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arXiv 1301.1644nucl-ex
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在ALICE实验中Pb-Pb碰撞的强子共振产生

Hadronic resonance production in Pb-Pb collisions at the ALICE experiment

A. G. Knospe

摘要:

测量高能重离子碰撞中强子共振(相对于非共振)的产额,可以研究碰撞系统的化学冻结温度和化学冻结与热冻结之间的时间,而共振质量和宽度的修改可能是手征对称性恢复的标志。利用ALICE探测器测量了2.76TeV的Pb-Pb碰撞中phi(1020)介子的能谱(pT <5GeV/c)、总积分产额、非共振比(phi/pi和phi/K)、质量和宽度,以及K~*(892)0和反K~*(892)0介子的未校正产额、质量和宽度。这些测量结果将与其他碰撞系统和能量的结果进行比较。在Pb-Pb和pp碰撞中测量了主导触发强子和phi(1020)介子之间的角关联,给出了phi(1020)介子的质量和宽度随关联角的变化。

英文摘要:

Measurements of the yields of hadronic resonances (relative to non-resonances) in high-energy heavy-ion collisions allow the chemical freeze-out temperature and the time between chemical and thermal freeze-out of the collision system to be studied, while modifications to resonance masses and widths could be a signature of chiral symmetry restoration. The spectra (for pT < 5 GeV/c), total integrated yields, ratios to non-resonances (phi/pi and phi/K), mass, and width of the phi(1020) meson and the uncorrected yields, mass, and width of the K*(892)0 and anti-K*(892)0 mesons have been measured using the ALICE detector for Pb-Pb collisions at 2.76 TeV. These measurements will be compared to results from other collision systems and energies. Angular correlations between leading trigger hadrons and phi(1020) mesons have been measured in Pb-Pb and pp collisions; the mass and width of the phi(1020) meson as a function of the correlation angle will be presented.

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