Speaker: Prof,Johanna Stachel (eidelberg University)
Time: 10:30-12:00AM,Monday,September 1,2025
Location: Lecture Hal19-557

Abstract:
In collisions of heavy nuclei a laree fraction of the kinetic enery is disipated into the creation of a hot freball of gluons and quarks, Experimental data allouto estimate the initial temperature and energy density and both a wellabove the expected values for the transition between hadronic matter and the quark-gluonplasma.The fireball expands rapidly and cools thereby.until the (pseudo-)critical temperature for the transition back to normal hadronic matter is reachedObservables will be discused that show the expansion dyamics and their modeling imn terms of relativistic hydrodyamics. Hadronization is describedefiectively and over many orders of masnitude for even very rare species bv statistical mechanics. The parameters goveming the statistical ensemble map oulthe boundary for the chiral phase transition and aeree yery well with the results of state of the art lattice OCD.

Speaker Profile:

Prof Dr Johanna Stachel is a distinguished German physicistrenowned for her contributions to nuclear and particle physics. She earned her Diplom (1978)and ph.D. (1982. summa cum laude) in Phvsics ftom Johannes Gutenberg University MainzCuenly, she serves as senior Professor Distincta at theUniversity of Heidelbere, foowing a long-standims professorship in the Faculty of Physics and Astronomy (196 2024. She has held sienificant leadershirroles including President of the German Physical Society (2012-2014). Proiect Leader of the ALlCE Transition Radiation Detector at CERN. andSpokesperson for multiple intemational reearch collaborations.Her exceptional work has been recoenized with numerous prestigious honors, includins theLise Meitner Prize of the European Physical ociety (2014), the Stem-Gerlach Medal (2019). and the Geran Federal Cross of Merit (lst Class. 2021). She isan elected member of multiple academes, including the Gierman National Academy of Sciences Leopoldina. the Academia Euronaea. and the AmericarAcademy ofArts and Sciences.