scholarly journals Event-by-event fluctuations in a perturbative QCD + saturation + hydrodynamics model: Determining QCD matter shear viscosity in ultrarelativistic heavy-ion collisions

2016 ◽  
Vol 93 (2) ◽  
Author(s):  
H. Niemi ◽  
K. J. Eskola ◽  
R. Paatelainen
Keyword(s):  
Perturbative Qcd ◽  
Shear Viscosity ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Ion Collisions ◽  
Ultrarelativistic Heavy Ion Collisions

scholarly journals ON ANGULAR ORDERING IN MEDIUM-INDUCED RADIATION

2011 ◽  
Vol 20 (07) ◽  
pp. 1600-1604
Author(s):  
KONRAD TYWONIUK
Keyword(s):  
Perturbative Qcd ◽  
First Principles ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Differential Spectrum ◽  
Opening Angle ◽  
Gluon Emission ◽  
Collinear Singularity ◽  
Ion Collisions ◽  
Jet Observables

As an attempt to understand color coherence effects in medium from first principles, we calculate the double differential spectrum of medium-induced gluon emission off a quark–antiquark antenna in the framework of perturbative QCD. Within this setup we find a soft singularity, analogous to the vacuum spectrum, yet, as opposed to the vacuum, the collinear singularity is regulated by the pair opening angle, leading to a strict anti-angular ordering. We comment on the possible consequences of this new contribution for reconstructed jet observables in heavy-ion collisions.

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