“Predictions” for PbPb at LHC Based on the Extrapolation of Data at Lower Energies Wit Busza MIT Many thanks to Alex Mott, Yen-Jie Lee and Andre Yoon for.

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Presentation transcript:

“Predictions” for PbPb at LHC Based on the Extrapolation of Data at Lower Energies 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

Wit BuszaLHC Workshop, May 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 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 And over the entire rapidity range

Wit BuszaLHC Workshop, May Scaling Laws 19.6 GeV62.4 GeV130 GeV200 GeV PHOBOS preliminary Au + AuCu + Cu PHOBOS, Gunther Roland QM GeV200 GeV PHOBOSpreliminary

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

Wit BuszaLHC Workshop, May 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 (1977)  ’ =  - y beam PHOBOS, Phys. Rev. C 74, (R) (2006) DELPHI, Phys. Lett. B (1999)

Wit BuszaLHC Workshop, May Elliptic Flow PHOBOS, Nucl.Phys. A757 (2005) GeV

Wit BuszaLHC Workshop, May PHOBOS, Phys. Rev. C72, (R) (2005) PHOBOS, Phys. Rev. C (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*

Wit BuszaLHC Workshop, May PHOBOS, Hofman, QM2006 Linear scaling in N PART scaling in  and dN/d 

Wit BuszaLHC Workshop, May 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) GeV GeV

Wit BuszaLHC Workshop, May Data from compilation in review of particle physics scaled by in  and dN/d 

Wit BuszaLHC Workshop, May Data compiled by PHOBOS, R. Nouicer, PANIC 05

Wit BuszaLHC Workshop, May W. Busza, Acta Phys. Pol. B35 (2004)2873

Wit BuszaLHC Workshop, May AuAu Data from PHOBOS, Nucl. Phys. A757 (2005) 28 N PART = GeV 200GeV 130GeV

Wit BuszaLHC Workshop, May 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) PHOBOS, Phys. Rev. C (2006)

Wit BuszaLHC Workshop, May Au+Au PHOBOS Cu+Cu preliminary AuAu: PHOBOS data Hofman, QM06 G.Roland, QM 05

Wit BuszaLHC Workshop, May Data Au+Au 19.6 GeV62.4 GeV130 GeV 200 GeV preliminary PHOBOS Cu+Cu AuAu: PHOBOS: PRL (2005) CuCu: PHOBOS: PRL accepted for publication

Wit BuszaLHC Workshop, May Compilation of data from Phys. Rev. C68 (2003)

Wit BuszaLHC Workshop, May Elliptic Flow PHOBOS, Nucl.Phys. A757 (2005) 28 G. Roland, PANIC GeV

Wit BuszaLHC Workshop, May GeV Au+Au PHOBOS 0-40% centrality: PRL 97, (2006) PHOBOS

Wit BuszaLHC Workshop, May Scaling Laws Au+Au Cu+Cu Ratio of charged hadron yields in 200 GeV to 62 GeV Au+Au: PHOBOS, PRL 94, (2005) = 0.25 GeV/c = 1.25 GeV/c = 2.5 GeV/c = 3.38 GeV/c = 3.88 GeV/c Energy and Geometry Factorization seems to apply to P T spectra

Wit BuszaLHC Workshop, May Value of P T at which yield of   and p are equal G. Veres, QM05

Wit BuszaLHC Workshop, May B. Sahlmüller, QM06

Wit BuszaLHC Workshop, May p+A collisions PHOBOS nucl-ex/  pA =  0 A  xFxF W. Busza, Nucl. Phys. A544:49 (1992) E451, PRD27 (1983) 2580 Various final states: ,  +,  ,p,p,n,  K 0, ,K +,K  Various beam energies:24, 100, 300, 400 GeV G. Veres, QM05  Skupic et al. Be & Pb targets

Wit BuszaLHC Workshop, May Summary of Main “Predictions” Total charged multiplicity in central (N PART =386) PbPb collisions at (√s = 5.5 TeV) = /- 100 Total charged multiplicity in NSD pp collisions at (√s = 14 TeV) = 72 +/- 8

Wit BuszaLHC Workshop, May 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.