Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Size of the emission source and collectivity in ultra-relativistic p-Pb
  collisions   The interferometric radii in the system formed in ultra-relativistic
proton-lead collisions are investigated in a framework based on event-by-event
3+1 dimensional viscous hydrodynamics. We argue that the most central p-Pb
collisions undergoing collective expansion behave similarly to the peripheral
nucleus-nucleus collisions. The interferometric observables can serve as
signatures of the formation of an extended fireball.

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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
16
The categories of this paper are: stat
1
The categories of this paper are: cs
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The categories of this paper are: ao-sci
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The categories of this paper are: eess
5
The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin