Effects of minijets on hadronic spectra and azimuthal harmonics in Au-Au collisions at 200 GeV
Effects of minijets on hadronic spectra and azimuthal harmonics in Au-Au collisions at 200 GeV
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200 GeV Au-Au 碰撞中微型射流对强子能谱和方位谐波的影响
DOI：
10.1103/physrevc.86.024901
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发表时间：
2012-05
影响因子：
3.1
通讯作者：
Lilin Zhu
中科院分区：
文献类型：
--
作者：
Rudolph C. Hwa;Lilin Zhu
本文在复合模型下研究了RHIC低横动量区重离子碰撞中强子的产生，着重讨论了微喷注对方位各向异性的影响。由于目前的研究主要集中在部分子的强子化上，因此没有使用流体图像来追踪系统的演化。在低p_T$时的包含分布被确定为热部分子的复合产物。π介子和质子的$p_T$依赖性除了其他不同的运动学和共振因子外，还有一个共同的指数因子，因为它们都继承自同一个热部分子库。而不是通常的描述流体力学的基础上，方位角各向异性的产生强子被解释为微型射流的影响的后果，无论是间接通过增强的热部分子在附近的半硬部分子的轨迹的重组，或直接通过热簇射重组。虽然我们的调查是集中在单粒子分布在中快度，我们给出的原因，为什么在该分布中的一个组件可以确定的脊，这与二次谐波$v_2$是由于半硬部分子创建的介质表面附近，导致可计算的各向异性在$\phi$。它表明，高方位谐波，$v_n$，也可以很好地再现，而不参考流。高次谐波的$p_T$和中心依赖性由TT和TS重组分量之间的相互作用规定。这种从传统的方法大大背离成功的影响进行了讨论。
The production of hadrons in heavy-ion collisions at RHIC in the low transverse-momentum ($p_T$) region is investigated in the recombination model with emphasis on the effects of minijets on the azimuthal anisotropy. Since the study is mainly on the hadronization of partons at late time, the fluid picture is not used to trace the evolution of the system. The inclusive distributions at low $p_T$ are determined as the recombination products of thermal partons. The $p_T$ dependencies of both pion and proton have a common exponential factor apart from other dissimilar kinematic and resonance factors, because they are inherited from the same pool of thermal partons. Instead of the usual description based on hydrodynamics, the azimuthal anisotropy of the produced hadrons is explained as the consequence of the effects of minijets, either indirectly through the recombination of enhanced thermal partons in the vicinity of the trajectories of the semihard partons, or directly through thermal-shower recombination. Although our investigation is focussed on the single-particle distribution at midrapidity, we give reasons why a component in that distribution can be identified with the ridge, which together with the second harmonic $v_2$ is due to the semihard partons created near the medium surface that lead to calculable anisotropy in $\phi$. It is shown that the higher azimuthal harmonics, $v_n$, can also be well reproduced without reference to flow. The $p_T$ and centrality dependencies of the higher harmonics are prescribed by the interplay between TT and TS recombination components. The implication of the success of this drastic departure from the conventional approach is discussed.
DOI：
10.1142/5029
发表时间：
2004
期刊：
--
影响因子：
--
作者：
R. Hwa;Xin-Nian Wang
通讯作者：
R. Hwa;Xin-Nian Wang
DOI：
10.1142/7588
发表时间：
2010-02
期刊：
--
影响因子：
--
作者：
R. Hwa;Xin-Nian Wang
通讯作者：
R. Hwa;Xin-Nian Wang