Wide-acceptance measurement of the <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msup><mi>K</mi><mo>−</mo></msup><mo>/</mo><msup><mi>K</mi><mo>+</mo></msup></mrow></math> ratio from Ni+Ni collisions at <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mn>1.91</mn><mi>A</mi></mrow></math> GeV

FOPI Collaboration; 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; E. Cordier; 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; M. Korolija; R. Kotte; A. Lebedev; Y. Leifels; A. Le Fèvre; J. L. Liu; X. Lopez; A. Mangiarotti; V. Manko; J. Marton; T. Matulewicz; M. Merschmeyer; R. Münzer; D. Pelte; 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; G. Stoicea; K. Suzuki; Z. Tymiński; P. Wagner; I. Weber; E. Widmann; K. Wiśniewski; Z. G. Xiao; H. S. Xu; I. Yushmanov; Y. Zhang; A. Zhilin; V. Zinyuk; J. Zmeskal

doi:10.1103/PhysRevC.99.014904

Wide-acceptance measurement of the $K^{-} / K^{+}$ ratio from Ni+Ni collisions at $1.91 A$ GeV

K. Piasecki^1,*, N. Herrmann², R. Averbeck³, A. Andronic³, V. Barret⁴, Z. Basrak⁵, N. Bastid⁴, M. L. Benabderrahmane², M. Berger^6,7 et al. (FOPI Collaboration)

M. Berger^6,7, P. Buehler⁸, M. Cargnelli⁸, R. Čaplar⁵, E. Cordier², P. Crochet⁴, O. Czerwiakowa^1,†, I. Deppner², P. Dupieux⁴, M. Dželalija⁹, L. Fabbietti^6,7, Z. Fodor¹⁰, P. Gasik^1,6,7, I. Gašparić⁵, Y. Grishkin¹¹, O. N. Hartmann³, K. D. Hildenbrand³, B. Hong¹², T. I. Kang¹², J. Kecskemeti¹⁰, Y. J. Kim³, M. Kirejczyk^1,†, M. Kiš^3,5, P. Koczon³, M. Korolija⁵, R. Kotte¹³, A. Lebedev¹¹, Y. Leifels³, A. Le Fèvre³, J. L. Liu^2,14, X. Lopez⁴, A. Mangiarotti², V. Manko¹⁵, J. Marton⁸, T. Matulewicz¹, M. Merschmeyer², R. Münzer^6,7, D. Pelte², M. Petrovici¹⁶, F. Rami¹⁷, A. Reischl², W. Reisdorf³, M. S. Ryu¹², P. Schmidt⁸, A. Schüttauf³, Z. Seres¹⁰, B. Sikora¹, K. S. Sim¹², V. Simion¹⁶, K. Siwek-Wilczyńska¹, V. Smolyankin¹¹, G. Stoicea¹⁶, K. Suzuki⁸, Z. Tymiński^1,†, P. Wagner¹⁷, I. Weber⁹, E. Widmann⁸, K. Wiśniewski¹, Z. G. Xiao¹⁸, H. S. Xu¹⁹, I. Yushmanov¹⁵, Y. Zhang¹⁹, A. Zhilin¹¹, V. Zinyuk², and J. Zmeskal⁸ (FOPI Collaboration)

¹Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Warsaw, Poland
²Physikalisches Institut der Universität Heidelberg, Heidelberg, Germany
³GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
⁴Laboratoire de Physique Corpusculaire, IN2P3/CNRS, and Université Blaise Pascal, Clermont-Ferrand, France
⁵Ruđer Bošković Institute, Zagreb, Croatia
⁶Excellence Cluster Universe, Technische Universität München, Garching, Germany
⁷E62, Physik Department, Technische Universität München, Garching, Germany
⁸Stefan-Meyer-Institut für Subatomare Physik, Österreichische Akademie der Wissenschaften, Wien, Austria
⁹University of Split, Faculty of Science, Split, Croatia
¹⁰Wigner RCP, RMKI, Budapest, Hungary
¹¹Institute for Theoretical and Experimental Physics, Moscow, Russia
¹²Korea University, Seoul, Korea
¹³Institut für Strahlenphysik, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
¹⁴Harbin Institute of Technology, Harbin, China
¹⁵National Research Centre “Kurchatov Institute”, Moscow, Russia
¹⁶Institute for Nuclear Physics and Engineering, Bucharest, Romania
¹⁷Institut Pluridisciplinaire Hubert Curien and Université de Strasbourg, Strasbourg, France
¹⁸Department of Physics, Tsinghua University, Beijing 100084, China
¹⁹Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China

^*krzysztof.piasecki@fuw.edu.pl
^†Present address: National Centre for Nuclear Research, Otwock, Poland.

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Phys. Rev. C 99, 014904 – Published 15 January, 2019

DOI: https://doi.org/10.1103/PhysRevC.99.014904

Abstract

The FOPI Collaboration at the GSI SIS-18 synchrotron measured charged kaons from central and semicentral collisions of Ni+Ni at a beam energy of $1.91 A$ GeV. We present the distribution of the $K^{-} / K^{+}$ ratio on the energy vs polar angle plane in the nucleon-nucleon center-of-mass frame, with and without subtraction of the contribution of $ϕ (1020)$ meson decays to the $K^{-}$ yield. The acceptance of the current experiment is substantially wider compared to the previous measurement of the same colliding system. The ratio of $K^{-}$ to $K^{+}$ energy spectra is expected to be sensitive to the in-medium modifications of basic kaon properties like mass. Recent results obtained by the HADES Collaboration at $1.23 A$ and $1.76 A$ GeV indicate that after inclusion of the $ϕ$ meson decay contribution to the $K^{-}$ production no difference between the slopes of the $K^{-}$ and $K^{+}$ energy spectra is observed within uncertainties. For our data a linear fit to this ratio obtained after subtraction of the $ϕ$ meson contribution still shows a decrease with kinetic energy, although a constant value cannot be rejected. The contribution of $Λ (1520) \to p K^{-}$ decays estimated from fitting the thermal model to the experimental yields appears to be another factor of moderate relevance.

Physical Review C

Wide-acceptance measurement of the $K^{-} / K^{+}$ ratio from Ni+Ni collisions at $1.91 A$ GeV

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Wide-acceptance measurement of the K−/K+ ratio from Ni+Ni collisions at 1.91A GeV

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Wide-acceptance measurement of the $K^{-} / K^{+}$ ratio from Ni+Ni collisions at $1.91 A$ GeV