In peripheral collisions at LHC, part of the large angular momentum of the colliding ions could be collectively transferred to the midrapidity interaction region giving rise to a spinning quark gluon plasma fireball. If the intrinsic angular momentum of the QGP fireball is large enough, there will be remarkable effects on several observables such as elliptic flow, transverse momentum spectra and hadron multiplicities. By taking advantage of a recent full calculation of the microcanonical and canonical ensembles of ideal relativistic quantum gases at fixed intrinsic angular momentum, we give quantitative predictions of those observables at LHC. In a statistically equilibrated spinning fireball, the predicted azimuthal momentum anisotropy is very similar to that generated by the pressure gradients in usual hydrodynamical approach; transverse momentum spectra are broadened; the chemical freeze-out temperatures determined by means of hadronic abundances could decrease with respect to central collisions. However, the most peculiar feature is an azimuthal anisotropic net polarization of produced hadrons, for which we provide quantitative predictions and momentum dependence.
The effects of angular momentum conservation in relativistic heavy ion collisions at the LHC / F. Becattini; F. Piccinini. - In: JOURNAL OF PHYSICS. G, NUCLEAR AND PARTICLE PHYSICS. - ISSN 0954-3899. - STAMPA. - G35:(2008), pp. 054001-168-054001-170. [10.1088/0954-3899/35/5/054001]
The effects of angular momentum conservation in relativistic heavy ion collisions at the LHC
BECATTINI, FRANCESCO
Methodology
;
2008
Abstract
In peripheral collisions at LHC, part of the large angular momentum of the colliding ions could be collectively transferred to the midrapidity interaction region giving rise to a spinning quark gluon plasma fireball. If the intrinsic angular momentum of the QGP fireball is large enough, there will be remarkable effects on several observables such as elliptic flow, transverse momentum spectra and hadron multiplicities. By taking advantage of a recent full calculation of the microcanonical and canonical ensembles of ideal relativistic quantum gases at fixed intrinsic angular momentum, we give quantitative predictions of those observables at LHC. In a statistically equilibrated spinning fireball, the predicted azimuthal momentum anisotropy is very similar to that generated by the pressure gradients in usual hydrodynamical approach; transverse momentum spectra are broadened; the chemical freeze-out temperatures determined by means of hadronic abundances could decrease with respect to central collisions. However, the most peculiar feature is an azimuthal anisotropic net polarization of produced hadrons, for which we provide quantitative predictions and momentum dependence.File | Dimensione | Formato | |
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