Effect of secondary protons on baryon and proton number cumulants in event-by-event analysis

被引：6

作者：

Ono, Hirosato ^{[1
]}

Asakawa, Masayuki ^{[1
]}

Kitazawa, Masakiyo ^{[1
]}

机构：

[1] Osaka Univ, Dept Phys, Toyonaka, Osaka 5600043, Japan

来源：

PHYSICAL REVIEW C | 2013年 / 87卷 / 04期

关键词：

HEAVY-ION COLLISIONS; FREEZE-OUT; FLUCTUATIONS;

D O I：

10.1103/PhysRevC.87.041901

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We investigate the effects of secondary (knockout) protons, which constitute about 20% of the observed protons at the solenoidal tracker detector (STAR) at the BNL Relativistic Heavy Ion Collider, on the higher order cumulants of proton and baryon numbers measured by event-by-event analyses in relativistic heavy-ion collisions. We argue that the contribution of this background effect on the cumulants is expressed by a simple formula and that hence their effects can be removed in the experimental analysis. It is discussed that this background effect has a non-negligible contribution to recently observed proton number cumulants at STAR, especially the third-order one, and that the removal of this effect is crucial to investigate the thermodynamical properties of the primordial hot medium appropriately. DOI: 10.1103/PhysRevC.87.041901

引用

页数：4

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