17-24 July 2013
KTH and Stockholm University Campus
Europe/Stockholm timezone

Onset of deconfinement and search for the critical point of strongly interacting matter at CERN SPS energies

18 Jul 2013, 16:46
E2 (KTH Campus)


KTH Campus

Talk presentation Ultrarelativistic Heavy Ions Ultrarelativistic Heavy Ions


Maciej Rybczynski (Jan Kochanowski University (PL))


The exploration of the QCD phase diagram and particularly the search for a phase transition from hadronic to partonic degrees of freedom and possibly a critical endpoint, is one of the most challenging tasks in present heavy-ion physics. As observed by the NA49 experiment, several hadronic observables in central Pb+Pb collisions at the CERN SPS show qualitative changes in their energy dependence. These features are not observed in elementary interactions and indicate the onset of a phase transition in the SPS energy range [1,2]. Further information about the existence and nature of a phase transition in the SPS energy range can be gained from the studies of event-by-event fluctuations of final state hadron distributions and yields performed by the NA61/SHINE [3], a successor of the NA49 experiment. New results on p+p interactions at 20, 31, 40, 80 and 158 GeV/c will be shown. They will include: - inclusive spectra of pi+, pi-, K-, and protons as a function of transverse momentum/mass and rapidity, - event-by-event fluctuations of transverse momentum, azimuthal angle and chemical composition. The new NA61 data will be compared with the corresponding results of NA49 on central Pb+Pb collisions as well as with the predictions of Monte Carlo models. The NA61/SHINE future plans will be presented. [1] C. Alt et al., Phys. Rev. C 77 (2008) 024903 [2] M. Gazdzicki et al., J. Phys. G 30 (2004) S701 [3] N.Antoniou et al. [NA61/SHINE Collaboration], CERN SPSC-2007-019, (2007).

Primary author

Maciej Rybczynski (Jan Kochanowski University (PL))

Presentation Materials