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arXiv 0802.3987nucl-ex
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Ap，pA和AA碰撞中介质中$ω$介子性质的研究

Study of in-medium $ω$ meson properties in Ap, pA and AA collisions

S. Belogurov, M. Chumakov, S. Kiselev, Yu. Kiselev, V. Sheinkman

备注：
26 pages, 10 figures, 2 tables
发表信息：
Phys.Atom.Nucl.73:150-161,2010
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摘要：

我们计划在ITEP加速器TWAC装置上研究正常核密度下Ap（pA）碰撞和高密度下AA碰撞中矢量$ω$介子的介质内性质。利用逆Ap运动学将使我们能够研究$ω$介子生产在一个广泛的动量间隔，包括尚未探索的范围内的小介子动量相对于弹核的质量修改效应在核物质预计是最强的。在传统的pA运动学中，我们研究了介质中$ω$介子宽度与动量的关系。我们打算用电磁量能器通过探测$ω\to π^{0}γ\to 3γ$衰变的光子来重建$ω$介子不变质量。模型计算和RQMD发生器的仿真表明了该实验的可行性。现有的离子束强度提供了一种可能性，收集大量的统计数据，并作出决定性的结论，$ω$介子的性质在正常的核密度。在第二阶段的调查$ω$介子的性质将研究在AA碰撞在更高的密度。这些测量值的解释将基于Ap（pA）相互作用中获得的结果。在ITEP和GSI（FAIR），在不久的将来将可以获得更高的离子能量，可以进行更进一步的研究轻无味和魅力介子的介质性质。

英文摘要：

We propose to investigate the in-medium properties of vector $ω$ mesons at the normal nuclear density in Ap(pA) collisions and at higher density in AA collisions at the ITEP accelerator facility TWAC. Using of the inverse Ap kinematics will permit us to study the $ω$ meson production in a wide momentum interval included the not yet explored range of small meson momenta relative to the projectile nuclei where the mass modification effect in nuclear matter is expected to be the strongest. Momentum dependence of the in-medium $ω$ meson width will be studied in the traditional pA kinematics. We intend to use the electromagnetic calorimeter for reconstruction of the $ω$ meson invariant mass by detecting photons from the $ω\to π^{0}γ\to 3γ$ decay. The model calculations and simulations with RQMD generator show feasibility of the proposed experiment. Available now intensity of the ion beams provides a possibility to collect large statistics and make decisive conclusion about the $ω$ meson properties at density of normal nuclei. At the second stage of the investigation the $ω$ meson properties will be studied in AA collisions at higher density. Interpretation of these measurements will be based on the results obtained in Ap(pA) interactions. Further investigation of the in-medium properties of light unflavored and charmed mesons can be performed at ITEP and at GSI(FAIR) where higher ion energies will be accessible in near future.

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