Virtual Journal on QCD Matter

On September 21st 2010 the CMS Collaboration gave a seminar at CERN detailing the observation of long-range near-side angular correlations in p+p collisions at the LHC. A preprint was submitted to arXiv the same day:

Observation of Long-Range Near-Side Angular Correlations in Proton-Proton Collisions at the LHC

The significance of these two particle correlations in azimuthal angle and pseudo-rapidity space is that they are thought to be the result of a collective, hydrodynamic, response of a medium to fluctuations of a multi-particle initial state. The medium in question of course most likely being a Quark-Gluon-Plasma. (more…)

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The 21st International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, colloquially referred to as Quark Matter 2009, took place in Knoxville, Tennessee from March 30th to April 4th, 2009. (more…)

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Over the past few months a new initiative, called Theory-Experiment Collaboration for Hot QCD Matter (TECHQM), has taken shape, which potentially will have great impact on how our community arrives at scientific conclusions on the nature and properties of hot and dense QCD matter created at the RHIC and LHC facilities. (more…)

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The discovery of the “ridge” by the STAR Collaboration has proven stubbornly resistant to quantitative theoretical analysis. (See Berndt Mueller’s “Theorists Confront the Ridge” for a description of two recent attempts.) The discovery turns out to be nearly as resistant to historical analysis, at least for this outside observer. (more…)

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The one that started it all was the first experimental paper from RHIC. (more…)

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