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Paul Chung for the STAR Collaboration Nuclear Physics Institute ASCR Prague 23.09.2011 WPCF 2011, Tokyo 3D kaon source extraction from 200GeV Au+Au collisions.

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Presentation on theme: "Paul Chung for the STAR Collaboration Nuclear Physics Institute ASCR Prague 23.09.2011 WPCF 2011, Tokyo 3D kaon source extraction from 200GeV Au+Au collisions."— Presentation transcript:

1 Paul Chung for the STAR Collaboration Nuclear Physics Institute ASCR Prague 23.09.2011 WPCF 2011, Tokyo 3D kaon source extraction from 200GeV Au+Au collisions 1

2 PHENIX Pion & Kaon Source Extrac. PRL100, 232301 (2008)PRL103, 142301 (2009) 23.09.2011 WPCF 2011, Tokyo 2

3 23.09.2011 WPCF 2011, Tokyo 3 Outline Overview of 3D source shape analysis : Cartesian Spherical Harmonic decomposition & Imaging/Fitting Technique Kaon correlation moments & extracted 3D S(r) from Run 4 central Au+Au collisions @ low K T Model comparison (Therminator & Hydjet) for extracting Kaon source freeze-out parameters (lifetime & emission duration) K T dependence of extracted source dimensions & model comparison (Buda-Lund & Hydro Kinetic Model) 3

4 23.09.2011 WPCF 2011, Tokyo 4 Technique Devised by: D. Brown, P. Danielewicz, PLB 398:252 (1997). PRC 57:2474 (1998). Inversion of Linear integral equation to obtain source function Source function (Distribution of pair separations) Encodes FSI Correlationfunction Inversion of this integral equation ==  Source Function Emitting source 1D Koonin Pratt Eqn. Extracted S(r) in pair CM frame Hence Model-independent i.e Kernel independent of freeze-out conditions No Shape assumption for S(r) 1D Imaging Formulation 4

5 23.09.2011 WPCF 2011, Tokyo 5 (3) 3D Koonin Pratt Plug in (1) and (2) into (3) Invert (1) Invert (2) Expansion of R(q) and S(r) in Cartesian Harmonic basis [Danielewicz and Pratt nucl-th/0501003 (v1)] x=out-direction y=side-direction z=long-direction 3D Analysis Basics 5

6 Kaon correlation moments (Runs 4 &7) 23.09.2011 WPCF 2011, Tokyo 6 Ellipsoid shape adequate representation of 3D S(r)

7 Kaon 3D Source Function Therminator: Comput.Phys.Commun. 174, 669 (2006) HydroDynamics with Jets (HYDJET) : arXiv: 0809.2708v2 23.09.2011 WPCF 2011, Tokyo 7 HYDJET gives larger source lifetime than THM

8 kaon PID @ 0.2<pT<0.36 GeV/c Au+Au (0-30%) 23.09.2011 WPCF 2011, Tokyo -1.5<Number of Sigma<2.0 8 Rigidity (GeV/c) dE/dx No PID selection STAR PRELIMINARY

9 kaon PID @ 0.36<pT<0.48 GeV/c Au+Au (0-30%) 23.09.2011 WPCF 2011, Tokyo -0.5<Number of Sigma<2.0 9 Rigidity (GeV/c) dE/dx No PID selection STAR PRELIMINARY

10 Run4 Kaon CF: L=0 moment 23.09.2011 WPCF 2011, Tokyo 10 L=0 moment in agreement with 1D C(q)

11 Kaon Ellipsoid Fits 23.09.2011 WPCF 2011, Tokyo 11 Ellipsoid shape adequate representation at both K T bins

12 Buda-Lund & HKM model comp. Buda-Lund: arXiv:0801.4434v2 HKM: PRC81, 054903 (2010) 23.09.2011 WPCF 2011, Tokyo 12

13 Conclusion 23.09.2011 WPCF 2011, Tokyo Extracted Kaon source functions from 200GeV Au+Au collisions essentially Gaussian in shape Gaussian source well reproduced by Therminator calcs: compatible source freeze-out conditions as for pions Hydjet (2-Temperature model) vs Therminator (1-temperature model) => larger source lifetime Gaussian radii in agreement with Buda-Lund prediction at higher K T bin, disagrees at lower K T bin => apparent violation of mT scaling between pion and kaon Gaussian radii HKM prediction looks promising but for centrality difference 13

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