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Identified particle elliptic anisotropy in 200 GeV Au+Au collision at RHIC-PHENIX

Identified particle elliptic anisotropy in 200 GeV Au+Au collision at RHIC-PHENIX. Shingo Sakai Univ. of Tsukuba for the PHENIX Collaboration. p ｙ. ｙ. p ｘ. ｘ. Introduction. Momentum space anisotropy of particle emission. Initial spatial anisotropy.

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Identified particle elliptic anisotropy in 200 GeV Au+Au collision at RHIC-PHENIX

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  1. Identified particle elliptic anisotropy in 200 GeV Au+Au collision at RHIC-PHENIX Shingo Sakai Univ. of Tsukuba for the PHENIX Collaboration

  2. pｙ ｙ pｘ ｘ Introduction Momentum space anisotropy of particle emission Initial spatial anisotropy The azimuthal anisotropy of particle emission is sensitive to the early stages of system evolution

  3. Motivation ・ 　　at low pT (<1.5GeV/c) ・　　　　　　at pT>2.5GeV/c How about heavier particle ? Measure of deuteron + anti-deuteron in 200 GeV Au+Au collision at RHIC-PHENIX

  4. Coalescence model -Coalescence model- deuteron and anti-deuteron produce the coalescence of the individual nucleons n p Au+Au collision at sqrt(SNN)=200GeV d Quark Matter 2002 Anuj K. Purwar and Rickard du Rietz

  5. Method -Reaction plane method- Measure azimuthal angle of each particle respect to the reaction plane Y Reaction Plane X σ=<cos(2(m-real))> = {<cos(2(A-B))>}1/2 particle emission

  6. PHENIX detector PC3 64 pmts in each BBC PC1 BBC Beam Beam Counter (BBC) ||=3-4 TOF DC Tracking 3 units of rapidity away from the mid-rapidity p,φ DC+PC1+PC3 PID・・・ TOF Less non-flow contribution m2 = p2 {(TOF/L)2 -1} HBT、jet、resonance decay

  7. Reaction plane distribution BBCS [rad] [rad] BBCN 2obs 20 [rad] 2Y0=2Y0obs+DY0 0= (Ancos(2nobs) + Bnsin(2nobs)) An = -2/n*<sin(2nobs)> Bn = 2/n*<cos(2nobs)>

  8. PID Momentum [GeV/C] d π K P mass^2 [(GeV/c^2)^2] mass^2 [(GeV/c^2)^2] Including background

  9. dN/dφ distribution 2.0<p<3.0 dn/dφ d+dbar v 2 dn/dφ of background (normalize N ) dn/dφ of subtracted background b Φ-Ψ

  10. Compare with theory ＰＨＥＮＩＸ　Ｐｒｅｌｉｍｉｎａｒｙ P(PHENIX preliminary) d-coalescence model d+dbar systematic error assuming

  11. PID v 2 ＰＨＥＮＩＸ　Ｐｒｅｌｉｍｉｎａｒｙ ・ at low momentum (<1.5GeV/c) pi (*) P.Huovinen, P.F.Kolb, U.W.Heinz, P.V.Ruuskanen and S.A.Voloshin, Phys. Lett. B503, 58 (2001) p deuteron (estimate)

  12. Summary ・deuteron + anti-deuteron (d+dbar)elliptic anisotropy are measured respect to the reaction plane ・ of d+dbar is estimated taking into account background ・　　　　　　　　　　　　at low momentum (<1.5 GeV/c) ・ Coalescence model & hydro model is comparable within error bar (sys.+stat.)

  13. Coalescence model(2)

  14. d+dbar (2.0<p(GeV/c)<3.0) (1.0<p(GeV/c)<2.0) Gaussian+exp fit (3.0<p(GeV/c)<4.0) < selection> Quality 31 || 63 TOF-Track matching cut < 2 σ PC3-Track matching cut < 2 σ TOF E loss > 0.0014Β^(-5/3) |Mass^2|<1.5σ(p)

  15. dN/dφ distribution(1) 1.0<p<2.0 dn/dφ d,dbar v 2 dn/dφ of subtracted background dn/dφ of background (normalize N ) b Φ-Ψ

  16. dN/dφ distribution(2) dn/dφ 3.0<p<4.0 d+dbar v 2 dn/dφ of subtracted background dn/dφ of background (normalize N ) Φ-Ψ b

  17. 0-5% 5-10% 10-20% BBC beam Central arm

  18. Resolution Can’t measure Reaction plane resolution Reaction plane sub-event (divide one event)

  19. B2 Quark Matter 2002 Anuj K. Purwar and Rickard du Rietz

  20. PID v 2 ＰＨＥＮＩＸ　Ｐｒｅｌｉｍｉｎａｒｙ ・ at low momentum (<1.5GeV/c) ・ doesn’t saturate (p<3.0 GeV/c) π+&K+ (PHENIX preliminary) p (PHENIX preliminary) d+dbar Lambda (C. Adler et al. Phys. Rev. Lett. 89, 132301 (2002))

  21. PID v 2 ＰＨＥＮＩＸ　Ｐｒｅｌｉｍｉｎａｒｙ ・ at low momentum (<1.5GeV/c) ・ doesn’t saturate (p<3.0 GeV/c)

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