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Strange Baryon Resonances

Strange Baryon Resonances. Christina Markert, Yale University. Motivation Results (1520) ,(1385) and (1530) from p+p, Au+Au and first d+Au Data Summary and Future Plans. Christina Markert, Sevil Salur, Richard Witt (Yale/Bern), Ludovic Gaudichet (Subatech/Nantes).

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Strange Baryon Resonances

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  1. Strange Baryon Resonances Christina Markert, Yale University • Motivation • Results (1520) ,(1385) and (1530) • from p+p, Au+Au and first d+Au Data • Summary and Future Plans Christina Markert, Sevil Salur, Richard Witt (Yale/Bern), Ludovic Gaudichet (Subatech/Nantes) DOE Meeting at Yale, September 2003

  2. Resonances in Medium Short life time [fm/c]  <  < K* < * < * < * <  1.3<1.7< 4 < 6 < 13 < 20 < 40 • Strangeness enhancement ? • Temperature at chemical freeze-out ?  Yield (Thermal models) • Time between chemical and kinetic freeze-out ? • Rescattering and regeneration of resonance decay particles •  Yield and pt spectra (Microscopic models UrQMD)

  3. *-L+- -L+- *+L++ *-L+- *+L++ +L++ *   +  __ __ __ __ p __ __ K- (1520) (1520)  p+K- , p+K+ _ Resonance reconstruction in STAR TPC (1520) (1385), (1530) End view Front view

  4. (1385) preliminary  * Strange Resonances Signals in p+p at 200 GeV (1520) Mixed technique Mixed technique mass 1.516  0.001 GeV width 18 MeV fixed (1530) V0 technique V0 technique

  5. Resonance pt Spectra in p+p at 200 GeV (1520) preliminary <pT> 0.92  0.03 GeV (1385) and X(1530) enough statistics corrections still underway

  6. Mean pt in p+p at 200 GeV (1385)? (1530) ?  (1520) Helen SQM2003 <pt> for high mass resonances in p+p higher than particles with same mass ?

  7. Strange Resonance Production in Au+Au Collisions (1520)  (1385) No mass shift or width broadening visible

  8. Resonance Production in p+p and Au+Au UrQMD Microscopic model preliminary Tch = 175 MeV Tch = 120 MeV Thermal description: Chemical freeze-out temperature Tch = 120 MeV Microscopic model : Time span between chemical and kinetical freeze-out  = 5-10 fm/c. (1385) ?  analysis on the way Decrease from p+p to A+A at 200GeV : 70% ± 45%

  9. First look at d+Au Data (1385) (1530) (1520)

  10. Summary + Future Plans • Measure (1520) ,(1385) ((1530)) in p+p, d+Au and Au+Au collisions. • High mean pt in p+p for (1520) and (1385) . • Strange resonance/non resonance ratio shows decrease in Au+Au collisions • compared to p+p collisions. •  Tchem =120 MeV (thermal model) . • Or  Time between chem. and kin. freeze-out  = 5-10 fm/c (microscopic model). • Future Plans: • Complete d+Au and Au+Au analysis • write resonance paper (d+Au, p+p and Au+Au) • Put together results from (*,*,*) with , , K* and , • compare it with theoretical predictions. • Resonance meeting at Yale in Dec2002, • plan to have another resonance meeting later this year. • Full pt spectra for (1520) and (1530) with higher statistics from upcoming Au+Au run.

  11. Pentaquark at STAR (first look) STAR ideal decay mode is Q+->pK0s p-p Signal estimation: 1.6 Million Au-Au events = 3 s peak. No signal yet Au-Au d-Au

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