Non-Spin * Physics Craig Ogilvie, ISU, [email protected] • high-density QCD • status of saturation at RHIC • intense proton beam as a neutrino source (J.
Download ReportTranscript Non-Spin * Physics Craig Ogilvie, ISU, [email protected] • high-density QCD • status of saturation at RHIC • intense proton beam as a neutrino source (J.
Non-Spin * Physics Craig Ogilvie, ISU, [email protected] • 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 Cold QCD Gluon fields (occupation numbers) become large (Al Muller) but coupling small, perturbative methods Non-linear QCD evolution, new “form” of matter ln(1/x) High-density QCD Dilute parton QCD ln(Q) Cold QCD: New Form of Matter Tuchin Properties ln(1/x) onset? Jalilian-Marian, Baker Armesto BK equ. Ranier Higher-twist Vuzey: DGLAP ln(Q) Organize summary by approaches/attacks on this diagram Exploring Non-Linear Evolution Region Nestor Armesto: Challenge of non-linear evolution Numerical solution of Balitsky-Kovchegov equation: ln(1/x) ln(Q) Nuclear Structure function DGLAP Evolution with Q: Vadim Guzey 10-1 10-1 Cuurrent data does not constrain available nuclearstructure functions sea-quarks, GA Multiple-Interactions: Rainer Fries Final state interaction Scattered quark interacting with nuclear matter. Testing ground for higher-twist Beyond double scattering: triple, .... n-scattering Move from lower to higher Q2 to establish role of higher twist EIC Gluon Distribution: Antje Bruell ln(1/x) Key measurement Across this phase-space nuclear-modification factors GA/Gp low-x and high Q2 High-density QCD “CGC” Dilute parton QCD ln(Q) Gluon structure functions in A - Q2 evolution - open charm via photongluon fusion - Fl (Caldwell) Open charm via D => K p Allen Caldwell FL => GA(x,Q2) d2/dxdQ2=2p2/xQ4[ (1+(1-y)2)F2(x,Q2) - y2FL(x,Q2) ] Fix x, Q2. Use different beam energies to vary y. Critical issue: e/p separation FL can be measured precisely in the region of maximum interest. This will be a strong test of our understanding of QCD radiation. Role of sea quarks at low-x in A: Rolf Ent Strategy: Select Energy Loss n > 50 GeV hadrons with large elasticity z (=Eh/n) to reduce space-time effect complications Use K- and lambda-bar to pick apart nuclear effects on sea quarks? Semi-inclusive DIS: Kirill Turchin Beyond probing structure function – radiation of gluon from parton evolution k e Accesses correlations between gluons in dense QCD Radiation of Gluons d ( * A) 2 d kdy 2 2 RDIS ( x, Q , k ) d ( * p) A 2 d kdy 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 Electron method - standard Raw acceptance: # of positron found # of generated Acceptance: # of reconstructed # of generated barrel – catcher border catcher – endwall border Efficiency: 9 GeV # of generated & reconstructed # of generated 9.9 GeV Purity: # of generated & reconstructed # of reconstructed 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 d+Au @ RHIC Fit DIS => dipole Functional form from saturation model Iancu+Itakura+Munier Use same dipole in dAu collisions @ RHIC RdAu pt Saturation at RHIC: Mark Baker Au+Au – at y ~ 0, high-pt suppression is due to dense matter formed after Au-Au passage – not CGC, possibly QGP d-Au at forward rapidity – Low-x in Au Spectra in d+Au for h>0 Brahms DNP - submitted to PRL G. Veres QM04 (PHOBOS) This could be the CGC!? CAVEAT: Shape not perfect Phenix Brahms Phobos dN/dh dA/pp scaled by 1.4 /(Npart/2) Dominated by low-pt Suppression at moderate pt is the same as low-pt => Challenge to CGC which has stronger suppression at lower pt. Moving forward : Personal View Internal questions: what luminosity and detector do we need? While measurements of GA/Gp are key – Cond. matter, HEP colleagues yawn with structure funcs ln(1/x) High-density QCD Dilute parton QCD ln(Q) “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?