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PPG067 Physics Statements

PPG067 Physics Statements. Michael P. McCumber and Barbara Jacak August + September, 2006. Figure 3. rms increases with npart kurtosis decreases rapidly from near- gaussian values away side peak dispacement is consistent with 0 in dAu & peripheral AuAu.

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PPG067 Physics Statements

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  1. PPG067 Physics Statements Michael P. McCumber and Barbara Jacak August + September, 2006

  2. Figure 3 rms increases with npart kurtosis decreases rapidly from near- gaussian values away side peak dispacement is consistent with 0 in dAu & peripheral AuAu. rapidly increases to about 1 rad. Michael P. McCumber & Barbara Jacak

  3. Mechanisms for away-side modification • Mach Cone • Cherenkov Gluon-Radiation • Wake Waves • Medium-induced gluon radiation at large emission angles • Damping of jet by strongly coupled medium (via AdS/CFT) Michael P. McCumber & Barbara Jacak

  4. Mach Cones – Renk & Ruppert hep-ph/0605330 Mach cone survives expansion! Longitudinal flow → better Δφ signal from a Mach Cone Data → large fractional of energy deposited in collective, propagating mode Michael P. McCumber & Barbara Jacak Away Near→

  5. Mach Cones – Chaudhuri & Heinz PRL97, 062301 (2006) hydro simulations: assume lost energy instantaneously thermalized No Mach cone produced Large energy loss scenarios give “splash-back” signal rejected by data Michael P. McCumber & Barbara Jacak

  6. Mach Cones – Jorge & Edward NP A774, 577 (2006) & hep-ph/0511263 • Modified away side peak shape is due to propagation of a sound wave • Speed of sound intermediate between QGP (cs= 0.33) and hadron gas (cs= 0.2) • First order phase transition causes existence of region with cs=0. This would give a reflected wave, and 2nd peak at Df=1.4 rad Michael P. McCumber & Barbara Jacak

  7. Mach Cones – Jorge & Edward hep-ph/0511263 No clear (or even unclear) evidence for second peak in ppg032 result Michael P. McCumber & Barbara Jacak

  8. Run 4 AuAu not here either… (maybe in 0-5% bin?) Michael P. McCumber & Barbara Jacak

  9. Cherenkov – Koch, Majumder, Wang PRL 96,172302 (2006) Cherenkov production has “a strong dependence on the gluon momentum” & will “disappear for high-energy gluons” D values will “gradually” shrink as associated momentum is increased. Not consistent with our data Michael P. McCumber & Barbara Jacak Paul C’s AN

  10. Wake Waves – Ruppert, Muller PL B618, 123 (2005) Excite either a density wave or a plasma collective mode (plasmon) Sub-sonic partons drag along a screening cloud as a wake (the response of plasma to color charge) Super-sonic partons create Mach cone signal If plasma is strongly coupled, high p parton excites plasma oscillations analogous to Cherenkov radiation (but it looks like Mach cone…) Michael P. McCumber & Barbara Jacak

  11. Large angle gluon emission -- Vitev PL B630, 178 (2005) Predicted angles are typically smaller than observed. pT dependence in central collisions (like the data) Average scattering angle decreases with path length This contrasts our centrality dependence! Michael P. McCumber & Barbara Jacak

  12. large angle gluon emission #2 Polosa & Salgado hep-ph/0607295 Vitev does opacity expansion, they use BDMPS Look at symmetric & asymmetric gluon splittings (asym ~ like Vitev) pT trigger ~ pTassociated restrict signal to a small number of splittings Smaller qhat & larger wradiated – gluons more collinear. So effects should disappear at smaller pTassoc at 62 than 200 GeV. can we say anything about this? Michael P. McCumber & Barbara Jacak

  13. AdS/CFT correspondence of gravity in 5D string theory & field theory similar (but not identical) to QCD → field properties in limit of super strong coupling. Friess, et al. (hep-th/0607022) stress tensor →wake of directional emission at p = several times the temperature see also Casalderry &Teaney (nucl-th/0605199) Liu, Rajagopal, Wiedemann (hep-ph/0607062) on qhat Michael P. McCumber & Barbara Jacak

  14. Figure 3 universal curve with Npart! data imply: away side jet splitting is a property of the medium, rather than the specific collision system successful models include strong medium response to jet Michael P. McCumber & Barbara Jacak

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