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

Author:
Polyanskiy, A.  Hartmann, M.  Kiselev, Yu. T.  Paryev, E. Ya.  Buescher, M.  Chiladze, D.  Dymov, S.  Dzyuba, A.  Gebel, R.  Hejny, V.  Kaempfer, B.  Keshelashvili, I.  Koptev, V.  Lorentz, B.  Maeda, Y.  Merzliakov, S.  Mikirtytchiants, S.  Nekipelov, M.  Ohm, H.  Schade, H.  Serdyuk, V.  Sibirtsev, A.  Sinitsyna, V. Y.  Stein, H. J.  Stroeher, H.  Trusov, S.  Valdau, Yu.  Wilkin, C.  Wuestner, P.  


Journal:
PHYSICS LETTERS B


Issue Date:
2011


Abstract(summary):

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 +/- 0.33) 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. (C) 2010 Elsevier B.V. All rights reserved.


Page:
74---77


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