Model independent analysis of nearly Levy correlations in 1, 2 and 3 dimensions T. Csörgő KRF, Wigner RCP H.C. Eggers and M.B. De Kock University of Stellenbosh.

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Presentation transcript:

Model independent analysis of nearly Levy correlations in 1, 2 and 3 dimensions T. Csörgő KRF, Wigner RCP H.C. Eggers and M.B. De Kock University of Stellenbosh OUTLINE Model-independent shape analysis: ● General introduction ● Edgeworth, ● Laguerre, ● Levy expansions Summary T. Novák KRF, Wigner RCP Modern Fizika Napja, KRF 31 March 2016 T. Csörgő and S: Hegyi, hep-ph/ , T. Csörgő, hep-ph/001233

MODEL - INDEPENDENT SHAPE ANALYIS I. Model-independent but experimentally testable: ●w(t) measure in an abstract H-space ●approximate form of the correlations ●t: dimensionless scale variable

MODEL - INDEPENDENT SHAPE ANALYIS II. Then the function g can be expanded as From the completeness of the Hilbert space and from the assumption that g(t) is 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

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

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

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

MINIMAL MODEL ASSUMPTION: LEVY 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

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)

LEVY EXPANSIONS: ~ 1d LEVY Model-independent but: ●Levy generalizes exponentials and Gaussians ● ubiquoutous in nature ● How far from a Levy? ● Need new set of polynomials orthonormal to a Levy weight M. de Kock, H. C. Eggers, T. Cs: arXiv: v1 [nucl-th]

LEVY EXPANSIONS: ~ 1d LEVY T. Csörgő and S: Hegyi, hep-ph/ , T. Csörgő, hep-ph/ These reduce to the Laguerre expansions and Laguerre polynomials.

LEVY EXPANSIONS: ~ 1d LEVY 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.

MULTIVARIATE LEVY DISTRIBUTIONS T. Cs, S. Hegyi, W.A. Zajc, EPJ C36, 67 (2004)

MULTIVARIATE LEVY EXPANSIONS M. de Kock, H. C. Eggers, T. Cs: arXiv: v1 [nucl-th] 1st-order Levy expansion

POSSIBLE APPLICATIONS I

POSSIBLE APPLICATIONS II Could be multivariate Levy and expansion term could be added. But the form of the background may modify the signal. Felix’s talk at WPCF2015 (background substraction)

SUMMARY AND CONCLUSIONS