Strange Baryon Resonances
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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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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)

DOE Meeting at Yale, September 2003


Resonances in medium

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)


Resonance reconstruction in star tpc

*-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


Strange resonances signals in p p at 200 gev

(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


Resonance pt spectra in p p at 200 gev

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


Mean pt in p p at 200 gev

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 ?


Strange resonance production in au au collisions

Strange Resonance Production in Au+Au Collisions

(1520)

(1385)

No mass shift or width broadening visible


Strange baryon resonances

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%


Strange baryon resonances

First look at d+Au Data

(1385)

(1530)

(1520)


Summary future plans

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.


Pentaquark at star first look

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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