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ALICE-USA Collaboration Meeting

ALICE-USA Collaboration Meeting. Jet Quenching: From RHIC to LHC. Xin-Nian Wang Lawrence Berkeley National Laboratory. pQCD Analysis of Jet Quenching. Parton distr. in nuclei & p T broadening. Modified Frag. Fun. Hard vs soft radiation. q. Q 2 >k T 2 >Q 0 2. k T 2 <Q 0 2.

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ALICE-USA Collaboration Meeting

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  1. ALICE-USA Collaboration Meeting Jet Quenching: From RHIC to LHC Xin-Nian Wang Lawrence Berkeley National Laboratory

  2. pQCD Analysis of Jet Quenching Parton distr. in nuclei & pT broadening Modified Frag. Fun.

  3. Hard vs soft radiation q Q2 >kT2>Q02 kT2<Q02 non-perturbative perturbative Dynamic “string tension”: <kT>~1/rh Hadronization time: D meson can be formed very early

  4. Modified Fragmentation DGLAP time: ?

  5. Sensitivity of RAA • Cronin effect • Slope of the jet • spectra • E-dependence of • the energy loss

  6. Effect of non-Abelian energy loss Eskola Honkanen Salgado Wiedemann Q. Wang & XNW nucl-th/0410079 pT=6 GeV DEg=DEq DEg=2DEq q=0.9 0.1

  7. Back-2-back Dihadron Correlations  = STAR preliminary Pedestal&flow subtracted Majestero ET XNW, PLB595(04)165.

  8. Hadron Trigger Bias Trigger hadron Trigger hadron No apparent reason why IAA(pT) should be similar to RAA(pT)

  9. Photon Trigger IAA should behavior like RAA, take into account underlying jet spectra trigger g trigger g associated hadron associated hadron

  10. Photon-tagged jets g-jet Events XNW, Huang & Sarcevic,PRL77(96)231 • No-trigger bias • Initial energy • Surface emission • Correlation background due to v2 assoc hadron

  11. Hadron versus photon trigger  = STAR preliminary Majestero Dependence on pTtrig

  12. Some practical remarks Background, background and background • Same-side correlation • Correlation with reaction plane • Mixing direct g and jetsp0 g

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