Prof. Michal Praszalowicz (UJ): Scaling properties of direct photon in heavy ion collisions

Friday Apr 3, 2020, 10:15 AM → 11:00 AM Europe/Warsaw

Abstract:

A recent analysis from the PHENIX collaboration on direct photon  production has shown a universal, within experimental uncertainties, multiplicity scaling, in which photon pT-spectra for transverse momenta up to 2 GeV/c  are scaled with charged hadron pseudorapidity density at midrapidity raised to power alpha=1.25. On the other hand particle production in hadron and nucleus collisions, photons included, exhibits geometrical scaling in a similar pT range. Geometrical scaling follows from gluon saturation and collision geometry. We show how these two scaling laws are interconnected and discuss physical conditions needed to relate one to another.  

Important: This seminar is remote only due to the COVID-19 regulations

Link: https://speakapp.link/to/Uh3PDw

03042020-MichalPraszalowicz-PhotonScaling.pdf