"Table 4" of "Multi-strange baryon production in p-Pb collisions at $\sqrt{s_\mathbf{NN}}=5.02$"

CERN-LHC. The multi-strange baryon yields in Pb--Pb collisions have been shown to exhibit an enhancement relative to pp reactions. In this work, $\Xi$ and $\Omega$ production rates have been measured with the ALICE experiment as a function of transverse momentum, ${p_{\rm T}}$, in p-Pb collisions at a centre-of-mass energy of ${\sqrt{s_{\rm NN}}}$ = 5.02 TeV. The results cover the kinematic ranges 0.6 GeV/$c<{p_{\rm T}} <$7.2 GeV/$c$ and 0.8 GeV/$c<{p_{\rm T}}<$ 5 GeV/$c$, for $\Xi$ and $\Omega$ respectively, in the common rapidity interval -0.5 $<{y_{\rm CMS}}<$ 0. Multi-strange baryons have been identified by reconstructing their weak decays into charged particles. The ${p_{\rm T}}$ spectra are analysed as a function of event charged-particle multiplicity, which in p-Pb collisions ranges over one order of magnitude and lies between those observed in pp and Pb-Pb collisions. The measured ${p_{\rm T}}$ distributions are compared to the expectations from a Blast-Wave model. The parameters which describe the production of lighter hadron species also describe the hyperon spectra in high multiplicity p-Pb. The yield of hyperons relative to charged pions is studied and compared with results from pp and Pb-Pb collisions. A statistical model is employed, which describes the change in the ratios with volume using a canonical suppression mechanism, in which the small volume causes a species-dependent relative reduction of hadron production. The calculations, in which the magnitude of the effect depends on the strangeness content, show good qualitative agreement with the data.

欧洲核子研究中心大型强子对撞机（CERN-LHC）。铅-铅（Pb-Pb）碰撞中的多奇异重子产额，相较于质子-质子（pp）碰撞反应，已被证实存在显著提升。本研究依托大型离子对撞机实验（ALICE，A Large Ion Collider Experiment），针对质心系能量${sqrt{s_{
m NN}}}=5.02, ext{TeV}$下的质子-铅（p-Pb）碰撞，测量了Ξ和Ω超子的产额随横向动量（$p_{
m T}$）的分布关系。实验结果覆盖的运动学范围为：Ξ超子的$p_{
m T}$区间为$0.6, ext{GeV}/c < p_{
m T} <7.2, ext{GeV}/c$，Ω超子的$p_{
m T}$区间为$0.8, ext{GeV}/c < p_{
m T} <5, ext{GeV}/c$，且所有测量均在公共CMS快度区间$-0.5 < y_{
m CMS} <0$内完成。多奇异重子通过其弱衰变至带电粒子的过程完成重建与识别。本研究将横向动量谱作为事件带电粒子多重数的函数进行分析：p-Pb碰撞中的事件带电粒子多重数覆盖一个数量级的范围，且介于pp碰撞与Pb-Pb碰撞所观测到的多重数区间之内。将测得的$p_{
m T}$分布与爆轰波（Blast-Wave）模型的理论预期进行对比。描述较轻强子产生的模型参数，同样可对高多重数p-Pb碰撞中的超子能谱进行拟合。本研究同时分析了超子相对于带电π介子的产额比值，并与pp碰撞及Pb-Pb碰撞的相关结果进行了对比。本研究采用一套统计模型，该模型通过正则抑制（canonical suppression）机制描述产额比值随碰撞系统体积的变化规律：较小的碰撞体积会导致强子产生出现依赖于粒子种类的相对压低效应。计算结果表明，该效应的强度依赖于粒子的奇异数含量，且与实验数据在定性上吻合良好。