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Sub-threshold φ-meson yield in central 58Ni+58Ni collisions

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Title: Sub-threshold φ-meson yield in central 58Ni+58Ni collisions
Authors: Mangiarotti, A.1 mangiaro@fi.infn.it, Herrmann, N.2, Maurenzig, P.R.1, Gobbi, A.3, Kotte, R.4, Kecskemeti, J.5, Leifels, Y.3, Alard, J.P.6, Andronic, A.3, Averbeck, R.3, Barret, V.6, Basrak, Z.7, Bastid, N.6, Belyaev, I.8, Bendarag, A.6, Berek, G.5, Čaplar, R.7, Crochet, P.6, Devismes, A.3, Dupieux, P.6
Source: Nuclear Physics A. Feb2003, Vol. 714 Issue 1/2, p89. 35p.
Subjects: Heavy ion collisions, Mesons
Abstract: The φ-meson production cross section is measured for the first time at a sub-threshold energy of 1.93 A GeV in 58Ni+58Ni central collisions. The φ data were obtained within the acceptance of the CDC/Barrel subsystem of FOPI. For a sample of 4.7×106 central events, after background subtraction, 23 candidates were observed. Extensive GEANT simulations of the detector performance are shown in a thorough comparison to the real response, aiming at a good understanding of the apparatus and at a trustable determination of the efficiencies, production probability and possible systematic errors. A filter procedure is elaborated, which is meant to facilitate the comparison of any theoretical calculation or new data with the current ones. How to extrapolate the present value to a φ-meson cross section in 4π is also discussed. This result on pseudo-vector mesons can now be compared to existing experimental knowledge for the same reaction at the same incident energy for various outgoing channels, K+ and K− included. A significant fraction (at least 20%) of the K−-mesons is originating in the decay of the φ, supporting the statement that the two channels are strongly correlated. [Copyright &y& Elsevier]
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Database: Engineering Source
Description
Abstract:The <f>φ</f>-meson production cross section is measured for the first time at a sub-threshold energy of <f>1.93</f> <f>A</f> GeV in <f>58Ni+58Ni</f> central collisions. The <f>φ</f> data were obtained within the acceptance of the CDC/Barrel subsystem of FOPI. For a sample of <f>4.7×106</f> central events, after background subtraction, <f>23</f> candidates were observed. Extensive GEANT simulations of the detector performance are shown in a thorough comparison to the real response, aiming at a good understanding of the apparatus and at a trustable determination of the efficiencies, production probability and possible systematic errors. A filter procedure is elaborated, which is meant to facilitate the comparison of any theoretical calculation or new data with the current ones. How to extrapolate the present value to a <f>φ</f>-meson cross section in <f>4π</f> is also discussed. This result on pseudo-vector mesons can now be compared to existing experimental knowledge for the same reaction at the same incident energy for various outgoing channels, <f>K+</f> and <f>K−</f> included. A significant fraction (at least <f>20%</f>) of the <f>K−</f>-mesons is originating in the decay of the <f>φ</f>, supporting the statement that the two channels are strongly correlated. [Copyright &y& Elsevier]
ISSN:03759474
DOI:10.1016/S0375-9474(02)01366-0