论文标题
$λ$的高能重型离子碰撞和$λ$的指示流量
Directed flow of $Λ$ in high-energy heavy-ion collisions and $Λ$ potential in dense nuclear matter
论文作者
论文摘要
我们调查了$λ$的流量对$ \ sqrt {s_ {nn}} \ oft 3.0 $ - $ 30 $ gev的$λ$导向对$λ$潜力的$λ$潜力。从手性有效场理论（$χ$ eft）获得的$λ$电位用于微观传输模型，这是相对论量子分子动力学（RQMDV）的矢量版本。我们发现，依赖密度的$λ$电势，从$χ$ eft获得，假设电势的动量依赖性较弱，从而重现了$λ$的速度和光束能量依赖性，该$λ$导向了光束能量能量扫描程序中星星协作测量的流量。尽管$λ$定向流对电势的密度依赖性不敏感，但它容易受到动量依赖性的影响。我们还表明，基于Blast-Wave模型的流体动力学图片预测了质子的相似性，$λ$和$ξ$指示的流量，但是$ω$ BARYONS的定向流量与其他Baryons略微偏离。我们还表明，夸克结合预测了Hyperos的定向流量的不同速度依赖性。这些调查表明，测量了Hyperons的定向流动流的广泛速度依赖性可能会提供有关在高能重型离子碰撞中产生的热和密集物质的重要信息。
We investigate the sensitivity of the $Λ$ directed flow to the $Λ$ potential in mid-central Au + Au collisions at $\sqrt{s_{NN}}\approx3.0$--$30$ GeV. The $Λ$ potential obtained from the chiral effective field theory ($χ$EFT) is used in a microscopic transport model, a vector version of relativistic quantum molecular dynamics (RQMDv). We find that the density-dependent $Λ$ potentials, obtained from the $χ$EFT assuming weak momentum dependence of the potential, reproduce the rapidity and the beam-energy dependence of the $Λ$ directed flow measured by the STAR collaboration in the Beam Energy Scan program. Although the $Λ$ directed flow is insensitive to the density dependence of the potential, it is susceptible to the momentum dependence. We also show that a hydrodynamics picture based on the blast-wave model predicts a similarity of the proton, $Λ$, and $Ξ$ directed flows, but the directed flow of $Ω$ baryons slightly deviates from other baryons. We also show that the quark coalescence predicts different rapidity dependence of the directed flows for hyperons. These investigations suggest that measurements of a wide range of the rapidity dependence of the directed flow of hyperons may provide important information about the properties of hot and dense matter created in high-energy heavy-ion collisions.
