hofman, QM2006 Linear scaling in N PART scaling in  and dN/d  AuAu Data from PHOBOS, Nucl. Phys. A757 (2005) 28

9 Wit BuszaSQM 20079 Data from compilations in Nucl. Phys. B142 (1978) 445 and Phys. Rev. D35 (1987) 3537 scaling in  and dN/d  N PART for p-emulsion = 3.4 Data from compilations in Nucl. Phys. B142 (1978) 445 and Phys. Rev. D35 (1987) 3537 11.3 GeV - 38.8 GeV

10 Wit BuszaSQM 200710 Data from compilation in review of particle physics scaled by in  and dN/d 

11 Wit BuszaSQM 200711 W.B, Acta Phys. Pol. B35 (2004)2873

12 Wit BuszaSQM 200712 Scaling Laws Au+Au 0-6% Au+Au 35-40% 200GeV 130GeV 62.4 GeV (prel) 19.6 GeV 200GeV 130GeV 62.4 GeV (prel) 19.6 GeV AuAu: PHOBOS, PRL 91 (2003) 052303 PHOBOS, Phys. Rev. C74 021901 (2006)

13 Wit BuszaSQM 200713 Au+Au PHOBOS Cu+Cu preliminary AuAu: PHOBOS data Hofman, QM06 G.Roland, QM 05

14 Wit BuszaSQM 200714 Elliptic Flow PHOBOS, Nucl.Phys. A757 (2005) 28 19.6 - 200 GeV

15 Wit BuszaSQM 200715 Compilation of data from Phys. Rev. C68 (2003) 034903

16 Wit BuszaSQM 200716 Elliptic Flow PHOBOS, Nucl.Phys. A757 (2005) 28 G. Roland, PANIC 05 19.6 - 200 GeV

17 Wit BuszaSQM 200717 Summary of Main “Predictions” Total charged multiplicity in central (NPART =386) PbPb collisions at (√s = 5.5 TeV) = 15000 +/- 1000 and dn/d  at mid rapidity = 1200+/- 100 Total charged multiplicity in NSD pp collisions at (√s = 14 TeV) = 70 +/- 8

18 Wit BuszaSQM 200718 Final Comments If these “predictions” turn out to be correct, more than ever, any model which claims to explain the phenomena observed in heavy ion collisions at ultra relativistic velocities, must contain an explanation for the observed trends, as well as the broad range of systems, energies and rapidities over which the trends are observed. If these “predictions” turn out to be false, it will be a direct indication of the onset of new phenomena at LHC energies. If the observed trends are a consequence of some very general principles, it means that the data on the global properties is not sensitive to the details of the system formed in AA collisions. It then follows that we learn little from models that agree with this data, unless at the same time the models explicitly explain the trends.

19 Wit BuszaSQM 200719 PHOBOS, Hofman, QM2006 –– PHOBOS, Nucl. Phys. A 757 (2005) 28. E178: PRD 22 (1980) 13 Veres, QM2005

20 Wit BuszaSQM 200720 CDF (900) Phys.Rev D 41 (1990) 2330 UA5 (200,546) Z.Phys.C 43 1 (1989) ISR (23.6,45.2) Nucl.Phys B 129 365 (1977)  ’ =  - y beam PHOBOS, Phys. Rev. C 74, 021902(R) (2006) DELPHI, Phys. Lett. B459 397 (1999)

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