SQM 2004 Summary: SQM, a STAR Qollaboration Meeting

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SQM 2004 SummarySQM, a STAR Qollaboration
Meeting?

• Paul Sorensen
• Lawrence Berkeley National Laboratory

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130 Participants
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• Charm was the centerpiece of the conference.
• Bare charm quark from NLO matches STAR D
  measurements!
• What about hadronization!?

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• STAR measurement in dAu is several sigma above
  NLO pQCD.
• The charm mass used to match the shape of the
  spectrum does worse for the beam energy
  dependence of the cross section.
• Something is not under control maybe charm is
  not massive enough for pQCD

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PHENIX
M. Van Leeuwen

• AuAu electron measurements insensitive so far
  to scaling or suppression.

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F. Laue

• Apparently large D v2 after corrections
• Generated greatest interest of the conference.

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• NLO calculations fail to reproduce pp spectra
  for identified particles why?
• Fragmentation functions are not under control.

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Kaneta
Estienne

• STAR and PHENIX interpretations of phi slopes
  differ.
• The court of popular opinion sided with PHENIX
  because they wanted to see feed-down corrected
  STAR results.

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• CERES dilepton measurement disfavors the NA49
  observation of phis in the lepton channel
• Within overlapping range in Npart , NA60 on ??µµ
  are close to those from NA49 on ? ?KK, but are
  higher than those from NA50 on ? ?µµ

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• Marcus Bleicher v2/ltptgt saturates at ltptgt0.37
• UrQMD cannot reproduce the plateau this may be
  evidence for an initial QGP pressure

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Moronga
Teaney

• Hydro second order terms solve accausality and
  stability problems
• Upper limit on viscosity is even lower than
  predicted minimum advertised by Gyulassy.

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Quark-number scaling

• How would a quark dependence manifest itself in
  v2 if v2 developed in a hadronic phase?
• v2 is developed amongst quarks!
• Isnt v2 a long range correlation?
• ? to develop v2 quarks need to be deconfined
  (over distances greater than hadron length
  scales)!

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Jettiness the odd man out?
Can jettiness be accommodated within the same
picture that explains less suppression of baryon
yields AND a larger baryon v2? The Test can the
baryon/meson correlation structure be traced to
one unique quark/gluon correlation structure
(not is there a structure)?
PHENIX arXivnucl-ex/0408007
PHENIX arXivnucl-ex/0408007
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Jettiness at intermediate pT
Perhaps correlations amongst quarks and gluons
are mapped onto hadron correlations through
recombination.
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Thanks! -Paul Sorensen