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Momentum dependence of pion-inducedφmeson production on nuclei near threshold

Momentum dependence of pion-induced φ meson production on nuclei near threshold

作     者:E.Ya.Paryev 

作者机构:Institute for Nuclear ResearchRussian Academy of SciencesMoscow 117312Russia Institute for Theoretical and Experimental PhysicsMoscow 117218Russia 

出 版 物:《Chinese Physics C》 (中国物理C(英文版))

年 卷 期:2018年第42卷第8期

页      面:108-120页

核心收录:

学科分类:07[理学] 0702[理学-物理学] 

主  题:in-medium effects φ absorption pion-nucleus reactions 

摘      要:We study the near-threshold pion-induced production ofφmesons off nuclei in the kinematical conditions of the HADES experiment,recently performed at *** calculations have been performed within a collision model based on the nuclear spectral *** model accounts for both the primaryπ^-meson–protonπ^-p→φn and the secondary pion–nucleonπN→φNφproduction processes as well as the effects of the nuclearφand nucleon mean-field *** find that the primary reaction channelπ^-p→φn dominates in theφproduction off 12C and^(184)W target nuclei in the HADES acceptance window at incident pion momentum of 1.7 Ge V/*** calculate the momentum dependence of the absolute and relative(transparency ratio)φmeson yields from the above direct *** calculations have been performed for this initial pion momentum allowing for different options for theφN absorption cross sectionσ(φN )and different scenarios for the in-medium mass shifts of theφmeson and secondary neutron,produced together withφin this *** demonstrate that the transparency ratio for theφmesons has,contrary to the absolute cross sections,an insignificant sensitivity to theφmeson and secondary neutron in-medium mass shifts atφmomenta studied in the HADES *** the other hand,we show that there are measurable changes in the transparency ratio due to theφN absorption cross section,which means that such a relative observable can be useful to help determine this cross section from the data taken in the HADES experiment.

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