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arXiv 1704.04737hep-ex
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pp与ALICE碰撞中确定粒子产生的多重数依赖性

Multiplicity dependence of identified particle production in pp collisions with ALICE

Vytautas Vislavicius

摘要:

在不同质心能量($\sqrt{s}$)的质子-质子(pp)碰撞中,作为横动量($p_{\text{T}}$)和事件多重性函数的确定粒子产生的研究是理解小碰撞和大碰撞系统之间的相似性和差异性的关键工具。我们报告的生产$π^{\pm}$,$K^{\pm}$,$K^{0}_{S}$,$p (\bar{p})$,$Λ(\barΛ)$,$Ξ^{\pm}$和$Ω^{\pm}$测量pp碰撞在一个广泛的质心能量与ALICE。确定的粒子产量的多重性依赖于$\sqrt{s} = \textrm{7}$和$13$ TeV和质子铅(p-Pb)和铅铅(Pb-Pb)碰撞中获得的结果的背景下进行了讨论,揭示显着的和有趣的相似之处。我们观察到奇异强子的产生率比非奇异粒子的产生率增加得多,并呈现出多重性增强的图象,多重性与碰撞能量无关。即使谱形状的多重性依赖性可以用常用的蒙特卡罗(MC)事件发生器定性描述,这些模型对综合产率的演变描述得很差。

英文摘要:

The study of identified particle production as a function of transverse momentum ($p_{\text{T}}$) and event multiplicity in proton-proton (pp) collisions at different center-of-mass energies ($\sqrt{s}$) is a key tool for understanding similarities and differences between small and large collisions systems. We report on the production of $π^{\pm}$, $K^{\pm}$, $K^{0}_{S}$, $p (\bar{p})$, $Λ(\barΛ)$, $Ξ^{\pm}$ and $Ω^{\pm}$ measured in pp collisions in a wide range of center-of-mass energies with ALICE. The multiplicity dependence of identified particle yields is presented for $\sqrt{s} = \textrm{7}$ and $13$ TeV and discussed in the context of the results obtained in proton-lead (p-Pb) and lead-lead (Pb-Pb) collisions, unveiling remarkable and intriguing similarities. The production rates of strange hadrons are observed to increase more than those of non-strange particles, showing an enhancement pattern with multiplicity which does not depend on the collision energy. Even if the multiplicity dependence of spectral shapes can be qualitatively described by commonly-used Monte Carlo (MC) event generators, the evolution of integrated yield ratios is poorly described by these models.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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