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23 April 2024

» arxiv » 1412.4493

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Influence of $phi$ mesons on negative kaons in Ni+Ni collisions at 1.91A GeV beam energy
K. Piasecki ; N. Herrmann ; R. Averbeck ; A. Andronic ; V. Barret ; Z. Basrak ; N. Bastid ; M.L. Benabderrahmane ; M. Berger ; P. Buehler ; M. Cargnelli ; R. Čaplar ; P. Crochet ; O. Czerwiakowa ; I. Deppner ; P. Dupieux ; M. Dželalija ; L. Fabbietti ; Z. Fodor ; P. Gasik ; I. Gašparić ; Y. Grishkin ; O.N. Hartmann ; K.D. Hildenbrand ; B. Hong ; T.I. Kang ; J. Kecskemeti ; Y.J. Kim ; M. Kirejczyk ; M. Kiš ; P. Koczon ; R. Kotte ; A. Lebedev ; Y. Leifels ; A. Le Fèvre ; J.L. Liu ; X. Lopez ; V. Manko ; J. Marton ; T. Matulewicz ; R. Münzer ; M. Petrovici ; F. Rami ; A. Reischl ; W. Reisdorf ; M.S. Ryu ; P. Schmidt ; A. Schüttauf ; Z. Seres ; B. Sikora ; K.S. Sim ; V. Simion ; K. Siwek-Wilczyńska ; V. Smolyankin ; K. Suzuki ; Z. Tymiński ; P. Wagner ; I. Weber ; E. Widmann ; K. Wiśniewski ; Z.G. Xiao ; I. Yushmanov ; Y. Zhang ; A. Zhilin ; V. Zinyuk ; J. Zmeskal ;
Date:	15 Dec 2014
Abstract:	$phi$ and K$^-$ mesons from Ni+Ni collisions at the beam energy of 1.91A GeV have been measured by the FOPI spectrometer, with a trigger selecting central and semi-central events amounting to 51% of the total cross section. The phase space distributions, and the total yield of K$^-$, as well as the kinetic energy distribution and the total yield of $phi$ mesons are presented. The $phi$K$^-$ ratio is found to be $0.44 pm 0.07( ext{stat}) ^{+0.18}_{-0.12} ( ext{syst})$, meaning that about 22% of K$^-$ mesons originate from the decays of $phi$ mesons, occurring mostly in vacuum. The inverse slopes of direct kaons are up to about 15 MeV larger than the ones extracted within the one-source model, signalling that a considerable share of gap between the slopes of K$^+$ and K$^-$ could be explained by the contribution of $phi$ mesons to negative kaons.
Source:	arXiv, 1412.4493
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