Deep sub-threshold phi production in Au plus Au collisions

0488734 - ÚJF 2019 RIV NL eng J - Journal Article
Adamczewski-Musch, J. - Arnold, O. - Behnke, C. - Chlad, Lukáš - Kugler, Andrej - Rodriguez Ramos, Pablo - Sobolev, Yuri, G. - Svoboda, Ondřej - Tlustý, Pavel - Wagner, Vladimír … Total 114 authors
Deep sub-threshold phi production in Au plus Au collisions.
Physics Letters. B. Roč. 778, č. 3 (2018), s. 403-407. ISSN 0370-2693. E-ISSN 1873-2445
R&D Projects: GA ČR GA13-06759S; GA MŠMT LM2015049
Institutional support: RVO:61389005
Keywords : heavy ion collisions * antikaon production * meson production
OECD category: Nuclear physics
Impact factor: 4.162, year: 2018

We present data on charged kaons (K-+/-) and phi mesons in Au(1.23AGeV)+ Au collisions. It is the first simultaneous measurement of K- and phi mesons in central heavy-ion collisions below a kinetic beam energy of 10AGeV. The phi/K- multiplicity ratio is found to be surprisingly high with a value of 0.52 +/- 0.16and shows no dependence on the centrality of the collision. Consequently, the different slopes of the K+ and K- transverse-mass spectra can be explained solely by feed-down, which substantially softens the spectra of K- mesons. Hence, in contrast to the commonly adapted argumentation in literature, the different slopes do not necessarily imply diverging freeze-out temperatures of K+ and K- mesons caused by different couplings to baryons.
Permanent Link: http://hdl.handle.net/11104/0283276