Angular momentum conservation in heavy ion collisions at very high energy
By F. Becattini, F. Piccinini, J. Rizzo. 2007
263 citations recorded by the source corpus.
The effects of angular momentum conservation in peripheral heavy ion collisions at very high energy are investigated. It is shown that the initial angular momentum of the quark-gluon plasma should enhance the azimuthal anisotropy of particle spectra (elliptic flow) with respect to the usual picture where only the initial geometrical eccentricity of the nuclear overlap region is responsible for the anisotropy. In hydrodynamical terms, the initial angular momentum entails a nontrivial dependence of the initial longitudinal flow velocity on the transverse coordinates. This gives rise to a nonvanishing vorticity in the equations of motion, which enhances the expansion rate of the supposedly created fluid compensating for the possible quenching effect of viscosity. A distinctive signature of the vorticity in the plasma is the generation of an average polarization of the emitted hadrons, for which we provide analytical expressions. These phenomena might be better observed at LHC, where the initial angular momentum density will be larger and where we envisage an increase of the elliptic flow coefficient v{sub 2} with respect to RHIC energies.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/9ec59f81995f845cb666d0ca230b6ebd83a79ab1
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Citations in the corpus
- Global Λ hyperon polarization in nuclear collisions (2017, unknown): “The subscripts Λ′ and Λ ′ in equation (3) indicate that these polarizations are for ‘primary’ hyperons emitted directly from”
- Relativistic dissipative spin dynamics in the relaxation time approximation (2020, background): “While the global spin polarization of the Λ (and Λ̄) hyperons can be explained by the assumption that the spin polarization is directly expressed by the so-called thermal vorticity [7, 8, 9, 10, 11, 12], other features of the data lack convincing theoretical explanations [13, 14].”
- Mapping the phases of quantum chromodynamics with beam energy scan (2019, background): “Furthermore the nonzero global angular momentum and average vorticity would also imply a preference of their spins to be aligned along the same direction due to the spin-orbital coupling [173, 174, 178–184].”
- Global polarization of $\Lambda$ hyperons in Au+Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV (2018, unknown): “Several theoretical models suggest that the large angular momentum carried by two colliding nuclei [10, 11] can be transferred to the created system.”