/ Experiment-HEP arXiv:1008.0232


Measurement of the in-medium phi-meson width in proton-nucleus collisions


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

Published in: Phys.Lett.
Year: 2011
Vol.: B695
Page No: 74-77
Pages: 8

Abstract: The production of phi mesons in the collisions of 2.83 GeV protons with C, Cu, Ag, and Au at forward angles has been measured via the phi -> K+K- decay using the COSY-ANKE magnetic spectrometer. The phi meson production cross section follows a target mass dependence of A^0.56+/-0.02 in the momentum region of 0.6-1.6 GeV/c. The comparison of the data with model calculations suggests that the in-medium phi width is about an order of magnitude larger than its free value.

Keyword(s): phi meson production ; Nuclear medium effects

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