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arXiv 1505.01992nucl-thnucl-ex
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质子-核碰撞中非共振K介子对的产生和介质效应

Non-resonant kaon pair production and medium effects in proton-nucleus collisions

E. Ya. Paryev, M. Hartmann, Yu. T. Kiselev

摘要:

基于核谱函数,研究了2.83 GeV动能质子在C,Cu,Ag,Au靶上产生$K^+K^-$对的非共振(非$ϕ$)过程.该模型考虑了初始质子和最终K介子的吸收、靶核子的束缚和费米运动以及核平均场势对这些过程的影响。我们计算了在ANKE磁谱仪的接受窗口中的绝对和相对的$K^+K^-$对产量的反K介子动量依赖性,在最近的实验中,在COSY进行,在不同的情况下的反K介子核的光学势。我们证明,上述可观的是强烈敏感的这种潜力。因此,他们可以是有用的,以帮助确定$K^-$的光学势从我们的计算结果与数据的直接比较,从各自的ANKE-在-COSY实验。我们还表明,π-核子生产渠道占主导地位的低动量$K^-$,$K^+$生产所考虑的运动学,因此,他们必须占在这些数据的分析。

英文摘要:

We study the non-resonant (non-$ϕ$) production of $K^+K^-$ pairs by protons of 2.83 GeV kinetic energy on C, Cu, Ag, and Au targets within the collision model, based on the nuclear spectral function, for incoherent primary proton--nucleon and secondary pion--nucleon creation processes. The model takes into account the initial proton and final kaon absorption, target nucleon binding and Fermi motion as well as nuclear mean-field potential effects on these processes. We calculate the antikaon momentum dependences of the exclusive absolute and relative $K^+K^-$ pair yields in the acceptance window of the ANKE magnetic spectrometer, used in a recent experiment performed at COSY, within the different scenarios for the antikaon-nucleus optical potential. We demonstrate that the above observables are strongly sensitive to this potential. Therefore, they can be useful to help determine the $K^-$ optical potential from the direct comparison of the results of our calculations with the data from the respective ANKE-at-COSY experiment. We also show that the pion--nucleon production channels dominate in the low-momentum $K^-$, $K^+$ production in the considered kinematics and, hence, they have to be accounted for in the analysis of these data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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