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Yale RHIG High p T Contributions

Yale RHIG High p T Contributions. Boris Hippolyte: 1 st year postdoc Jon Gans: 5 th year grad Michael Miller: 5 th year grad Oana Catu : 2 nd year grad Christine Nattrass: beginning grad John Harris: Physics Leader. What we’re doing now: Physics.

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Yale RHIG High p T Contributions

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  1. Yale RHIG High pT Contributions Boris Hippolyte: 1st year postdoc Jon Gans: 5th year grad Michael Miller: 5th year grad Oana Catu : 2nd year grad Christine Nattrass: beginning grad John Harris: Physics Leader

  2. What we’re doing now:Physics Yale RHIG primary authored high pT papers • C. Adler et al.: Multiplicity distribution and spectra of negatively charged hadrons in Au+Au collisions at sqrt(s_NN)=130 GeV; Phys. Rev. Lett. (87), 112303 (2001) • C. Adler et al.: Centrality Dependence of High pT Hadron Suppression in Au+Au collisions at sqrt(s_NN)=130 GeV; Phys. Rev. Lett. 89, 202301 (2002) nucl-ex/0206011. • C. Adler et al.: Disappearance of back-to-back high pT hadron correlations in central Au+Au collisions at sqrt(s_NN)=200 GeV; Phys. Rev. Lett. 90, 082302 (2003) • J. Adams et al: Evidence from d+Au measurements for final-state suppression of high pT hadrons in Au+Au collisions at RHIC; Phys. Rev. Lett. 91, 072304 (2003) • J. Adams et al., Transverse momentum and collision energy dependence of high pT hadron suppression in Au+Au collisions, submitted to Phys. Rev. Lett. • J. Adams et al., Multi-Strange Baryon Production in Au+Au collisions at sqrt(s_NN)=130 GeV, submitted to Phys. Rev. Lett. • M.L. Miller and R. J. Snellings: Understanding the effect of Geometry Fluctuations on High pT Elliptic Flow Measurements at RHIC; To be submitted to Phy. Rev. Lett. 2002-2003: 11 invited and 5 contributed high-pT presentations (Gans, Hippolyte, Miller)

  3. Why Jets? Energy Loss in Dense Matter Thick plasma (Baier et al.): Gluon Bremsstrahlung Thin plasma (Gyulassy et al.): • Strong dependence of energy loss on gluon density glue: • measure DE measure gluon density at early hot, dense phase Deconfined quarks and gluons

  4. Yale High pT Focus • Identified particle yields: pion, kaon, proton spectra with RICH detector (B. Hippolyte) • Inclusive charged particle yields: h++h- spectra (J. Gans) • 2-particle high pT hadron correlations: jet, di-jet structure and yields (M. Miller, O. Catu, C. Nattrass) • Topological Jet ID: tagged jet, di-jet spectra. (Identified particle) Fragmentation function measurements (all) Show all in 15 minutes? No chance!

  5. Identified Hadron Spectra from RICH Chemical properties: temperature, chemical potential, flow Soft vs. Hard Physics: Sensitive to gg, qg, qq contributions

  6. Identified Hadron Spectra from RICH Chemical properties: temperature, chemical potential, flow Soft vs. Hard Physics: Sensitive to gg, qg, qq contributions

  7. 200 GeV Charged Hadron Spectra • p+p spectrum: first at 200 GeV • High event rate, backgrounds vertexing bias => Problems solved by J. Gans • p+p: absolutely normalized • Methods/solutions applicable in d+Au

  8. Charged RAA: Comparison to Theory No E-Loss E-Loss 1 10-1 • pQCD: • Vitev and Gyulassy, PRL 89, 252301 • XN Wang, to be published (see also nucl-th/0302007 pQCD: good agreement; gluon density ~15 x cold nuclear matter

  9. Charged RdAu: Turning off Final State Jon’s Thesis Cover • No suppression for minimum bias d+Au • No suppression for central d+Au • What’s happening At pT>8 GeV/c? High pT Suppression is a Final State Effect!

  10. First Observation of Jets at RHIC Far Side Near Side Can find this… In this… trigger

  11. Jets In Most Violent Collisions “Near side” jet identical! pp=dAuAuAu Disappearance of away-side jet is a Final State Effect! Jet Quenching Adams et al., Phys.Rev.Lett. (91):072304,2003 Mike’s Thesis Cover Background subtracted

  12. Where are we? Where to go? • Jets at RHIC are now well established, excellent probe of medium • Produce strongly interacting, highly opaque matter • High pT suppression is most likely post-hard scattering phenomenon • Tagged jet fragmentation: • distinguish hadronic vs. partonic E-Loss • Jet triggered data in p+p, d+Au (Oana and Christine in progress)

  13. New global reco software (Miller) RICH Reco (Hippolyte) New V0 reco software (Betty, Caines, Hippolyte) Database and calibrations (Gans) Vertexing software (Gans, Miller) Jet finding software (Miller) SVT Software (Betty, Caines, Salur) SVT hardware (Caines) STAR II Hardware (Smirnov) Forward Tracking upgrade (Smirnov, Miller/MIT) Yale Contributions to STAR High pT Software Hardware

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