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Inclusive spectra and v 2 of charged particles at high p t

Inclusive spectra and v 2 of charged particles at high p t. Kirill Filimonov LBNL for the STAR Collaboration. Outline. Introduction Spectra from central collisions Azimuthal anisotropy Initial gluon density / energy loss. Hard probes at RHIC. leading particle. hadrons. q. q.

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Inclusive spectra and v 2 of charged particles at high p t

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  1. Inclusive spectra and v2 of charged particles at high pt Kirill Filimonov LBNL for the STAR Collaboration Kirill Filimonov, High Pt Phenomena at RHIC, BNL, 11/1/01

  2. Outline Introduction Spectra from central collisions Azimuthal anisotropy Initial gluon density / energy loss Kirill Filimonov, High Pt Phenomena at RHIC, BNL, 11/1/01

  3. Hard probes at RHIC leading particle hadrons q q hadrons leading particle s = 130 (200) AGeV Initial production rate from pQCD • Can be used as a tool to study bulk properties of nuclear matter • partonic energy loss • Observables: spectra (RAA/pp, cent/periph) at high pt • azimuthal anisotropy v2(pt) in non-central collisions Kirill Filimonov, High Pt Phenomena at RHIC, BNL, 11/1/01

  4. Spectra predictions M. Gyulassy, I. Vitev, X.N. Wang, PRL 86 (2001) 2537 X.N.Wang, PRC 61 (2000) 064910 Kirill Filimonov, High Pt Phenomena at RHIC, BNL, 11/1/01

  5. Azimuthal anisotropy v2 Sensitive to initial/final conditions and equation of state (EOS) ! coordinate-space-anisotropy  momentum-space-anisotropy y py px x Kirill Filimonov, High Pt Phenomena at RHIC, BNL, 11/1/01

  6. v2 predictions M. Gyulassy, I. Vitev and X.N. Wang PRL 86 (2001) 2537 1) The value of v2 at high pt sensitive to the initial gluon density! 2) Earlier stages of the evolution Kirill Filimonov, High Pt Phenomena at RHIC, BNL, 11/1/01

  7. v2 on the Lattice! A. Krasnitz, Y. Nara, R. Venugopalan Kirill Filimonov, High Pt Phenomena at RHIC, BNL, 11/1/01

  8. STAR Experiment at RHIC Kirill Filimonov, High Pt Phenomena at RHIC, BNL, 11/1/01

  9. Centrality definition Reconstructed vertex events 5% Central central collisions  nch - number of primary tracks in |h| < 0.75 ~ 90% of all hadronic Au+Au interactions Data Summer 2000  2.0 M total trigger events, 844 K central (top 15%)  331 K good (top 5%) central for physics analysis  458 K good min bias events for physics analysis Kirill Filimonov, High Pt Phenomena at RHIC, BNL, 11/1/01

  10. pt-dependence of central/peripheral Inclusive spectra of charged hadrons Quark Matter’01 pt-dependence of central/peripheral pt-dependence of central/minbias Kirill Filimonov, High Pt Phenomena at RHIC, BNL, 11/1/01

  11. v2 at high pt Quark Matter 01 Preliminary Kirill Filimonov, High Pt Phenomena at RHIC, BNL, 11/1/01

  12. Centrality dependence of v2(pt) Preliminary Kirill Filimonov, High Pt Phenomena at RHIC, BNL, 11/1/01

  13. Summary • Inclusive spectra: At high pt (>2GeV/c), the central AA spectra suppressed compared to pp collisions; • v2 at high pt - at pt>2 GeV/c, v2 saturates up to pt~6 GeV/c; - the value of saturation depends on centrality QCD effects? Energy loss? Gluon saturation? Kirill Filimonov, High Pt Phenomena at RHIC, BNL, 11/1/01

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