Multiplicity and transverse momentum fluctuations in inelastic proton–proton interactions at the CERN Super Proton Synchrotron

Multiplicity and transverse momentum fluctuations in inelastic proton–proton interactions at the CERN Super Proton Synchrotron
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CERN 超级质子同步加速器非弹性质子-质子相互作用的多重性和横向动量波动

DOI:
10.1140/epjc/s10052-016-4450-9
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发表时间:
2016
期刊:
The European Physical Journal C
影响因子:
--
通讯作者:
SHINE Collaboration]
SHINE Collaboration]
中科院分区:
--
文献类型:
--
作者:
A. Aduszkiewicz [NA61;SHINE Collaboration]

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在非弹性p + p相互作用中,在20,31,40,80和158束流动量下测量了带电粒子的多重数和横向动量涨落。多重数分布的标度方差和多重数和横向动量起伏的三个强烈的密集措施的结果,并提出。这是第一次,波动的结果完全校正了实验偏差。多重数和横向动量涨落的结果显着偏离独立粒子产生的预期。它们也依赖于所选强子的电荷。弦共振蒙特卡罗模型Epos和Urqmd没有描述这些数据。非弹性p + p相互作用中多重数涨落的标度方差明显高于NA 49在相同能量下测量的中心Pb + Pb碰撞中的多重数涨落。这与受伤核子模型的预测在质上是不一致的。在统计框架内,增强的多重性波动在非弹性p + p相互作用可以解释为由于事件的火球能量和/或体积的波动。
Measurements of multiplicity and transverse momentum fluctuations of charged particles were performed in inelastic p+p interactions at 20, 31, 40, 80, and 158beam momentum. Results for the scaled variance of the multiplicity distribution and for three strongly intensive measures of multiplicity and transverse momentum fluctuations,andare presented. For the first time the results on fluctuations are fully corrected for experimental biases. The results on multiplicity and transverse momentum fluctuations significantly deviate from expectations for the independent particle production. They also depend on charges of selected hadrons. The string-resonance Monte Carlo modelsEposandUrqmddo not describe the data. The scaled variance of multiplicity fluctuations is significantly higher in inelastic p+p interactions than in central Pb+Pb collisions measured by NA49 at the same energy per nucleon. This is in qualitative disagreement with the predictions of the Wounded Nucleon Model. Within the statistical framework the enhanced multiplicity fluctuations in inelastic p+p interactions can be interpreted as due to event-by-event fluctuations of the fireball energy and/or volume.
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