arXiv 0907.15092009-07-09nucl-ex

ALICE pp物理课程

ALICE pp physics programme

Ingrid Kraus

备注：: 7 pages, 5 figures, proceedings of XLVII International Winter Meeting on Nuclear Physics, Bormio (Italy)

摘要：

欧洲核子研究中心大型强子对撞机ALICE实验的物理方案除了研究高能重离子碰撞外，还包括测量前所未有的能量下的质子-质子相互作用。本文着重讨论了用带电强子多重数分布和平均横动量来描述全局事件的性质。这些散装可观的成为访问，因为探测器具有良好的轨道重建，特别是在低横动量。奇异强子的测量是特别感兴趣的，因为奇异粒子相空间被发现在较低的质心能量下被抑制在正则约化之外，并且软粒子的产生机制尚未完全理解。在这里，我们特别受益于粒子识别到非常低的横向动量，即100 - 300 MeV/c，获得光谱和识别强子的综合产额。配备了这些功能，ALICE将发挥互补作用，w.r.t.其他LHC实验pp碰撞的软部分最近引起了新的兴趣，从理论和实验两个方面都期望对潜在事件的物理学有新的见解。

英文摘要：

The physics programme of the ALICE experiment at CERN-LHC comprises besides studies of high-energy heavy-ion collisions measurements of proton-proton interactions at unprecedented energies, too. This paper focuses on the global event characterisation in terms of the multiplicity distribution of charged hadrons and mean transverse momentum. These bulk observables become accessible because the detector features excellent track reconstruction, especially at low transverse momenta. The measurement of strange hadrons is of particular interest since the strange-particle phase-space was found to be suppressed beyond canonical reduction at lower center-of-mass energies and the production mechanism of soft particles is not yet fully understood. Here we benefit in particular from particle identification down to very low transverse momentum, i.e. 100 - 300 MeV/c, giving access to spectra and integrated yields of identified hadrons. Equipped with these features, ALICE will play a complementary role w.r.t. other LHC experiments. New interest in the soft part of pp collisions arose recently and new insights in the physics of the underlying event are expected from both, theory and experiment.

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