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arXiv · 1312.4230

Onset of radial flow in p+p collisions

Kun Jiang·Yinying Zhu·Weitao Liu·Hongfang Chen·Cheng Li·Lijuan Ruan·Ming Shao·Zebo Tang·Zhangbu Xu
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Abstract

It has been debated for decades whether hadrons emerging from p+p collisions exhibit collective expansion. The signal of the collective motion in p+p collisions is not as clear/clean as in heavy-ion collisions because of the low multiplicity and large fluctuation in p+p collisions. Tsallis Blast-Wave (TBW) model is a thermodynamic approach, introduced to handle the overwhelming correlation and fluctuation in the hadronic processes. We have systematically studied the identified particle spectra in p+p collisions from RHIC to LHC using TBW and found no appreciable radial flow in p+p collisions below $\sqrt{s}=900$ GeV. At LHC higher energy of 7 TeV in p+p collisions, the radial flow velocity achieves an average value of $<\beta >= 0.320\pm0.005$. This flow velocity is comparable to that in peripheral (40-60%) Au+Au collisions at RHIC. Breaking of the identified particle spectra $m_T$ scaling was also observed at LHC from a model independent test.

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Kun Jiang, Yinying Zhu, Weitao Liu, Hongfang Chen, Cheng Li, Lijuan Ruan, Ming Shao, Zebo Tang, Zhangbu Xu. 2013-12-16. Onset of radial flow in p+p collisions. https://arxiv.org/abs/1312.4230

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