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Blast-wave Model Calculation of v2 including Resonance Decays

Blast-wave Model Calculation of v2 including Resonance Decays. Kang Seog Lee, Suk Choi (Chonnam Nat’l Univ.). ATHIC 2012. Blast-wave model. Suk Choi & K.S.Lee, prc84, 064905, 2011. S. Schlichting, S. Pratt,Phys.Rev.C83:014913,2011 F. Retiere, M. Lisa, Phys.Rev. C70 (2004) 044907.

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Blast-wave Model Calculation of v2 including Resonance Decays

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  1. Blast-wave Model Calculation of v2 including Resonance Decays Kang Seog Lee, Suk Choi (Chonnam Nat’l Univ.) ATHIC 2012

  2. Blast-wave model Suk Choi & K.S.Lee, prc84, 064905, 2011 S. Schlichting, S. Pratt,Phys.Rev.C83:014913,2011 F. Retiere, M. Lisa, Phys.Rev. C70 (2004) 044907

  3. V2(elliptic flow)

  4. Elliptic flow as a result of transverse expansion • Linear increase with pT in the low pT region • Mass ordering • Saturation – due to shear viscosity • - role of bulk viscosity recently discussed • Resonance contribution destroys elliptic flow and • may cause saturation. Ollitrault • Effect of Resonance contribution to saturation of v2 has been investigated in this work.

  5. Hadron spectrum in blast-wave model - Cooper-Frye formula H. Dobler, J. Sollfrank, U. Heinz, P.L. B457,353(1999) Schnedermann, Sollfrank, Heinz

  6. Elliptic coefficient from hadron spectrum - coefficient of 2nd harmonics

  7. Geometrical structure at f.o. • Elliptical sub-shell of the source • Freeze-out radius • Transverse rapidity Other parameters fixed to fit pT and y spectrum

  8. PHENIX central no saturation

  9. PHENIX central

  10. Conclusion • Withina blast-wave model with resonance contribution, elliptic coefficient, v2 measured at RHIC has been studied. • 2. V2 develops when or . • 3. Saturation occurs on when and . • 4. Resonance decays reduce v2 by more than half. • Careful treatment of resonance decay needed. • 5. The radii and the transverse expansion rapidities are • parameters and whether they are consistent with the • hydrodynamic evolution has to be checked. However, • in the hydrodynamic calculation freeze-out is • continuous.

  11. Results of thermal analysis Tth=121.1 MeV mp-=126.4 MeV hmax=5.0 r0=1.03 gs=0.986 c2/n=5.3

  12. Pseudo-rapidity distribution of charged hadrons

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