URL: https://physikseminar.desy.de/zeuthen/past_colloquia/colloquia_in_2013/june_11_2013/@@siteview
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The Ridge at RHIC and the LHC - Special seminar!
Peter Steinberg (Brookhaven National Laboratory)
Seminar room 3, 14:00 h
The "ridge" is two particle correlation structure which is extended in pseudorapidity but apparently localized in azimuthal angle. It has been observed by a experiments both at RHIC (the Relativistic Heavy Ion Collider at Brookhaven) and at the LHC (the Large Hadron Collider at CERN), in systems ranging from proton-proton to central nucleus-nucleus collisions. While debate continues over the physical mechanism leading to this effect, the recent data from proton-nucleus collisions at the LHC now suggest that the ridge should no longer be seen as localized in phi, but as an overall modulation of charged particle production over the full azimuthal range.
This seminar will review the original measurements at RHIC, how its interpretation changed with more extensive measurements of correlations at the LHC, and the most recent measurements from RHIC and the LHC, with comparison to model calculations. Further attempts to establish experimentally the importance of final-state collective expansion, in systems usually seen as too small to sustain them, will also be discussed.
