Non-Spin Physics * Craig Ogilvie, ISU, high-density QCD status of saturation at RHIC intense proton beam as a neutrino source (J.

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Presentation transcript:

Non-Spin Physics * Craig Ogilvie, ISU, high-density QCD status of saturation at RHIC intense proton beam as a neutrino source (J. Nelson) * disclaimer, thanks to all speakers for the help, all omissions, mistakes my responsibility

ln(Q) ln(1/x) High-density QCD Dilute parton QCD Cold QCD Gluon fields (occupation numbers) become large (Al Muller) but coupling small, perturbative methods Non-linear QCD evolution, new “form” of matter

Organize summary by approaches/attacks on this diagram ln(Q) ln(1/x) Cold QCD: New Form of Matter Tuchin Properties onset? Jalilian-Marian, Baker Vuzey: DGLAP Armesto BK equ. Ranier Higher-twist

Exploring Non-Linear Evolution Region ln(Q) ln(1/x) Nestor Armesto: Challenge of non-linear evolution Numerical solution of Balitsky-Kovchegov equation:

Nuclear Structure function DGLAP Evolution with Q: Vadim Guzey u Cuurrent data does not constrain available nuclear- structure functions sea-quarks, G A 10 -1

Multiple-Interactions: Rainer Fries Move from lower to higher Q 2 to establish role of higher twist Final state interaction Scattered quark interacting with nuclear matter. Testing ground for higher-twist Beyond double scattering: triple,.... n-scattering

EIC Gluon Distribution: Antje Bruell Key measurement Across this phase-space nuclear-modification factors G A /G p low-x and high Q 2 ln(Q) ln(1/x) High-density QCD “CGC” Dilute parton QCD Gluon structure functions in A - Q 2 evolution - open charm via photon- gluon fusion - F l (Caldwell)

Open charm via D => K 

F L can be measured precisely in the region of maximum interest. This will be a strong test of our understanding of QCD radiation. d 2  /dxdQ 2 =2  2 /xQ 4 [ (1+(1-y) 2 )F 2 (x,Q 2 ) - y 2 F L (x,Q 2 ) ] Fix x, Q 2. Use different beam energies to vary y. Critical issue: e/  separation Allen Caldwell F L => G A (x,Q 2 )

Role of sea quarks at low-x in A: Rolf Ent Strategy: Select Energy Loss > 50 GeV hadrons with large elasticity z (=E h / ) to reduce space-time effect complications Use K- and lambda-bar to pick apart nuclear effects on sea quarks?

Semi-inclusive DIS: Kirill Turchin u Beyond probing structure function –radiation of gluon from parton evolution Accesses correlations between gluons in dense QCD k e

Radiation of Gluons

Measuring Structure Functions at eRHIC Joseph Seele Wonderful infrastructure => event generators => simulation => Common output independent of event generator

eRHIC Detector Performance Juraj Sutiak Si tracker + calorimetry

9 GeV9.9 GeV Electron method - standard Raw acceptance:Acceptance: Efficiency:Purity: catcher – endwall border barrel – catcher border

Current Experiment Probes of Saturation Gluon fields (occupation numbers) become large classical =>CGC Jamal Jalilian-Marian can CGC be applied from DIS to d+Au at RHIC ? towards universal properties of condensate

From DIS to RHIC Fit DIS => dipole  Functional form from saturation model Iancu+Itakura+Munier R dAu pt Use same dipole  in dAu RHIC

Saturation at RHIC: Mark Baker u Au+Au –at y ~ 0, high-pt suppression is due to dense matter formed after Au-Au passage –not CGC, possibly QGP u d-Au at forward rapidity –Low-x in Au

Spectra in d+Au for  >0 This could be the CGC!? G. Veres QM04 (PHOBOS) CAVEAT: Shape not perfect Brahms DNP - submitted to PRL

Phenix Brahms Suppression at moderate pt is the same as low-pt => Challenge to CGC which has stronger suppression at lower pt. Phobos dN/d  dA/pp scaled by 1.4 /(N part /2) Dominated by low-pt

Moving forward : Personal View u Internal questions: what luminosity and detector do we need? u While measurements of G A /G p are key –Cond. matter, HEP colleagues yawn with structure funcs ln(Q) ln(1/x) High-density QCD Dilute parton QCD u “Expand” the question to sell the physics - what is unique/similar about non-linear QCD –What qualitatively happens near the boarder regions? –What are the correlations in the condensate? »Links with BEC, correlations in condensed matter?