Onset of radial flow in p+p collisions

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 $<\beta >=0.320\pm 0.005$. 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.

6 pages, 3 figures, add nearly 300 data points from ALICE experiment by their request.Rephrased a little bit. Results and conclusions remain the same

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Cited by in corpus (5)

• ${\pi }^0$ and $\eta$ meson production in proton-proton collisions at $\sqrt{s}=8$ TeV
• Excitation Functions of Tsallis-like Parameters in High-Energy Nucleus-Nucleus Collisions
• Study of Dependence of Kinetic Freezeout Temperature on the Production Cross Section of Particles in Various Centrality Intervals in Au Au and Pb Pb Collisions at High Energies
• A correlated-cluster model and the ridge phenomenon in hadron-hadron collisions
• Evidence of Collective Flow in p-p Collision at LHC