Münster 2011 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HK: Fachverband Physik der Hadronen und Kerne

HK 65: Schwerionenkollisionen und QCD Phasen IX

HK 65.6: Vortrag

Freitag, 25. März 2011, 15:45–16:00, HS2

Glasma, Flow, and the Ridge in 7 TeV p+p collisions at the LHC — •George Moschelli¹ and Sean Gavin² — ¹Frankfurt Institute for Advanced Studies, Johann Wolfgang Goethe University, Ruth-Moufang-Str. 1, 60438 Frankfurt am Main, Germany — ²Department of Physics and Astronomy, Wayne State University, 666 W Hancock, Detroit, MI, 48202, USA

Two particle correlation measurements in Au+Au collisions at the Relativistic Heavy Ion Collider find excess correlations that extend over causally disconnected rapidity ranges. Although this enhancement is broad in relative rapidity, η = η1 - η2, it is focused in a narrow region in relative azimuthal angle, φ = φ1 - φ2. The resulting structure looks like a ridge centred at η = φ = 0. The long range rapidity behaviour requires that the correlation originates in the earliest stage of the collision and probes properties of the production mechanism. Glasma initial conditions, predicted by the theory of Color Glass Condensate, provide an early stage correlation that naturally extends far in rapidity. We have previously shown that the ridge is a consequence of particles forming from an initial Glasma phase that experience a later stage transverse flow. The CMS experiment has measured a similar ridge structure in high multiplicity p+p collisions at the Large Hadron Collider. We examine this new data in the context of our model.