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arXiv 1008.0232nucl-exhep-exnucl-th
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质子-核碰撞中介质中φ介子宽度的测量

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

A. Polyanskiy, M. Hartmann, Yu. T. Kiselev, E. Ya. Paryev, M. Buescher, D. Chiladze, S. Dymov, A. Dzyuba, R. Gebel, V. Hejny, B. Kaempfer, I. Keshelashvili, V. … 展开作者

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

摘要:

用COSY-ANKE磁谱仪测量了2.83GeV质子与C、Cu、Ag和Au正向碰撞中φ介子的产生。在0.6-1.6 GeV/c的动量范围内,φ介子产生的截面符合A^0.56+/-0.02的目标质量依赖关系。与模型计算的数据的比较表明,在介质中的Φ宽度是约一个数量级大于其自由值。

英文摘要:

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.

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