论文标题
质子和光核的中心性依赖性由于在悬子阶段歼灭而产生的结果
Centrality dependence of proton and light nuclei yields as a consequence of baryon annihilation in the hadronic phase
论文作者
论文摘要
5.02 TEV PB-PB碰撞中，Alice Collaboration测得的$ p/π$比率的中心性依赖性表明，一旦从数据中消除了系统不确定性的中心性相关部分，则带电粒子多重性的增加具有统计学上的显着抑制。我们认为，这种行为可以归因于在习惯阶段的bary灭。 By implementing the $B\bar{B} \leftrightarrow 5π$ reaction within a generalized partial chemical equilibrium framework, we estimate the annihilation freeze-out temperature at different centralities, which decreases with increasing charged multiplicity and yields $T_{\rm ann} = 132 \pm 5$ MeV in 0-5% most central collisions.该值大大低于$ t _ {\ rm具有} \ sim 160 $ MEV的强化温度，但高于$ t _ {\ rm kin} \ sim 100 $ mev的热（动力学）冻结温度。因此，巴里昂歼灭反应在耐药相的初始阶段仍然相关，但在（伪）弹性施加散射之前将其冻结。这张图片的一个实验测试结果是抑制重离子中央碰撞中各种光核与质子比率的抑制。
The centrality dependence of the $p/π$ ratio measured by the ALICE Collaboration in 5.02 TeV Pb-Pb collisions indicates a statistically significant suppression with the increase of the charged particle multiplicity once the centrality-correlated part of the systematic uncertainty is eliminated from the data. We argue that this behavior can be attributed to baryon annihilation in the hadronic phase. By implementing the $B\bar{B} \leftrightarrow 5π$ reaction within a generalized partial chemical equilibrium framework, we estimate the annihilation freeze-out temperature at different centralities, which decreases with increasing charged multiplicity and yields $T_{\rm ann} = 132 \pm 5$ MeV in 0-5% most central collisions. This value is considerably below the hadronization temperature of $T_{\rm had} \sim 160$ MeV but above the thermal (kinetic) freeze-out temperature of $T_{\rm kin} \sim 100$ MeV. Baryon annihilation reactions thus remain relevant in the initial stage of the hadronic phase but freeze out before (pseudo-)elastic hadronic scatterings. One experimentally testable consequence of this picture is a suppression of various light nuclei to proton ratios in central collisions of heavy ions.
