@article{922ba4a80604451eaf289d08b7e6f6f4,
title = "Deep sub-threshold ϕ production in Au+Au collisions",
abstract = "We present data on charged kaons (K±) and ϕ mesons in Au(1.23A GeV)+Au collisions. It is the first simultaneous measurement of K− and ϕ mesons in central heavy-ion collisions below a kinetic beam energy of 10A GeV. The ϕ/K− multiplicity ratio is found to be surprisingly high with a value of 0.52±0.16 and 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.",
author = "{HADES Collaboration} and J. Adamczewski-Musch and O. Arnold and C. Behnke and A. Belounnas and A. Belyaev and Berger-Chen, {J. C.} and J. Biernat and A. Blanco and C. Blume and M. B{\"o}hmer and P. Bordalo and S. Chernenko and L. Chlad and C. Deveaux and J. Dreyer and A. Dybczak and E. Epple and L. Fabbietti and O. Fateev and P. Filip and P. Fonte and C. Franco and J. Friese and I. Fr{\"o}hlich and T. Galatyuk and Garz{\'o}n, {J. A.} and R. Gernh{\"a}user and M. Golubeva and R. Greifenhagen and F. Guber and M. Gumberidze and S. Harabasz and T. Heinz and T. Hennino and S. Hlavac and C. H{\"o}hne and R. Holzmann and A. Ierusalimov and A. Ivashkin and B. K{\"a}mpfer and T. Karavicheva and B. Kardan and I. Koenig and W. Koenig and Kolb, {B. W.} and G. Korcyl and G. Kornakov and R. Kotte and W. K{\"u}hn and A. Kugler",
note = "Publisher Copyright: {\textcopyright} 2018 The Author(s)",
year = "2018",
month = mar,
day = "10",
doi = "10.1016/j.physletb.2018.01.048",
language = "English",
volume = "778",
pages = "403--407",
journal = "Physics Letters B",
issn = "0370-2693",
publisher = "Elsevier B.V.",
}