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Initial state fluctuations in collisions between light and heavy ions
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abstract
In high energy collisions involving small nuclei (p+p or x+Au collisions where x=p, d, or $^3$He) the fluctuating size, shape and internal gluonic structure of the nucleon is shown to have a strong effect on the initial size and shape of the fireball of new matter created in the collision. A systematic study of the eccentricity coefficients describing this initial fireball state for several semi-realistic models of nucleon substructure and for several practically relevant collision systems involving small nuclei is presented. The key importance of multiplicity fluctuations in such systems is pointed out. Our results show large differences from expectations based on conventional Glauber model simulations of the initial state created in such collisions.
Forward citations
Cited by 4 Pith papers
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Nonflow Subtraction Beyond Two-Particle Correlations
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In AMPT simulations of 200 GeV Au+Au and O+O collisions, nucleon size smears deformation probes, but scaled v2 and scaled rho2 remain robust for deformation in heavy systems, while delta-pT fluctuation is a cleaner nu...
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Wounded parton scaling of multiplicities in ultra-relativistic light- and heavy-ion collisions
With four partons per nucleon and one shared entropy-to-multiplicity scale, a wounded-parton Glauber model with negative-binomial fluctuations fits O+O, Ne+Ne, Xe+Xe, and Pb+Pb multiplicity distributions from 1–80% ce...
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A comparison study of collisions at relativistic energies involving light nuclei
The elliptic-to-triangular flow ratio near target rapidity in lead-light nucleus collisions is the most sensitive model-level probe of light-nucleus deformation.
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