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arXiv 1606.07424nucl-exhep-ex
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高多重数质子-质子碰撞中多奇异强子的增强产生

Enhanced production of multi-strange hadrons in high-multiplicity proton-proton collisions

ALICE Collaboration

摘要:

在足够高的温度和能量密度下,核物质会经历一个转变,进入一个夸克和胶子不受限制的阶段:夸克-胶子等离子体(QGP)[1]。这种强相互作用QCD(量子色动学)物质的极端状态是在实验室中通过重核的高能碰撞产生的,在那里观察到奇异强子的增强产生[2-6]。奇异性增强最初被认为是核碰撞中QGP形成的标志[7],对于多奇异重子来说更为明显。在高多重质子-质子(pp)碰撞中观察到了重离子现象学的几种典型效应[8,9]。然而,迄今为止还没有报道多奇异粒子的增强产生。在这里,我们提出了在高多重pp碰撞奇异增强的第一个观察。我们发现奇异粒子和多奇异粒子相对于π介子的积分产额随事件带电粒子多重数的增加而显著增加。测量结果与p-Pb碰撞结果[10,11]非常一致,表明该现象与碰撞中产生的最终系统有关。在高多重事件的奇异性生产达到类似的Pb-Pb碰撞中观察到的值,其中QGP的形成。

英文摘要:

At sufficiently high temperature and energy density, nuclear matter undergoes a transition to a phase in which quarks and gluons are not confined: the Quark-Gluon Plasma (QGP) [1]. Such an extreme state of strongly-interacting QCD (Quantum Chromo-Dynamics) matter is produced in the laboratory with high-energy collisions of heavy nuclei, where an enhanced production of strange hadrons is observed [2-6]. Strangeness enhancement, originally proposed as a signature of QGP formation in nuclear collisions [7], is more pronounced for multi-strange baryons. Several effects typical of heavy-ion phenomenology have been observed in high-multiplicity proton-proton (pp) collisions [8,9]. Yet, enhanced production of multi-strange particles has not been reported so far. Here we present the first observation of strangeness enhancement in high-multiplicity pp collisions. We find that the integrated yields of strange and multi-strange particles relative to pions increases significantly with the event charged-particle multiplicity. The measurements are in remarkable agreement with p-Pb collision results [10,11] indicating that the phenomenon is related to the final system created in the collision. In high-multiplicity events strangeness production reaches values similar to those observed in Pb-Pb collisions, where a QGP is formed.

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