Controlling volume fluctuations for studies of critical phenomena in nuclear collisions

IF 1.7 4区 物理与天体物理 Q2 PHYSICS, NUCLEAR
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引用次数: 0

Abstract

We generalize and extend the recently proposed method [1] to account for contributions of system size (or volume/participant) fluctuations to the experimentally measured moments of particle multiplicity distributions. We find that in the general case there are additional biases which are not directly accessible to experiment. These biases are, however, parametrically suppressed if the multiplicity of the particles of interest is small compared to the total charged-particle multiplicity, e.g., in the case of proton number fluctuations at top RHIC and LHC energies. They are also small if the multiplicity distribution of charged particles per wounded nucleon is close to the Poissonian limit, which is the case at low energy nuclear collisions, e.g., at GSI/SIS18. We further find that mixed events are not necessarily needed to extract the correction for volume fluctuations. We provide the formulas to correct pure and mixed cumulants of particle multiplicity distributions up to any order together with their associated biases.

控制核碰撞临界现象研究中的体积波动
我们对最近提出的方法[1]进行了概括和扩展,以考虑系统尺寸(或体积/参与者)波动对实验测量的粒子倍率分布矩的贡献。我们发现,在一般情况下,还存在实验无法直接获得的额外偏差。然而,如果相关粒子的倍率与带电粒子的总倍率相比很小,这些偏差就会被参数化地抑制,例如在 RHIC 和 LHC 顶级能量的质子数波动中。如果每个受伤核子的带电粒子倍率分布接近泊松极限,它们的倍率也会很小,在低能核碰撞中,例如在 GSI/SIS18 就是这种情况。我们进一步发现,提取体积波动修正并不一定需要混合事件。我们提供了修正粒子倍率分布的纯累积和混合累积的公式,可达到任意阶,并提供了相关偏差。
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来源期刊
Nuclear Physics A
Nuclear Physics A 物理-物理:核物理
CiteScore
3.60
自引率
7.10%
发文量
113
审稿时长
61 days
期刊介绍: Nuclear Physics A focuses on the domain of nuclear and hadronic physics and includes the following subsections: Nuclear Structure and Dynamics; Intermediate and High Energy Heavy Ion Physics; Hadronic Physics; Electromagnetic and Weak Interactions; Nuclear Astrophysics. The emphasis is on original research papers. A number of carefully selected and reviewed conference proceedings are published as an integral part of the journal.
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