From Strangeness Enhancement to Quark-Gluon Plasma Discovery∗
August 29, 2017 0:23 ws-rv961x669 Book Title KMR_ForWalterWSHess4B page 1 From Strangeness Enhancement to Quark-Gluon Plasma Discovery∗ Peter Koch1, Berndt M¨uller2 and Johann Rafelski3 1Bitfabrik GmbH & Co. KG, D-63110 Rodgau, Germany 2Department of Physics, Duke University, Durham, NC 27708, USA 3Department of Physics, The University of Arizona, Tucson, AZ 85721, USA This is a short survey of signatures and characteristics of the quark-gluon plasma in the light of experimental results that have been obtained over the past three decades. In particular, we present an in-depth discussion of the strangeness ob- servable, including a chronology of the experimental effort to detect QGP at CERN-SPS, BNL-RHIC, and CERN-LHC. ∗Dedicated to our mentor Walter Greiner; to be published in the memorial volume edited by Peter O. Hess. 1. Introduction Just fifteen years after the coincident creation in 1964 of two great ideas governing the strong interactions | quarks and the Hagedorn temperature TH | these two concepts merged, giving birth to a new discipline, the physics of the novel fifth state of matter, the quark-gluon plasma (QGP). Today there is consensus that QGP filled the cosmos during the first 20 µs after the Big-Bang. For three decades laboratory experiments at the European Center for Particle Physics (CERN) and Brookhaven National Laboratory (BNL) have been exploring this primordial phase of matter colliding nuclei at relativistic energies. As the ideas about QGP formation in relativistic heavy ion collisions matured a practical challenge emerged: How can the locally color deconfined QGP state be distinguished from a gas of confined hadrons? In the period 1979{86 the strangeness signature of QGP was developed for this purpose, with our 1986 review1 in essence arXiv:1708.08115v1 [nucl-th] 27 Aug 2017 completing the theoretical foundations.
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