论文标题
$σ（1385）^{\ pm} $共振产生在$ \ sqrt {s _ {\ mathrm {nn}}}} = 5.02 $ tev
$Σ(1385)^{\pm}$ resonance production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
论文作者
论文摘要
HADRONIC共振用于探测重型离子碰撞后期产生的强子气体，因为它们在同一时间尺度上的衰减，即1至10 fm/$ c $，作为系统的解耦时间。在强子气体中，（伪）在动力学冻结和再生过程之前腐烂的共振产物之间的弹性散射相互抵消，取决于共振寿命，耐药阶段的持续时间，以及在玩耍时的强烈交叉部分。在这种情况下，$σ（1385）^{\ pm} $粒子特别感兴趣，因为模型预测，尽管其寿命相对较短，而再生则在撤退中占主导地位。 $σ（1385）^{\ pm} $的第一个测量在$ \ sqrt {s _ {\ mathrm {nn}}} = 5.02 $ tev带有爱丽丝检测器的$ \ sqrt {s _ {s _ {s _ {s _ {s _ {s _ {s _ {s _ {s _ {s _ {s _ {共振是通过其HADRONIC衰减通道（$λπ$）重建的，这是横向动量（$ p _ {\ rm t} $）和碰撞中心性的功能。与培养的培养基产量以及统计强调模型的预期以及常用的事件发生器（包括Pythia8/angantyr和EpoS3）相比，讨论了结果。这些模型都无法描述数据。对于$σ（1385）^{\ pm} $，与$ {\ rm k}^{*}（892）^{0} $相似的行为在数据中观察到与epos3的预测不同。
Hadronic resonances are used to probe the hadron gas produced in the late stage of heavy-ion collisions since they decay on the same timescale, of the order of 1 to 10 fm/$c$, as the decoupling time of the system. In the hadron gas, (pseudo)elastic scatterings among the products of resonances that decayed before the kinetic freeze-out and regeneration processes counteract each other, the net effect depending on the resonance lifetime, the duration of the hadronic phase, and the hadronic cross sections at play. In this context, the $Σ(1385)^{\pm}$ particle is of particular interest as models predict that regeneration dominates over rescattering despite its relatively short lifetime of about 5.5 fm/$c$. The first measurement of the $Σ(1385)^{\pm}$ resonance production at midrapidity in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}= 5.02$ TeV with the ALICE detector is presented in this Letter. The resonances are reconstructed via their hadronic decay channel, $Λπ$, as a function of the transverse momentum ($p_{\rm T}$) and the collision centrality. The results are discussed in comparison with the measured yield of pions and with expectations from the statistical hadronization model as well as commonly employed event generators, including PYTHIA8/Angantyr and EPOS3 coupled to the UrQMD hadronic cascade afterburner. None of the models can describe the data. For $Σ(1385)^{\pm}$, a similar behaviour as ${\rm K}^{*} (892)^{0}$ is observed in data unlike the predictions of EPOS3 with afterburner.
