论文标题
用$ ϕ $ MESON生产约束AMPT模型的输入参数
Constraining input parameters of AMPT model with $ϕ$ meson production
论文作者
论文摘要
多相传输模型（AMPT）已被广泛用于了解实验观察背后的物理。与其他模型一样，AMPT模型的结果取决于初始参数。因此，在使用模型之前，需要选择合适的初始参数。 Lund String碎片函数已用于在AMPT模型中创建夸克式的对。 Lund字符串碎片参数确定了在核核碰撞中产生的颗粒的产量和横向动量（$ p_ {t} $）。通过拟合带电的颗粒产量和$ p_ {t} $光谱在实验中测得的$ p_ {t} $光谱来确定隆德字符串碎片参数的值。在本文中，我们展示了携带黑龙的奇怪夸克的产量，例如$ ϕ $介子对Lund String碎片参数更为敏感，与非震动亲。使用在RHIC测量的$ ϕ $ MESON光谱，我们在$ \ sqrt {s _ {\ Mathrm {nn}}}} $ = 11.5、39和200 GEV的情况下获得了au+au碰撞的新集合。我们发现，使用相同的参数，我们可以解释$ ϕ $ -Meson的收益$ \ sqrt {s _ {\ Mathrm {nn}}} $ = 39和200 GEV，但是，我们需要$ \ sqrt {s _ _ {\ mathrm mathrm mathrm} $}} $ = sqrt {这表明在低能时，$ \ sqrt {s _ {\ mathrm {nn}}}} $ = 11.5 GEV，与顶部rhic能量相比，粒子产生的基本机制是不同的。我们还预测，在$ \ sqrt {s _ {s _ {\ mathrm {nn}}} $ = 196 GEV的U+U碰撞中，U+U碰撞中的$ p_ {t} $ collisions的不变收益率是$ p_ {t} $的函数。
A Multi-Phase Transport Model (AMPT) has been extensively used to understand the physics behind the experimental observation. Like other models, the outcome of the AMPT model depends on the initial parameters. Therefore, one needs to choose suitable initial parameters before using the model. Lund string fragmentation function has been used to create quark-antiquarks pairs in the AMPT model. The Lund string fragmentation parameters determine the yields and transverse momentum ($p_{T}$) spectra of particles produced in nucleus-nucleus collisions. The values of Lund string fragmentation parameters were determined by fitting the charged particle yield and $p_{T}$ spectra measured in the experiment. In this paper, we have shown the yield of strange quarks carrying hadrons, e.g. $ϕ$ mesons, are more sensitive to Lund string fragmentation parameters compared to non-strange pions. Using $ϕ$ meson spectra measured at RHIC, we have obtained new sets of Lund parameters for Au+Au collisions at $\sqrt{s_{\mathrm {NN}}}$ = 11.5, 39, and 200 GeV. We have found that using the same set of parameters, we can explain $ϕ$-meson yield at $\sqrt{s_{\mathrm {NN}}}$ = 39 and 200 GeV, however, we need a different set of parameters for $\sqrt{s_{\mathrm {NN}}}$ = 11.5 GeV. This suggests that at low energy, $\sqrt{s_{\mathrm {NN}}}$ = 11.5 GeV, the underlying mechanism for particle production is different compared to top RHIC energies. We have also predicted invariant yield of $π$ and $ϕ$ mesons as a function of $p_{T}$ in U+U collisions at $\sqrt{s_{\mathrm {NN}}}$ = 196 GeV to be measured by STAR experiment.
