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Presentation transcript:

for STAR Collaboration Spin alignment of vector mesons (Φ, K*0) in Heavy-Ion Collisions at RHIC Jinhui Chen for STAR Collaboration

Outline Introduction Analysis method and results 1) Spin alignment with respect to reaction plane 2) Spin alignment with respect to production plane Summary and outlook Jinhui Chen QM06 Nov.14-20 Shanghai China

Introduction Spin alignment of vector mesons is a unique probe of particle production and dynamics[1,2] 1. Orbital angular momentum  spin? 2. Coalescence/Fragmentation of polarized quarks? 3. Contributions to the significant collective flow observed at RHIC? Spin alignment of vector mesons is described by We measure ρ00 through decayed products angular distribution in the rest frame of vector mesons: spin density matrix (s=1)  Deviation of ρ00 from 1/3 manifests the alignment of vector mesons 1. Z.T. Liang and X.N. Wang, PRL 94 102301 (05), PRL 96 039901 (06), PLB 629 (05) 20-26; 2. S.A. Voloshin nucl-th/0410089. Jinhui Chen QM06 Nov.14-20 Shanghai China

Previous measurements Λ polarization Fermi-lab 1976 G. Bunce et al. PRL 36 (1976) 1113 OPAL Col. PLB 412 (1997) 210 ρ00 J. Duryea et al. PRL 67 (1991) 1193 E896 Col. NPA 698 (2002) 499 PΛ Jinhui Chen QM06 Nov.14-20 Shanghai China

Measurement from RHIC-STAR STAR Detector Features at RHIC: Formation of bulk partonic matter Hadronization from bulk partonic matter is different from fragmentation scheme  Constituent quark degree of freedom ? STAR Collaboration, NPA 757 (05) 102 x y beam reaction plane Measurements for: Global hyperon polarization Global vector meson spin alignment Jinhui Chen QM06 Nov.14-20 Shanghai China

Hyperon polarization vs vector meson spin alignment 27% Yi-Jin Pei, hep-ph/9703243. x y beam secondary vertec reaction plane Jinhui Chen QM06 Nov.14-20 Shanghai China

Analysis details (φ-meson) Using mixed event method to get the raw dN(pT)/dcos(θ*) distribution. Correct the dN(pT)/d(cosθ*) with detector acceptance. Fitting dN(pT)/d(cosθ*) with to get the ρ00obs. Correct ρooobs with “reaction plane resolution” to obtain ρ00. Jinhui Chen QM06 Nov.14-20 Shanghai China

ρ00 vs pT STAR Preliminary |y|<1.0 With statistical and systematical uncertainties, φand K*0 spin are not aligned w.r.t. reaction plane. Jinhui Chen QM06 Nov.14-20 Shanghai China

ρ00 vs Npart STAR Preliminary |y|<1.0 With the data sample, we have not observed global spin alignment for φand K*0 at different centrality. Centrality 10-40% Jinhui Chen QM06 Nov.14-20 Shanghai China

What about Λ global polarization? Au+Au @ 200GeV (20-70%) Au+Au @ 62GeV (0-80%) (GeV/c) STAR Preliminary I. Selyuzhenkov’s talk Section 3.4, Nov. 19 With statistical and systematical uncertainties, we have not observed global spin alignment for φ, K*0 and global polarization for Λ at mid-central collisions. Jinhui Chen QM06 Nov.14-20 Shanghai China

Spin alignment w.r.t. production plane Hyperons H produced in unpolarized p+p  H+X or p+A  H+X are transversely polarized w.r.t. production plane. What about vector mesons? transversely polarized? correlated with spin alignment w.r.t. reaction plane? production plane Jinhui Chen QM06 Nov.14-20 Shanghai China

ρ00 vs pT STAR Preliminary |y|<1.0 Φand K*0 spin may be slightly aligned at low pT w.r.t. production plane. 0.8<pT<1.2GeV/c Jinhui Chen QM06 Nov.14-20 Shanghai China

And p+p collisions ? STAR Preliminary |y|<1.0 φ-meson spin alignment in p+p collisions needs more statistics to be conclusive. Jinhui Chen QM06 Nov.14-20 Shanghai China

Compared with Au+Au STAR Preliminary We are interested in possible difference in φ and K*0 spin alignment between Au+Au and p+p collisions due to different dynamics. In current statistics, the spin alignment of φ-meson between Au+Au and p+p collisions are similar. Jinhui Chen QM06 Nov.14-20 Shanghai China

Time of Flight detector upgrade One tray will enhance the S/B ratio by a factor of 3.5 at intermediate pT. Au+Au 200GeV (0-80%) STAR Preliminary Full barrel ~ a factor of 10. J. Wu’s talk Section 1.4, Nov.15 In our current analysis, We used kaons from TPC only. STAR Preliminary Au+Au 200GeV (0-80%) Jinhui Chen QM06 Nov.14-20 Shanghai China

Summary and Outlook Reaction plane: within statistics, we have not observed a global polarization for Λ and global spin alignments for  and K*0. Production plane:  and K*0 spin may be slightly aligned in low pT region. No significant difference in  spin alignments, w.r.t. production plane, between p+p and Au+Au collisions have been observed. STAR Full Barrel Time-of-Flight detector upgrade will significantly enhance our capability for a conclusive measurement in the future. Thanks! Jinhui Chen QM06 Nov.14-20 Shanghai China