Model independent analysis method for the differential cross-section of elastic pp scattering T. Csörgő 1,2, T. Novák 1 and A. Ster 2 1 EKU KRC, Gyöngyös,

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Presentation transcript:

Model independent analysis method for the differential cross-section of elastic pp scattering T. Csörgő 1,2, T. Novák 1 and A. Ster 2 1 EKU KRC, Gyöngyös, Hungary 2 Wigner RCP, Budapest, Hungary OUTLINE Model-independent shape analysis: ● General introduction ● Edgeworth, Laguerre ● Levy expansions ● Application in elastic pp scattering Summary

MODEL - INDEPENDENT SHAPE ANALYIS I. Model-independent method, proposed to analyze Bose-Einstein correlations IF experimental data satisfy ●The measured data tend to a constant for large values of the observable Q. ●There is a non-trivial structure at some definite value of Q, shift it to Q = 0. Model-independent, but experimentally testable: ●t = Q R ●dimensionless scaling variable ●approximate form of the correlations w(t) ●Identify w(t) with a measure in an abstract Hilbert-space T. Csörgő and S: Hegyi, hep-ph/ , T. Csörgő, hep-ph/001233

MODEL - INDEPENDENT SHAPE ANALYIS II. Then the function g can be expanded as From the completeness of the Hilbert space, if g(t) is also in the Hilbert space: T. Csörgő and S: Hegyi, hep-ph/ , T. Csörgő, hep-ph/001233

MODEL - INDEPENDENT SHAPE ANALYIS III. Model-independent AND experimentally testable: ●method for any approximate shape w(t) ●the core-halo intercept parameter of the CF is ●coefficients by numerical integration (fits to data) ●condition for applicability: experimentally testabe

GAUSSIAN w(t): EDGEWORTH EXPANSION 3d generalization straightforward ●Applied by NA22, L3, STAR, PHENIX, ALICE, CMS (LHCb)

EXPONENTIAL w(t): LAGUERRE EXPANSIONS Model-independent but experimentally tested: ●w(t) exponential ● t: dimensionless ● Laguerre polynomials First successful tests ●NA22, UA1 data ● convergence criteria satisfied ● intercept parameter ~ 1

Model-independent but: ●Levy: stretched exponential ●generalizes exponentials and Gaussians ● ubiquoutous in nature ● How far from a Levy? ● Need new set of polynomials orthonormal to a Levy weight STRETCHED w(t): LEVY EXPANSIONS

T. Csörgő and S: Hegyi, hep-ph/ , T. Csörgő, hep-ph/ These reduce to the Laguerre expansions and Laguerre polynomials. STRETCHED w(t): LEVY EXPANSIONS

T. Csörgő and S: Hegyi, hep-ph/ , T. Csörgő, hep-ph/ Provides a new expansion around a Gaussian shape that is defined for the non-negative values of t only. arXiv: [physics.data-an] Edgeworth expansion different, its around two-sided Gaussian, includes non-negative values of t also. STRETCHED w(t)=exp(-t  ): LEVY EXPANSIONS

EXAMPLE, LAGUERRE EXPANSIONS T. Csörgő and S: Hegyi, hep-ph/ , T. Csörgő, hep-ph/001233

Model-independent but: ●Levy generalizes exponentials and Gaussians ● ubiquoutous in nature ● How far from a Levy? ● Not necessarily positive definit ! M. de Kock, H. C. Eggers, T. Cs: arXiv: v1 [nucl-th] EXAMPLE, LEVY EXPANSIONS

T. Cs, S. Hegyi, W.A. Zajc, EPJ C36, 67 (2004) Model-independent but: ●Assumes that Coulomb can be corrected ● No assumptions about analyticity yet ● For simplicity, consider 1d case first ● For simplicity, consider factorizable x k ● Normalizations : density multiplicity single-particle spectra LEVY EXPANSIONS for POSITIVE DEFINIT FORMS

MINIMAL MODEL ASSUMPTION: LEVY T. Cs, S. Hegyi, W.A. Zajc, EPJ C36, 67 (2004)

UNIVARIATE LEVY EXAMPLES T. Cs, hep-ph/ , T. Cs, S. Hegyi, W.A. Zajc, EPJ C36, 67 (2004)

Non-Exponential Differential Cross-Section T. Csörgő and S: Hegyi, hep-ph/ , T. Csörgő, hep-ph/001233

However, this method does not extrapolate well T. Csörgő and S: Hegyi, hep-ph/ , T. Csörgő, hep-ph/001233

LEVY EXPANSION FIT TO NON-EXPONENTIALS

T. Csörgő and S: Hegyi, hep-ph/ , T. Csörgő, hep-ph/ Levy expansion method works in a large t interval

T. Csörgő and S: Hegyi, hep-ph/ , T. Csörgő, hep-ph/ Fit range: Up to –t=10 GeV 2 Up to –t=3 GeV 2 FIT RESULTS – LEVY EXPONENTS

T. Csörgő and S: Hegyi, hep-ph/ , T. Csörgő, hep-ph/ t<10GeV 2 -t<3GeV 2 FIT RESULTS – EXPANSION PARAMETERS

SUMMARY AND CONCLUSIONS