Energy dependence of kaon-to-proton ratio fluctuations in central Pb + Pb collisions from √sNN = 6.3 to 17.3 GeV

(NA49 Collaboration) Anticic, T.; Baatar, B.; Barna, D.; Bartke, J.; Beck, H.; Betev, L.; Bialkowska, H.; Blume, C.; Bogusz, M.; Boimska, B.; Book, J.; Botje, M.; Buncic, P.; Cetner, T.; Christakoglou, P.; Chung, P.; Chvala, O.; Cramer, J. G.; Eckardt, V.; Fodor, Z.; Foka, P.; Friese, V.; Gazdzicki, M.; Grebieszkow, K.; Hoehne, C.; Kadija, K.; Karev, A.; Kolesnikov, V. I.; Kollegger, T.; Kowalski, M.; Kresan, D.; Laszlo, A.; Lacey, R.; van Leeuwen, M.; Mackowiak, M.; Makariev, M.; Malakhov, A. I.; Mateev, M.; Melkumov, G. L.; Mitrovski, M.; Mrowczynski, St.; Nicolic, V.; Palla, G.; Panagiotou, A. D.; Peryt, W.; Pluta, J.; Prindle, D.; Puehlhofer, F.; Renfordt, R.; Roland, C.; Roland, G.; Rybczynski, M.; Rybicki, A.; Sandoval, A.; Schmitz, N.; Schuster, T.; Seyboth, P.; Sikler, F.; Skrzypczak, E.; Slodkowski, M.; Stefanek, G.; Stock, R.; Stroebele, H.; Susa, T.; Szuba, M.; Utvic, M.; Varga, D.; Vassiliou, M.; Veres, G. I.; Vesztergombi, G.; Vranic, D.; Wlodarczyk, Z.; Wojtaszek-Szwarc, A.; 2 ] (2011) Energy dependence of kaon-to-proton ratio fluctuations in central Pb + Pb collisions from √sNN = 6.3 to 17.3 GeV. Physical Review C, 83 (6). 061902/1-061902/5. ISSN 0556-2813

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Abstract

Kaons and protons carry large parts of two conserved quantities: strangeness and baryon number. It is argued that their correlation and thus also fluctuations are sensitive to conditions prevailing at the anticipated parton-hadron phase boundary. Fluctuations of the (K++ K−)/(p + ¯p) and K+/p ratios have been measured for the first time by NA49 in central Pb + Pb collisions at five CERN Super Proton Synchrotron energies between √sNN = 6.3 and √sNN = 17.3 GeV. Both ratios exhibit a change of sign in σdyn, a measure of nonstatistical fluctuations, around √sNN = 8 GeV. Below this energy, σdyn is positive, indicating higher fluctuation compared to a mixed event background sample, while for higher energies, σdyn is negative, indicating correlated emission of kaons and protons. The results are compared to hadronic transport model calculations which fail to reproduce the energy dependence.

Item Type:	Article
Uncontrolled Keywords:	CERN; SPS; NA49; Pb+Pb; kaon-to-proton ratio; fluctuation; energy dependence
Subjects:	NATURAL SCIENCES > Physics
Divisions:	Division of Experimental Physics
Projects:	Project title Project leader Project code Project type Experimental physics at LHC energies (Eksperimentalna fizika na LHC energijama)- Krešo Kadija 098-0982887-2878 MZOS
Depositing User:	Tome Antičić
Date Deposited:	26 Feb 2016 14:38
URI:	http://fulir.irb.hr/id/eprint/2549
DOI:	10.1103/PhysRevC.83.061902

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