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Titolo:
The strange border of the QCD phases
Autore:
Kabana, S;
Indirizzi:
Univ Bern, High Energy Phys Lab, CH-3012 Bern, Switzerland Univ Bern Bern Switzerland CH-3012 y Phys Lab, CH-3012 Bern, Switzerland
Titolo Testata:
EUROPEAN PHYSICAL JOURNAL C
fascicolo: 3, volume: 21, anno: 2001,
pagine: 545 - 555
SICI:
1434-6044(200107)21:3<545:TSBOTQ>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
QUARK-GLUON PLASMA; PB-PB COLLISIONS; HEAVY-ION COLLISIONS; PLUS AU REACTIONS; J/PSI SUPPRESSION; ANTIBARYON PRODUCTION; NUCLEAR COLLISIONS; EXCITATION-FUNCTION; PARTICLE-PRODUCTION; TRANSVERSE ENERGY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
88
Recensione:
Indirizzi per estratti:
Indirizzo: Kabana, S Univ Bern, High Energy Phys Lab, CH-3012 Bern, Switzerland Univ Bern Bern Switzerland CH-3012 , CH-3012 Bern, Switzerland
Citazione:
S. Kabana, "The strange border of the QCD phases", EUR PHY J C, 21(3), 2001, pp. 545-555

Abstract

We address the flavour composition along the border between the hadronic and the quark-gluon plasma phases of QCD. The ratio of strange to up and down antiquarks (lambda (s)) produced in particle and nuclear collisions is found to increase in collisions with an initially reached energy density (epsilon (i)) up to epsilon (crit) similar to 1 GeV/fm(3). Above this value it decreases approximately linearly and reaches its asymptotic value at zero baryon chemical potential (PB). We demonstrate that lambda (s) in nuclear collisions approaches its asymptotic value at epsilon (i) similar to 8-9 GeV/fm(3), corresponding to s(1/2) similar to 3-8 TeV per nucleon + nucleon pair, which will be reached at the LHC. After correcting for the difference inthe chemical potentials of various colliding systems, lambda (s) universally saturates across the QCD phase boundary, following the temperature. Recent experimental puzzles as the increase in the K+/pi (+) ratio in Pb + Pb collisions at 40 GeV per nucleon, its different behaviour at midrapidity, the decrease of the double ratio of K/pi (A+A/p+p) in nucleus-nucleus over p+p collisions with increasing s(1/2), and the increase of lambda (s) in p+A over p+p collisions at the same s(1/2) are naturally explained. We study the approach of thermodynamic observables at mu (B) = 0 to the transition point and extract an estimate of the critical temperature.

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Documento generato il 02/04/20 alle ore 21:19:28