1 Strange Resonance Production in p+p and Au+Au Collisions at RHIC energies. Christina Markert, Yale University for the STAR Collaboration QM2004, 11-17.

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1 Strange Resonance Production in p+p and Au+Au Collisions at RHIC energies. Christina Markert, Yale University for the STAR Collaboration QM2004, January, Oakland Motivation Resonance Analysis Results and Theory Summary and Future Plans

2 Resonances Resonance K(892)   (1385)  (1520)  (1530) Decay channel K +  K+K  +  p + K  +  Width [MeV] Life time [fm/c] Excited state of ground state particles with same quark content and higher mass Short lifetime on the order few fm/c (lifetime of fireball) Decay strongly Jingguo Ma:  meson production  aibin Zhang:  (1232), K*(892) and  770) resonance production Sevil Salur:  (1385) Posters !!!

3 Resonances in Medium Comparison of p+p and A+A collisions show effects of interactions in an expanded reaction volume. Short life time [fm/c]  <  < K* <  * <  * <  * <  1.3<1.7< 4 < 6 < 13 < 20 < 40 Time between chemical and kinetic freeze-out ? Rescattering and regeneration of resonances  Yield and p T spectra (Microscopic models) Rescattering of decay daughters  signal loss Regeneration of resonance  signal gain

4 Resonance reconstruction in STAR TPC Energy loss in TPC dE/dx momentum [GeV/c] dE/dx Invariant mass: p K  e  (1385) -- -- p   (1520) K-p K(892)   + K  (1020)  K + K  (1520)  p + K  (1385)   +    +  End view

5  (1520) STAR Preliminary Statistical error only K(892)  (1385) Strange Resonances in p+p at 200 GeV  STAR Preliminary  (1520)

6 Resonance p T Spectra in p+p at 200 GeV at mid Rapidity p T -coverage (yield)  p T  (integrated) K(892) 95% 680  30  30 MeV  (1385) 81% 1100  20  100 MeV  (1520) 91% 1080  90  110 MeV  (1520) K(892)  (1385) dN/dy at y=0 K(892) =    (1520) =   a.u.

7 Mean p T in p+p at 200 GeV Bourquin and Gaillard Nucl. Phys. B 114 (1976) High mass particles are not following the mean p T trend of ISR ( ,K,p). Stronger mass dependence. p+p at 23 GeV

8 Strange Resonance Production in Au+Au Collisions STAR Preliminary Au+Au minimum bias p T  0.2 GeV/c |y|  0.5 K *0 + K *0 Statistical error only K(892)  (1520) STAR Preliminary dN/dy at y=0 central Au+Au K(892)+Anti-K(892)/2 = 10.2  0.5  1.6 (poster H. Zhang)  (1020) = 7.70  0.30  10% (poster J. Ma)  (1520) = 0.58  0.21  40% (assuming T= MeV)  (1020) STAR Preliminary

9 Resonance  Production in p+p and Au+Au Thermal model [1]: T = 177 MeV  B = 29 MeV [1] P. Braun-Munzinger et.al., PLB 518(2001) 41 D.Magestro, private communication [2] Marcus Bleicher and Jörg Aichelin Phys. Lett. B530 (2002) M. Bleicher, private communication Rescattering and regeneration is needed ! UrQMD [2] Life time [fm/c] :  (1020) = 40  (1520) = 13 K(892) = 4  ++ = 1.7

STAR Preliminary K(892) p+p Au+Au Signal loss in low p T Region STAR Preliminary K(892) p+p Au+Au   % - 80%   pp   % - 10% (GeV/c) Centrality K(892)Proton Inverse slope increase from p+p to Au+Au collisions. UrQMD predicts signal loss at low p T due to rescattering of decay daughters.  Inverse slopes and mean p T are higher. UrQMD has long lifetime (  5-20fm/c) Signal loss of ~70% for K(892)

11 Temperature, lifetime, and centrality dependence from  (1520) /  and K(892)/K Model includes: Temperature at chemical freeze-out Lifetime between chemical and thermal freeze-out By comparing two particle ratios (no regeneration) results between : T= 160 MeV =>  > 4 fm/c (lower limit !!!)  = 0 fm/c => T= MeV  (1520)/  =   K*/K - = 0.20  0.03 at 0-10% most central Au+Au G. Torrieri and J. Rafelski, Phys. Lett. B509 (2001) 239 Life time: K(892) = 4 fm/c  (1520) = 13 fm/c preliminary More resonance measurements are needed to verify the model and lifetimes Blast wave fit of ,K,p (T kin +  T chem   ~ 6 fm/c (see poster Olga Barannikova)  does not change much with centrality because slight  T reduction is compensated by slower expansion velocity  in peripheral collisions. UrQMD   ~ 5-20 fm/c

12 Summary Higher mass resonances (and  show high mean p T in p+p collisions. K(892)/K and  (1520)/  ratios are smaller in Au+Au than in p+p collisions. Thermal model predictions are higher than data. Rescattering and regeneration in hadronic source after chemical freeze-out.  Microscopic model calculations are needed (e.g. UrQMD). Lifetime between chemical and kinetical freeze-out (  ) is greater than 4 fm/c. In agreement with results from blast wave fits of ,K,p spectra. Small centrality dependence in K(892)/K and  (1520)/  ratios. Suggest same lifetime (  ) for peripheral and central Au+Au collisions.

13 Future Plans  (1530) in p+p  (1385) in d+Au  (1520) in d+Au  (1385) in Au+Au STAR Preliminary More resonances measurements to come for Au+Au and p+p:  (1385),  (1530) Smallest medium with d+Au collision STAR Preliminary Investigation of exotic particles with resonance technique Poster:Sevil Salur: Pentaquark searches with STAR at RHIC

14 Surviving probability of Resonances in UrQMD - all decay - measured chemical freeze out ~ 5fm/c thermal freeze out ~30 fm/c (long life time !) Short life time [fm/c]  <  < K* <  * <  * <  * <  1.3<1.7< 4 < 6 < 13 < 20 < 40

15 Invariant mass histogram