/ Theory-Nucl

Width of the phi meson in nuclear matter

Polyanskiy, A.Yu. (JCHP, Julich) ; Hartmann, M. (JCHP, Julich) ; Kiselev, Yu.T. (Moscow, ITEP) ; Paryev, E.Ya. (Moscow, INR) ; Buscher, M. (JCHP, Julich) ; Chiladze, D. (Tbilisi State U.) ; Dymov, S.N. (Dubna, JINR) ; Dzyuba, A.A. (St. Petersburg, INP) ; Gebel, R. (JCHP, Julich) ; Hejny, V. (JCHP, Julich) ; Kampfer, B. (Forschungszentrum Dresden Rossendorf) ; Keshelashvili, I. (Basel U.) ; Koptev, V.P. (St. Petersburg, INP) ; Lorentz, B. (JCHP, Julich) ; Maeda, Y. (Osaka U., Res. Ctr. Nucl. Phys.) ; Merzliakov, S.I. (Dubna, JINR) ; Mikirtytchiants, S.M. (St. Petersburg, INP) ; Nekipelov, M.E. (JCHP, Julich) ; Ohm, H. (JCHP, Julich) ; Schade, H. (Forschungszentrum Dresden Rossendorf) ; Serdyuk, V.Z. (Dubna, JINR) ; Sibirtsev, A.A. (Jefferson Lab) ; Sinitsyna, V.Yu. (Lebedev Inst.) ; Stein, H.J. (JCHP, Julich) ; Stroher, H. (JCHP, Julich) ; Trusov, S.V. (SINP, Moscow) ; Valdau, Yu.V. (St. Petersburg, INP) ; Wilkin, C. (University Coll. London) ; Wustner, P. (ZEL, Julich)

Published in: Phys.Atom.Nucl. / Yad.Fiz.
Year: 2012 / 2012
Vol.: 75 / 75
Page No: 63-75 / 100-111
Pages: 12

Abstract: The ratios of the cross sections for I -meson production induced by 2.83-GeV protons on Cu, Ag, and Au nuclei to the respective cross section for C nuclei were measured at the ANKE-COSY facility in the momentum range of 0.6-1.6 GeV/c and the angular range of 0 -8 . The product I mesons were identified by their decay I -> K (+) K (-'). The procedure used to separate kaon pairs was described in detail, and all sources of the background and their contribution to the resulting error in the values found for the above cross-section ratios were analyzed. The A dependence of the cross section for I -meson production was shown to obey the A (0.56+-0.03) law. The total width of the I meson at a normal nuclear density was extracted from a comparison of the measured cross-section ratios with the results of calculations based on two theoretical models. The resulting width value exceeds substantially both the vacuum width and the width expected in the absence of the nuclear-matter effect on the properties of the I meson.

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DOI: 10.1134/S1063778811120088
 Record created 2012-05-22, last modified 2014-01-30

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